[Gradle Release Plugin] - new version commit: '0.2.0-SNAPSHOT'.

.dockerignore

@@ -0,0 +1,50 @@
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### Git ###
+.git
+.gitignore
+
+### Docker ###
+.dockerignore
+Dockerfile
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

Dockerfile

@@ -0,0 +1,33 @@
+FROM eclipse-temurin:21-jdk-alpine AS build
+
+WORKDIR /root/app
+
+# Download Gradle
+COPY ./gradle ./gradle
+COPY ./gradlew ./
+RUN ./gradlew --no-daemon --info --stacktrace
+
+# Download Dependencies
+COPY ./buildSrc ./buildSrc
+COPY ./settings.gradle.kts ./
+COPY ./bot-api/build.gradle.kts ./bot-api/
+COPY ./bot-database/build.gradle.kts ./bot-database/
+COPY ./management/build.gradle.kts ./management/
+COPY ./server/build.gradle.kts ./server/
+COPY ./bots/ping-bot/build.gradle.kts ./bots/ping-bot/
+COPY ./bots/pizza-bot/build.gradle.kts ./bots/pizza-bot/
+RUN ./gradlew deps --no-daemon --info --stacktrace
+
+# Build Application
+COPY . .
+RUN ./gradlew build :server:jlink --no-daemon --info --stacktrace
+
+FROM alpine:3.19.1
+
+WORKDIR /opt/chat/
+COPY --from=build /root/app/server/build/dist/jre /opt/chat/
+
+ENV JAVA_HOME="/opt/chat"
+ENV JAVA_OPTS="--enable-preview"
+ENV CHAT_BOT_CONFIG="file:/etc/chat/config.json"
+ENTRYPOINT $JAVA_HOME/bin/java $JAVA_OPTS --module eu.jonahbauer.chat.server

bot-api/build.gradle.kts

@@ -1,10 +1,10 @@
 plugins {
     id("java-library")
+    id("java-test-fixtures")
     id("chat-bot.java-conventions")
 }
 
 group = "eu.jonahbauer.chat"
-version = "0.1.0-SNAPSHOT"
 
 sourceSets {
     create("config") {
@@ -20,21 +20,21 @@ java {
     }
 }
 
-val configApi by configurations
 val configCompileOnly by configurations
+val configCompileOnlyApi by configurations
 val configAnnotationProcessor by configurations
 
 dependencies {
-    api(libs.annotations)
+    compileOnlyApi(libs.annotations)
     api(project(path)) {
         capabilities {
             requireCapability("${project.group}:${project.name}-config")
         }
     }
-    implementation(libs.jackson.annotations)
+    implementation(libs.gson)
 
-    configApi(libs.annotations)
     configCompileOnly(libs.lombok)
+    configCompileOnlyApi(libs.annotations)
     configAnnotationProcessor(libs.lombok)
 }
 

bot-api/src/main/java/eu/jonahbauer/chat/bot/api/Message.java

@@ -1,25 +1,12 @@
 package eu.jonahbauer.chat.bot.api;
 
-import com.fasterxml.jackson.annotation.JsonFormat;
+import com.google.gson.annotations.SerializedName;
-import com.fasterxml.jackson.annotation.JsonProperty;
-import com.fasterxml.jackson.annotation.JsonSubTypes;
-import com.fasterxml.jackson.annotation.JsonTypeInfo;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import java.time.LocalDateTime;
 
 
-@JsonTypeInfo(
-        use = JsonTypeInfo.Id.NAME,
-        property = "type"
-)
-@JsonSubTypes({
-        @JsonSubTypes.Type(value = Message.Ping.class, name = "ping"),
-        @JsonSubTypes.Type(value = Message.Pong.class, name = "pong"),
-        @JsonSubTypes.Type(value = Message.Ack.class, name = "ack"),
-        @JsonSubTypes.Type(value = Message.Post.class, name = "post")
-})
 public sealed interface Message {
     Ping PING = new Ping();
 
@@ -34,12 +21,11 @@ public sealed interface Message {
             @NotNull String name,
             @NotNull String message,
             @NotNull String channel,
-            @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd HH:mm:ss")
             @NotNull LocalDateTime date,
             @Nullable Long delay,
-            @JsonProperty("user_id")
+            @SerializedName("user_id")
             @Nullable Long userId,
-            @JsonProperty("username")
+            @SerializedName("username")
             @Nullable String userName,
             @NotNull String color,
             int bottag

bot-api/src/main/java/module-info.java

@@ -2,12 +2,12 @@ import eu.jonahbauer.chat.bot.api.ChatBot;
 
 module eu.jonahbauer.chat.bot.api {
     exports eu.jonahbauer.chat.bot.api;
-    exports eu.jonahbauer.chat.bot.impl to eu.jonahbauer.chat.server;
+    exports eu.jonahbauer.chat.bot.impl to eu.jonahbauer.chat.server, eu.jonahbauer.chat.bot.api.fixtures;
 
     requires transitive eu.jonahbauer.chat.bot.config;
     requires static transitive org.jetbrains.annotations;
 
-    requires static com.fasterxml.jackson.annotation;
+    requires static com.google.gson;
     requires static lombok;
 
     uses ChatBot;

bot-api/src/testFixtures/java/eu/jonahbauer/chat/bot/test/ChatBotFactoryAccess.java

@@ -0,0 +1,21 @@
+package eu.jonahbauer.chat.bot.test;
+
+import eu.jonahbauer.chat.bot.api.ChatBot;
+import eu.jonahbauer.chat.bot.config.BotConfig;
+import eu.jonahbauer.chat.bot.impl.ChatBotFactory;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.function.Supplier;
+
+public final class ChatBotFactoryAccess {
+
+    private ChatBotFactoryAccess() {}
+
+    public static <T extends ChatBot> T create(@NotNull BotConfig config, @NotNull Supplier<T> supplier) {
+        return ScopedValue.where(ChatBotFactory.BOT_CONFIG, config).get(supplier);
+    }
+
+    public static <T extends ChatBot> T create(@NotNull Supplier<T> supplier) {
+        return create(BotConfig.EMPTY, supplier);
+    }
+}

bot-api/src/testFixtures/java/eu/jonahbauer/chat/bot/test/MockChat.java

@@ -0,0 +1,27 @@
+package eu.jonahbauer.chat.bot.test;
+
+import eu.jonahbauer.chat.bot.api.Chat;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class MockChat implements Chat {
+    private final @NotNull List<@NotNull Message> messages = new ArrayList<>();
+
+    @Override
+    public boolean send(@NotNull String channel, @NotNull String name, @NotNull String message, boolean bottag, boolean publicId) {
+        messages.add(new Message(channel, name, message, bottag, publicId));
+        return true;
+    }
+
+    public @NotNull List<@NotNull Message> getMessages() {
+        return messages;
+    }
+
+    public record Message(@NotNull String channel, @NotNull String name, @NotNull String message, boolean bottag, boolean publicId) {
+        public Message(@NotNull String channel, @NotNull String name, @NotNull String message) {
+            this(channel, name, message, true, true);
+        }
+    }
+}

bot-api/src/testFixtures/java/module-info.java

@@ -0,0 +1,7 @@
+module eu.jonahbauer.chat.bot.api.fixtures {
+    exports eu.jonahbauer.chat.bot.test;
+
+    requires eu.jonahbauer.chat.bot.api;
+    requires eu.jonahbauer.chat.bot.config;
+    requires static transitive org.jetbrains.annotations;
+}

bot-database/build.gradle.kts

@@ -0,0 +1,13 @@
+plugins {
+    id("java-library")
+    id("chat-bot.java-conventions")
+}
+
+group = "eu.jonahbauer.chat"
+
+dependencies {
+    compileOnlyApi(libs.annotations)
+    implementation(libs.sqlite)
+    implementation(libs.hikari)
+    implementation(libs.slf4j)
+}

bot-database/src/main/java/eu/jonahbauer/chat/bot/database/BindException.java

@@ -0,0 +1,9 @@
+package eu.jonahbauer.chat.bot.database;
+
+import lombok.experimental.StandardException;
+
+import java.sql.SQLException;
+
+@StandardException
+public class BindException extends SQLException {
+}

bot-database/src/main/java/eu/jonahbauer/chat/bot/database/Database.java

@@ -0,0 +1,310 @@
+package eu.jonahbauer.chat.bot.database;
+
+import com.zaxxer.hikari.HikariConfig;
+import com.zaxxer.hikari.HikariDataSource;
+import eu.jonahbauer.chat.bot.database.impl.Binder;
+import eu.jonahbauer.chat.bot.database.impl.Helper;
+import eu.jonahbauer.chat.bot.database.impl.Inserter;
+import eu.jonahbauer.chat.bot.database.impl.Updater;
+import eu.jonahbauer.chat.bot.database.impl.types.TypeAdapter;
+import lombok.Lombok;
+import lombok.SneakyThrows;
+import org.intellij.lang.annotations.Language;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Optional;
+
+@SuppressWarnings({"SqlSourceToSinkFlow", "unused"})
+public class Database implements AutoCloseable {
+    private static final ScopedValue<Connection> CONNECTION = ScopedValue.newInstance();
+    private final @NotNull HikariDataSource ds;
+
+    public Database(@NotNull String url) {
+        this(url, null, null);
+    }
+
+    public Database(@NotNull String url, @Nullable String user, @Nullable String password) {
+        var hikariConfig = new HikariConfig();
+        hikariConfig.setJdbcUrl(url);
+        hikariConfig.setUsername(user);
+        hikariConfig.setPassword(password);
+        hikariConfig.addDataSourceProperty("enforceForeignKeys", true);
+        this.ds = new HikariDataSource(hikariConfig);
+    }
+
+
+    @SuppressWarnings("RedundantThrows")
+    public <T extends Throwable> void transaction(@NotNull ThrowingRunnable<T> runnable) throws SQLException, T {
+        if (CONNECTION.isBound()) throw new IllegalStateException("nested transactions are not supported");
+
+        try (var connection = getConnection0()) {
+            connection.setAutoCommit(false);
+            try {
+                ScopedValue.runWhere(CONNECTION, connection, () -> {
+                    try {
+                        runnable.run();
+                    } catch (Throwable t) {
+                        throw Lombok.sneakyThrow(t);
+                    }
+                });
+                connection.commit();
+            } catch (Throwable t) {
+                connection.rollback();
+                throw t;
+            }
+        }
+    }
+
+    @SuppressWarnings("RedundantThrows")
+    public <R, T extends Throwable> R transaction(@NotNull ThrowingCallable<R, T> callable) throws SQLException, T {
+        if (CONNECTION.isBound()) throw new IllegalStateException("nested transactions are not supported");
+
+        try (var connection = getConnection0()) {
+            connection.setAutoCommit(false);
+            try {
+                var result = ScopedValue.callWhere(CONNECTION, connection, () -> {
+                    try {
+                        return callable.call();
+                    } catch (Throwable t) {
+                        throw Lombok.sneakyThrow(t);
+                    }
+                });
+                connection.commit();
+                return result;
+            } catch (Throwable t) {
+                connection.rollback();
+                throw Lombok.sneakyThrow(t);
+            }
+        }
+    }
+
+    public <T extends Record> @NotNull List<T> findAll(@NotNull Class<T> type) throws SQLException {
+        return executeQuery(type, "SELECT * FROM " + Helper.getQuotedTableName(type));
+    }
+
+    public <T extends Record & Entity<T>> @NotNull Optional<T> findById(@NotNull Class<T> type, long id) throws SQLException {
+        return findWhere(type, "id", id);
+    }
+
+    @SuppressWarnings("Convert2MethodRef")
+    public <T extends Record> @NotNull List<T> findAllWhere(@NotNull Class<T> type, @NotNull String component, Object value) throws SQLException {
+        return findWhere0(type, component, value, (t, query, customizer) -> executeQuery(t, query, customizer));
+    }
+
+    @SuppressWarnings("Convert2MethodRef")
+    public <T extends Record> @NotNull Optional<T> findWhere(@NotNull Class<T> type, @NotNull String component, Object value) throws SQLException {
+        return findWhere0(type, component, value, (t, query, customizer) -> executeUniqueQuery(t, query, customizer));
+    }
+
+    @SneakyThrows(NoSuchMethodException.class)
+    private <T extends Record, R> R findWhere0(@NotNull Class<T> type, @NotNull String component, Object value, @NotNull FindWhere<T, R> finder) throws SQLException {
+        var table = Helper.getQuotedTableName(type);
+        var column = Helper.getColumnName(type, component);
+        var componentType = type.getMethod(component).getReturnType();
+        var adapter = TypeAdapter.get(componentType);
+        return finder.find(
+                type,
+                "SELECT * FROM " + table + " WHERE " + column + " " + (value == null ? "IS NULL" : "= ?"),
+                stmt -> {
+                    if (value != null) adapter.prepareUnsafe(stmt, 1, value);
+                }
+        );
+    }
+
+    private interface FindWhere<T extends Record, R> {
+        R find(@NotNull Class<T> type, @Language("SQL") @NotNull String query, @NotNull ThrowingConsumer<PreparedStatement, SQLException> customizer) throws SQLException;
+    }
+
+    public <T extends Record> @NotNull List<T> bindAll(@NotNull Class<T> type, @NotNull ResultSet result) throws SQLException {
+        return bindAll(type, result, "");
+    }
+
+    public <T extends Record> @NotNull List<T> bindAll(@NotNull Class<T> type, @NotNull ResultSet result, @NotNull String prefix) throws SQLException {
+        var out = new ArrayList<T>();
+        var binder = Binder.get(type);
+        while (result.next()) {
+            out.add(binder.bind(result, prefix));
+        }
+        return Collections.unmodifiableList(out);
+    }
+
+    public <T extends Record> @NotNull Optional<T> bind(@NotNull Class<T> type, @NotNull ResultSet result) throws SQLException {
+        return bind(type, result, "");
+    }
+
+    public <T extends Record> @NotNull Optional<T> bind(@NotNull Class<T> type, @NotNull ResultSet result, @NotNull String prefix) throws SQLException {
+        if (result.next()) {
+            var binder = Binder.get(type);
+            var out = Optional.of(binder.bind(result, prefix));
+            if (result.next()) throw new NonUniqueResultException();
+            return out;
+        } else {
+            return Optional.empty();
+        }
+    }
+
+    @SuppressWarnings("unchecked")
+    public <T extends Record & Entity<T>> boolean delete(@NotNull T entity) throws SQLException {
+        return delete((Class<T>) entity.getClass(), entity.id());
+    }
+
+    public <T extends Record & Entity<T>> boolean delete(@NotNull Class<T> type, long id) throws SQLException {
+        return 1 == executeUpdate("DELETE FROM " + Helper.getQuotedTableName(type) + " WHERE id = ?", stmt -> stmt.setLong(1, id));
+    }
+
+    public long insert(@NotNull Record record) throws SQLException {
+        return insert0(record);
+    }
+
+    private <T extends Record> long insert0(@NotNull T record) throws SQLException {
+        @SuppressWarnings("unchecked")
+        var type = (Class<T>) record.getClass();
+        var connection = getConnection0();
+        try {
+            return Inserter.get(type).insert(connection, record);
+        } finally {
+            close(connection);
+        }
+    }
+
+    public <T extends Record> T save(@NotNull T record) throws SQLException {
+        @SuppressWarnings("unchecked")
+        var type = (Class<T>) record.getClass();
+        var connection = getConnection0();
+        try {
+            var id = Inserter.get(type).insert(connection, record);
+            if (record instanceof Entity<?> entity) {
+                return (T) entity.withId(id);
+            } else {
+                return record;
+            }
+        } finally {
+            close(connection);
+        }
+    }
+
+    public <T extends Record & Entity<T>> boolean update(@NotNull T entity) throws SQLException {
+        @SuppressWarnings("unchecked")
+        var type = (Class<T>) entity.getClass();
+        var connection = getConnection0();
+        try {
+            return Updater.get(type).update(connection, entity);
+        } finally {
+            close(connection);
+        }
+    }
+
+    @SuppressWarnings("SqlWithoutWhere")
+    public int truncate(@NotNull Class<? extends Record> type) throws SQLException {
+        return executeUpdate("DELETE FROM " + Helper.getQuotedTableName(type));
+    }
+
+
+    public <T extends Record> @NotNull List<T> executeQuery(@NotNull Class<T> type, @NotNull @Language("SQL") String query) throws SQLException {
+        var connection = getConnection0();
+        try (var stmt = connection.createStatement()) {
+            Helper.logSqlStatement(query);
+            try (var result = stmt.executeQuery(query)) {
+                return bindAll(type, result);
+            }
+        } finally {
+            close(connection);
+        }
+    }
+
+    public <R extends Record, T extends Throwable> @NotNull List<R> executeQuery(@NotNull Class<R> type, @NotNull @Language("SQL") String query, @NotNull ThrowingConsumer<@NotNull PreparedStatement, T> customizer) throws SQLException, T {
+        var connection = getConnection0();
+        Helper.logSqlStatement(query);
+        try (var stmt = connection.prepareStatement(query)) {
+            customizer.accept(stmt);
+            try (var result = stmt.executeQuery()) {
+                return bindAll(type, result);
+            }
+        } finally {
+            close(connection);
+        }
+    }
+
+    public <T extends Record> @NotNull Optional<T> executeUniqueQuery(@NotNull Class<T> type, @NotNull @Language("SQL") String query) throws SQLException {
+        var connection = getConnection0();
+        try (var stmt = connection.createStatement()) {
+            Helper.logSqlStatement(query);
+            try (var result = stmt.executeQuery(query)) {
+                return bind(type, result);
+            }
+        } finally {
+            close(connection);
+        }
+    }
+
+    public <R extends Record, T extends Throwable> @NotNull Optional<R> executeUniqueQuery(@NotNull Class<R> type, @NotNull @Language("SQL") String query, @NotNull ThrowingConsumer<@NotNull PreparedStatement, T> customizer) throws SQLException, T {
+        var connection = getConnection0();
+        Helper.logSqlStatement(query);
+        try (var stmt = connection.prepareStatement(query)) {
+            customizer.accept(stmt);
+            try (var result = stmt.executeQuery()) {
+                return bind(type, result);
+            }
+        } finally {
+            close(connection);
+        }
+    }
+
+    public int executeUpdate(@NotNull @Language("SQL") String query) throws SQLException {
+        var connection = getConnection0();
+        try (var stmt = connection.createStatement()) {
+            Helper.logSqlStatement(query);
+            return stmt.executeUpdate(query);
+        } finally {
+            close(connection);
+        }
+    }
+
+    public <T extends Throwable> int executeUpdate(@NotNull @Language("SQL") String query, @NotNull ThrowingConsumer<@NotNull PreparedStatement, T> customizer) throws SQLException, T {
+        var connection = getConnection0();
+        Helper.logSqlStatement(query);
+        try (var stmt = connection.prepareStatement(query)) {
+            customizer.accept(stmt);
+            return stmt.executeUpdate();
+        } finally {
+            close(connection);
+        }
+    }
+
+    public @NotNull Connection getConnection() throws SQLException {
+        return ds.getConnection();
+    }
+
+    private @NotNull Connection getConnection0() throws SQLException {
+        return CONNECTION.isBound() ? CONNECTION.get() : ds.getConnection();
+    }
+
+    void close(@NotNull Connection connection) throws SQLException {
+        if (!CONNECTION.isBound() || CONNECTION.get() != connection) connection.close();
+    }
+
+    @Override
+    public void close() {
+        ds.close();
+    }
+
+    public interface ThrowingCallable<R, T extends Throwable> {
+        R call() throws T;
+    }
+
+    public interface ThrowingRunnable<T extends Throwable> {
+        void run() throws T;
+    }
+
+    public interface ThrowingConsumer<S, T extends Throwable> {
+        void accept(S object) throws T;
+    }
+}

bot-database/src/main/java/eu/jonahbauer/chat/bot/database/Entity.java

@@ -0,0 +1,12 @@
+package eu.jonahbauer.chat.bot.database;
+
+import eu.jonahbauer.chat.bot.database.impl.Helper;
+
+public interface Entity<T extends Record & Entity<T>> {
+    long id();
+
+    @SuppressWarnings("unchecked")
+    default T withId(long id) {
+        return Helper.getWithId((Class<T>) getClass()).withId((T) this, id);
+    }
+}

bot-database/src/main/java/eu/jonahbauer/chat/bot/database/NonUniqueResultException.java

@@ -0,0 +1,9 @@
+package eu.jonahbauer.chat.bot.database;
+
+import lombok.experimental.StandardException;
+
+import java.sql.SQLException;
+
+@StandardException
+public class NonUniqueResultException extends SQLException {
+}

bot-database/src/main/java/eu/jonahbauer/chat/bot/database/annotations/Column.java

@@ -0,0 +1,10 @@
+package eu.jonahbauer.chat.bot.database.annotations;
+
+import java.lang.annotation.*;
+
+@Documented
+@Target(ElementType.RECORD_COMPONENT)
+@Retention(RetentionPolicy.RUNTIME)
+public @interface Column {
+    String value();
+}

bot-database/src/main/java/eu/jonahbauer/chat/bot/database/annotations/Table.java

@@ -0,0 +1,10 @@
+package eu.jonahbauer.chat.bot.database.annotations;
+
+import java.lang.annotation.*;
+
+@Documented
+@Target(ElementType.TYPE)
+@Retention(RetentionPolicy.RUNTIME)
+public @interface Table {
+    String value();
+}

bot-database/src/main/java/eu/jonahbauer/chat/bot/database/impl/AbstractFactory.java

@@ -0,0 +1,19 @@
+package eu.jonahbauer.chat.bot.database.impl;
+
+import org.jetbrains.annotations.NotNull;
+
+abstract class AbstractFactory<F> extends ClassValue<F> {
+
+    @Override
+    protected final @NotNull F computeValue(Class<?> type) {
+        if (!type.isRecord()) throw new IllegalArgumentException();
+        return bridge(type);
+    }
+
+    @SuppressWarnings("unchecked")
+    private <T extends Record> @NotNull F bridge(@NotNull Class<?> type) {
+        return computeValue0((Class<T>) type);
+    }
+
+    protected abstract <T extends Record> @NotNull F computeValue0(@NotNull Class<T> type);
+}

bot-database/src/main/java/eu/jonahbauer/chat/bot/database/impl/Binder.java

@@ -0,0 +1,19 @@
+package eu.jonahbauer.chat.bot.database.impl;
+
+import org.jetbrains.annotations.NotNull;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
+public interface Binder<T extends Record> {
+    @SuppressWarnings("unchecked")
+    static <T extends Record> @NotNull Binder<T> get(@NotNull Class<T> type) {
+        return (Binder<T>) BinderFactory.INSTANCE.get(type);
+    }
+
+    default @NotNull T bind(@NotNull ResultSet set) throws SQLException {
+        return bind(set, "");
+    }
+
+    @NotNull T bind(@NotNull ResultSet set, @NotNull String prefix) throws SQLException;
+}

bot-database/src/main/java/eu/jonahbauer/chat/bot/database/impl/BinderFactory.java

@@ -0,0 +1,67 @@
+package eu.jonahbauer.chat.bot.database.impl;
+
+import eu.jonahbauer.chat.bot.database.BindException;
+import eu.jonahbauer.chat.bot.database.impl.types.TypeAdapter;
+import lombok.SneakyThrows;
+import org.jetbrains.annotations.NotNull;
+
+import java.lang.reflect.Constructor;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+final class BinderFactory extends AbstractFactory<Binder<?>> {
+    public static final @NotNull BinderFactory INSTANCE = new BinderFactory();
+
+    private BinderFactory() {}
+
+    @Override
+    @SneakyThrows
+    protected @NotNull <T extends Record> Binder<T> computeValue0(@NotNull Class<T> type) {
+        var components = type.getRecordComponents();
+
+        var columns = new ArrayList<String>();
+        var adapters = new ArrayList<TypeAdapter<?>>();
+        var types = new ArrayList<Class<?>>();
+
+        for (var component : components) {
+            var componentType = component.getType();
+            types.add(componentType);
+            columns.add(Helper.getColumnName(component));
+            adapters.add(TypeAdapter.get(componentType));
+        }
+
+        var ctor = type.getDeclaredConstructor(types.toArray(Class[]::new));
+        return new BinderImpl<>(ctor, columns, adapters);
+    }
+
+    private static final class BinderImpl<T extends Record> implements Binder<T> {
+        private final @NotNull Constructor<T> constructor;
+        private final @NotNull List<@NotNull String> columns;
+        private final @NotNull List<@NotNull TypeAdapter<?>> adapters;
+
+        private BinderImpl(@NotNull Constructor<T> constructor, @NotNull List<@NotNull String> columns, @NotNull List<@NotNull TypeAdapter<?>> adapters) {
+            this.constructor = Objects.requireNonNull(constructor);
+            this.columns = List.copyOf(columns);
+            this.adapters = List.copyOf(adapters);
+            if (this.columns.size() != this.adapters.size()) throw new IllegalArgumentException();
+        }
+
+        @Override
+        public @NotNull T bind(@NotNull ResultSet result, @NotNull String prefix) throws SQLException {
+            try {
+                var count = columns.size();
+                var arguments = new Object[count];
+                for (int i = 0; i < count; i++) {
+                    var index = result.findColumn(prefix + columns.get(i));
+                    arguments[i] = adapters.get(i).extract(result, index);
+                }
+                return constructor.newInstance(arguments);
+            } catch (Exception ex) {
+                throw new BindException(ex);
+            }
+        }
+    }
+}

bot-database/src/main/java/eu/jonahbauer/chat/bot/database/impl/Helper.java

@@ -0,0 +1,173 @@
+package eu.jonahbauer.chat.bot.database.impl;
+
+import eu.jonahbauer.chat.bot.database.Entity;
+import eu.jonahbauer.chat.bot.database.annotations.Column;
+import eu.jonahbauer.chat.bot.database.annotations.Table;
+import lombok.Lombok;
+import lombok.SneakyThrows;
+import lombok.experimental.UtilityClass;
+import org.jetbrains.annotations.NotNull;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.reflect.RecordComponent;
+import java.util.HashMap;
+import java.util.Map;
+
+import static java.lang.invoke.MethodHandles.*;
+import static java.lang.invoke.MethodType.methodType;
+
+@UtilityClass
+public class Helper {
+    public static @NotNull String getQuotedColumnName(@NotNull RecordComponent component) {
+        return quote(getColumnName(component));
+    }
+    public static @NotNull String getColumnName(@NotNull RecordComponent component) {
+        return getColumnName(component.getDeclaringRecord(), component.getName());
+    }
+    public static @NotNull String getColumnName(@NotNull Class<?> type, @NotNull String component) {
+        var out = columnNameCache.get(type).get(component);
+        if (out == null) throw new IllegalArgumentException("invalid component name " + component);
+        return out;
+    }
+    private static final @NotNull ClassValue<@NotNull Map<@NotNull String, @NotNull String>> columnNameCache = new ClassValue<>() {
+        @Override
+        protected @NotNull Map<@NotNull String, @NotNull String> computeValue(@NotNull Class<?> type) {
+            var out = new HashMap<String, String>();
+
+            for (var component : type.getRecordComponents()) {
+                var column = component.getAnnotation(Column.class);
+                if (column != null) {
+                    out.put(component.getName(), column.value());
+                } else {
+                    out.put(component.getName(), getDatabaseName(component.getName()));
+                }
+            }
+
+            return Map.copyOf(out);
+        }
+    };
+
+    public static @NotNull String getQuotedTableName(@NotNull Class<? extends Record> type) {
+        return tableNameCache.get(type);
+    }
+    private static final @NotNull ClassValue<@NotNull String> tableNameCache = new ClassValue<>() {
+        @Override
+        protected @NotNull String computeValue(@NotNull Class<?> type) {
+            var table = type.getAnnotation(Table.class);
+            if (table != null) {
+                return quote(table.value());
+            } else {
+                return quote(getDatabaseName(type.getSimpleName()));
+            }
+        }
+    };
+
+    public static boolean isIdColumn(@NotNull RecordComponent component) {
+        return Entity.class.isAssignableFrom(component.getDeclaringRecord())
+               && component.getType() == long.class
+               && "id".equals(component.getName());
+    }
+
+    @SuppressWarnings("unchecked")
+    public static <T extends Record & Entity<T>> WithId<T> getWithId(@NotNull Class<T> type) {
+        return (WithId<T>) withIdCache.get(type);
+    }
+    private static final @NotNull ClassValue<@NotNull WithId<?>> withIdCache = new ClassValue<>() {
+        @Override
+        @SneakyThrows
+        protected WithId<?> computeValue(Class<?> type) {
+            if (!type.isRecord()) throw new IllegalArgumentException();
+            if (!Entity.class.isAssignableFrom(type)) throw new IllegalArgumentException();
+
+            var lookup = MethodHandles.lookup();
+
+            var components = type.getRecordComponents();
+            var types = new Class<?>[components.length];
+            var accessors = new MethodHandle[components.length];
+            var reorder = new int[components.length];
+
+            for (int i = 0; i < components.length; i++) {
+                var component = components[i];
+                types[i] = component.getType();
+                if (isIdColumn(component)) {
+                    accessors[i] = identity(long.class);
+                    reorder[i] = 1;
+                } else {
+                    accessors[i] = lookup.unreflect(component.getAccessor());
+                    reorder[i] = 0;
+                }
+            }
+
+            var ctor = lookup.findConstructor(type, methodType(void.class, types));
+            var cloner = filterArguments(ctor, 0, accessors);
+            var wither = permuteArguments(cloner, methodType(type, type, long.class), reorder);
+
+            return create(wither.asType(methodType(Record.class, Record.class, long.class)));
+        }
+
+        @SuppressWarnings("unchecked")
+        private <T extends Record & Entity<T>> WithId<T> create(@NotNull MethodHandle handle) {
+            return (entity, id) -> {
+                try {
+                    return (T) handle.invokeExact(entity, id);
+                } catch (Throwable t) {
+                    throw Lombok.sneakyThrow(t);
+                }
+            };
+        }
+    };
+
+
+    private static final @NotNull Logger log = LoggerFactory.getLogger("eu.jonahbauer.chat.bot.database.SQL");
+    public static void logSqlStatement(@NotNull String sql) {
+        log.debug(sql);
+    }
+
+    private static @NotNull String getDatabaseName(@NotNull String name) {
+        if (name.length() <= 1) return name;
+
+        StringBuilder out = null;
+        for (int i = 1, length = name.length(); i < length; i++) {
+            var prev = name.charAt(i - 1);
+            var curr = name.charAt(i);
+            if (Character.isLowerCase(prev) && Character.isUpperCase(curr)) {
+                if (out == null) {
+                    out = new StringBuilder(name.length() + 1);
+                    out.append(name, 0, i);
+                    out.setCharAt(0, Character.toLowerCase(out.charAt(0)));
+                }
+                out.append('_');
+                out.append(Character.toLowerCase(curr));
+            } else if (out != null) {
+                out.append(curr);
+            }
+        }
+
+        if (out == null) {
+            if (Character.isUpperCase(name.charAt(0))) {
+                return Character.toLowerCase(name.charAt(0)) + name.substring(1);
+            } else {
+                return name;
+            }
+        } else {
+            return out.toString();
+        }
+    }
+
+    public static @NotNull String quote(@NotNull String name) {
+        var out = new StringBuilder(name.length() + 2);
+        out.append('"');
+        for (int i = 0, length = name.length(); i < length; i++) {
+            var chr = name.charAt(i);
+            if (chr == '"') out.append('"');
+            if (chr == '\n') out.append('\\');
+
+            out.append(chr);
+        }
+        out.append('"');
+        return out.toString();
+    }
+}

bot-database/src/main/java/eu/jonahbauer/chat/bot/database/impl/Inserter.java

@@ -0,0 +1,15 @@
+package eu.jonahbauer.chat.bot.database.impl;
+
+import org.jetbrains.annotations.NotNull;
+
+import java.sql.Connection;
+import java.sql.SQLException;
+
+public interface Inserter<T extends Record> {
+    @SuppressWarnings("unchecked")
+    static <T extends Record> @NotNull Inserter<T> get(@NotNull Class<T> type) {
+        return (Inserter<T>) InserterFactory.INSTANCE.get(type);
+    }
+
+    long insert(@NotNull Connection connection, @NotNull T entity) throws SQLException;
+}

bot-database/src/main/java/eu/jonahbauer/chat/bot/database/impl/InserterFactory.java

@@ -0,0 +1,39 @@
+package eu.jonahbauer.chat.bot.database.impl;
+
+import eu.jonahbauer.chat.bot.database.Entity;
+import org.jetbrains.annotations.NotNull;
+
+import java.sql.Connection;
+import java.sql.SQLException;
+import java.util.Collections;
+
+final class InserterFactory extends AbstractFactory<@NotNull Inserter<?>> {
+    public static final @NotNull InserterFactory INSTANCE = new InserterFactory();
+
+    private InserterFactory() {}
+
+    @Override
+    protected <T extends Record> @NotNull Inserter<?> computeValue0(@NotNull Class<T> type) {
+        var isEntity = Entity.class.isAssignableFrom(type);
+        var table = Helper.getQuotedTableName(type);
+        var preparer = Preparer.get(type);
+        var columns = preparer.columns();
+
+        var query = STR."""
+                    INSERT INTO \{table} (\{String.join(", ", columns)})
+                    VALUES (\{String.join(", ", Collections.nCopies(columns.size(), "?"))})
+                    \{isEntity ? "RETURNING id" : "RETURNING -1"}
+                    """;
+
+        return (Connection connection, T entity) -> {
+            Helper.logSqlStatement(query);
+            try (var stmt = connection.prepareStatement(query)) {
+                preparer.prepare(stmt, entity);
+                try (var result = stmt.executeQuery()) {
+                    if (!result.next()) throw new SQLException();
+                    return result.getLong(1);
+                }
+            }
+        };
+    }
+}

bot-database/src/main/java/eu/jonahbauer/chat/bot/database/impl/Preparer.java

@@ -0,0 +1,23 @@
+package eu.jonahbauer.chat.bot.database.impl;
+
+import org.jetbrains.annotations.NotNull;
+
+import java.sql.PreparedStatement;
+import java.sql.SQLException;
+import java.util.List;
+
+public interface Preparer<T extends Record> {
+
+    @SuppressWarnings("unchecked")
+    static <T extends Record> @NotNull Preparer<T> get(@NotNull Class<T> type) {
+        return (Preparer<T>) PreparerFactory.INSTANCE.get(type);
+    }
+
+    default void prepare(@NotNull PreparedStatement statement, @NotNull T entity) throws SQLException {
+        prepare(statement, entity, 1);
+    }
+
+    void prepare(@NotNull PreparedStatement statement, @NotNull T entity, int index) throws SQLException;
+
+    @NotNull List<@NotNull String> columns();
+}

bot-database/src/main/java/eu/jonahbauer/chat/bot/database/impl/PreparerFactory.java

@@ -0,0 +1,74 @@
+package eu.jonahbauer.chat.bot.database.impl;
+
+import eu.jonahbauer.chat.bot.database.impl.types.TypeAdapter;
+import lombok.Lombok;
+import org.jetbrains.annotations.NotNull;
+
+import java.lang.reflect.Method;
+import java.sql.PreparedStatement;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.List;
+
+final class PreparerFactory extends AbstractFactory<Preparer<?>> {
+    public static final @NotNull PreparerFactory INSTANCE = new PreparerFactory();
+
+    private PreparerFactory() {}
+
+    @Override
+    protected  <T extends Record> @NotNull Preparer<T> computeValue0(@NotNull Class<T> type) {
+        var components = type.getRecordComponents();
+
+        var columns = new ArrayList<String>(components.length - 1);
+        var accessors = new ArrayList<Method>(components.length - 1);
+        var adapters = new ArrayList<TypeAdapter<?>>(components.length - 1);
+
+        for (var component : components) {
+            if (Helper.isIdColumn(component)) continue;
+
+            columns.add(Helper.getQuotedColumnName(component));
+            accessors.add(component.getAccessor());
+            adapters.add(TypeAdapter.get(component.getType()));
+        }
+
+        return new PreparerImpl<>(columns, adapters, accessors);
+    }
+
+    private static final class PreparerImpl<T extends Record> implements Preparer<T> {
+        private final @NotNull List<@NotNull String> columns;
+        private final @NotNull List<@NotNull TypeAdapter<?>> adapters;
+        private final @NotNull List<@NotNull Method> accessors;
+
+        public PreparerImpl(
+                @NotNull List<@NotNull String> columns,
+                @NotNull List<@NotNull TypeAdapter<?>> adapters,
+                @NotNull List<@NotNull Method> accessors
+        ) {
+            this.columns = List.copyOf(columns);
+            this.adapters = List.copyOf(adapters);
+            this.accessors = List.copyOf(accessors);
+            if (this.columns.size() != this.adapters.size() || this.adapters.size() != this.accessors.size()) {
+                throw new IllegalArgumentException();
+            }
+        }
+
+        @Override
+        public void prepare(@NotNull PreparedStatement stmt, @NotNull T entity, int offset) throws SQLException {
+            try {
+                for (int i = 0, length = columns.size(); i < length; i++) {
+                    var value = accessors.get(i).invoke(entity);
+                    adapters.get(i).prepareUnsafe(stmt, i + offset, value);
+                }
+            } catch (SQLException ex) {
+                throw ex;
+            } catch (Exception ex) {
+                throw Lombok.sneakyThrow(ex);
+            }
+        }
+
+        @Override
+        public @NotNull List<@NotNull String> columns() {
+            return columns;
+        }
+    }
+}

bot-database/src/main/java/eu/jonahbauer/chat/bot/database/impl/Updater.java

@@ -0,0 +1,16 @@
+package eu.jonahbauer.chat.bot.database.impl;
+
+import eu.jonahbauer.chat.bot.database.Entity;
+import org.jetbrains.annotations.NotNull;
+
+import java.sql.Connection;
+import java.sql.SQLException;
+
+public interface Updater<T extends Record & Entity> {
+    @SuppressWarnings("unchecked")
+    static <T extends Record & Entity> @NotNull Updater<T> get(@NotNull Class<T> type) {
+        return (Updater<T>) UpdaterFactory.INSTANCE.get(type);
+    }
+
+    boolean update(@NotNull Connection connection, @NotNull T entity) throws SQLException;
+}

bot-database/src/main/java/eu/jonahbauer/chat/bot/database/impl/UpdaterFactory.java

@@ -0,0 +1,45 @@
+package eu.jonahbauer.chat.bot.database.impl;
+
+import eu.jonahbauer.chat.bot.database.Entity;
+import org.jetbrains.annotations.NotNull;
+
+import java.sql.Connection;
+import java.util.stream.Collectors;
+
+final class UpdaterFactory extends AbstractFactory<@NotNull Updater<?>> {
+    public static final @NotNull UpdaterFactory INSTANCE = new UpdaterFactory();
+
+    private UpdaterFactory() {}
+
+    @Override
+    protected <T extends Record> @NotNull Updater<?> computeValue0(@NotNull Class<T> type) {
+        if (!Entity.class.isAssignableFrom(type)) throw new IllegalArgumentException();
+        return bridge(type);
+    }
+
+    @SuppressWarnings("unchecked")
+    private <T extends Record & Entity> @NotNull Updater<T> bridge(@NotNull Class<?> type) {
+        return computeValue1((Class<T>) type);
+    }
+
+    private <T extends Record & Entity> @NotNull Updater<T> computeValue1(@NotNull Class<T> type) {
+        var table = Helper.getQuotedTableName(type);
+        var preparer = Preparer.get(type);
+        var columns = preparer.columns();
+
+        var query = STR."""
+                    UPDATE \{table}
+                    SET \{columns.stream().map(col -> col + " = ?").collect(Collectors.joining(", "))}
+                    WHERE id = ?
+                    """;
+
+        return (Connection connection, T entity) -> {
+            Helper.logSqlStatement(query);
+            try (var stmt = connection.prepareStatement(query)) {
+                preparer.prepare(stmt, entity);
+                stmt.setLong(columns.size() + 1, entity.id());
+                return stmt.executeUpdate() == 1;
+            }
+        };
+    }
+}

bot-database/src/main/java/eu/jonahbauer/chat/bot/database/impl/WithId.java

@@ -0,0 +1,8 @@
+package eu.jonahbauer.chat.bot.database.impl;
+
+import eu.jonahbauer.chat.bot.database.Entity;
+
+@FunctionalInterface
+public interface WithId<T extends Record & Entity<T>> {
+    T withId(T entity, long id);
+}

bot-database/src/main/java/eu/jonahbauer/chat/bot/database/impl/types/EnumTypeAdapter.java

@@ -0,0 +1,28 @@
+package eu.jonahbauer.chat.bot.database.impl.types;
+
+import lombok.RequiredArgsConstructor;
+import org.jetbrains.annotations.NotNull;
+
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Types;
+
+@RequiredArgsConstructor
+public class EnumTypeAdapter<E extends Enum<E>> implements TypeAdapter<E> {
+    private final @NotNull Class<E> type;
+
+    @Override
+    public void prepare(@NotNull PreparedStatement stmt, int index, E value) throws SQLException {
+        if (value == null) {
+            stmt.setNull(index, Types.VARCHAR);
+        } else {
+            stmt.setString(index, value.name());
+        }
+    }
+
+    @Override
+    public E extract(@NotNull ResultSet result, int index) throws SQLException {
+        return Enum.valueOf(type, result.getString(index));
+    }
+}

bot-database/src/main/java/eu/jonahbauer/chat/bot/database/impl/types/InstantTypeAdapter.java

@@ -0,0 +1,31 @@
+package eu.jonahbauer.chat.bot.database.impl.types;
+
+import org.jetbrains.annotations.NotNull;
+
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Types;
+import java.time.Instant;
+
+public class InstantTypeAdapter implements TypeAdapter<Instant> {
+
+    @Override
+    public void prepare(@NotNull PreparedStatement stmt, int index, Instant value) throws SQLException {
+        if (value == null) {
+            stmt.setNull(index, Types.INTEGER);
+        } else {
+            stmt.setLong(index, value.toEpochMilli());
+        }
+    }
+
+    @Override
+    public Instant extract(@NotNull ResultSet result, int index) throws SQLException {
+        var millis = result.getLong(index);
+        if (result.wasNull()) {
+            return null;
+        } else {
+            return Instant.ofEpochMilli(millis);
+        }
+    }
+}

bot-database/src/main/java/eu/jonahbauer/chat/bot/database/impl/types/JdbcTypeAdapter.java

@@ -0,0 +1,79 @@
+package eu.jonahbauer.chat.bot.database.impl.types;
+
+import org.jetbrains.annotations.NotNull;
+
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Types;
+
+public class JdbcTypeAdapter<T> implements TypeAdapter<T> {
+    private final @NotNull Class<T> type;
+
+    JdbcTypeAdapter(@NotNull Class<T> type) {
+        this.type = type;
+    }
+
+    @Override
+    public void prepare(@NotNull PreparedStatement stmt, int index, T value) throws SQLException {
+        if (type == byte.class || type == Byte.class) {
+            if (value == null) stmt.setNull(index, Types.INTEGER);
+            else stmt.setByte(index, (byte) value);
+        } else if (type == char.class || type == Character.class) {
+            if (value == null) stmt.setNull(index, Types.INTEGER);
+            else stmt.setShort(index, (short) (char) value);
+        } else if (type == short.class || type == Short.class) {
+            if (value == null) stmt.setNull(index, Types.INTEGER);
+            else stmt.setShort(index, (short) value);
+        } else if (type == int.class || type == Integer.class) {
+            if (value == null) stmt.setNull(index, Types.INTEGER);
+            else stmt.setInt(index, (int) value);
+        } else if (type == long.class || type == Long.class) {
+            if (value == null) stmt.setNull(index, Types.INTEGER);
+            else stmt.setLong(index, (long) value);
+        } else if (type == float.class || type == Float.class) {
+            if (value == null) stmt.setNull(index, Types.FLOAT);
+            else stmt.setFloat(index, (float) value);
+        } else if (type == double.class || type == Double.class) {
+            if (value == null) stmt.setNull(index, Types.DOUBLE);
+            else stmt.setDouble(index, (double) value);
+        } else if (type == boolean.class || type == Boolean.class) {
+            if (value == null) stmt.setNull(index, Types.BOOLEAN);
+            else stmt.setBoolean(index, (boolean) value);
+        } else {
+            stmt.setObject(index, value);
+        }
+    }
+
+    @Override
+    @SuppressWarnings("unchecked")
+    public T extract(@NotNull ResultSet result, int index) throws SQLException {
+        if (type == byte.class || type == Byte.class) {
+            var out = (T) (Byte) result.getByte(index);
+            return result.wasNull() ? null : out;
+        } else if (type == char.class || type == Character.class) {
+            var out = (T) (Character) (char) result.getShort(index);
+            return result.wasNull() ? null : out;
+        } else if (type == short.class || type == Short.class) {
+            var out = (T) (Short) result.getShort(index);
+            return result.wasNull() ? null : out;
+        } else if (type == int.class || type == Integer.class) {
+            var out = (T) (Integer) result.getInt(index);
+            return result.wasNull() ? null : out;
+        } else if (type == long.class || type == Long.class) {
+            var out = (T) (Long) result.getLong(index);
+            return result.wasNull() ? null : out;
+        } else if (type == float.class || type == Float.class) {
+            var out = (T) (Float) result.getFloat(index);
+            return result.wasNull() ? null : out;
+        } else if (type == double.class || type == Double.class) {
+            var out = (T) (Double) result.getDouble(index);
+            return result.wasNull() ? null : out;
+        } else if (type == boolean.class || type == Boolean.class) {
+            var out = (T) (Boolean) result.getBoolean(index);
+            return result.wasNull() ? null : out;
+        } else {
+            return result.getObject(index, type);
+        }
+    }
+}

bot-database/src/main/java/eu/jonahbauer/chat/bot/database/impl/types/TypeAdapter.java

@@ -0,0 +1,36 @@
+package eu.jonahbauer.chat.bot.database.impl.types;
+
+import org.jetbrains.annotations.NotNull;
+
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.time.Instant;
+
+public interface TypeAdapter<T> {
+    @SuppressWarnings("unchecked")
+    static <T> @NotNull TypeAdapter<T> get(@NotNull Class<T> type) {
+        if (type == Instant.class) {
+            return (TypeAdapter<T>) new InstantTypeAdapter();
+        } else if (Enum.class.isAssignableFrom(type)) {
+            return (TypeAdapter<T>) newEnumTypeAdapter(type);
+        } else {
+            return new JdbcTypeAdapter<>(type);
+        }
+    }
+
+    @SuppressWarnings("unchecked")
+    private static <E extends Enum<E>> EnumTypeAdapter<?> newEnumTypeAdapter(Class<?> type) {
+        return new EnumTypeAdapter<>((Class<E>) type);
+    }
+
+    @SuppressWarnings("unchecked")
+    default void prepareUnsafe(@NotNull PreparedStatement stmt, int index, Object value) throws SQLException {
+        prepare(stmt, index, (T) value);
+    }
+
+    void prepare(@NotNull PreparedStatement stmt, int index, T value) throws SQLException;
+
+    T extract(@NotNull ResultSet result, int index) throws SQLException;
+
+}

bot-database/src/main/java/module-info.java

@@ -0,0 +1,12 @@
+module eu.jonahbauer.chat.bot.database {
+    exports eu.jonahbauer.chat.bot.database;
+    exports eu.jonahbauer.chat.bot.database.annotations;
+
+    requires transitive java.sql;
+    requires org.xerial.sqlitejdbc;
+    requires com.zaxxer.hikari;
+    requires org.slf4j;
+
+    requires static lombok;
+    requires static transitive org.jetbrains.annotations;
+}

bot-database/src/test/java/eu/jonahbauer/chat/bot/database/DatabaseTest.java

@@ -0,0 +1,155 @@
+package eu.jonahbauer.chat.bot.database;
+
+import eu.jonahbauer.chat.bot.database.annotations.Column;
+import eu.jonahbauer.chat.bot.database.annotations.Table;
+import org.intellij.lang.annotations.Language;
+import org.jetbrains.annotations.NotNull;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.sql.SQLException;
+import java.util.List;
+import java.util.Optional;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class DatabaseTest {
+
+    @TempDir
+    static Path temp;
+
+    Database database;
+
+    @BeforeEach
+    void init() throws IOException, SQLException {
+        var file = Files.createTempFile(temp, "database", ".db");
+        var url = "jdbc:sqlite:" + file.toAbsolutePath();
+        database = new Database(url);
+        database.executeUpdate("""
+        CREATE TABLE "pizza"
+        (
+            "id"            INTEGER PRIMARY KEY AUTOINCREMENT,
+            "restaurant_id" INTEGER      NOT NULL,
+            "number"        INTEGER      NOT NULL,
+            "name"          VARCHAR(255) NOT NULL,
+            "ingredients"   VARCHAR(255) NOT NULL,
+            "price"         DOUBLE       NOT NULL,
+            "test"          INTEGER
+        )
+        """);
+    }
+
+    @Test
+    void crud() throws SQLException {
+        crud(Pizza.class, Pizza::new);
+    }
+
+    @Test
+    void annotations() throws SQLException {
+        crud(AnnotatedPizza.class, AnnotatedPizza::new);
+    }
+
+    @Test
+    void transaction() throws SQLException {
+        assertThrowsExactly(RuntimeException.class, () -> {
+            database.transaction(() -> {
+                assertThrows(IllegalStateException.class, () -> database.transaction(() -> {}));
+
+                database.insert(new Pizza(-1, 1, 10, "Salami", "Salami, Tomaten, Brot", 12.5));
+                assertEquals(1, database.findAll(Pizza.class).size());
+                throw new RuntimeException();
+            });
+        });
+        assertEquals(List.of(), database.findAll(Pizza.class));
+    }
+
+    @Test
+    void find() throws SQLException {
+        var salami = new Pizza(1, 1, 10, "Salami", "Salami, Tomaten, Brot", 12.5);
+        var speziale = new Pizza(2, 1, 15, "Speziale", "Salami, Schinken, Pilze, Tomaten, Brot", 12.5);
+
+        assertEquals(1, database.insert(salami));
+        assertEquals(2, database.insert(speziale));
+
+        assertEquals(Optional.empty(), database.findWhere(Pizza.class, "name", "Hawaii"));
+        assertEquals(Optional.of(salami), database.findWhere(Pizza.class, "name", "Salami"));
+        assertEquals(Optional.of(speziale), database.findWhere(Pizza.class, "name", "Speziale"));
+        assertThrows(NonUniqueResultException.class, () -> database.findWhere(Pizza.class, "restaurantId", 1L));
+        assertEquals(List.of(salami, speziale), database.findAllWhere(Pizza.class, "restaurantId", 1L));
+    }
+
+    @Test
+    void join() throws SQLException {
+        var salami = new Pizza(1, 1, 10, "Salami", "Salami, Tomaten, Brot", 12.5);
+        var speziale = new Pizza(2, 1, 15, "Speziale", "Salami, Schinken, Pilze, Tomaten, Brot", 12.5);
+
+        assertEquals(1, database.insert(salami));
+        assertEquals(2, database.insert(speziale));
+
+        @Language("SQL")
+        var query = """
+                    SELECT "pizza".*
+                    FROM "pizza"
+                        JOIN "pizza" "p2" ON "pizza"."restaurant_id" = "p2"."restaurant_id"
+                    """;
+        assertEquals(List.of(salami, salami, speziale, speziale), database.executeQuery(Pizza.class, query));
+
+        @Language("SQL")
+        var query2 = """
+                    SELECT "p2".*
+                    FROM "pizza"
+                        JOIN "pizza" "p2" ON "pizza"."restaurant_id" = "p2"."restaurant_id"
+                    """;
+        assertEquals(List.of(salami, speziale, salami, speziale), database.executeQuery(Pizza.class, query2));
+    }
+
+    private <T extends Record & Entity<T>> void crud(@NotNull Class<T> type, @NotNull PizzaBaker<T> baker) throws SQLException {
+        var salami = baker.bake(-1, 1, 10, "Salami", "Salami, Tomaten, Brot", 12.5);
+        var persistent = baker.bake(1, 1, 10, "Salami", "Salami, Tomaten, Brot", 12.5);
+        var speziale = baker.bake(1, 1, 15, "Speziale", "Salami, Schinken, Pilze, Tomaten, Brot", 12.5);
+
+        // create
+        assertEquals(1, database.insert(salami));
+        assertEquals(List.of(persistent), database.findAll(type));
+        assertEquals(Optional.of(persistent), database.findById(type, 1));
+        assertEquals(Optional.empty(), database.findById(type, 2));
+
+        // update
+        assertFalse(database.update(salami));
+        assertTrue(database.update(speziale));
+        assertEquals(List.of(speziale), database.findAll(type));
+        assertEquals(Optional.of(speziale), database.findById(type, 1));
+        assertEquals(Optional.empty(), database.findById(type, 2));
+
+        // delete
+        assertFalse(database.delete(type, 2));
+        assertTrue(database.delete(type, 1));
+        assertEquals(List.of(), database.findAll(type));
+
+        // truncate
+        database.insert(salami);
+        database.insert(speziale);
+        assertEquals(2, database.findAll(type).size());
+        assertEquals(2, database.truncate(type));
+        assertEquals(List.of(), database.findAll(type));
+    }
+
+    @AfterEach
+    void cleanup() {
+        database.close();
+    }
+
+    private interface PizzaBaker<T extends Record & Entity<T>> {
+        @NotNull T bake(long id, long restaurantId, int number, @NotNull String name, @NotNull String ingredients, double price);
+    }
+    
+    public record Pizza(long id, long restaurantId, int number, @NotNull String name, @NotNull String ingredients, double price) implements Entity<Pizza> {}
+    
+    @Table("pizza")
+    public record AnnotatedPizza(long id, @Column("restaurant_id") long restaurant, int number, @NotNull String name, @NotNull String ingredients, double price) implements Entity<AnnotatedPizza> {}
+}

bot-database/src/test/java/eu/jonahbauer/chat/bot/database/EntityTest.java

@@ -0,0 +1,17 @@
+package eu.jonahbauer.chat.bot.database;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class EntityTest {
+
+    public record TestEntity(long id, String foo, String bar) implements Entity<TestEntity> {}
+    public record TestEntity2(String foo, String bar, long id) implements Entity<TestEntity2> {}
+
+    @Test
+    void withId() {
+        assertEquals(new TestEntity(1, "foo", "bar"), new TestEntity(0, "foo", "bar").withId(1));
+        assertEquals(new TestEntity2("foo", "bar", 1), new TestEntity2("foo", "bar", 0).withId(1));
+    }
+}

bots/ping-bot/build.gradle.kts

@@ -3,4 +3,3 @@ plugins {
 }
 
 group = "eu.jonahbauer.chat.bots"
-version = "0.1.0-SNAPSHOT"

bots/ping-bot/src/main/java/module-info.java

@@ -3,7 +3,7 @@ import eu.jonahbauer.chat.bot.ping.PingBot;
 
 module eu.jonahbauer.chat.bot.ping {
     requires eu.jonahbauer.chat.bot.api;
-    requires org.apache.logging.log4j;
+    requires org.slf4j;
     requires static lombok;
 
     provides ChatBot with PingBot;

bots/pizza-bot/build.gradle.kts

@@ -0,0 +1,10 @@
+plugins {
+    id("chat-bot.bot-conventions")
+}
+
+group = "eu.jonahbauer.chat.bots"
+
+dependencies {
+    implementation(project(":bot-database"))
+    testImplementation(testFixtures(project(":bot-api")))
+}

bots/pizza-bot/src/main/java/eu/jonahbauer/chat/bot/pizza/PizzaBot.java

@@ -0,0 +1,692 @@
+package eu.jonahbauer.chat.bot.pizza;
+
+import eu.jonahbauer.chat.bot.api.ChatBot;
+import eu.jonahbauer.chat.bot.api.Message.Post;
+import eu.jonahbauer.chat.bot.config.BotConfig;
+import eu.jonahbauer.chat.bot.database.Database;
+import eu.jonahbauer.chat.bot.database.NonUniqueResultException;
+import eu.jonahbauer.chat.bot.pizza.model.*;
+import eu.jonahbauer.chat.bot.pizza.model.table.Order;
+import eu.jonahbauer.chat.bot.pizza.model.table.OrderItem;
+import eu.jonahbauer.chat.bot.pizza.model.table.Pizza;
+import eu.jonahbauer.chat.bot.pizza.model.table.User;
+import eu.jonahbauer.chat.bot.pizza.model.view.OrderDetail;
+import eu.jonahbauer.chat.bot.pizza.model.view.OrderItemDetail;
+import eu.jonahbauer.chat.bot.pizza.util.ArgumentParser;
+import eu.jonahbauer.chat.bot.pizza.util.Pair;
+import lombok.extern.slf4j.Slf4j;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import org.jetbrains.annotations.VisibleForTesting;
+
+import java.sql.SQLException;
+import java.time.ZoneId;
+import java.time.format.DateTimeFormatter;
+import java.util.*;
+import java.util.function.BiConsumer;
+import java.util.function.BinaryOperator;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+
+import static eu.jonahbauer.chat.bot.pizza.util.ArgumentParser.*;
+import static eu.jonahbauer.chat.bot.pizza.util.FormatUtils.*;
+import static java.util.FormatProcessor.FMT;
+
+@Slf4j
+public class PizzaBot extends ChatBot {
+    private static final @NotNull ScopedValue<Double> ANNOYANCE = ScopedValue.newInstance();
+    private static final @NotNull ScopedValue<User> USER = ScopedValue.newInstance();
+
+    private static final @NotNull BotConfig.Key.OfStringArray PRIMARY_CHANNELS = BotConfig.Key.ofStringArray("primary_channels");
+    private static final @NotNull BotConfig.Key.OfString DATABASE = BotConfig.Key.ofString("database");
+
+    private static final @NotNull DateTimeFormatter DATE_FORMATTER = DateTimeFormatter.ofPattern("HH:mm")
+            .withZone(ZoneId.of("Europe/Berlin"))
+            .withLocale(Locale.GERMANY);
+    private static final @NotNull List<@NotNull String> ANNOYED_RESPONSES = List.of(
+            "Es ist so dunkel, ich kann dich nicht hören.",
+            "Jetzt schrei doch nicht so!",
+            "Fresse!"
+    );
+
+    private final @Nullable Set<@NotNull String> primaryChannels;
+    private final @NotNull PizzaService service;
+
+    public PizzaBot() {
+        super("Marek");
+        this.primaryChannels = getConfig().get(PRIMARY_CHANNELS).map(Set::copyOf).orElse(null);
+        this.service = new PizzaService(new Database(getConfig().require(DATABASE)));
+    }
+
+    @VisibleForTesting
+    PizzaBot(@Nullable Set<@NotNull String> primaryChannels, @NotNull Database database) {
+        super("Marek");
+        this.primaryChannels = primaryChannels;
+        this.service = new PizzaService(database);
+    }
+
+    @Override
+    protected void onMessage(@NotNull Post post) {
+        var message = post.message();
+        if (message.length() < 6) return;
+
+        var command = message.substring(0, 6);
+
+        var runnable = (Runnable) () -> {
+            try {
+                if ("!marek".equals(command) || "!Marek".equals(command)) {
+                    handle(post);
+                } else if ("!MAREK".equals(command) && !ANNOYED_RESPONSES.isEmpty()) {
+                    handleAnnoyed();
+                } else if ("!marek".equalsIgnoreCase(command)) {
+                    var uppercase = command.chars().filter(chr -> 'A' <= chr && chr <= 'Z').count();
+                    ScopedValue.runWhere(ANNOYANCE, uppercase / 5d, () -> handle(post));
+                }
+            } catch (PizzaBotException ex) {
+                post(ex.getMessage());
+            }
+        };
+
+        if (post.userId() != null && post.userName() != null) {
+            ScopedValue.runWhere(USER, new User(post.userId(), post.userName()), runnable);
+        } else {
+            runnable.run();
+        }
+    }
+
+    private void handle(@NotNull Post post) {
+        if (!isPrimaryChannel(post.channel())) {
+            handleNonPrimaryChannel();
+        } else {
+            try {
+                dispatch(ArgumentParser.parse(post.message().substring(6)));
+            } catch (SQLException ex) {
+                log.error("Fehler beim Verarbeiten von {}.", post, ex);
+            }
+        }
+    }
+
+    private void handleAnnoyed() {
+        assert !ANNOYED_RESPONSES.isEmpty();
+
+        var idx = (int) (Math.random() * ANNOYED_RESPONSES.size());
+        post(ANNOYED_RESPONSES.get(idx));
+    }
+
+    private void handleNonPrimaryChannel() {
+        assert primaryChannels != null;
+
+        if (primaryChannels.size() == 1) {
+            post(STR."Bitte benutze den Channel \{primaryChannels.iterator().next()}.");
+        } else {
+            var channels = new StringBuilder();
+            var it = primaryChannels.iterator();
+            while (it.hasNext()) {
+                var channel = it.next();
+                if (!it.hasNext()) {
+                    channels.append(" oder ");
+                } else if (!channels.isEmpty()) {
+                    channels.append(", ");
+                }
+                channels.append(channel);
+            }
+            post(STR."Bitte benutze einen der Channel \{channels.toString()}.");
+        }
+    }
+
+    private void dispatch(@NotNull List<@NotNull String> args) throws SQLException {
+        if (args.isEmpty()) {
+            helpUser();
+            return;
+        }
+
+        var argc = args.size();
+        var command = args.getFirst();
+        switch (command) {
+            case "--user", "-u" -> runAs(args);
+            case "help" -> {
+                if (argc > 1 && "--all".equals(args.get(1))) {
+                    helpAdmin();
+                } else {
+                    helpUser();
+                }
+            }
+            case "info" -> info();
+            case "order" -> {
+                if (argc == 1) throw new PizzaBotException("too few arguments");
+                switch (args.get(1)) {
+                    case "revoke" -> {
+                        if (argc == 2) orderRevoke();
+                        else if (argc != 3) throw new PizzaBotException("too many arguments");
+                        else switch (args.get(2)) {
+                            case "--all" -> orderRevokeAll();
+                            case String s when isLong(s) -> orderRevoke(toLong(s));
+                            case String name -> orderRevoke(name);
+                        }
+                    }
+                    case "list" -> {
+                        if (argc == 2) orderList();
+//                        else if (argc == 3 && "--all".equals(args.get(2))) orderListAll();
+                        else throw new PizzaBotException("invalid command");
+                    }
+                    case "add" -> {
+                        if (argc < 4) throw new PizzaBotException("too few arguments");
+                        else if (argc > 4) throw new PizzaBotException("too many arguments");
+                        orderAdd(args.get(2), args.get(3));
+                    }
+                    case String name when argc == 2 -> order(name, null);
+                    case String name -> order(name, String.join(" ", args.subList(2, args.size())));
+                }
+            }
+            case "summary" -> {
+                if (argc == 1) summary();
+                else if (argc == 2 && "--all".equals(args.get(1))) summaryAll();
+                else if (argc == 2) summary(args.get(1));
+                else throw new PizzaBotException("invalid command");
+            }
+            case "check" -> {
+                if (argc == 1) check();
+                else if (argc == 2 && "--all".equals(args.get(1))) checkAll();
+                else if (argc == 2) check(args.get(1));
+                else throw new PizzaBotException("invalid command");
+            }
+            case "pay" -> {
+                if (argc == 1) throw new PizzaBotException("missing argument");
+                else if (argc == 2) pay(toDouble(args.get(1)));
+                else if (argc == 3) pay(args.get(1), toDouble(args.get(2)));
+                else throw new PizzaBotException("too many arguments");
+            }
+            case "payment" -> {
+                if (argc == 1) throw new PizzaBotException("too few arguments");
+                switch (args.get(1)) {
+                    case "confirm" -> {
+                        if (argc == 2) throw new PizzaBotException("too few arguments");
+                        else if (argc == 3 && "--all".equals(args.get(2))) throw new PizzaBotException("missing arguments");
+                        else if (argc == 3) paymentConfirm(toLong(args.get(2)), null);
+                        else if (argc == 4 && "--all".equals(args.get(2))) paymentConfirmAll(args.get(3));
+                        else if (argc == 4) paymentConfirm(toLong(args.get(2)), args.get(3));
+                        else throw new PizzaBotException("invalid command");
+                    }
+                    case "void" -> {
+                        if (argc == 2) throw new PizzaBotException("too few arguments");
+                        else if (argc == 3) paymentVoid(toLong(args.get(2)), null);
+                        else if (argc == 4) paymentVoid(toLong(args.get(2)), args.get(3));
+                        else throw new PizzaBotException("invalid command");
+                    }
+                    default -> throw new PizzaBotException("invalid command");
+                }
+            }
+            default -> throw new PizzaBotException("Unbekannter Befehl.");
+        }
+    }
+
+    private @NotNull User getUser() {
+        if (USER.isBound()) {
+            return USER.get();
+        } else {
+            throw new PizzaBotException("Diese Aktion kann nur mit öffentlicher ID ausgeführt werden.");
+        }
+    }
+
+    //<editor-fold desc="Admin" defaultstate="collapsed">
+    private void runAs(@NotNull List<String> args) throws SQLException {
+        // TODO
+        if (true) throw new PizzaBotException("nicht implementiert");
+
+        if (args.size() < 2) throw new PizzaBotException("missing argument");
+
+        var username = args.get(1);
+//        var user = service.getUserByEventAndName(, username);
+//
+//        ScopedValue.runWhere(USER, user, () -> {
+//            try {
+//                dispatch(args.subList(2, args.size()));
+//            } catch (SQLException ex) {
+//                throw Lombok.sneakyThrow(ex);
+//            }
+//        });
+//
+//        if (false) throw new SQLException();
+    }
+
+    private void orderAdd(@NotNull String targetOrder, @NotNull String newUserName) throws SQLException {
+        var order = service.getCurrentOrder().checkAdminAccess(getUser());
+        var newUser = service.getUserByName(newUserName);
+
+        OrderItem item;
+        Pizza pizza;
+        List<UserWithPayment> users;
+        try {
+            var targetId = Long.parseLong(targetOrder);
+            var detail = service.getItemById(targetId)
+                    .orElseThrow(() -> new PizzaBotException(STR."Die Bestellung mit Nummer \{targetId} existiert nicht."));
+            item = detail.item();
+            pizza = detail.pizza();
+            users = detail.users();
+        } catch (NumberFormatException _) {
+            var user = service.getUserByEventAndName(order.eventId(), targetOrder);
+            try {
+                item = service.getItemByUser(order.id(), user.id())
+                        .orElseThrow(() -> new PizzaBotException(STR."\{user.username()} hat keine Bestellung aufgegeben."));
+                pizza = service.getPizzaById(item.pizzaId()).orElseThrow();
+                users = service.getUsersByItem(item);
+            } catch (NonUniqueResultException ex) {
+                throw new PizzaBotException(STR."\{user.username()} hat mehr als eine Bestellung aufgegeben. Bitte gibt die Positionsnummer an.", ex);
+            }
+        }
+
+        var payed = users.stream().filter(UserWithPayment::payed).map(UserWithPayment::username).toList();
+        if (!payed.isEmpty()) {
+            throw new PizzaBotException(STR."\{join(payed)} \{payed.size() == 1 ? "hat" : "haben"} schon bezahlt.");
+        }
+
+        if (users.stream().anyMatch(u -> u.id() == newUser.id())) {
+            throw new PizzaBotException(STR."\{newUser.username()} nimmt bereits an dieser Bestellung teil.");
+        }
+
+        service.add(item, newUser, false);
+        post(STR."\{newUser.username()} wurde zur Bestellung \{item.id()} (\{pizza.name()}) von \{join(users, UserWithPayment::username)} hinzugefügt.");
+    }
+
+    /**
+     * Zeigt eine Übersicht alle Bestellungen während der Veranstaltung.
+     */
+    private void summaryAll() throws SQLException {
+        var order = service.getCurrentOrder().checkAdminAccess(getUser());
+        summary0(order.eventName(), service.getItemDetailByEvent(order.eventId()));
+    }
+
+    /**
+     * Zeigt eine Übersicht der Positionen der laufenden Bestellung.
+     */
+    private void summary() throws SQLException {
+        var order = service.getCurrentOrder().checkAdminAccess(getUser());
+        summary0(order.name(), service.getItemDetailByOrder(order.id()));
+    }
+
+    /**
+     * Zeigt eine Übersicht der Positionen der Bestellung mit dem angegebenen Namen.
+     */
+    private void summary(@NotNull String name) throws SQLException {
+        var order = service.getCurrentOrder().checkAdminAccess(getUser());
+        var other = service.getOrderByEventAndName(order.eventId(), name);
+        summary0(other.name(), service.getItemDetailByOrder(other.id()));
+    }
+
+    private void summary0(@NotNull String name, @NotNull Collection<OrderItemDetail> details) {
+        var items = details.stream().collect(Collectors.groupingBy(
+                detail -> Pair.of(detail.pizza(), detail.notes()),
+                () -> new TreeMap<>(Comparator.comparing(Pair::first)),
+                Collectors.collectingAndThen(
+                        Collectors.groupingBy(
+                                OrderItemDetail::id,
+                                Collectors.mapping(OrderItemDetail::userName, Collectors.joining("+"))
+                        ),
+                        Map::values
+                )
+        ));
+        var lines = new ArrayList<String>(items.size() + 2);
+        lines.add("Übersicht " + name);
+        lines.add("");
+        if (items.isEmpty()) {
+            lines.add("(keine Einträge)");
+        } else {
+            items.forEach((item, users) -> {
+                var counts = users.stream().collect(Collectors.groupingBy(
+                        Function.identity(),
+                        Collectors.counting()
+                ));
+                var usersString = counts.entrySet().stream()
+                        .sorted(Map.Entry.comparingByKey())
+                        .map(entry -> entry.getValue() == 1 ? entry.getKey() : entry.getValue() + "x " + entry.getKey())
+                        .collect(Collectors.joining(", "));
+                var pizza = item.first().name().toUpperCase(Locale.ROOT);
+                var notes = item.second() != null ? " " + item.second() : "";
+                lines.add(STR."\{tabular(users.size())}x \{pizza}\{notes} (\{usersString})");
+            });
+        }
+        post(String.join("\n", lines));
+    }
+
+    /**
+     * Zeigt die zusammengefasste Rechnung für alle Bestellungen während der Veranstaltung.
+     */
+    private void checkAll() throws SQLException {
+        var order = service.getCurrentOrder().checkAdminAccess(getUser());
+        var details = service.getItemDetailByEvent(order.eventId());
+
+        var tips = details.stream().collect(Collectors.groupingBy(
+                OrderItemDetail::order,
+                Collectors.collectingAndThen(Collectors.toList(), list -> calculateTip(list.getFirst().orderPayment(), list))
+        ));
+
+        var items = details.stream().collect(Collectors.groupingBy(
+                OrderItemDetail::user,
+                Collectors.reducing(Receipt.empty(), item -> item.receipt(tips.get(item.order())), Receipt::sum)
+        ));
+        check0(order.eventName(), tips.values().stream().anyMatch(tip -> tip > 0), items);
+    }
+
+    /**
+     * Zeigt die Rechnung für der laufenden Bestellung.
+     */
+    private void check() throws SQLException {
+        var order = service.getCurrentOrder().checkAdminAccess(getUser());
+        check0(order.order());
+    }
+
+    /**
+     * Zeigt die Rechnung für die Bestellung mit dem angegebenen Namen.
+     */
+    private void check(@NotNull String name) throws SQLException {
+        var order = service.getCurrentOrder().checkAdminAccess(getUser());
+        var other = service.getOrderByEventAndName(order.eventId(), name);
+        check0(other);
+    }
+
+    private static double calculateTip(@Nullable Double payment, List<@NotNull OrderItemDetail> details) {
+        var total = details.stream().mapToDouble(OrderItemDetail::userPrice).sum();
+        return payment == null ? 0 : payment / total;
+    }
+
+    private void check0(@NotNull Order order) throws SQLException {
+        var details = service.getItemDetailByOrder(order.id());
+
+        var tip = calculateTip(order.payment(), details);
+        var items = details.stream().collect(Collectors.groupingBy(
+                OrderItemDetail::user,
+                Collectors.reducing(Receipt.empty(), item -> item.receipt(tip), Receipt::sum)
+        ));
+        check0(order.name(), order.payment() != null, items);
+    }
+
+    private void check0(@NotNull String name, boolean tipped, @NotNull Map<User, @NotNull Receipt> items) {
+        var lines = new ArrayList<String>();
+        lines.add("Rechnung für " + name + (tipped ? " (mit Trinkgeld)" : ""));
+        lines.add("alle Angaben ohne Gewähr");
+        lines.add("");
+        if (items.isEmpty()) {
+            lines.add("(keine Einträge)");
+        } else {
+            var toString = (BiConsumer<String, Receipt>) (user, receipt) -> {
+                if (receipt.payed()) {
+                    lines.add(strikethrough(user + ": " + receipt.totalAsString()));
+                } else if (receipt.unpayed()) {
+                    lines.add(user + ": " + receipt.totalAsString());
+                } else {
+                    lines.add(user + ": " + strikethrough(receipt.totalAsString()) + " " + receipt.pendingAsString());
+                }
+            };
+            items.forEach((user, receipt) -> toString.accept(user.username(), receipt));
+            lines.add("");
+            toString.accept("Gesamt", items.values().stream().reduce(Receipt::sum).orElseThrow());
+        }
+        post(String.join("\n", lines));
+    }
+    
+    private void pay(double amount) throws SQLException {
+        var order = service.getCurrentOrder().checkAdminAccess(getUser());
+        service.save(order.order().withPayment(amount));
+        post(FMT."Zahlung von %.2f\{amount} für \{order.name()} wurde gespeichert");
+    }
+    
+    private void pay(@NotNull String name, double amount) throws SQLException {
+        var order = service.getCurrentOrder().checkAdminAccess(getUser());
+        var other = service.getOrderByEventAndName(order.eventId(), name);
+        service.save(other.withPayment(amount));
+        post(FMT."Zahlung von %.2f\{amount} für \{other.name()} wurde gespeichert");
+    }
+
+//    /**
+//     * Beginnt eine neue Bestellung.
+//     * @param restaurant die Restaurant-ID
+//     */
+//    private void orderStart(@NotNull String restaurant, @NotNull String deadline) {
+//    }
+//
+//    /**
+//     * Beginnt eine neue Bestellung.
+//     * @param restaurantId die Restaurant-ID
+//     */
+//    private void orderStart(long restaurantId, @NotNull String deadline) {
+//        var restaurant = restaurantRepository.getById(restaurantId)
+//                .orElseThrow(() -> new BreakException(STR."Das Restaurant mit der ID \{restaurantId} existiert nicht."));
+//        var order = new Order(-1, , restaurantId, , , null);
+//        orderRepository.save(order);
+//    }
+//
+//    /**
+//     * Beendet eine Bestellung.
+//     * @param payment der gezahlte Betrag inkl. Trinkgeld
+//     */
+//    private void orderFinish(double payment) {
+//        var order = service.getCurrentOrderAsAdmin();
+//        orderRepository.save(order.withPayment(payment));
+//        check(order.id());
+//    }
+
+    /**
+     * Bestätigt den Zahlungseingang für alle ausstehenden Zahlungen der laufenden Veranstaltung eines Benutzers.
+     */
+    private void paymentConfirmAll(@NotNull String name) throws SQLException {
+        var order = service.getCurrentOrder().checkAdminAccess(getUser());
+        var user = service.getUserByEventAndName(order.eventId(), name);
+        var count = service.paymentByEventAndUser(order.eventId(), user.id(), true);
+        post(STR."\{count} ausstehenden Zahlungen für \{user.username()} wurden bestätigt.");
+    }
+
+    /**
+     * Bestätigt den Zahlungseingang für eine Bestellung.
+     */
+    private void paymentConfirm(long itemId, @Nullable String username) throws SQLException {
+        payment0(itemId, username, true, (pizza, user) -> STR."Zahlungseingang für \{pizza} (\{user}) wurde bestätigt.");
+    }
+
+    /**
+     * Widerruft die Bestätigung eines Zahlungseingangs.
+     */
+    private void paymentVoid(long itemId, @Nullable String username) throws SQLException {
+        payment0(itemId, username, false, (pizza, user) -> STR."Zahlungseingang für \{pizza} (\{user}) wurde bestätigt.");
+    }
+
+    private void payment0(long itemId, @Nullable String username, boolean payed, @NotNull BinaryOperator<String> message) throws SQLException {
+        var _ = service.getCurrentOrder().checkAdminAccess(getUser());
+        var summary = service.getItemById(itemId)
+                .orElseThrow(() -> new PizzaBotException(STR."Die Bestellung mit Nummer \{itemId} existiert nicht."));
+        if (username != null) {
+            var users = summary.users().stream().filter(u -> u.username().startsWith(username)).toList();
+            if (users.isEmpty()) {
+                throw new PizzaBotException("Der Benutzer existiert nicht oder hat nicht an der Bestellung teilgenommen.");
+            } else if (users.size() > 1) {
+                throw new PizzaBotException("Der Benutzer ist nicht eindeutig.");
+            } else {
+                var user = users.getFirst();
+                service.paymentByItemAndUser(itemId, user.id(), true);
+                post(message.apply(summary.pizza().name(), user.username()));
+            }
+        } else {
+            service.paymentByItem(summary.item().id(), payed);
+            post(message.apply(summary.pizza().name(), join(" + ", summary.users(), UserWithPayment::username)));
+        }
+    }
+    //</editor-fold>
+
+    //<editor-fold desc="User" defaultstate="collapsed">
+    /**
+     * Zeigt Informationen zur aktuell laufenden Bestellung.
+     */
+    private void info() throws SQLException {
+        var order = service.getCurrentOrder();
+        var result = service.getRestaurantWithPizzas(order.restaurantId());
+        var restaurant = result.first();
+        var pizzas = result.second();
+
+        var lines = new ArrayList<String>();
+        lines.add(STR."Pizzabestellung bei \{restaurant.name()} in \{restaurant.city()}");
+        lines.add(STR."Bestellannahmeschluss: \{DATE_FORMATTER.format(order.deadline())}");
+        pizzas.stream().map(Pizza::toPrettyString).forEach(lines::add);
+        post(String.join("\n", lines));
+    }
+
+    /**
+     * Listet die eigenen Bestellungen auf.
+     */
+    private void orderList() throws SQLException {
+        var user = getUser();
+        var current = service.getCurrentOrder();
+
+        var itemsByOrder = service.getItemDetailByEventAndUser(current.eventId(), user.id()).stream().collect(Collectors.groupingBy(
+                OrderItemDetail::order,
+                TreeMap::new,
+                Collectors.toUnmodifiableList()
+        ));
+
+        var lines = new ArrayList<String>();
+        lines.add("Bestellungen von " + user.username());
+        if (itemsByOrder.isEmpty()) lines.add("(keine Einträge)");
+        itemsByOrder.forEach((order, items) -> {
+            lines.add("");
+            lines.add(order.name());
+            items.stream().map(OrderItemDetail::toPrettyString).forEach(lines::add);
+        });
+        post(String.join("\n", lines));
+    }
+
+    /**
+     * Storniert die einzige eigene Bestellung.
+     */
+    private void orderRevoke() throws SQLException {
+        var order = service.getCurrentOrder().checkDeadline();
+        var user = getUser();
+
+        try {
+            var item = service.getItemByUser(order.id(), user.id());
+            if (item.isEmpty()) {
+                post("Du hast keine Bestellung aufgegeben.");
+            } else {
+                orderRevoke0(item.get());
+            }
+        } catch (NonUniqueResultException ex) {
+            post("Du hast mehr als eine Bestellung aufgegeben. Bitte gib die Positionsnummer oder den Namen der Pizza an.");
+        }
+    }
+
+    /**
+     * Storniert die angegebene, eigene Bestellung.
+     */
+    private void orderRevoke(long itemId) throws SQLException {
+        var order = service.getCurrentOrder().checkDeadline();
+        var item = service.getItemById(itemId);
+        if (item.isEmpty() || item.get().item().orderId() != order.id()) {
+            post(STR."Die Position mit Nummer \{itemId} existiert nicht.");
+        } else {
+            orderRevoke0(item.get().checkUserAccess(getUser()).item());
+        }
+    }
+
+    /**
+     * Storniert die eigene Bestellung der angegebene Pizza.
+     */
+    private void orderRevoke(@NotNull String name) throws SQLException {
+        var order = service.getCurrentOrder().checkDeadline();
+        var user = getUser();
+        try {
+            var item = service.getItemByPizzaName(order.id(), user.id(), name);
+            if (item.isEmpty()) {
+                post("Du hast keine solche Pizza bestellt.");
+            } else {
+                orderRevoke0(item.get());
+            }
+        } catch (NonUniqueResultException ex) {
+            post("Du hast mehr als eine solche Pizza bestellt. Bitte gib die Positionsnummer an.");
+        }
+    }
+
+    private void orderRevoke0(@NotNull OrderItem item) throws SQLException {
+        var pizza = service.getPizzaById(item.pizzaId()).orElseThrow();
+        service.delete(item);
+        post(STR."Die Position \{item.id()} (\{pizza.name()}) wurde storniert.");
+    }
+
+    /**
+     * Storniert alle eigenen Bestellungen.
+     */
+    private void orderRevokeAll() throws SQLException {
+        var order = service.getCurrentOrder().checkDeadline();
+        var user = getUser();
+        var items = service.getItemsByUser(order.id(), user.id());
+        if (items.isEmpty()) {
+            post("Du hast keine Bestellung aufgegeben.");
+        } else {
+            for (var item : items) {
+                service.delete(item);
+            }
+            post("Alle deine Bestellungen wurden storniert.");
+        }
+    }
+
+    /**
+     * Bestellt die Pizza mit dem angegebenen Namen.
+     */
+    private void order(@NotNull String nameOrNummer, @Nullable String notes) throws SQLException {
+        var order = service.getCurrentOrder().checkDeadline();
+        var pizza = service.getPizza(order.restaurantId(), nameOrNummer);
+        order0(order, pizza, notes);
+    }
+
+    private void order0(@NotNull OrderDetail order, @NotNull Pizza pizza, @Nullable String notes) throws SQLException {
+        var id = service.order(order, getUser(), pizza, notes);
+        post(STR."Pizza \{pizza.name()} wurde zur Bestellung hinzugefügt (Positionsnummer \{id}).");
+    }
+    //</editor-fold>
+
+    private void helpUser() {
+        post("""
+             Marek is back!
+             !marek info - Menü anzeigen
+             
+             Bestellung
+             !marek order (NUMMER | NAME) [NOTIZEN] - Pizza bestellen
+             !marek order revoke [NUMMER | NAME | --all] - Bestellung(en) stornieren
+             !marek order list - Bestellungen auflisten
+             """);
+    }
+
+    private void helpAdmin() {
+        post("""
+             !marek --user USER order (NUMMER | NAME) [NOTIZEN] - Pizza bestellen
+             !marek --user USER order revoke [NUMMER | NAME | --all] - Bestellung(en) stornieren
+             !marek --user USER order list - Bestellungen auflisten
+             
+             !marek summary [NAME | --all] - Bestellübersicht
+             !marek check [NAME | --all] - Rechnung anzeigen
+             !marek pay [NAME] AMOUNT - Rechnungsbetrag angeben
+             !marek order list --all - Alle Bestellungen auflisten
+             !marek order add (NUMMER | NAME) USER - Fügt USER zur Bestellung mit Nummer NUMMER / von NAME hinzu
+             
+             !marek payment confirm NUMMER [USER] - Zahlungseingang bestätigen
+             !marek payment confirm --all USER - Zahlungseingang bestätigen
+             !marek payment void NUMMER [USER] - Widerruf der Bestätigung des Zahlungseingangs
+             """);
+    }
+
+    @Override
+    protected void post(@NotNull String message, @Nullable String name, @Nullable Boolean bottag, @Nullable Boolean publicId) {
+        var annoyance = ANNOYANCE.orElse(0d);
+        if (annoyance == 0) {
+            super.post(message, name, bottag, publicId);
+        } else if (annoyance == 1) {
+            super.post(message.toUpperCase(Locale.ROOT), name, bottag, publicId);
+        } else {
+            var infuriatedMessage = message.codePoints()
+                    .map(chr -> Math.random() < annoyance ? Character.toUpperCase(chr) : chr)
+                    .collect(StringBuilder::new, StringBuilder::appendCodePoint, StringBuilder::append)
+                    .toString();
+            super.post(infuriatedMessage, name, bottag, publicId);
+        }
+    }
+
+    private boolean isPrimaryChannel(@NotNull String channel) {
+        return primaryChannels == null || primaryChannels.contains(channel);
+    }
+}

bots/pizza-bot/src/main/java/eu/jonahbauer/chat/bot/pizza/PizzaBotException.java

@@ -0,0 +1,7 @@
+package eu.jonahbauer.chat.bot.pizza;
+
+import lombok.experimental.StandardException;
+
+@StandardException
+public class PizzaBotException extends RuntimeException {
+}

bots/pizza-bot/src/main/java/eu/jonahbauer/chat/bot/pizza/PizzaService.java

@@ -0,0 +1,298 @@
+package eu.jonahbauer.chat.bot.pizza;
+
+import eu.jonahbauer.chat.bot.database.Database;
+import eu.jonahbauer.chat.bot.database.NonUniqueResultException;
+import eu.jonahbauer.chat.bot.pizza.model.*;
+import eu.jonahbauer.chat.bot.pizza.model.table.*;
+import eu.jonahbauer.chat.bot.pizza.model.view.OrderDetail;
+import eu.jonahbauer.chat.bot.pizza.model.view.OrderItemDetail;
+import eu.jonahbauer.chat.bot.pizza.util.Pair;
+import org.intellij.lang.annotations.Language;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.sql.SQLException;
+import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
+
+public class PizzaService {
+    private final @NotNull Database database;
+
+    public PizzaService(@NotNull Database database) {
+        this.database = Objects.requireNonNull(database);
+    }
+
+    public @NotNull OrderDetail getCurrentOrder() throws SQLException {
+        @Language("SQL")
+        var query = "SELECT * FROM order_detail WHERE active = TRUE ORDER BY deadline DESC LIMIT 1";
+        return database.executeUniqueQuery(OrderDetail.class, query)
+                .orElseThrow(() -> new PizzaBotException("Aktuell läuft keine Pizzabestellung."));
+    }
+
+    public @NotNull Pair<@NotNull Restaurant, @NotNull List<@NotNull Pizza>> getRestaurantWithPizzas(long restaurantId) throws SQLException {
+        return database.transaction(() -> {
+            var restaurant = database.findById(Restaurant.class, restaurantId).orElseThrow();
+            var pizzas = database.findAllWhere(Pizza.class, Pizza.Fields.restaurantId, restaurantId);
+            return Pair.of(restaurant, pizzas);
+        });
+    }
+
+    // Payment
+
+    public void save(@NotNull Order order) throws SQLException {
+        database.update(order);
+    }
+
+    public @NotNull User getUserByName(@NotNull String name) throws SQLException {
+        try {
+            @Language("SQL")
+            var query = """
+                    SELECT "user".* FROM "user"
+                    WHERE "user"."username" LIKE ?
+                    """;
+            return database.executeUniqueQuery(User.class, query, stmt -> stmt.setString(1, name + "%"))
+                    .orElseThrow(() -> new PizzaBotException("Der Benutzer existiert nicht."));
+        } catch (NonUniqueResultException _) {
+            throw new PizzaBotException("Der Benutzer ist nicht eindeutig.");
+        }
+    }
+
+    public @NotNull User getUserByEventAndName(long eventId, @NotNull String name) throws SQLException {
+        try {
+            @Language("SQL")
+            var query = """
+                    SELECT "user".* FROM "user"
+                    WHERE "user"."username" LIKE ?
+                        AND EXISTS(
+                            SELECT * FROM "order_item_to_user"
+                                JOIN "order_item" ON "order_item_to_user"."order_item_id" = "order_item"."id"
+                                JOIN "order" ON "order_item"."order_id" = "order"."id"
+                            WHERE "order_item_to_user"."user_id" = "user"."id"
+                                AND "order"."event_id" = ?
+                        )
+                    """;
+            return database.executeUniqueQuery(User.class, query, stmt -> {
+                stmt.setString(1, name + "%");
+                stmt.setLong(2, eventId);
+            }).orElseThrow(() -> new PizzaBotException("Der Benutzer existiert nicht oder hat an keiner Pizzabestellung teilgenommen."));
+        } catch (NonUniqueResultException _) {
+            throw new PizzaBotException("Der Benutzer ist nicht eindeutig.");
+        }
+    }
+
+    public void paymentByItem(long itemId, boolean payed) throws SQLException {
+        database.executeUpdate("UPDATE order_item_to_user SET payed = ? WHERE order_item_id = ?", stmt -> {
+            stmt.setBoolean(1, payed);
+            stmt.setLong(2, itemId);
+        });
+    }
+
+    public int paymentByEventAndUser(long eventId, long userId, boolean payed) throws SQLException {
+        @Language("SQL")
+        var query = """
+                  UPDATE "order_item_to_user"
+                  SET "payed" = ?
+                  WHERE "order_item_to_user"."user_id" = ?
+                      AND EXISTS(
+                          SELECT *
+                          FROM "order_item"
+                              JOIN "order" ON "order_item"."order_id" = "order"."id"
+                          WHERE "order"."event_id" = ? AND "order_item"."id" = "order_item_to_user"."order_item_id"
+                      )
+                  """;
+        return database.executeUpdate(query, stmt -> {
+            stmt.setBoolean(1, payed);
+            stmt.setLong(2, userId);
+            stmt.setLong(3, eventId);
+        });
+    }
+
+    public void paymentByItemAndUser(long itemId, long userId, boolean payed) throws SQLException {
+        database.executeUpdate("UPDATE order_item_to_user SET payed = ? WHERE order_item_id = ? AND user_id = ?", stmt -> {
+            stmt.setBoolean(1, payed);
+            stmt.setLong(2, itemId);
+            stmt.setLong(3, userId);
+        });
+    }
+
+    // Order
+
+    public @NotNull Optional<Pizza> getPizzaById(long id) throws SQLException {
+        return database.findById(Pizza.class, id);
+    }
+
+    public @NotNull Pizza getPizza(long restaurantId, @NotNull String nameOrNummer) throws SQLException {
+        try {
+            var nummer = Integer.parseInt(nameOrNummer);
+            return getPizzaByNummer(restaurantId, nummer);
+        } catch (NumberFormatException _) {
+            return getPizzaByName(restaurantId, nameOrNummer);
+        }
+    }
+
+    private @NotNull Pizza getPizzaByNummer(long restaurantId, int nummer) throws SQLException {
+        @Language("SQL")
+        var query = "SELECT * FROM pizza WHERE restaurant_id = ? AND number = ?";
+        return database.executeUniqueQuery(Pizza.class, query, stmt -> {
+            stmt.setLong(1, restaurantId);
+            stmt.setInt(2, nummer);
+        }).orElseThrow(() -> new PizzaBotException("Diese Pizza kenne ich nicht."));
+    }
+
+    private @NotNull Pizza getPizzaByName(long restaurantId, @NotNull String name) throws SQLException {
+        try {
+            @Language("SQL")
+            var query = "SELECT * FROM pizza WHERE restaurant_id = ? AND name LIKE ?";
+            return database.executeUniqueQuery(Pizza.class, query, stmt -> {
+                stmt.setLong(1, restaurantId);
+                stmt.setString(2, name + "%");
+            }).orElseThrow(() -> new PizzaBotException("Diese Pizza kenne ich nicht."));
+        } catch (NonUniqueResultException _) {
+            throw new PizzaBotException("Diese Pizza kenne ich nicht.");
+        }
+    }
+
+    public long order(@NotNull OrderDetail order, @NotNull User user, @NotNull Pizza pizza, @Nullable String notes) throws SQLException {
+        return database.transaction(() -> {
+            try {
+                database.insert(user);
+            } catch (SQLException _) {}
+
+            var item = new OrderItem(-1, order.id(), pizza.id(), notes);
+            var itemId = database.insert(item);
+
+            var mapping = new OrderItemToUser(itemId, user.id(), false);
+            database.insert(mapping);
+
+            return itemId;
+        });
+    }
+
+    public void add(@NotNull OrderItem item, @NotNull User user, boolean payed) throws SQLException {
+        database.insert(new OrderItemToUser(item.id(), user.id(), payed));
+    }
+
+    public @NotNull List<@NotNull UserWithPayment> getUsersByItem(@NotNull OrderItem item) throws SQLException {
+        @Language("SQL")
+        var query = """
+            SELECT
+                "user"."id" AS "id",
+                "user"."username" AS "username",
+                "order_item_to_user"."order_item_id" AS "order_item_id",
+                "order_item_to_user"."payed" AS "payed"
+            FROM "user"
+                JOIN "order_item_to_user" ON "user"."id" = "order_item_to_user"."user_id"
+            WHERE "order_item_to_user"."order_item_id" = ?
+            """;
+        return database.executeQuery(UserWithPayment.class, query, stmt -> stmt.setLong(1, item.id()));
+    }
+
+    // Revoke
+
+    public @NotNull Optional<OrderItemSummary> getItemById(long itemId) throws SQLException {
+        return database.transaction(() -> {
+            var item = database.findById(OrderItem.class, itemId);
+            if (item.isEmpty()) return Optional.empty();
+
+            var pizza = database.findById(Pizza.class, item.get().pizzaId()).orElseThrow();
+            var users = getUsersByItem(item.get());
+
+            return Optional.of(new OrderItemSummary(item.get(), pizza, users));
+        });
+    }
+
+    public @NotNull Optional<OrderItem> getItemByPizzaName(long orderId, long userId, @NotNull String name) throws SQLException {
+        @Language("SQL")
+        var query = """
+            SELECT "order_item".*
+            FROM "order_item"
+                JOIN "pizza" ON "order_item"."pizza_id" = "pizza"."id"
+                JOIN "order_item_to_user" ON "order_item"."id" = "order_item_to_user"."order_item_id"
+            WHERE "order_item"."order_id" = ? AND "order_item_to_user"."user_id" = ? AND "pizza"."name" LIKE ?
+            """;
+        return database.executeUniqueQuery(OrderItem.class, query, stmt -> {
+            stmt.setLong(1, orderId);
+            stmt.setLong(2, userId);
+            stmt.setString(3, name + "%");
+        });
+    }
+
+    public @NotNull Optional<OrderItem> getItemByUser(long orderId, long userId) throws SQLException {
+        @Language("SQL")
+        var query  = """
+            SELECT "order_item".*
+            FROM "order_item"
+                JOIN "order_item_to_user" ON "order_item"."id" = "order_item_to_user"."order_item_id"
+            WHERE "order_item"."order_id" = ? AND "order_item_to_user"."user_id" = ?
+            """;
+        return database.executeUniqueQuery(OrderItem.class, query, stmt -> {
+            stmt.setLong(1, orderId);
+            stmt.setLong(2, userId);
+        });
+    }
+
+    public @NotNull List<@NotNull OrderItem> getItemsByUser(long orderId, long userId) throws SQLException {
+        @Language("SQL")
+        var query = """
+                    SELECT "order_item".*
+                    FROM "order_item"
+                        JOIN "order_item_to_user" ON "order_item"."id" = "order_item_to_user"."order_item_id"
+                    WHERE "order_item"."order_id" = ? AND "order_item_to_user"."user_id" = ?
+                    """;
+        return database.executeQuery(OrderItem.class, query, stmt -> {
+            stmt.setLong(1, orderId);
+            stmt.setLong(2, userId);
+        });
+    }
+
+    public boolean delete(@NotNull OrderItem item) throws SQLException {
+        return database.delete(OrderItem.class, item.id());
+    }
+
+    // Summary
+
+    public @NotNull Order getOrderByEventAndName(long eventId, @NotNull String name) throws SQLException {
+        try {
+            @Language("SQL")
+            var query = """
+                SELECT "order".*
+                FROM "order"
+                WHERE "order"."event_id" = ? AND "order"."name" LIKE ?
+                """;
+
+            return database.executeUniqueQuery(Order.class, query, stmt -> {
+                stmt.setLong(1, eventId);
+                stmt.setString(2, name + "%");
+            }).orElseThrow(() -> new PizzaBotException("Diese Bestellung kenne ich nicht."));
+        } catch (NonUniqueResultException ex) {
+            throw new PizzaBotException("Die Bestellung ist nicht eindeutig.");
+        }
+    }
+
+    // Order List
+
+    public @NotNull List<@NotNull OrderItemDetail> getItemDetailByEvent(long eventId) throws SQLException {
+        return database.findAllWhere(OrderItemDetail.class, OrderItemDetail.Fields.eventId, eventId);
+    }
+
+    public @NotNull List<@NotNull OrderItemDetail> getItemDetailByOrder(long orderId) throws SQLException {
+        return database.findAllWhere(OrderItemDetail.class, OrderItemDetail.Fields.orderId, orderId);
+    }
+
+    public @NotNull List<@NotNull OrderItemDetail> getItemDetailByEventAndUser(long eventId, long userId) throws SQLException {
+        @Language("SQL")
+        var query = """
+            SELECT *
+            FROM order_item_detail
+            WHERE event_id = ? AND EXISTS(
+                SELECT * FROM "order_item_to_user"
+                WHERE "user_id" = ? AND "order_item_id" = "order_item_detail"."id"
+            )
+            """;
+        return database.executeQuery(OrderItemDetail.class, query, stmt -> {
+            stmt.setLong(1, eventId);
+            stmt.setLong(2, userId);
+        });
+    }
+}

bots/pizza-bot/src/main/java/eu/jonahbauer/chat/bot/pizza/model/OrderItemSummary.java

@@ -0,0 +1,18 @@
+package eu.jonahbauer.chat.bot.pizza.model;
+
+import eu.jonahbauer.chat.bot.pizza.PizzaBotException;
+import eu.jonahbauer.chat.bot.pizza.model.table.OrderItem;
+import eu.jonahbauer.chat.bot.pizza.model.table.Pizza;
+import eu.jonahbauer.chat.bot.pizza.model.table.User;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.List;
+
+public record OrderItemSummary(@NotNull OrderItem item, @NotNull Pizza pizza, @NotNull List<UserWithPayment> users) {
+    public @NotNull OrderItemSummary checkUserAccess(@NotNull User user) {
+        if (users.stream().noneMatch(u -> u.id() == user.id())) {
+            throw new PizzaBotException("Du bist nicht berechtigt, diese Bestellung zu bearbeiten.");
+        }
+        return this;
+    }
+}

bots/pizza-bot/src/main/java/eu/jonahbauer/chat/bot/pizza/model/OrderItemToUser.java

@@ -0,0 +1,14 @@
+package eu.jonahbauer.chat.bot.pizza.model;
+
+import lombok.experimental.FieldNameConstants;
+
+@FieldNameConstants
+public record OrderItemToUser(long orderItemId, long userId, long parts, boolean payed) {
+    public OrderItemToUser(long orderItemId, long userId, boolean payed) {
+        this(orderItemId, userId, 1, payed);
+    }
+
+    public OrderItemToUser withPayed(boolean payed) {
+        return new OrderItemToUser(orderItemId, userId, parts, payed);
+    }
+}

bots/pizza-bot/src/main/java/eu/jonahbauer/chat/bot/pizza/model/Receipt.java

@@ -0,0 +1,40 @@
+package eu.jonahbauer.chat.bot.pizza.model;
+
+import org.jetbrains.annotations.NotNull;
+
+import static eu.jonahbauer.chat.bot.pizza.util.FormatUtils.tabular;
+
+public record Receipt(double total, double tipped, double pending, double pendingTipped) {
+    public Receipt(double total, boolean payed, double tip) {
+        this(total, total * tip, payed ? 0 : total, payed ? 0 : total * tip);
+    }
+
+    public boolean payed() {
+        return pending == 0;
+    }
+
+    public boolean unpayed() {
+        return total == pending;
+    }
+
+    public @NotNull String totalAsString() {
+        return tabular(total, 0) + " €" + (tipped != 0 ? " (" + tabular(tipped, 0) + " €)" : "");
+    }
+
+    public @NotNull String pendingAsString() {
+        return tabular(pending, 0) + " €" + (pendingTipped != 0 ? " (" + tabular(pendingTipped, 0) + " €)" : "");
+    }
+
+    public static @NotNull Receipt empty() {
+        return new Receipt(0, 0, 0, 0);
+    }
+
+    public static @NotNull Receipt sum(@NotNull Receipt first, @NotNull Receipt second) {
+        return new Receipt(
+                first.total + second.total,
+                first.tipped + second.tipped,
+                first.pending + second.pending,
+                first.pendingTipped + second.pendingTipped
+        );
+    }
+}

bots/pizza-bot/src/main/java/eu/jonahbauer/chat/bot/pizza/model/UserWithPayment.java

@@ -0,0 +1,7 @@
+package eu.jonahbauer.chat.bot.pizza.model;
+
+import org.jetbrains.annotations.NotNull;
+
+public record UserWithPayment(long id, @NotNull String username, long orderItemId, boolean payed) {
+    
+}

bots/pizza-bot/src/main/java/eu/jonahbauer/chat/bot/pizza/model/table/Event.java

@@ -0,0 +1,9 @@
+package eu.jonahbauer.chat.bot.pizza.model.table;
+
+import eu.jonahbauer.chat.bot.database.Entity;
+import lombok.experimental.FieldNameConstants;
+import org.jetbrains.annotations.NotNull;
+
+@FieldNameConstants
+public record Event(long id, @NotNull String name, long adminId, boolean active) implements Entity<Event> {
+}

bots/pizza-bot/src/main/java/eu/jonahbauer/chat/bot/pizza/model/table/Order.java

@@ -0,0 +1,33 @@
+package eu.jonahbauer.chat.bot.pizza.model.table;
+
+import eu.jonahbauer.chat.bot.database.Entity;
+import lombok.experimental.FieldNameConstants;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.time.Instant;
+import java.util.Objects;
+
+@FieldNameConstants
+public record Order(
+        long id,
+        long eventId,
+        long restaurantId,
+        @NotNull String name,
+        @NotNull Instant deadline,
+        @Nullable Double payment
+) implements Entity<Order>, Comparable<Order> {
+
+    public Order {
+        Objects.requireNonNull(deadline);
+    }
+
+    public @NotNull Order withPayment(@Nullable Double payment) {
+        return new Order(id, eventId, restaurantId, name, deadline, payment);
+    }
+
+    @Override
+    public int compareTo(@NotNull Order o) {
+        return this.deadline.compareTo(o.deadline);
+    }
+}

bots/pizza-bot/src/main/java/eu/jonahbauer/chat/bot/pizza/model/table/OrderItem.java

@@ -0,0 +1,14 @@
+package eu.jonahbauer.chat.bot.pizza.model.table;
+
+import eu.jonahbauer.chat.bot.database.Entity;
+import lombok.experimental.FieldNameConstants;
+import org.jetbrains.annotations.Nullable;
+
+@FieldNameConstants
+public record OrderItem(
+        long id,
+        long orderId,
+        long pizzaId,
+        @Nullable String notes
+) implements Entity<OrderItem> {
+}

bots/pizza-bot/src/main/java/eu/jonahbauer/chat/bot/pizza/model/table/Pizza.java

@@ -0,0 +1,33 @@
+package eu.jonahbauer.chat.bot.pizza.model.table;
+
+import eu.jonahbauer.chat.bot.database.Entity;
+import lombok.experimental.FieldNameConstants;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Locale;
+
+import static eu.jonahbauer.chat.bot.pizza.util.FormatUtils.tabular;
+
+@FieldNameConstants
+public record Pizza(
+        long id,
+        long restaurantId,
+        int number,
+        @NotNull String name,
+        @NotNull String ingredients,
+        double price
+) implements Entity<Pizza>, Comparable<Pizza> {
+
+    public @NotNull String toPrettyString() {
+        var number = tabular(number());
+        var price = tabular(price(), 5);
+        var name = name().toUpperCase(Locale.ROOT);
+        var ingredients = ingredients();
+        return STR."\{number} | \{price} € | \{name} \{ingredients}";
+    }
+
+    @Override
+    public int compareTo(@NotNull Pizza o) {
+        return Integer.compare(number, o.number);
+    }
+}

bots/pizza-bot/src/main/java/eu/jonahbauer/chat/bot/pizza/model/table/Restaurant.java

@@ -0,0 +1,20 @@
+package eu.jonahbauer.chat.bot.pizza.model.table;
+
+import eu.jonahbauer.chat.bot.database.Entity;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.Objects;
+
+public record Restaurant(
+        long id,
+        @NotNull String name,
+        @NotNull String city,
+        @Nullable String phone,
+        @Nullable String notes
+) implements Entity<Restaurant> {
+    public Restaurant {
+        Objects.requireNonNull(name);
+        Objects.requireNonNull(city);
+    }
+}

bots/pizza-bot/src/main/java/eu/jonahbauer/chat/bot/pizza/model/table/User.java

@@ -0,0 +1,13 @@
+package eu.jonahbauer.chat.bot.pizza.model.table;
+
+import lombok.experimental.FieldNameConstants;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Objects;
+
+@FieldNameConstants
+public record User(long id, @NotNull String username) {
+    public User {
+        Objects.requireNonNull(username);
+    }
+}

bots/pizza-bot/src/main/java/eu/jonahbauer/chat/bot/pizza/model/view/OrderDetail.java

@@ -0,0 +1,42 @@
+package eu.jonahbauer.chat.bot.pizza.model.view;
+
+import eu.jonahbauer.chat.bot.pizza.PizzaBotException;
+import eu.jonahbauer.chat.bot.pizza.model.table.Order;
+import eu.jonahbauer.chat.bot.pizza.model.table.User;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.time.Instant;
+
+public record OrderDetail(
+        // Order
+        long id,
+        @NotNull String name,
+        @NotNull Instant deadline,
+        @Nullable Double payment,
+        // Event
+        long eventId,
+        @NotNull String eventName,
+        long adminId,
+        // Restaurant
+        long restaurantId,
+        @NotNull String restaurantName
+) {
+    public @NotNull Order order() {
+        return new Order(id, eventId, restaurantId, name, deadline, payment);
+    }
+
+    public @NotNull OrderDetail checkDeadline() {
+        if (Instant.now().isAfter(deadline())) {
+            throw new PizzaBotException("Du kannst diese Bestellung nicht mehr bearbeiten, da der Bestellannahmeschluss schon vorbei ist.");
+        }
+        return this;
+    }
+
+    public @NotNull OrderDetail checkAdminAccess(@NotNull User user) {
+        if (adminId() != user.id()) {
+            throw new PizzaBotException("Du bist nicht berechtigt, diese Aktion durchzuführen.");
+        }
+        return this;
+    }
+}

bots/pizza-bot/src/main/java/eu/jonahbauer/chat/bot/pizza/model/view/OrderItemDetail.java

@@ -0,0 +1,79 @@
+package eu.jonahbauer.chat.bot.pizza.model.view;
+
+import eu.jonahbauer.chat.bot.pizza.model.Receipt;
+import eu.jonahbauer.chat.bot.pizza.model.table.Order;
+import eu.jonahbauer.chat.bot.pizza.model.table.Pizza;
+import eu.jonahbauer.chat.bot.pizza.model.table.User;
+import lombok.experimental.FieldNameConstants;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.time.Instant;
+import java.util.Locale;
+
+import static eu.jonahbauer.chat.bot.pizza.util.FormatUtils.strikethrough;
+import static eu.jonahbauer.chat.bot.pizza.util.FormatUtils.tabular;
+
+@FieldNameConstants
+public record OrderItemDetail(
+        // OrderItem
+        long id,
+        @Nullable String notes,
+        // Order
+        long orderId,
+        @NotNull String orderName,
+        @NotNull Instant orderDeadline,
+        @Nullable Double orderPayment,
+        // Event
+        long eventId,
+        // Restaurant
+        long restaurantId,
+        @NotNull String restaurantName,
+        // Pizza
+        long pizzaId,
+        int pizzaNumber,
+        @NotNull String pizzaName,
+        double pizzaPrice,
+        // User
+        long userId,
+        @NotNull String userName,
+        long userParts,
+        boolean userPayed,
+        long userCount
+) {
+    public @NotNull Order order() {
+        return new Order(orderId, eventId, restaurantId, orderName, orderDeadline, orderPayment);
+    }
+
+    public @NotNull Pizza pizza() {
+        return new Pizza(pizzaId, restaurantId, pizzaNumber, pizzaName, "N/A", pizzaPrice);
+    }
+
+    public @NotNull User user() {
+        return new User(userId, userName);
+    }
+
+    public @NotNull Receipt receipt(double tip) {
+        return new Receipt(userPrice(), userPayed(), tip);
+    }
+
+    public double userPrice() {
+        return userParts() * pizzaPrice() / userCount();
+    }
+
+    public @NotNull String toPrettyString() {
+        String price;
+        if (userCount() == 1) {
+            price = tabular(pizzaPrice(), 0) + " €";
+        } else {
+            price = tabular(pizzaPrice(), 0) + " € / " + tabular(userCount(), 0) + " = " + tabular(userPrice(), 0) + " €";
+        }
+        if (userPayed()) price = strikethrough(price);
+
+        if (notes() != null) {
+            return STR."\{id()} | \{pizzaName().toUpperCase(Locale.ROOT)} \{notes()} | \{price}";
+        } else {
+            return STR."\{id()} | \{pizzaName().toUpperCase(Locale.ROOT)} | \{price}";
+        }
+    }
+}

bots/pizza-bot/src/main/java/eu/jonahbauer/chat/bot/pizza/util/ArgumentParser.java

@@ -0,0 +1,90 @@
+package eu.jonahbauer.chat.bot.pizza.util;
+
+import eu.jonahbauer.chat.bot.pizza.PizzaBotException;
+import lombok.experimental.UtilityClass;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+@UtilityClass
+public class ArgumentParser {
+    public static @NotNull List<@NotNull String> parse(@NotNull String string) {
+        var list = new ArrayList<String>();
+        var quote = (char) 0;
+        var escaped = false;
+
+        var current = new StringBuilder();
+        var it = string.chars().iterator();
+        while (it.hasNext()) {
+            var chr = (char) it.nextInt();
+            if (escaped) {
+                if (chr != '\n') current.append(chr);
+            } else if (chr == '\\' && quote != '\'') {
+                escaped = true;
+            } else if (quote == 0 && chr == '"') {
+                quote = '"';
+            } else if (quote == 0 && chr == '\'') {
+                quote = '\'';
+            } else if (quote == chr) {
+                quote = 0;
+            } else if (chr == ' ' || chr == '\t') {
+                if (!current.isEmpty()) {
+                    list.add(current.toString());
+                    current.setLength(0);
+                }
+            } else if (chr == '\n') {
+                break;
+            } else {
+                current.append(chr);
+            }
+        }
+
+        if (escaped) {
+            throw new IllegalArgumentException("incomplete escape sequence");
+        } else if (quote != 0) {
+            throw new IllegalArgumentException("incomplete quote");
+        }
+
+        if (!current.isEmpty()) {
+            list.add(current.toString());
+        }
+
+        return Collections.unmodifiableList(list);
+    }
+
+    public static boolean isLong(@NotNull String string) {
+        try {
+            Long.parseLong(string);
+            return true;
+        } catch (NumberFormatException _) {
+            return false;
+        }
+    }
+
+    public static long toLong(@NotNull String string) {
+        try {
+            return Long.parseLong(string);
+        } catch (NumberFormatException ex) {
+            throw new PizzaBotException(string + " ist keine gültige Zahl.");
+        }
+    }
+
+    public static boolean isDouble(@NotNull String string) {
+        try {
+            Double.parseDouble(string);
+            return true;
+        } catch (NumberFormatException _) {
+            return false;
+        }
+    }
+
+    public static double toDouble(@NotNull String string) {
+        try {
+            return Double.parseDouble(string);
+        } catch (NumberFormatException ex) {
+            throw new PizzaBotException(string + " ist keine gültige Zahl.");
+        }
+    }
+}

bots/pizza-bot/src/main/java/eu/jonahbauer/chat/bot/pizza/util/FormatUtils.java

@@ -0,0 +1,81 @@
+package eu.jonahbauer.chat.bot.pizza.util;
+
+import lombok.experimental.UtilityClass;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.TestOnly;
+
+import java.util.List;
+import java.util.Locale;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+
+@UtilityClass
+public class FormatUtils {
+    public static @NotNull String tabular(long number) {
+        return tabular(number, 2);
+    }
+
+    public static @NotNull String tabular(long number, int width) {
+        return tabular(String.format(Locale.ROOT, "%" + (width == 0 ? "" : width) + "d", number));
+    }
+
+    public static @NotNull String tabular(double number) {
+        return tabular(number, 6);
+    }
+
+    public static @NotNull String tabular(double number, int width) {
+        return tabular(String.format(Locale.ROOT, "%" + (width == 0 ? "" : width) + ".2f", number));
+    }
+
+    private static @NotNull String tabular(@NotNull String string) {
+        var out = new StringBuilder();
+        for (int i = 0, length = string.length(); i < length; i++) {
+            var chr = string.charAt(i);
+            if (chr == ' ') {
+                out.append('\u2007'); // figure space
+            } else {
+                out.append('\u2060'); // word-joiner to prevent kerning
+                out.append(chr);
+            }
+        }
+        return out.toString();
+    }
+
+    @SuppressWarnings("UnnecessaryUnicodeEscape")
+    public static @NotNull String strikethrough(@NotNull String string) {
+        var out = new StringBuilder();
+        for (int i = 0, length = string.length(); i < length; i++) {
+            out.append(string.charAt(i)).append('\u0336');
+        }
+        return out.toString();
+    }
+
+    @TestOnly
+    @SuppressWarnings("UnnecessaryUnicodeEscape")
+    public static @NotNull String strip(@NotNull String string) {
+        var out = new StringBuilder();
+        for (int i = 0, length = string.length(); i < length; i++) {
+            var chr = string.charAt(i);
+            if (chr != '\u0336' && chr != '\u0335' && chr != '\u2007' && chr != '\u2060') {
+                out.append(chr);
+            }
+        }
+        return out.toString();
+    }
+
+    public static @NotNull String join(@NotNull List<@NotNull String> strings) {
+        return switch (strings.size()) {
+            case 0 -> "";
+            case 1 -> strings.getFirst();
+            default -> String.join(", ", strings.subList(0, strings.size() - 1)) + " und " + strings.getLast();
+        };
+    }
+
+    public static <T> @NotNull String join(@NotNull List<@NotNull T> items, @NotNull Function<? super T, String> toString) {
+        return join(items.stream().map(toString).toList());
+    }
+
+    public static <T> @NotNull String join(@NotNull String separator, @NotNull List<@NotNull T> items, @NotNull Function<? super T, String> toString) {
+        return items.stream().map(toString).collect(Collectors.joining(separator));
+    }
+}

bots/pizza-bot/src/main/java/eu/jonahbauer/chat/bot/pizza/util/Pair.java

@@ -0,0 +1,9 @@
+package eu.jonahbauer.chat.bot.pizza.util;
+
+import org.jetbrains.annotations.NotNull;
+
+public record Pair<F, S>(F first, S second) {
+    public static <F, S> @NotNull Pair<F, S> of(F first, S second) {
+        return new Pair<>(first, second);
+    }
+}

bots/pizza-bot/src/main/java/module-info.java

@@ -0,0 +1,16 @@
+import eu.jonahbauer.chat.bot.api.ChatBot;
+import eu.jonahbauer.chat.bot.pizza.PizzaBot;
+
+module eu.jonahbauer.chat.bot.pizza {
+    exports eu.jonahbauer.chat.bot.pizza.model.table to eu.jonahbauer.chat.bot.database;
+    exports eu.jonahbauer.chat.bot.pizza.model.view to eu.jonahbauer.chat.bot.database;
+    exports eu.jonahbauer.chat.bot.pizza.model to eu.jonahbauer.chat.bot.database;
+
+    requires eu.jonahbauer.chat.bot.api;
+    requires eu.jonahbauer.chat.bot.database;
+
+    requires org.slf4j;
+    requires static lombok;
+
+    provides ChatBot with PizzaBot;
+}

bots/pizza-bot/src/main/resources/eu/jonahbauer/chat/bot/pizza/init.sql

@@ -0,0 +1,115 @@
+CREATE TABLE "user"
+(
+    "id"   INTEGER PRIMARY KEY,
+    "username" VARCHAR(255) NOT NULL,
+    CONSTRAINT "uq_username" UNIQUE ("username")
+);
+
+CREATE TABLE "restaurant"
+(
+    "id"    INTEGER PRIMARY KEY AUTOINCREMENT,
+    "name"  VARCHAR(255) NOT NULL,
+    "city"  VARCHAR(255) NOT NULL,
+    "phone" VARCHAR(255) NULL DEFAULT NULL,
+    "notes" VARCHAR(255) NULL DEFAULT NULL
+);
+
+CREATE TABLE "pizza"
+(
+    "id"            INTEGER PRIMARY KEY AUTOINCREMENT,
+    "restaurant_id" INTEGER      NOT NULL,
+    "number"        INTEGER      NOT NULL,
+    "name"          VARCHAR(255) NOT NULL,
+    "ingredients"   VARCHAR(255) NOT NULL,
+    "price"         VARCHAR(255) NOT NULL,
+    CONSTRAINT "fk_pizza_restaurant" FOREIGN KEY ("restaurant_id") REFERENCES "restaurant" ("id") ON DELETE CASCADE,
+    CONSTRAINT "uq_pizza_number" UNIQUE ("restaurant_id", "number")
+);
+
+CREATE TABLE "event"
+(
+    "id"       INTEGER PRIMARY KEY AUTOINCREMENT,
+    "name"     VARCHAR(255) NOT NULL,
+    "admin_id" INTEGER      NOT NULL,
+    "active"   BOOLEAN      NOT NULL DEFAULT FALSE,
+    CONSTRAINT "fk_event_admin" FOREIGN KEY ("admin_id") REFERENCES "user" ("id")
+);
+
+CREATE UNIQUE INDEX "uq_event_active" ON "event" ("active")
+    WHERE "active" = TRUE;
+
+CREATE TABLE "order"
+(
+    "id"            INTEGER PRIMARY KEY AUTOINCREMENT,
+    "event_id"      INTEGER      NOT NULL,
+    "restaurant_id" INTEGER      NOT NULL,
+    "name"          VARCHAR(255) NOT NULL,
+    "deadline"      TIMESTAMP    NOT NULL,
+    "payment"       DOUBLE       NULL,
+    CONSTRAINT "fk_order_event" FOREIGN KEY ("event_id") REFERENCES "event" ("id"),
+    CONSTRAINT "fk_order_restaurant" FOREIGN KEY ("restaurant_id") REFERENCES "restaurant" ("id")
+);
+
+CREATE TABLE "order_item"
+(
+    "id"       INTEGER PRIMARY KEY AUTOINCREMENT,
+    "order_id" INTEGER NOT NULL,
+    "pizza_id" INTEGER NOT NULL,
+    "notes"    VARCHAR(255),
+    CONSTRAINT "fk_order_item_order" FOREIGN KEY ("order_id") REFERENCES "order" ("id") ON DELETE CASCADE,
+    CONSTRAINT "fk_order_item_pizza" FOREIGN KEY ("pizza_id") REFERENCES "pizza" ("id")
+);
+
+CREATE TABLE "order_item_to_user"
+(
+    "order_item_id" INTEGER NOT NULL,
+    "user_id"       INTEGER NOT NULL,
+    "parts"         INTEGER NOT NULL DEFAULT 1,
+    "payed"         BOOLEAN NOT NULL DEFAULT FALSE,
+    PRIMARY KEY ("order_item_id", "user_id"),
+    CONSTRAINT "fk_order_item_to_user_order_item" FOREIGN KEY ("order_item_id") REFERENCES "order_item" ("id") ON DELETE CASCADE,
+    CONSTRAINT "fk_order_item_to_user_user_id" FOREIGN KEY ("user_id") REFERENCES "user" ("id")
+);
+
+CREATE VIEW "order_item_detail"
+AS
+SELECT "order_item"."id",
+       "order_item"."notes",
+       "order"."id"                   AS "order_id",
+       "order"."name"                 AS "order_name",
+       "order"."deadline"             AS "order_deadline",
+       "order"."payment"              AS "order_payment",
+       "order"."event_id"             AS "event_id",
+       "restaurant"."id"              AS "restaurant_id",
+       "restaurant"."name"            AS "restaurant_name",
+       "pizza"."id"                   AS "pizza_id",
+       "pizza"."number"               AS "pizza_number",
+       "pizza"."name"                 AS "pizza_name",
+       "pizza"."price"                AS "pizza_price",
+       "order_item_to_user"."user_id" AS "user_id",
+       "order_item_to_user"."payed"   AS "user_payed",
+       "order_item_to_user"."parts"   AS "user_parts",
+       "user"."username"              AS "user_name",
+       (SELECT SUM("parts") FROM "order_item_to_user" WHERE "order_item_id" = "order_item"."id") AS "user_count"
+FROM "order"
+         JOIN "restaurant" ON "order"."restaurant_id" = "restaurant"."id"
+         JOIN "order_item" ON "order"."id" = "order_item"."order_id"
+         JOIN "pizza" ON "order_item"."pizza_id" = "pizza"."id"
+         JOIN "order_item_to_user" ON "order_item"."id" = "order_item_to_user"."order_item_id"
+         JOIN "user" ON "order_item_to_user"."user_id" = "user"."id";
+
+CREATE VIEW "order_detail"
+AS
+SELECT "order"."id",
+       "order"."name",
+       "order"."deadline",
+       "order"."payment",
+       "event"."id" AS "event_id",
+       "event"."name" AS "event_name",
+       "event"."admin_id",
+       "event"."active",
+       "restaurant"."id" AS "restaurant_id",
+       "restaurant"."name" AS "restaurant_name"
+FROM "event"
+    JOIN "order" ON "event"."id" = "order"."event_id"
+    JOIN "restaurant" ON "order"."restaurant_id" = "restaurant"."id";

bots/pizza-bot/src/main/resources/eu/jonahbauer/chat/bot/pizza/restaurants/sonthofen_2023.sql

@@ -0,0 +1,38 @@
+INSERT INTO "restaurant"("name", "city", "phone", "notes")
+VALUES ('Hell''s Pizza', 'Sonthofen', '08321 7881930', '2023');
+
+WITH temp(id) AS (SELECT last_insert_rowid())
+INSERT INTO "pizza"("restaurant_id", "number", "name", "ingredients", "price")
+SELECT * FROM temp CROSS JOIN (
+VALUES (10, 'Pizzabrot', 'mit Tomaten & Knoblauch', 6.50),
+       (11, 'Margherita', 'mit Tomaten, Mozzarella & Basilikum', 9.50),
+       (12, 'Salami', 'mit Tomaten, Mozzarella & Salami (gegen Aufpreis mit Rindersalami)', 10.00),
+       (13, 'Prosciutto', 'mit Tomaten, Mozzarella & Schinken', 10.00),
+       (14, 'Salsiccia', 'mit Tomaten, Mozzarella & scharfer Salami', 9.50),
+       (15, 'Funghi', 'mit Tomaten, Mozzarella & Champignons', 9.50),
+       (16, 'Romana', 'mit Tomaten, Mozzarella, Salami & Champignons', 10.50),
+       (17, 'Hawaii', 'mit Tomaten, Mozzarella, Schinken & Ananas', 10.50),
+       (18, 'Regina', 'mit Tomaten, Mozzarella, Schinken & Champignons', 10.50),
+       (19, 'Toscana', 'mit Tomaten, Mozzarella, Salami, Champignons & Peperoni', 11.00),
+       (20, 'Tonno', 'mit Tomaten, Mozzarella, Thunfisch, Zwiebeln & Oliven', 11.00),
+       (21, 'Quattro Formaggi', 'mit Tomaten & vier Käsesorten', 10.50),
+       (22, 'Calzone', 'mit Tomaten, Mozzarella, Schinken & Champignons', 10.50),
+       (24, 'Diavolo', 'mit Tomaten, Mozzarella, scharfer Salami, Peperoni & Oliven', 11.00),
+       (25, 'Rucoletta', 'mit Tomaten, Mozzarella, Rucola, Tomatenstücken & Parmesan', 11.00),
+       (26, 'Quattro Stagioni', 'mit Tomaten, Mozzarella, Schinken, Salami, Champignons, Artischocken, Sardellen & Oliven', 11.00),
+       (27, 'Vegana', 'mit Tomaten & verschiedenem Gemüse', 10.50),
+       (28, 'Siciliana', 'mit Tomaten, Mozzarella, Peperoni, Kapern, Sardellen, Oliven & Knoblauch', 10.00),
+       (29, 'Rustica', 'mit Tomaten, Mozzarella, Speck, Champignons, Gorgonzola & Knoblauch', 11.00),
+       (30, 'Caprese', 'mit Tomaten, Mozzarella, Tomatenscheiben & Basilikum', 11.00),
+       (31, 'Calabria', 'mit Tomaten, Mozzarella, scharfer Salami, Zwiebeln & original Schafskäse', 12.00),
+       (32, 'Verdura', 'mit Tomaten, Mozzarella, gegrilltem Gemüse & Knoblauch', 12.00),
+       (33, 'Mare', 'mit Tomaten, Meeresfrüchten & Knoblauch', 13.00),
+       (35, 'Mafiosa', 'mit Tomaten, Mozzarella, Speck, scharfer Salami, Champignons, Spinat & Peperoni', 12.00),
+       (36, 'Reale', 'mit Tomaten, Mozzarella, original Parmaschinken, Rucola & Parmesan', 13.90),
+       (38, 'Mediterranea', 'mit Tomatenscheiben, Mozzarella, Thunfisch, Kapern & Rucola', 12.00),
+       (39, 'Tricolore', 'mit Büffel-Mozzarella, Tomatenscheiben & Rucola-Pesto', 13.00),
+       (40, 'Alfio Spezial', 'mit Mozzarella, Tomatenstücken, Salsiccia, Zwiebeln, Parmesan, Oliven & Basilikum', 12.00),
+       (41, 'Allgäuer', 'mit Tomaten, Mozzarella, Speck, Bergkäse, Röstzwiebeln & Knoblauch', 11.50),
+       (42, 'Buon Gustaio', 'mit Tomaten, Mozzarella, Spinat, Gorgonzola & Knoblauch', 11.00),
+       (44, 'Mista', 'mit Tomaten, Mozzarella, Schinken, Salami, Pilzen & Thunfisch', 11.00)
+);

bots/pizza-bot/src/main/resources/eu/jonahbauer/chat/bot/pizza/restaurants/sonthofen_2024.sql

@@ -0,0 +1,46 @@
+-- Hell's Pizza Sonthofen
+-- Stand: Oktober 2023
+INSERT INTO "restaurant"("name", "city", "phone", "notes")
+VALUES ('Hell''s Pizza', 'Sonthofen', '08321 7881930', '2024');
+
+WITH temp(id) AS (SELECT last_insert_rowid())
+INSERT INTO "pizza"("restaurant_id", "number", "name", "ingredients", "price")
+SELECT * FROM temp CROSS JOIN (
+    VALUES (10, 'Pizzabrot', 'mit Tomaten & Knoblauch', 7.00),
+           (11, 'Margherita', 'mit Tomaten, Mozzarella & Basilikum', 10.00),
+           (12, 'Salami', 'mit Tomaten, Mozzarella & Salami (gegen Aufpreis mit Rindersalami)', 10.50),
+           (13, 'Prosciutto', 'mit Tomaten, Mozzarella & Schinken', 10.50),
+           (14, 'Salsiccia', 'mit Tomaten, Mozzarella & scharfer Salami', 10.50),
+           (15, 'Funghi', 'mit Tomaten, Mozzarella & Champignons', 10.00),
+           (16, 'Romana', 'mit Tomaten, Mozzarella, Salami & Champignons', 11.00),
+           (17, 'Hawaii', 'mit Tomaten, Mozzarella, Schinken & Ananas', 11.00),
+           (18, 'Regina', 'mit Tomaten, Mozzarella, Schinken & Champignons', 11.00),
+           (19, 'Toscana', 'mit Tomaten, Mozzarella, Salami, Champignons & Peperoni', 11.50),
+           (20, 'Tonno', 'mit Tomaten, Mozzarella, Thunfisch, Zwiebeln & Oliven', 11.50),
+           (21, 'Quattro Formaggi', 'mit Tomaten & vier Käsesorten', 11.00),
+           (22, 'Calzone', 'mit Tomaten, Mozzarella, Schinken & Champignons', 11.00),
+           (23, 'Capriccio', 'mit Tomaten, Mozzarella, Schinken, Champignons, Artischocken, Eier', 13.00),
+           (24, 'Diavolo', 'mit Tomaten, Mozzarella, scharfer Salami, Peperoni & Oliven', 11.50),
+           (25, 'Rucoletta', 'mit Tomaten, Mozzarella, Rucola, Tomatenstücken & Parmesan', 12.00),
+           (26, 'Quattro Stagioni', 'mit Tomaten, Mozzarella, Schinken, Salami, Champignons, Artischocken, Sardellen & Oliven', 12.90),
+           (27, 'Vegana', 'mit Tomaten & verschiedenem Gemüse', 11.00),
+           (28, 'Siciliana', 'mit Tomaten, Mozzarella, Peperoni, Kapern, Sardellen, Oliven & Knoblauch', 10.50),
+           (29, 'Rustica', 'mit Tomaten, Mozzarella, Speck, Champignons, Gorgonzola & Knoblauch', 11.50),
+           (30, 'Caprese', 'mit Tomaten, Mozzarella, Tomatenscheiben & Basilikum', 11.50),
+           (31, 'Calabria', 'mit Tomaten, Mozzarella, scharfer Salami, Zwiebeln & original Schafskäse', 12.00),
+           (32, 'Verdura', 'mit Tomaten, Mozzarella, gegrilltem Gemüse & Knoblauch', 12.00),
+           (33, 'Mare', 'mit Tomaten, Meeresfrüchten & Knoblauch', 13.50),
+           (34, 'Contadina', 'mit Büffelmozzarella, Parmaschinken Julienne, Champignons & Rucola', 13.90),
+           (35, 'Mafiosa', 'mit Tomaten, Mozzarella, Speck, scharfer Salami, Champignons, Spinat & Peperoni', 12.90),
+           (36, 'Reale', 'mit Tomaten, Mozzarella, original Parmaschinken, Rucola & Parmesan', 14.90),
+           (38, 'Mediterranea', 'mit Tomatenscheiben, Mozzarella, Thunfisch, Kapern & Rucola', 12.90),
+           (39, 'Tricolore', 'mit Büffel-Mozzarella, Tomatenscheiben & Rucola-Pesto', 13.90),
+           (40, 'Alfio Spezial', 'mit Mozzarella, Tomatenstücken, Salsiccia, Zwiebeln, Parmesan, Oliven & Basilikum', 12.90),
+           (41, 'Allgäuer', 'mit Tomaten, Mozzarella, Speck, Bergkäse, Röstzwiebeln & Knoblauch DAS ORIGINAL', 12.90),
+           (42, 'Buon Gustaio', 'mit Tomaten, Mozzarella, Spinat, Gorgonzola & Knoblauch', 11.90),
+           (44, 'Mista', 'mit Tomaten, Mozzarella, Schinken, Salami, Pilzen & Thunfisch', 11.90),
+           (48, 'Cudduruni', 'Tomatenstücken, Zwiebeln, Parmesan, Oliven, Basilikum, Chili-Olivenöl NEU', 13.90),
+           (49, 'Bufalina', 'mit Tomaten, Büffelmozzarella, frischer Basilikum und Olivenöl NEU', 14.90)
+);
+
+

bots/pizza-bot/src/test/java/eu/jonahbauer/chat/bot/pizza/PizzaBotTest.java

@@ -0,0 +1,629 @@
+package eu.jonahbauer.chat.bot.pizza;
+
+import eu.jonahbauer.chat.bot.api.Message.Post;
+import eu.jonahbauer.chat.bot.pizza.model.*;
+import eu.jonahbauer.chat.bot.pizza.model.table.*;
+import eu.jonahbauer.chat.bot.test.MockChat;
+import eu.jonahbauer.chat.bot.database.Database;
+import eu.jonahbauer.chat.bot.test.ChatBotFactoryAccess;
+import org.jetbrains.annotations.NotNull;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.sql.SQLException;
+import java.time.Instant;
+import java.time.LocalDateTime;
+import java.util.Collections;
+import java.util.List;
+import java.util.Locale;
+import java.util.Objects;
+
+import static eu.jonahbauer.chat.bot.pizza.util.FormatUtils.*;
+import static java.util.FormatProcessor.FMT;
+import static org.junit.jupiter.api.Assertions.*;
+
+class PizzaBotTest {
+    @TempDir
+    static Path temp;
+
+    Database database;
+    MockChat chat;
+    PizzaBot bot;
+
+    User admin;
+    User user;
+    User user2;
+
+    Event event;
+    Order order0; // alte bestellung (bestellannahmeschluss vorbei)
+    Order order1; // alte bestellung
+    Order order; // laufende bestellung
+
+    Pizza salami;
+    Pizza margherita;
+
+    @BeforeEach
+    void init() throws IOException, SQLException {
+        var file = Files.createTempFile(temp, "database", ".db");
+        database = new Database("jdbc:sqlite:" + file.toAbsolutePath());
+        run("init.sql");
+        run("restaurants/sonthofen_2023.sql");
+
+        chat = new MockChat();
+        bot = ChatBotFactoryAccess.create(() -> new PizzaBot(Collections.singleton("marek"), database));
+
+        admin = database.save(new User(0, "Admin"));
+        user = database.save(new User(1337, "User1"));
+        user2 = database.save(new User(42, "User2"));
+
+        event = database.save(new Event(0, "Veranstaltung", admin.id(), true));
+        order0 = database.save(new Order(0, event.id(), 1, "28.03.2024", Instant.ofEpochMilli(System.currentTimeMillis() - 3_600_000), 90.0));
+        order1 = database.save(new Order(0, event.id(), 1, "29.03.2024", Instant.ofEpochMilli(System.currentTimeMillis() + 3_600_000), null));
+        order = database.save(new Order(0, event.id(), 1, "30.03.2024", Instant.ofEpochMilli(System.currentTimeMillis() + 7_200_000), null));
+
+        salami = database.findWhere(Pizza.class, Pizza.Fields.name, "Salami").orElseThrow();
+        margherita = database.findWhere(Pizza.class, Pizza.Fields.name, "Margherita").orElseThrow();
+    }
+
+    @AfterEach
+    void print() {
+        for (var message : chat.getMessages()) {
+            System.out.println("\n" + message.name() + "\n" + message.message());
+        }
+    }
+
+    private void run(@NotNull String script) throws SQLException, IOException {
+        try (var conn = database.getConnection()) {
+            var runner = new ScriptRunner(conn, false, true);
+            runner.setLogWriter(null);
+            try (var stream = Objects.requireNonNull(PizzaBot.class.getResourceAsStream(script))) {
+                try (var reader = new InputStreamReader(stream, StandardCharsets.UTF_8)) {
+                    runner.runScript(reader);
+                }
+            }
+        }
+    }
+
+    private void deadline() throws SQLException {
+        database.delete(order);
+        database.delete(order1);
+        order = order0;
+    }
+
+    private void post(@NotNull User user, @NotNull String message) {
+        var post = new Post(0, user.username(), message, "marek", LocalDateTime.now(), 0L, user.id(), user.username(), "ffffff", 0);
+        bot.onMessage(chat, post);
+    }
+
+    @Nested
+    class OrderPizza {
+
+        @Test
+        void orderByPizzaName() throws SQLException {
+            post(user, "!marek order SALAMI");
+
+            var items = database.findAll(OrderItem.class);
+            assertEquals(1, items.size());
+
+            var item = items.getFirst();
+            assertNull(item.notes());
+            assertEquals(order.id(), item.orderId());
+            assertEquals(salami.id(), item.pizzaId());
+
+            var mappings = database.findAll(OrderItemToUser.class);
+            assertEquals(List.of(new OrderItemToUser(item.id(), user.id(), false)), mappings);
+        }
+
+        @Test
+        void orderByPizzaNameWithNotes() throws SQLException {
+            post(user, "!marek order SALAMI Hello World");
+
+            var items = database.findAll(OrderItem.class);
+            assertEquals(1, items.size());
+
+            var item = items.getFirst();
+            assertEquals("Hello World", item.notes());
+            assertEquals(order.id(), item.orderId());
+            assertEquals(salami.id(), item.pizzaId());
+        }
+
+        @Test
+        void orderByPizzaNameFailsAfterDeadline() throws SQLException {
+            deadline();
+            post(user, "!marek order SALAMI");
+
+            var items = database.findAll(OrderItem.class);
+            assertEquals(0, items.size());
+        }
+
+        @Test
+        void orderByPizzaNumber() throws SQLException {
+            post(user, "!marek order 13");
+
+            var items = database.findAll(OrderItem.class);
+            assertEquals(1, items.size());
+
+            var item = items.getFirst();
+            assertNull(item.notes());
+            assertEquals(order.id(), item.orderId());
+
+            var pizza = database.findById(Pizza.class, item.pizzaId());
+            assertTrue(pizza.isPresent());
+            assertEquals("Prosciutto", pizza.get().name());
+        }
+
+        @Test
+        void orderAddById() throws SQLException {
+            var item = database.save(new OrderItem(0, order.id(), salami.id(), null));
+            database.insert(new OrderItemToUser(item.id(), user.id(), false));
+
+            post(admin, STR."!marek order add \{item.id()} \{user2.username()}");
+
+            assertEquals(
+                    List.of(
+                            new OrderItemToUser(item.id(), user.id(), false),
+                            new OrderItemToUser(item.id(), user2.id(), false)
+                    ),
+                    database.findAll(OrderItemToUser.class)
+            );
+        }
+
+        @Test
+        void orderAddByName() throws SQLException {
+            var item = database.save(new OrderItem(0, order.id(), salami.id(), null));
+            database.insert(new OrderItemToUser(item.id(), user.id(), false));
+
+            post(admin, STR."!marek order add \{user.username()} \{user2.username()}");
+
+            assertEquals(
+                    List.of(
+                            new OrderItemToUser(item.id(), user.id(), false),
+                            new OrderItemToUser(item.id(), user2.id(), false)
+                    ),
+                    database.findAll(OrderItemToUser.class)
+            );
+        }
+
+        @Test
+        void orderAddByNameFailsWhenNotUnique() throws SQLException {
+            var item1 = database.save(new OrderItem(0, order.id(), salami.id(), null));
+            database.insert(new OrderItemToUser(item1.id(), user.id(), false));
+            var item2 = database.save(new OrderItem(0, order.id(), salami.id(), null));
+            database.insert(new OrderItemToUser(item2.id(), user.id(), false));
+
+            post(admin, STR."!marek order add \{user.username()} \{user2.username()}");
+
+            assertEquals(
+                    List.of(
+                            new OrderItemToUser(item1.id(), user.id(), false),
+                            new OrderItemToUser(item2.id(), user.id(), false)
+                    ),
+                    database.findAll(OrderItemToUser.class)
+            );
+        }
+
+        @Test
+        void orderAddByIdFailsWhenAlreadyPayed() throws SQLException {
+            var item = database.save(new OrderItem(0, order.id(), salami.id(), null));
+            database.insert(new OrderItemToUser(item.id(), user.id(), false));
+            database.insert(new OrderItemToUser(item.id(), user2.id(), true));
+
+            post(admin, STR."!marek order add \{item.id()} \{admin.username()}");
+
+            assertEquals(
+                    List.of(
+                            new OrderItemToUser(item.id(), user.id(), false),
+                            new OrderItemToUser(item.id(), user2.id(), true)
+                    ),
+                    database.findAll(OrderItemToUser.class)
+            );
+        }
+    }
+
+    @Nested
+    class Revoke {
+
+        @Test
+        void orderRevoke() throws SQLException {
+            var item1 = database.save(new OrderItem(0, order.id(), margherita.id(), null));
+            database.insert(new OrderItemToUser(item1.id(), user.id(), false));
+            var item2 = database.save(new OrderItem(0, order.id(), margherita.id(), null));
+            database.insert(new OrderItemToUser(item2.id(), user2.id(), false));
+
+            post(user, "!marek order revoke");
+
+            var items = database.findAll(OrderItem.class);
+            assertEquals(List.of(item2), items);
+        }
+
+        @Test
+        void orderRevokeFailsAfterDeadline() throws SQLException {
+            deadline();
+
+            var item = database.save(new OrderItem(0, order.id(), margherita.id(), null));
+            database.insert(new OrderItemToUser(item.id(), user.id(), false));
+
+            post(user, "!marek order revoke");
+
+            var items = database.findAll(OrderItem.class);
+            assertEquals(List.of(item), items);
+        }
+
+        @Test
+        void orderRevokeFailsWithMultipleItems() throws SQLException {
+            var item1 = database.save(new OrderItem(0, order.id(), margherita.id(), null));
+            database.insert(new OrderItemToUser(item1.id(), user.id(), false));
+            var item2 = database.save(new OrderItem(0, order.id(), salami.id(), null));
+            database.insert(new OrderItemToUser(item2.id(), user.id(), false));
+
+            post(user, "!marek order revoke");
+
+            var items = database.findAll(OrderItem.class);
+            assertEquals(2, items.size());
+        }
+
+        @Test
+        void orderRevokeFailsWhenItemBelongsToOtherOrder() throws SQLException {
+            var item = database.save(new OrderItem(0, order1.id(), margherita.id(), null));
+            database.insert(new OrderItemToUser(item.id(), user.id(), false));
+
+            post(user, "!marek order revoke");
+
+            var items = database.findAll(OrderItem.class);
+            assertEquals(List.of(item), items);
+        }
+
+        @Test
+        void orderRevokeByNameWithMultipleItems() throws SQLException {
+            var item1 = database.save(new OrderItem(0, order.id(), margherita.id(), null));
+            database.insert(new OrderItemToUser(item1.id(), user.id(), false));
+            var item2 = database.save(new OrderItem(0, order.id(), salami.id(), null));
+            database.insert(new OrderItemToUser(item2.id(), user.id(), false));
+
+            post(user, "!marek order revoke SALAMI");
+
+            var items = database.findAll(OrderItem.class);
+            assertEquals(List.of(item1), items);
+        }
+
+        @Test
+        void orderRevokeByNameFailsWhenItemBelongsToOtherUser() throws SQLException {
+            var item = database.save(new OrderItem(0, order.id(), margherita.id(), null));
+            database.insert(new OrderItemToUser(item.id(), user.id(), false));
+
+            post(user2, "!marek order revoke MARGHERITA");
+
+            var items = database.findAll(OrderItem.class);
+            assertEquals(List.of(item), items);
+        }
+
+        @Test
+        void orderRevokeByNameFailsWhenItemBelongsToOtherOrder() throws SQLException {
+            var item = database.save(new OrderItem(0, order1.id(), margherita.id(), null));
+            database.insert(new OrderItemToUser(item.id(), user.id(), false));
+
+            post(user, "!marek order revoke MARGHERITA");
+
+            var items = database.findAll(OrderItem.class);
+            assertEquals(List.of(item), items);
+        }
+
+        @Test
+        void orderRevokeById() throws SQLException {
+            var item = database.save(new OrderItem(0, order.id(), margherita.id(), null));
+            database.insert(new OrderItemToUser(item.id(), user.id(), false));
+
+            post(user, "!marek order revoke " + item.id());
+
+            var items = database.findAll(OrderItem.class);
+            assertEquals(List.of(), items);
+        }
+
+        @Test
+        void orderRevokeByIdFailsWhenItemBelongsToOtherUser() throws SQLException {
+            var item = database.save(new OrderItem(0, order.id(), margherita.id(), null));
+            database.insert(new OrderItemToUser(item.id(), user.id(), false));
+
+            post(user2, "!marek order revoke " + item.id());
+
+            var items = database.findAll(OrderItem.class);
+            assertEquals(List.of(item), items);
+        }
+
+        @Test
+        void orderRevokeByIdFailsWhenItemBelongsToOtherOrder() throws SQLException {
+            var item = database.save(new OrderItem(0, order1.id(), margherita.id(), null));
+            database.insert(new OrderItemToUser(item.id(), user.id(), false));
+
+            post(user, "!marek order revoke " + item.id());
+
+            var items = database.findAll(OrderItem.class);
+            assertEquals(List.of(item), items);
+        }
+
+        @Test
+        void orderRevokeAll() throws SQLException {
+            var item1 = database.save(new OrderItem(0, order.id(), margherita.id(), null));
+            database.insert(new OrderItemToUser(item1.id(), user.id(), false));
+            var item2 = database.save(new OrderItem(0, order.id(), salami.id(), null));
+            database.insert(new OrderItemToUser(item2.id(), user.id(), false));
+            var item3 = database.save(new OrderItem(0, order.id(), salami.id(), null));
+            database.insert(new OrderItemToUser(item3.id(), user2.id(), false));
+
+            post(user, "!marek order revoke --all");
+
+            var items = database.findAll(OrderItem.class);
+            assertEquals(List.of(item3), items);
+        }
+    }
+
+    @Nested
+    class Payment {
+        OrderItem item;
+        OrderItemToUser itemToUser;
+        OrderItemToUser itemToUser2;
+
+        @BeforeEach
+        void init() throws SQLException {
+            item = database.save(new OrderItem(0, order.id(), margherita.id(), null));
+            itemToUser = database.save(new OrderItemToUser(item.id(), user.id(), false));
+            itemToUser2 = database.save(new OrderItemToUser(item.id(), user2.id(), false));
+        }
+
+        @Test
+        void paymentConfirmById() throws SQLException {
+            post(admin, "!marek payment confirm " + item.id());
+
+            var mappings = database.findAll(OrderItemToUser.class);
+            assertEquals(List.of(itemToUser.withPayed(true), itemToUser2.withPayed(true)), mappings);
+        }
+
+        @Test
+        void paymentConfirmByIdFailsWhenNotAdmin() throws SQLException {
+            post(user, "!marek payment confirm " + item.id());
+
+            var mappings = database.findAll(OrderItemToUser.class);
+            assertEquals(List.of(itemToUser, itemToUser2), mappings);
+        }
+
+        @Test
+        void paymentConfirmByIdAndUser() throws SQLException {
+            post(admin, "!marek payment confirm " + item.id() + " " + user.username());
+
+            var mappings = database.findAll(OrderItemToUser.class);
+            assertEquals(List.of(itemToUser.withPayed(true), itemToUser2), mappings);
+        }
+
+        @Test
+        void paymentConfirmByIdAndUserFailsWhenNotAdmin() throws SQLException {
+            post(user, "!marek payment confirm " + item.id() + " " + user.username());
+
+            var mappings = database.findAll(OrderItemToUser.class);
+            assertEquals(List.of(itemToUser, itemToUser2), mappings);
+        }
+
+        @Test
+        void paymentConfirmByUser() throws SQLException {
+            var item2 = database.save(new OrderItem(0, order.id(), salami.id(), null));
+            var item2ToUser = database.save(new OrderItemToUser(item2.id(), user.id(), false));
+            var item2ToUser2 = database.save(new OrderItemToUser(item2.id(), user2.id(), false));
+
+            post(admin, "!marek payment confirm --all " + user.username());
+
+            var mappings = database.findAll(OrderItemToUser.class);
+            assertEquals(
+                    List.of(itemToUser.withPayed(true), itemToUser2, item2ToUser.withPayed(true), item2ToUser2),
+                    mappings
+            );
+        }
+    }
+
+    @Nested
+    class Pay {
+        @Test
+        void pay() throws SQLException {
+            post(admin, "!marek pay 42.5");
+
+            var order = database.findById(Order.class, PizzaBotTest.this.order.id());
+            assertTrue(order.isPresent());
+            assertEquals(42.5, order.get().payment());
+        }
+
+        @Test
+        void payFailsWhenNotAdmin() throws SQLException {
+            post(user, "!marek pay 42.5");
+
+            var order = database.findById(Order.class, PizzaBotTest.this.order.id());
+            assertTrue(order.isPresent());
+            assertEquals(PizzaBotTest.this.order, order.get());
+        }
+
+        @Test
+        void payWithOrderName() throws SQLException {
+            post(admin, "!marek pay " + order0.name() + " 42.5");
+
+            var order0 = database.findById(Order.class, PizzaBotTest.this.order0.id());
+            assertTrue(order0.isPresent());
+            assertEquals(42.5, order0.get().payment());
+
+            var order = database.findById(Order.class, PizzaBotTest.this.order.id());
+            assertTrue(order.isPresent());
+            assertNull(order.get().payment());
+        }
+    }
+
+    @Nested
+    class CheckAndSummary {
+        OrderItem item1;
+        OrderItemToUser item1ToUser;
+
+        OrderItem item2;
+        OrderItemToUser item2ToUser;
+
+        OrderItem item3;
+        OrderItemToUser item3ToUser;
+
+        OrderItem item4;
+        OrderItemToUser item4ToUser2;
+
+        OrderItem item5;
+        OrderItemToUser item5ToUser;
+        OrderItemToUser item5ToUser2;
+
+        @BeforeEach
+        void init() throws SQLException {
+            item1 = database.save(new OrderItem(0, order0.id(), margherita.id(), null));
+            item1ToUser = database.save(new OrderItemToUser(item1.id(), user.id(), false));
+
+            item2 = database.save(new OrderItem(0, order.id(), margherita.id(), null));
+            item2ToUser = database.save(new OrderItemToUser(item2.id(), user.id(), false));
+
+            item3 = database.save(new OrderItem(0, order.id(), salami.id(), null));
+            item3ToUser = database.save(new OrderItemToUser(item3.id(), user.id(), false));
+
+            item4 = database.save(new OrderItem(0, order.id(), margherita.id(), null));
+            item4ToUser2 = database.save(new OrderItemToUser(item4.id(), user2.id(), false));
+
+            item5 = database.save(new OrderItem(0, order.id(), margherita.id(), null));
+            item5ToUser = database.save(new OrderItemToUser(item5.id(), user.id(), false));
+            item5ToUser2 = database.save(new OrderItemToUser(item5.id(), user2.id(), false));
+        }
+
+        @Test
+        void check() {
+            post(admin, "!marek check");
+            var message = chat.getMessages().getFirst();
+            var expected = FMT."""
+                       Rechnung für %s\{order.name()}
+                       alle Angaben ohne Gewähr
+
+                       %s\{user.username()}: %.2f\{1.5 * margherita.price() + salami.price()} €
+                       %s\{user2.username()}: %.2f\{1.5 * margherita.price()} €
+
+                       Gesamt: %.2f\{3 * margherita.price() + salami.price()} €
+                       """.trim();
+            assertEquals(expected, strip(message.message()));
+        }
+
+        @Test
+        void checkTip() throws SQLException {
+            database.update(order.withPayment(40d));
+
+            post(admin, "!marek check");
+            var message = chat.getMessages().getFirst();
+            var expected = FMT."""
+                       Rechnung für %s\{order.name()} (mit Trinkgeld)
+                       alle Angaben ohne Gewähr
+
+                       %s\{user.username()}: %.2f\{1.5 * margherita.price() + salami.price()} € (25.19 €)
+                       %s\{user2.username()}: %.2f\{1.5 * margherita.price()} € (14.81 €)
+
+                       Gesamt: %.2f\{3 * margherita.price() + salami.price()} € (40.00 €)
+                       """.trim();
+            assertEquals(expected, strip(message.message()));
+        }
+
+        @Test
+        void checkPayed() throws SQLException {
+            database.executeUpdate("UPDATE order_item_to_user SET payed = TRUE WHERE user_id = " + user.id());
+
+            post(admin, "!marek check");
+            var message = chat.getMessages().getFirst();
+            var expected = FMT."""
+                       Rechnung für %s\{order.name()}
+                       alle Angaben ohne Gewähr
+
+                       %s\{user.username()}: %.2f\{1.5 * margherita.price() + salami.price()} €
+                       %s\{user2.username()}: %.2f\{1.5 * margherita.price()} €
+
+                       Gesamt: %.2f\{3 * margherita.price() + salami.price()} € %.2f\{1.5 * margherita.price()} €
+                       """.trim();
+            assertEquals(expected, strip(message.message()));
+            assertEquals(strikethrough("User1: " + tabular(1.5 * margherita.price() + salami.price(), 0) + " €"), message.message().split("\n")[3]);
+        }
+
+        @Test
+        void checkPartialPayed() throws SQLException {
+            database.executeUpdate("UPDATE order_item_to_user SET payed = TRUE WHERE order_item_id = " + item5.id());
+
+            var user1Total = 1.5 * margherita.price() + salami.price();
+            var user1Remaining = margherita.price() + salami.price();
+            var user2Total = 1.5 * margherita.price();
+            var user2Remaining = margherita.price();
+
+            post(admin, "!marek check");
+            var message = chat.getMessages().getFirst();
+            var expected = FMT."""
+                       Rechnung für %s\{order.name()}
+                       alle Angaben ohne Gewähr
+
+                       %s\{user.username()}: %.2f\{user1Total} € %.2f\{user1Remaining} €
+                       %s\{user2.username()}: %.2f\{user2Total} € %.2f\{user2Remaining} €
+
+                       Gesamt: %.2f\{user1Total + user2Total} € %.2f\{user1Remaining + user2Remaining} €
+                       """.trim();
+            assertEquals(expected, strip(message.message()));
+            assertEquals(
+                    STR."\{user.username()}: \{strikethrough(tabular(user1Total, 0)+ " €")} \{tabular(user1Remaining, 0)} €",
+                    message.message().split("\n")[3]
+            );
+            assertEquals(
+                    STR."\{user2.username()}: \{strikethrough(tabular(user2Total, 0)+ " €")} \{tabular(user2Remaining, 0)} €",
+                    message.message().split("\n")[4]
+            );
+        }
+
+        @Test
+        void checkAllTip() throws SQLException {
+            database.update(order.withPayment(40d));
+
+            post(admin, "!marek check --all");
+            var message = chat.getMessages().getFirst();
+            var expected = FMT."""
+                       Rechnung für %s\{event.name()} (mit Trinkgeld)
+                       alle Angaben ohne Gewähr
+
+                       %s\{user.username()}: %.2f\{2.5 * margherita.price() + salami.price()} € (115.19 €)
+                       %s\{user2.username()}: %.2f\{1.5 * margherita.price()} € (14.81 €)
+
+                       Gesamt: %.2f\{4 * margherita.price() + salami.price()} € (130.00 €)
+                       """.trim();
+            assertEquals(expected, strip(message.message()));
+        }
+
+        @Test
+        void summary() {
+            post(admin, "!marek summary");
+            var message = chat.getMessages().getFirst();
+            var expected = FMT."""
+                       Übersicht %s\{order.name()}
+
+                       3x \{margherita.name().toUpperCase(Locale.ROOT)} (\{user.username()}, \{user.username()}+\{user2.username()}, \{user2.username()})
+                       1x \{salami.name().toUpperCase(Locale.ROOT)} (\{user.username()})
+                       """.trim();
+            assertEquals(expected, strip(message.message()));
+        }
+
+        @Test
+        void summaryAll() {
+            post(admin, "!marek summary --all");
+            var message = chat.getMessages().getFirst();
+            var expected = FMT."""
+                       Übersicht %s\{event.name()}
+
+                       4x \{margherita.name().toUpperCase(Locale.ROOT)} (2x \{user.username()}, \{user.username()}+\{user2.username()}, \{user2.username()})
+                       1x \{salami.name().toUpperCase(Locale.ROOT)} (\{user.username()})
+                       """.trim();
+            assertEquals(expected, strip(message.message()));
+        }
+    }
+
+}

bots/pizza-bot/src/test/java/eu/jonahbauer/chat/bot/pizza/ScriptRunner.java

@@ -0,0 +1,248 @@
+package eu.jonahbauer.chat.bot.pizza;
+/*
+ * Slightly modified version of the com.ibatis.common.jdbc.ScriptRunner class
+ * from the iBATIS Apache project. Only removed dependency on Resource class
+ * and a constructor 
+ */
+/*
+ *  Copyright 2004 Clinton Begin
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+import java.io.IOException;
+import java.io.LineNumberReader;
+import java.io.PrintWriter;
+import java.io.Reader;
+import java.sql.*;
+
+/**
+ * Tool to run database scripts
+ */
+@SuppressWarnings("all")
+public class ScriptRunner {
+
+	private static final String DEFAULT_DELIMITER = ";";
+
+	private Connection connection;
+
+	private boolean stopOnError;
+	private boolean autoCommit;
+
+	private PrintWriter logWriter = new PrintWriter(System.out);
+	private PrintWriter errorLogWriter = new PrintWriter(System.err);
+
+	private String delimiter = DEFAULT_DELIMITER;
+	private boolean fullLineDelimiter = false;
+
+	/**
+	 * Default constructor
+	 */
+	public ScriptRunner(Connection connection, boolean autoCommit,
+			boolean stopOnError) {
+		this.connection = connection;
+		this.autoCommit = autoCommit;
+		this.stopOnError = stopOnError;
+	}
+
+	public void setDelimiter(String delimiter, boolean fullLineDelimiter) {
+		this.delimiter = delimiter;
+		this.fullLineDelimiter = fullLineDelimiter;
+	}
+
+	/**
+	 * Setter for logWriter property
+	 * 
+	 * @param logWriter
+	 *            - the new value of the logWriter property
+	 */
+	public void setLogWriter(PrintWriter logWriter) {
+		this.logWriter = logWriter;
+	}
+
+	/**
+	 * Setter for errorLogWriter property
+	 * 
+	 * @param errorLogWriter
+	 *            - the new value of the errorLogWriter property
+	 */
+	public void setErrorLogWriter(PrintWriter errorLogWriter) {
+		this.errorLogWriter = errorLogWriter;
+	}
+
+	/**
+	 * Runs an SQL script (read in using the Reader parameter)
+	 * 
+	 * @param reader
+	 *            - the source of the script
+	 */
+	public void runScript(Reader reader) throws IOException, SQLException {
+		try {
+			boolean originalAutoCommit = connection.getAutoCommit();
+			try {
+				if (originalAutoCommit != this.autoCommit) {
+					connection.setAutoCommit(this.autoCommit);
+				}
+				runScript(connection, reader);
+			} finally {
+				connection.setAutoCommit(originalAutoCommit);
+			}
+		} catch (IOException e) {
+			throw e;
+		} catch (SQLException e) {
+			throw e;
+		} catch (Exception e) {
+			throw new RuntimeException("Error running script.  Cause: " + e, e);
+		}
+	}
+
+	/**
+	 * Runs an SQL script (read in using the Reader parameter) using the
+	 * connection passed in
+	 * 
+	 * @param conn
+	 *            - the connection to use for the script
+	 * @param reader
+	 *            - the source of the script
+	 * @throws SQLException
+	 *             if any SQL errors occur
+	 * @throws IOException
+	 *             if there is an error reading from the Reader
+	 */
+	private void runScript(Connection conn, Reader reader) throws IOException,
+			SQLException {
+		StringBuffer command = null;
+		try {
+			LineNumberReader lineReader = new LineNumberReader(reader);
+			String line = null;
+			while ((line = lineReader.readLine()) != null) {
+				if (command == null) {
+					command = new StringBuffer();
+				}
+				String trimmedLine = line.trim();
+				if (trimmedLine.startsWith("--")) {
+					println(trimmedLine);
+				} else if (trimmedLine.length() < 1
+						|| trimmedLine.startsWith("//")) {
+					// Do nothing
+				} else if (trimmedLine.length() < 1
+						|| trimmedLine.startsWith("--")) {
+					// Do nothing
+				} else if (!fullLineDelimiter
+						&& trimmedLine.endsWith(getDelimiter())
+						|| fullLineDelimiter
+						&& trimmedLine.equals(getDelimiter())) {
+					command.append(line.substring(0, line
+							.lastIndexOf(getDelimiter())));
+					command.append(" ");
+					Statement statement = conn.createStatement();
+
+					println(command);
+
+					boolean hasResults = false;
+					if (stopOnError) {
+						hasResults = statement.execute(command.toString());
+					} else {
+						try {
+							statement.execute(command.toString());
+						} catch (SQLException e) {
+							e.fillInStackTrace();
+							printlnError("Error executing: " + command);
+							printlnError(e);
+						}
+					}
+
+					if (autoCommit && !conn.getAutoCommit()) {
+						conn.commit();
+					}
+
+					ResultSet rs = statement.getResultSet();
+					if (hasResults && rs != null) {
+						ResultSetMetaData md = rs.getMetaData();
+						int cols = md.getColumnCount();
+						for (int i = 0; i < cols; i++) {
+							String name = md.getColumnLabel(i);
+							print(name + "\t");
+						}
+						println("");
+						while (rs.next()) {
+							for (int i = 0; i < cols; i++) {
+								String value = rs.getString(i);
+								print(value + "\t");
+							}
+							println("");
+						}
+					}
+
+					command = null;
+					try {
+						statement.close();
+					} catch (Exception e) {
+						// Ignore to workaround a bug in Jakarta DBCP
+					}
+					Thread.yield();
+				} else {
+					command.append(line);
+					command.append(" ");
+				}
+			}
+			if (!autoCommit) {
+				conn.commit();
+			}
+		} catch (SQLException e) {
+			e.fillInStackTrace();
+			printlnError("Error executing: " + command);
+			printlnError(e);
+			throw e;
+		} catch (IOException e) {
+			e.fillInStackTrace();
+			printlnError("Error executing: " + command);
+			printlnError(e);
+			throw e;
+		} finally {
+			conn.rollback();
+			flush();
+		}
+	}
+
+	private String getDelimiter() {
+		return delimiter;
+	}
+
+	private void print(Object o) {
+		if (logWriter != null) {
+			System.out.print(o);
+		}
+	}
+
+	private void println(Object o) {
+		if (logWriter != null) {
+			logWriter.println(o);
+		}
+	}
+
+	private void printlnError(Object o) {
+		if (errorLogWriter != null) {
+			errorLogWriter.println(o);
+		}
+	}
+
+	private void flush() {
+		if (logWriter != null) {
+			logWriter.flush();
+		}
+		if (errorLogWriter != null) {
+			errorLogWriter.flush();
+		}
+	}
+}

build.gradle.kts

@@ -0,0 +1,7 @@
+plugins {
+    id("net.researchgate.release") version "3.0.2"
+}
+
+release {
+    failOnUnversionedFiles = false
+}

buildSrc/src/main/kotlin/chat-bot.bot-conventions.gradle.kts

@@ -9,7 +9,7 @@ val libs = versionCatalogs.named("libs")
 
 dependencies {
     implementation(project(":bot-api"))
-    implementation(libs.findLibrary("log4j2-api").get())
+    implementation(libs.findLibrary("slf4j").get())
 }
 
 tasks.withType<JavaCompile> {

buildSrc/src/main/kotlin/chat-bot.java-conventions.gradle.kts

@@ -35,6 +35,15 @@ tasks.withType<Test> {
     jvmArgs("--enable-preview")
 }
 
+tasks.register("deps") {
+    group = "build"
+    description = "resolves all resolvable configurations"
+
+    doLast {
+        configurations.filter { it.isCanBeResolved }.forEach { it.resolve() }
+    }
+}
+
 val application = extensions.findByType<JavaApplication>()
 application?.apply {
     applicationDefaultJvmArgs = listOf("--enable-preview")

buildSrc/src/main/kotlin/eu/jonahbauer/chat/build/jlink/JLinkTask.kt

@@ -0,0 +1,68 @@
+package eu.jonahbauer.chat.build.jlink
+
+import org.gradle.api.DefaultTask
+import org.gradle.api.file.ConfigurableFileCollection
+import org.gradle.api.file.DirectoryProperty
+import org.gradle.api.file.RegularFileProperty
+import org.gradle.api.plugins.JavaPluginExtension
+import org.gradle.api.plugins.internal.JavaPluginHelper
+import org.gradle.api.provider.ListProperty
+import org.gradle.api.tasks.*
+import org.gradle.api.tasks.internal.JavaExecExecutableUtils
+import org.gradle.jvm.toolchain.JavaToolchainService
+import org.gradle.jvm.toolchain.internal.JavaExecutableUtils
+import org.gradle.kotlin.dsl.getByType
+
+abstract class JLinkTask : DefaultTask() {
+    @get:OutputDirectory
+    abstract val output : DirectoryProperty
+
+    @get:InputFile
+    abstract val executable : RegularFileProperty
+
+    @get:InputFiles
+    abstract val modulePath : ConfigurableFileCollection
+
+    @get:Input
+    abstract val modules : ListProperty<String>
+
+    @get:Input
+    abstract val options : ListProperty<String>
+
+    init {
+        group = "distribution"
+        description = "assembles a modular runtime image using jlink"
+
+        output.convention(project.layout.buildDirectory.dir("dist/jre"))
+        modules.convention(listOf("ALL-MODULE-PATH"))
+
+        if (project.pluginManager.hasPlugin("java")) {
+            val feature = JavaPluginHelper.getJavaComponent(project).mainFeature
+            modulePath.from(feature.runtimeClasspathConfiguration)
+            modulePath.from(feature.jarTask)
+
+            val toolchains = project.extensions.getByType(JavaToolchainService::class)
+            val java = project.extensions.getByType(JavaPluginExtension::class)
+
+            executable.convention(toolchains.launcherFor(java.toolchain)
+                    .map { it.metadata.installationPath }
+                    .map { it.dir("bin").file("jlink") })
+        }
+    }
+
+    @TaskAction
+    fun execute() {
+        val args = options.get() + listOf(
+                "--module-path", modulePath.asPath,
+                "--output", output.get().asFile.path,
+                "--add-modules", modules.get().joinToString(",")
+        )
+        val executable = executable.get().asFile.path
+
+        project.delete(output)
+        project.exec {
+            this.executable = executable
+            this.args = args
+        }
+    }
+}

gradle.properties

@@ -0,0 +1 @@
+version=0.2.0-SNAPSHOT

gradle/libs.versions.toml

@@ -1,22 +1,20 @@
 [versions]
 annotations = "24.1.0"
-jackson = "2.16.1"
+gson = "2.10.1"
+hikari = "5.1.0"
 junit = "5.10.2"
-log4j2 = "2.22.1"
+logback = "1.5.3"
 lombok = "1.18.30"
+slf4j = "2.0.12"
+sqlite = "3.44.1.0"
 
 [libraries]
 annotations = { module = "org.jetbrains:annotations", version.ref = "annotations" }
-jackson-annotations = { module = "com.fasterxml.jackson.core:jackson-annotations", version.ref = "jackson"}
+gson = { module = "com.google.code.gson:gson", version.ref = "gson" }
-jackson-databind = { module = "com.fasterxml.jackson.core:jackson-databind", version.ref = "jackson"}
+hikari = { module = "com.zaxxer:HikariCP", version.ref = "hikari" }
-jackson-datatype-jsr310 = { module = "com.fasterxml.jackson.datatype:jackson-datatype-jsr310", version.ref = "jackson"}
+logback = { module = "ch.qos.logback:logback-classic", version.ref = "logback" }
 junit-bom = { module = "org.junit:junit-bom", version.ref = "junit" }
 junit-jupiter = { module = "org.junit.jupiter:junit-jupiter" }
-log4j2-api = { module = "org.apache.logging.log4j:log4j-api", version.ref = "log4j2"}
-log4j2-core = { module = "org.apache.logging.log4j:log4j-core", version.ref = "log4j2"}
-log4j2-slf4j = { module = "org.apache.logging.log4j:log4j-slf4j2-impl", version.ref = "log4j2"}
 lombok = { module = "org.projectlombok:lombok", version.ref = "lombok" }
-
+slf4j = { module = "org.slf4j:slf4j-api", version.ref = "slf4j" }
-[bundles]
+sqlite = { module = "org.xerial:sqlite-jdbc", version.ref = "sqlite"}
-jackson = ["jackson-databind", "jackson-annotations", "jackson-datatype-jsr310"]
-log4j2 = ["log4j2-api", "log4j2-core", "log4j2-slf4j"]

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.5-rc-4-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME

management/build.gradle.kts

@@ -4,7 +4,6 @@ plugins {
 }
 
 group = "eu.jonahbauer.chat"
-version = "0.1.0-SNAPSHOT"
 
 dependencies {
     api(project(":bot-api")) {

management/src/main/java/eu/jonahbauer/chat/server/management/ChatBotSupportMXBean.java

@@ -14,7 +14,7 @@ import java.util.List;
 public interface ChatBotSupportMXBean {
 
     @SneakyThrows
-    static @NotNull ObjectName getObjectName(String name) {
+    static @NotNull ObjectName getObjectName(@NotNull String name) {
         return ObjectName.getInstance(STR."eu.jonahbauer.chat.bot.server:component=ChatBots,name=\{quote(name)}");
     }
 

server/build.gradle.kts

@@ -1,26 +1,45 @@
+import eu.jonahbauer.chat.build.jlink.JLinkTask
+
 plugins {
     id("chat-bot.java-conventions")
-    application
 }
 
 group = "eu.jonahbauer.chat"
-version = "0.1.0-SNAPSHOT"
 
-val bots = project(":bots").subprojects
+val bot : Configuration by configurations.creating
+configurations.runtimeOnly {
+    extendsFrom(bot)
+}
 
 dependencies {
     implementation(project(":bot-api"))
     implementation(project(":management"))
-    implementation(libs.bundles.log4j2)
+    implementation(libs.gson)
-    implementation(libs.bundles.jackson)
+    implementation(libs.slf4j)
+
+    runtimeOnly(libs.logback)
 
-    bots.forEach {
+    project.project(":bots").subprojects.forEach {
-        implementation(project(it.path))
+        bot(project(it.path))
     }
 }
 
-application {
+tasks.named<JavaCompile>("compileJava") {
-    mainClass.set("eu.jonahbauer.chat.server.Main")
+    options.javaModuleMainClass = "eu.jonahbauer.chat.server.Main"
-    mainModule.set("eu.jonahbauer.chat.server")
+}
-    applicationDefaultJvmArgs = listOf("--enable-preview")
+
+tasks.register<JLinkTask>("jlink") {
+    modules = listOf("ALL-MODULE-PATH", "jdk.crypto.ec")
+    options = listOf("--no-header-files", "--no-man-pages", "--strip-debug", "--compress=zip-6")
 }
+
+tasks.register<Exec>("run") {
+    group = "application"
+    description = "runs the application using the custom runtime image"
+
+    executable = project.layout.buildDirectory.file("dist/jre/bin/java").get().asFile.path
+    args("--enable-preview", "-m", "eu.jonahbauer.chat.server")
+
+    dependsOn(tasks.named<JLinkTask>("jlink"))
+}
+

server/src/main/java/eu/jonahbauer/chat/server/Config.java

@@ -1,26 +1,27 @@
 package eu.jonahbauer.chat.server;
 
-import com.fasterxml.jackson.databind.ObjectMapper;
+import com.google.gson.GsonBuilder;
-import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import eu.jonahbauer.chat.bot.config.BotConfig;
-import eu.jonahbauer.chat.server.bot.BotConfigDeserializer;
+import eu.jonahbauer.chat.server.json.BotConfigDeserializer;
+import lombok.extern.slf4j.Slf4j;
 import org.jetbrains.annotations.NotNull;
 
 import java.io.IOException;
+import java.io.InputStreamReader;
 import java.net.URI;
 import java.net.URL;
 import java.util.Map;
 import java.util.Objects;
 import java.util.Set;
 
+@Slf4j
 public record Config(
         @NotNull Account account,
         @NotNull Set<@NotNull String> channels,
-        @JsonDeserialize(contentUsing = BotConfigDeserializer.class)
         @NotNull Map<@NotNull String, @NotNull BotConfig> bots
 ) {
     private static final String CONFIGURATION_FILE_ENV = "CHAT_BOT_CONFIG";
-    private static final String CONFIGURATION_FILE_PROPERTY = "chatbot.configurationFile";
+    private static final String CONFIGURATION_FILE_PROPERTY = "chatbot.configuration";
     private static final String DEFAULT_CONFIGURATION_FILE = "file:./config.json";
 
     public static @NotNull Config load() throws IOException {
@@ -38,8 +39,14 @@ public record Config(
     }
 
     public static @NotNull Config read(@NotNull URL url) throws IOException {
-        var mapper = new ObjectMapper();
+        log.info("Loading configuration from " + url);
-        return mapper.readValue(url, Config.class);
+
+        var gson = new GsonBuilder()
+                .registerTypeAdapter(BotConfig.class, new BotConfigDeserializer())
+                .create();
+        try (var in = url.openStream(); var reader = new InputStreamReader(in)) {
+            return gson.fromJson(reader, Config.class);
+        }
     }
 
     public Config {

server/src/main/java/eu/jonahbauer/chat/server/Main.java

@@ -1,30 +1,32 @@
 package eu.jonahbauer.chat.server;
 
 import eu.jonahbauer.chat.server.bot.ChatBotSupervisor;
-import eu.jonahbauer.chat.server.management.impl.ChatBotManager;
-import eu.jonahbauer.chat.server.management.impl.SocketManager;
 import eu.jonahbauer.chat.server.socket.SocketSupervisor;
+import eu.jonahbauer.chat.server.util.Lazy.MutableLazy;
 
+import javax.management.JMException;
 import java.io.IOException;
 import java.util.concurrent.CountDownLatch;
 
 public class Main {
 
-    public static void main(String[] args) throws IOException, InterruptedException {
+    public static void main(String[] args) throws IOException, InterruptedException, JMException {
-        // initialize ChatBotManager and SocketManager
-        var _ = ChatBotManager.INSTANCE;
-        var _ = SocketManager.INSTANCE;
-
         var config = Config.load();
-        ChatBotSupervisor.INSTANCE.start(config);
+        var chatBotSupervisorLazy = new MutableLazy<ChatBotSupervisor>();
-        SocketSupervisor.INSTANCE.start(config);
+        var socketSupervisorLazy = new MutableLazy<SocketSupervisor>();
+        try (
+                var chatBotSupervisor = chatBotSupervisorLazy.set(new ChatBotSupervisor(socketSupervisorLazy));
+                var socketSupervisor = socketSupervisorLazy.set(new SocketSupervisor(chatBotSupervisorLazy))
+        ) {
+            chatBotSupervisor.start(config);
+            socketSupervisor.start(config);
 
-        try {
+            try {
-            // keep main thread running
+                // keep main thread running
-            new CountDownLatch(1).await();
+                new CountDownLatch(1).await();
-        } catch (InterruptedException e) {
+            } catch (InterruptedException _) {
-            SocketSupervisor.INSTANCE.stop();
+                // ignore
-            ChatBotSupervisor.INSTANCE.stop();
+            }
         }
     }
 }

server/src/main/java/eu/jonahbauer/chat/server/bot/BotConfigDeserializer.java

@@ -1,61 +0,0 @@
-package eu.jonahbauer.chat.server.bot;
-
-import com.fasterxml.jackson.core.JsonParseException;
-import com.fasterxml.jackson.core.JsonParser;
-import com.fasterxml.jackson.core.JsonToken;
-import com.fasterxml.jackson.databind.DeserializationContext;
-import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
-import eu.jonahbauer.chat.bot.config.BotConfig;
-import eu.jonahbauer.chat.bot.config.BotConfigurationException;
-
-import java.io.IOException;
-import java.util.ArrayList;
-
-public class BotConfigDeserializer extends StdDeserializer<BotConfig> {
-
-    protected BotConfigDeserializer() {
-        super(BotConfig.class);
-    }
-
-    @Override
-    public BotConfig deserialize(JsonParser p, DeserializationContext ctxt) throws IOException {
-        if (p.currentToken() == JsonToken.START_OBJECT) {
-            p.nextToken();
-        }
-
-        var builder = BotConfig.builder();
-        while (p.currentToken() == JsonToken.FIELD_NAME) {
-            var key = p.currentName();
-
-            switch (p.nextToken()) {
-                case VALUE_STRING -> builder.value(key, p.getValueAsString());
-                case VALUE_FALSE -> builder.value(key, false);
-                case VALUE_TRUE -> builder.value(key, true);
-                case VALUE_NULL -> {}
-                case VALUE_NUMBER_FLOAT -> builder.value(key, p.getDoubleValue());
-                case VALUE_NUMBER_INT -> builder.value(key, p.getLongValue());
-                case START_ARRAY -> {
-                    var list = new ArrayList<String>();
-                    while (p.nextToken() != JsonToken.END_ARRAY) {
-                        if (p.currentToken() == JsonToken.VALUE_STRING) {
-                            list.add(p.getValueAsString());
-                        } else {
-                            throw new BotConfigurationException("Unsupported property type in array.");
-                        }
-                    }
-                    builder.value(key, list);
-                }
-                case START_OBJECT -> throw new BotConfigurationException("Unsupported property type: object");
-                default -> throw new BotConfigurationException("Unsupported property property type.");
-            }
-
-            p.nextToken();
-        }
-
-        if (p.currentToken() == JsonToken.END_OBJECT) {
-            return builder.build();
-        }
-
-        throw new JsonParseException(p, "Unexpected token: " + p.currentToken(), p.currentLocation());
-    }
-}

server/src/main/java/eu/jonahbauer/chat/server/bot/ChatBotSupervisor.java

@@ -6,32 +6,43 @@ import eu.jonahbauer.chat.bot.config.BotConfig;
 import eu.jonahbauer.chat.bot.impl.BotCreationException;
 import eu.jonahbauer.chat.bot.impl.ChatBotFactory;
 import eu.jonahbauer.chat.server.Config;
+import eu.jonahbauer.chat.server.management.impl.ChatBotManager;
 import eu.jonahbauer.chat.server.management.impl.ChatBotSupport;
 import eu.jonahbauer.chat.server.socket.SocketSupervisor;
-import lombok.extern.log4j.Log4j2;
+import eu.jonahbauer.chat.server.util.Lazy;
+import lombok.extern.slf4j.Slf4j;
 import org.jetbrains.annotations.Blocking;
 import org.jetbrains.annotations.Contract;
 import org.jetbrains.annotations.NonBlocking;
 import org.jetbrains.annotations.NotNull;
 
+import javax.management.JMException;
 import java.time.Duration;
 import java.time.Instant;
 import java.util.*;
 import java.util.concurrent.ArrayBlockingQueue;
 import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
 import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.locks.ReentrantLock;
 
-@Log4j2
+@Slf4j
-public enum ChatBotSupervisor {
+public final class ChatBotSupervisor implements AutoCloseable {
-    INSTANCE;
-
     private static final Duration POST_EXPIRATION = Duration.ofSeconds(2);
     private static final int MESSAGE_QUEUE_SIZE = 10;
 
     /**
      * Map of running bots indexed by their name.
      */
-    private final @NotNull Map<@NotNull String, @NotNull RunningBot> bots = new HashMap<>();
+    private final @NotNull ConcurrentMap<@NotNull String, @NotNull RunningBot> bots = new ConcurrentHashMap<>();
+    private final @NotNull ReentrantLock lock = new ReentrantLock();
+    private final @NotNull Lazy<SocketSupervisor> socketSupervisor;
+
+    public ChatBotSupervisor(@NotNull Lazy<SocketSupervisor> socketSupervisor) throws JMException {
+        ChatBotManager.init(this);
+        this.socketSupervisor = socketSupervisor;
+    }
 
     /**
      * Dispatches the message to all running bots. If a bot has too many messages queued up, the message may not be
@@ -52,9 +63,16 @@ public enum ChatBotSupervisor {
      * @param config a configuration
      * @throws IllegalStateException if any bots are running already
      */
-    public synchronized void start(@NotNull Config config) {
+    public void start(@NotNull Config config) {
-        if (!bots.isEmpty()) throw new IllegalStateException("start(Config) may not be used when any bots are running already");
+        lock.lock();
-        config.bots().forEach(this::start);
+        try {
+            if (!bots.isEmpty()) {
+                throw new IllegalStateException("start(Config) may not be used when any bots are running already");
+            }
+            config.bots().forEach(this::start);
+        } finally {
+            lock.unlock();
+        }
     }
 
     /**
@@ -64,7 +82,7 @@ public enum ChatBotSupervisor {
      * @param channels the channels the bot will be active in
      * @throws BotCreationException if the bot could not be created
      */
-    public synchronized void start(@NotNull String name, @NotNull String type, @NotNull List<String> channels) {
+    public void start(@NotNull String name, @NotNull String type, @NotNull List<String> channels) {
         start(name, BotConfig.builder().type(type).channels(channels).build());
     }
 
@@ -74,9 +92,16 @@ public enum ChatBotSupervisor {
      * @param config the bot configuration
      * @throws BotCreationException if the bot could not be created
      */
-    public synchronized void start(@NotNull String name, @NotNull BotConfig config) {
+    public void start(@NotNull String name, @NotNull BotConfig config) {
-        if (bots.containsKey(name)) throw new BotCreationException("Duplicate bot name: " + name);
+        lock.lock();
-        bots.put(name, new RunningBot(name, config));
+        try {
+            if (bots.containsKey(name)) {
+                throw new BotCreationException("Duplicate bot name: " + name);
+            }
+            bots.put(name, new RunningBot(name, config));
+        } finally {
+            lock.unlock();
+        }
     }
 
     /**
@@ -87,10 +112,13 @@ public enum ChatBotSupervisor {
     public void stop(@NotNull String name) throws InterruptedException {
         RunningBot bot;
 
-        synchronized (this) {
+        lock.lock();
+        try {
             bot = bots.remove(name);
             if (bot == null) return;
             bot.stop();
+        } finally {
+            lock.unlock();
         }
 
         bot.join();
@@ -103,12 +131,15 @@ public enum ChatBotSupervisor {
     public void stop() throws InterruptedException {
         var stopped = new ArrayList<RunningBot>();
 
-        synchronized (this) {
+        lock.lock();
+        try {
             for (RunningBot bot : bots.values()) {
                 stopped.add(bot);
                 bot.stop();
             }
             bots.clear();
+        } finally {
+            lock.unlock();
         }
 
         for (var bot : stopped) {
@@ -116,6 +147,11 @@ public enum ChatBotSupervisor {
         }
     }
 
+    @Override
+    public void close() throws InterruptedException {
+        stop();
+    }
+
     /**
      * {@return a map of all currently running bots and their effective config}
      */
@@ -144,52 +180,31 @@ public enum ChatBotSupervisor {
 
     /**
      * Manages a {@link ChatBot} instance running on its own thread. Takes care of recreating the bot after it threw
-     * an exception. {@linkplain ChatBotSupport#register(String, BotConfig) Registers} the bot during construction
+     * an exception. {@linkplain ChatBotSupport#register(ChatBotSupervisor, String, BotConfig) Registers} the bot
-     * and {@linkplain ChatBotSupport#unregister(String) unregisters} it during {@link #stop()}.
+     * during construction and {@linkplain ChatBotSupport#unregister(String) unregisters} it during {@link #stop()}.
      */
-    private static class RunningBot implements Runnable {
+    private class RunningBot implements Runnable {
         private final @NotNull String name;
-        private final @NotNull BotConfig config;
+        private final @NotNull ChatBot bot;
-        private final @NotNull ChatBotFactory<?> factory;
 
         private final @NotNull Thread thread;
         private final @NotNull BlockingQueue<@NotNull PendingPost> queue = new ArrayBlockingQueue<>(MESSAGE_QUEUE_SIZE);
-        private final AtomicBoolean stopped = new AtomicBoolean();
+        private final @NotNull AtomicBoolean stopped = new AtomicBoolean();
-        private volatile ChatBot bot;
 
         public RunningBot(@NotNull String name, @NotNull BotConfig config) {
             this.name = name;
-            this.config = config;
+
-            this.factory = getChatBotFactory(config.getType());
+            var factory = getChatBotFactory(config.getType());
+            this.bot = factory.create(config);
 
             log.info("starting bot {}...", name);
-            ChatBotSupport.register(name, config);
+            ChatBotSupport.register(ChatBotSupervisor.this, name, config);
             this.thread = Thread.ofVirtual().name("ChatBot[" + name + "]").start(this);
         }
 
         @Override
         public void run() {
             log.info("started bot {}", name);
-            while (!stopped.get()) {
-                var bot = factory.create(config);
-                this.bot = bot;
-                try {
-                    loop(bot);
-                } catch (Exception ex) {
-                    log.warn("bot {} threw an exception and will be recreated", name, ex);
-                    continue;
-                }
-
-                try {
-                    bot.onStop();
-                } catch (Exception ex) {
-                    log.warn("bot {} threw an exception during shutdown", name, ex);
-                }
-            }
-            log.info("stopped bot {}", name);
-        }
-
-        private void loop(@NotNull ChatBot bot) {
             while (!stopped.get()) {
                 try {
                     var post = queue.take();
@@ -200,11 +215,24 @@ public enum ChatBotSupervisor {
                     } else if (!bot.getConfig().getChannels().contains(post.post().channel())) {
                         log.debug("Ignoring message {} because channel is not listened to.", post.post());
                     } else {
-                        bot.onMessage(SocketSupervisor.INSTANCE, post.post());
+                        bot.onMessage(ChatBotSupervisor.this.socketSupervisor.get(), post.post());
                     }
                 } catch (InterruptedException _) {
+                    // ignore
+                } catch (Exception ex) {
+                    log.warn("bot {} threw an exception during message handling", name, ex);
+                } catch (Throwable ex) {
+                    log.error("bot {} threw an error during message handling", name, ex);
                 }
             }
+
+            try {
+                bot.onStop();
+            } catch (Exception ex) {
+                log.warn("bot {} threw an exception during shutdown", name, ex);
+            }
+
+            log.info("stopped bot {}", name);
         }
 
         @NonBlocking
@@ -233,8 +261,7 @@ public enum ChatBotSupervisor {
         }
 
         public @NotNull BotConfig getConfig() {
-            var bot = this.bot;
+            return bot.getConfig();
-            return bot != null ? bot.getConfig() : config;
         }
 
         private record PendingPost(@NotNull Message.Post post, @NotNull Instant expiration) {}

server/src/main/java/eu/jonahbauer/chat/server/json/BooleanTypeAdapter.java

@@ -0,0 +1,30 @@
+package eu.jonahbauer.chat.server.json;
+
+import com.google.gson.TypeAdapter;
+import com.google.gson.stream.JsonReader;
+import com.google.gson.stream.JsonWriter;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.io.IOException;
+
+public class BooleanTypeAdapter extends TypeAdapter<Boolean> {
+    @Override
+    public void write(@NotNull JsonWriter out, @Nullable Boolean value) throws IOException {
+        if (value == null) {
+            out.nullValue();
+        } else {
+            out.value(value ? 1 : 0);
+        }
+    }
+
+    @Override
+    public Boolean read(@NotNull JsonReader in) throws IOException {
+        return switch (in.peek()) {
+            case NUMBER -> in.nextInt() != 0;
+            case BOOLEAN -> in.nextBoolean();
+            case NULL -> null;
+            default -> throw new IllegalStateException("Expected a number but was " + in.peek());
+        };
+    }
+}

server/src/main/java/eu/jonahbauer/chat/server/json/BotConfigDeserializer.java

@@ -0,0 +1,55 @@
+package eu.jonahbauer.chat.server.json;
+
+import com.google.gson.*;
+import eu.jonahbauer.chat.bot.config.BotConfig;
+import eu.jonahbauer.chat.bot.config.BotConfigurationException;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.lang.reflect.Type;
+
+public class BotConfigDeserializer implements JsonDeserializer<BotConfig> {
+
+    @Override
+    public @Nullable BotConfig deserialize(@NotNull JsonElement json, @NotNull Type typeOfT, @NotNull JsonDeserializationContext context) throws JsonParseException {
+        if (json.isJsonNull()) return null;
+        if (!json.isJsonObject()) throw new BotConfigurationException("Expected an object");
+        var obj = json.getAsJsonObject();
+
+        var builder = BotConfig.builder();
+
+        obj.asMap().forEach((key, value) -> {
+            if (value instanceof JsonPrimitive primitive) {
+                if (primitive.isBoolean()) {
+                    builder.value(key, primitive.getAsBoolean());
+                } else if (primitive.isString()) {
+                    builder.value(key, primitive.getAsString());
+                } else if (primitive.isNumber()) {
+                    switch (primitive.getAsNumber()) {
+                        case Long l -> builder.value(key, l);
+                        case Double d -> builder.value(key, d);
+                        case Number n -> throw new BotConfigurationException("Invalid number: " + n);
+                    }
+                } else {
+                    throw new AssertionError();
+                }
+            } else if (value.isJsonArray()) {
+                var list = value.getAsJsonArray().asList().stream()
+                        .map(e -> {
+                            if (e instanceof JsonPrimitive primitive && primitive.isString()) {
+                                return primitive.getAsString();
+                            } else {
+                                throw new BotConfigurationException("Unsupported property type in array.");
+                            }
+                        })
+                        .toList();
+                builder.value(key, list);
+            } else {
+                throw new BotConfigurationException("Unsupported property type.");
+            }
+        });
+
+        return builder.build();
+    }
+
+}

server/src/main/java/eu/jonahbauer/chat/server/json/LocalDateTimeTypeAdapter.java

@@ -0,0 +1,33 @@
+package eu.jonahbauer.chat.server.json;
+
+import com.google.gson.TypeAdapter;
+import com.google.gson.stream.JsonReader;
+import com.google.gson.stream.JsonWriter;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.io.IOException;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+
+public class LocalDateTimeTypeAdapter extends TypeAdapter<LocalDateTime> {
+    private final DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
+
+    @Override
+    public void write(@NotNull JsonWriter out, @Nullable LocalDateTime value) throws IOException {
+        if (value == null) {
+            out.nullValue();
+        } else {
+            out.value(formatter.format(value));
+        }
+    }
+
+    @Override
+    public LocalDateTime read(JsonReader in) throws IOException {
+        return switch (in.peek()) {
+            case NULL -> null;
+            case STRING -> formatter.parse(in.nextString(), LocalDateTime::from);
+            default -> throw new IllegalStateException("Expected a string but was " + in.peek());
+        };
+    }
+}

server/src/main/java/eu/jonahbauer/chat/server/json/RuntimeTypeAdapterFactory.java

@@ -0,0 +1,327 @@
+/*
+ * Copyright (C) 2011 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package eu.jonahbauer.chat.server.json;
+
+import com.google.gson.Gson;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParseException;
+import com.google.gson.JsonPrimitive;
+import com.google.gson.TypeAdapter;
+import com.google.gson.TypeAdapterFactory;
+import com.google.gson.reflect.TypeToken;
+import com.google.gson.stream.JsonReader;
+import com.google.gson.stream.JsonWriter;
+import java.io.IOException;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+/**
+ * Adapts values whose runtime type may differ from their declaration type. This is necessary when a
+ * field's type is not the same type that GSON should create when deserializing that field. For
+ * example, consider these types:
+ *
+ * <pre>{@code
+ * abstract class Shape {
+ *   int x;
+ *   int y;
+ * }
+ * class Circle extends Shape {
+ *   int radius;
+ * }
+ * class Rectangle extends Shape {
+ *   int width;
+ *   int height;
+ * }
+ * class Diamond extends Shape {
+ *   int width;
+ *   int height;
+ * }
+ * class Drawing {
+ *   Shape bottomShape;
+ *   Shape topShape;
+ * }
+ * }</pre>
+ *
+ * <p>Without additional type information, the serialized JSON is ambiguous. Is the bottom shape in
+ * this drawing a rectangle or a diamond?
+ *
+ * <pre>{@code
+ * {
+ *   "bottomShape": {
+ *     "width": 10,
+ *     "height": 5,
+ *     "x": 0,
+ *     "y": 0
+ *   },
+ *   "topShape": {
+ *     "radius": 2,
+ *     "x": 4,
+ *     "y": 1
+ *   }
+ * }
+ * }</pre>
+ *
+ * This class addresses this problem by adding type information to the serialized JSON and honoring
+ * that type information when the JSON is deserialized:
+ *
+ * <pre>{@code
+ * {
+ *   "bottomShape": {
+ *     "type": "Diamond",
+ *     "width": 10,
+ *     "height": 5,
+ *     "x": 0,
+ *     "y": 0
+ *   },
+ *   "topShape": {
+ *     "type": "Circle",
+ *     "radius": 2,
+ *     "x": 4,
+ *     "y": 1
+ *   }
+ * }
+ * }</pre>
+ *
+ * Both the type field name ({@code "type"}) and the type labels ({@code "Rectangle"}) are
+ * configurable.
+ *
+ * <h2>Registering Types</h2>
+ *
+ * Create a {@code RuntimeTypeAdapterFactory} by passing the base type and type field name to the
+ * {@link #of} factory method. If you don't supply an explicit type field name, {@code "type"} will
+ * be used.
+ *
+ * <pre>{@code
+ * RuntimeTypeAdapterFactory<Shape> shapeAdapterFactory
+ *     = RuntimeTypeAdapterFactory.of(Shape.class, "type");
+ * }</pre>
+ *
+ * Next register all of your subtypes. Every subtype must be explicitly registered. This protects
+ * your application from injection attacks. If you don't supply an explicit type label, the type's
+ * simple name will be used.
+ *
+ * <pre>{@code
+ * shapeAdapterFactory.registerSubtype(Rectangle.class, "Rectangle");
+ * shapeAdapterFactory.registerSubtype(Circle.class, "Circle");
+ * shapeAdapterFactory.registerSubtype(Diamond.class, "Diamond");
+ * }</pre>
+ *
+ * Finally, register the type adapter factory in your application's GSON builder:
+ *
+ * <pre>{@code
+ * Gson gson = new GsonBuilder()
+ *     .registerTypeAdapterFactory(shapeAdapterFactory)
+ *     .create();
+ * }</pre>
+ *
+ * Like {@code GsonBuilder}, this API supports chaining:
+ *
+ * <pre>{@code
+ * RuntimeTypeAdapterFactory<Shape> shapeAdapterFactory = RuntimeTypeAdapterFactory.of(Shape.class)
+ *     .registerSubtype(Rectangle.class)
+ *     .registerSubtype(Circle.class)
+ *     .registerSubtype(Diamond.class);
+ * }</pre>
+ *
+ * <h2>Serialization and deserialization</h2>
+ *
+ * In order to serialize and deserialize a polymorphic object, you must specify the base type
+ * explicitly.
+ *
+ * <pre>{@code
+ * Diamond diamond = new Diamond();
+ * String json = gson.toJson(diamond, Shape.class);
+ * }</pre>
+ *
+ * And then:
+ *
+ * <pre>{@code
+ * Shape shape = gson.fromJson(json, Shape.class);
+ * }</pre>
+ */
+public final class RuntimeTypeAdapterFactory<T> implements TypeAdapterFactory {
+  private final Class<?> baseType;
+  private final String typeFieldName;
+  private final Map<String, Class<?>> labelToSubtype = new LinkedHashMap<>();
+  private final Map<Class<?>, String> subtypeToLabel = new LinkedHashMap<>();
+  private final boolean maintainType;
+  private boolean recognizeSubtypes;
+
+  private RuntimeTypeAdapterFactory(Class<?> baseType, String typeFieldName, boolean maintainType) {
+    if (typeFieldName == null || baseType == null) {
+      throw new NullPointerException();
+    }
+    this.baseType = baseType;
+    this.typeFieldName = typeFieldName;
+    this.maintainType = maintainType;
+  }
+
+  /**
+   * Creates a new runtime type adapter using for {@code baseType} using {@code typeFieldName} as
+   * the type field name. Type field names are case sensitive.
+   *
+   * @param maintainType true if the type field should be included in deserialized objects
+   */
+  public static <T> RuntimeTypeAdapterFactory<T> of(
+      Class<T> baseType, String typeFieldName, boolean maintainType) {
+    return new RuntimeTypeAdapterFactory<>(baseType, typeFieldName, maintainType);
+  }
+
+  /**
+   * Creates a new runtime type adapter using for {@code baseType} using {@code typeFieldName} as
+   * the type field name. Type field names are case sensitive.
+   */
+  public static <T> RuntimeTypeAdapterFactory<T> of(Class<T> baseType, String typeFieldName) {
+    return new RuntimeTypeAdapterFactory<>(baseType, typeFieldName, false);
+  }
+
+  /**
+   * Creates a new runtime type adapter for {@code baseType} using {@code "type"} as the type field
+   * name.
+   */
+  public static <T> RuntimeTypeAdapterFactory<T> of(Class<T> baseType) {
+    return new RuntimeTypeAdapterFactory<>(baseType, "type", false);
+  }
+
+  /**
+   * Ensures that this factory will handle not just the given {@code baseType}, but any subtype of
+   * that type.
+   */
+  public RuntimeTypeAdapterFactory<T> recognizeSubtypes() {
+    this.recognizeSubtypes = true;
+    return this;
+  }
+
+  /**
+   * Registers {@code type} identified by {@code label}. Labels are case sensitive.
+   *
+   * @throws IllegalArgumentException if either {@code type} or {@code label} have already been
+   *     registered on this type adapter.
+   */
+  public RuntimeTypeAdapterFactory<T> registerSubtype(Class<? extends T> type, String label) {
+    if (type == null || label == null) {
+      throw new NullPointerException();
+    }
+    if (subtypeToLabel.containsKey(type) || labelToSubtype.containsKey(label)) {
+      throw new IllegalArgumentException("types and labels must be unique");
+    }
+    labelToSubtype.put(label, type);
+    subtypeToLabel.put(type, label);
+    return this;
+  }
+
+  /**
+   * Registers {@code type} identified by its {@link Class#getSimpleName simple name}. Labels are
+   * case sensitive.
+   *
+   * @throws IllegalArgumentException if either {@code type} or its simple name have already been
+   *     registered on this type adapter.
+   */
+  public RuntimeTypeAdapterFactory<T> registerSubtype(Class<? extends T> type) {
+    return registerSubtype(type, type.getSimpleName());
+  }
+
+  @Override
+  public <R> TypeAdapter<R> create(Gson gson, TypeToken<R> type) {
+    if (type == null) {
+      return null;
+    }
+    Class<?> rawType = type.getRawType();
+    boolean handle =
+        recognizeSubtypes ? baseType.isAssignableFrom(rawType) : baseType.equals(rawType);
+    if (!handle) {
+      return null;
+    }
+
+    final TypeAdapter<JsonElement> jsonElementAdapter = gson.getAdapter(JsonElement.class);
+    final Map<String, TypeAdapter<?>> labelToDelegate = new LinkedHashMap<>();
+    final Map<Class<?>, TypeAdapter<?>> subtypeToDelegate = new LinkedHashMap<>();
+    for (Map.Entry<String, Class<?>> entry : labelToSubtype.entrySet()) {
+      TypeAdapter<?> delegate = gson.getDelegateAdapter(this, TypeToken.get(entry.getValue()));
+      labelToDelegate.put(entry.getKey(), delegate);
+      subtypeToDelegate.put(entry.getValue(), delegate);
+    }
+
+    return new TypeAdapter<R>() {
+      @Override
+      public R read(JsonReader in) throws IOException {
+        JsonElement jsonElement = jsonElementAdapter.read(in);
+        JsonElement labelJsonElement;
+        if (maintainType) {
+          labelJsonElement = jsonElement.getAsJsonObject().get(typeFieldName);
+        } else {
+          labelJsonElement = jsonElement.getAsJsonObject().remove(typeFieldName);
+        }
+
+        if (labelJsonElement == null) {
+          throw new JsonParseException(
+              "cannot deserialize "
+                  + baseType
+                  + " because it does not define a field named "
+                  + typeFieldName);
+        }
+        String label = labelJsonElement.getAsString();
+        @SuppressWarnings("unchecked") // registration requires that subtype extends T
+        TypeAdapter<R> delegate = (TypeAdapter<R>) labelToDelegate.get(label);
+        if (delegate == null) {
+          throw new JsonParseException(
+              "cannot deserialize "
+                  + baseType
+                  + " subtype named "
+                  + label
+                  + "; did you forget to register a subtype?");
+        }
+        return delegate.fromJsonTree(jsonElement);
+      }
+
+      @Override
+      public void write(JsonWriter out, R value) throws IOException {
+        Class<?> srcType = value.getClass();
+        String label = subtypeToLabel.get(srcType);
+        @SuppressWarnings("unchecked") // registration requires that subtype extends T
+        TypeAdapter<R> delegate = (TypeAdapter<R>) subtypeToDelegate.get(srcType);
+        if (delegate == null) {
+          throw new JsonParseException(
+              "cannot serialize " + srcType.getName() + "; did you forget to register a subtype?");
+        }
+        JsonObject jsonObject = delegate.toJsonTree(value).getAsJsonObject();
+
+        if (maintainType) {
+          jsonElementAdapter.write(out, jsonObject);
+          return;
+        }
+
+        JsonObject clone = new JsonObject();
+
+        if (jsonObject.has(typeFieldName)) {
+          throw new JsonParseException(
+              "cannot serialize "
+                  + srcType.getName()
+                  + " because it already defines a field named "
+                  + typeFieldName);
+        }
+        clone.add(typeFieldName, new JsonPrimitive(label));
+
+        for (Map.Entry<String, JsonElement> e : jsonObject.entrySet()) {
+          clone.add(e.getKey(), e.getValue());
+        }
+        jsonElementAdapter.write(out, clone);
+      }
+    }.nullSafe();
+  }
+}

server/src/main/java/eu/jonahbauer/chat/server/management/impl/AdvancedMBean.java

@@ -4,7 +4,9 @@ import eu.jonahbauer.chat.server.management.annotations.ManagedAttribute;
 import eu.jonahbauer.chat.server.management.annotations.ManagedBean;
 import eu.jonahbauer.chat.server.management.annotations.ManagedOperation;
 import eu.jonahbauer.chat.server.management.annotations.ManagedParameter;
-import lombok.extern.log4j.Log4j2;
+import lombok.extern.slf4j.Slf4j;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 import javax.management.*;
 import java.lang.reflect.Method;
@@ -14,14 +16,14 @@ import java.util.List;
 import java.util.Locale;
 import java.util.function.Function;
 
-@Log4j2
+@Slf4j
-public class AdvancedMBean extends StandardMBean {
+class AdvancedMBean extends StandardMBean {
-    public <T> AdvancedMBean(T implementation) {
+    public AdvancedMBean(@NotNull Object implementation) {
         super(implementation, null, true);
     }
 
     @Override
-    protected String getDescription(MBeanInfo info) {
+    protected @Nullable String getDescription(@Nullable MBeanInfo info) {
         var clazz = getMBeanInterface();
         var annotation = clazz.getAnnotation(ManagedBean.class);
         if (annotation != null && !"".equals(annotation.description())) {
@@ -32,9 +34,7 @@ public class AdvancedMBean extends StandardMBean {
     }
 
     @Override
-    protected int getImpact(MBeanOperationInfo info) {
+    protected int getImpact(@Nullable MBeanOperationInfo info) {
-        if (info == null) return MBeanOperationInfo.UNKNOWN;
-
         var method = findOperation(info);
         var annotation = method != null ? method.getAnnotation(ManagedOperation.class) : null;
         if (annotation != null) {
@@ -45,9 +45,7 @@ public class AdvancedMBean extends StandardMBean {
     }
 
     @Override
-    protected String getDescription(MBeanOperationInfo info) {
+    protected @Nullable String getDescription(@Nullable MBeanOperationInfo info) {
-        if (info == null) return null;
-
         var method = findOperation(info);
         var annotation = method != null ? method.getAnnotation(ManagedOperation.class) : null;
         if (annotation != null && !"".equals(annotation.description())) {
@@ -58,13 +56,9 @@ public class AdvancedMBean extends StandardMBean {
     }
 
     @Override
-    protected String getParameterName(MBeanOperationInfo op, MBeanParameterInfo param, int sequence) {
+    protected @Nullable String getParameterName(@Nullable MBeanOperationInfo op, @Nullable MBeanParameterInfo param, int sequence) {
-        if (op == null) return super.getParameterName(op, param, sequence);
-
         var method = findOperation(op);
-        if (method == null) return super.getParameterName(op, param, sequence);
+        var annotation = method != null ? method.getParameters()[sequence].getAnnotation(ManagedParameter.class) : null;
-
-        var annotation = method.getParameters()[sequence].getAnnotation(ManagedParameter.class);
         if (annotation != null && !"".equals(annotation.name())) {
             return annotation.name();
         } else {
@@ -73,13 +67,9 @@ public class AdvancedMBean extends StandardMBean {
     }
 
     @Override
-    protected String getDescription(MBeanOperationInfo op, MBeanParameterInfo param, int sequence) {
+    protected @Nullable String getDescription(@Nullable MBeanOperationInfo op, @Nullable MBeanParameterInfo param, int sequence) {
-        if (op == null) return super.getParameterName(op, param, sequence);
-
         var method = findOperation(op);
-        if (method == null) return super.getParameterName(op, param, sequence);
+        var annotation = method != null ? method.getParameters()[sequence].getAnnotation(ManagedParameter.class) : null;
-
-        var annotation = method.getParameters()[sequence].getAnnotation(ManagedParameter.class);
         if (annotation != null && !"".equals(annotation.description())) {
             return annotation.description();
         } else {
@@ -88,7 +78,9 @@ public class AdvancedMBean extends StandardMBean {
     }
 
     @Override
-    protected String getDescription(MBeanAttributeInfo info) {
+    protected @Nullable String getDescription(@Nullable MBeanAttributeInfo info) {
+        if (info == null) return super.getDescription(info);
+
         var name = info.getName();
         var type = getType(info, MBeanAttributeInfo::getType);
 
@@ -107,7 +99,7 @@ public class AdvancedMBean extends StandardMBean {
         return super.getDescription(info);
     }
 
-    private <T extends MBeanFeatureInfo> String getType(T info, Function<T, String> getType) {
+    private <T extends MBeanFeatureInfo> String getType(@NotNull T info, @NotNull Function<T, String> getType) {
         var descriptor = info.getDescriptor();
         if (descriptor == null) return getType.apply(info);
 
@@ -119,7 +111,9 @@ public class AdvancedMBean extends StandardMBean {
         }
     }
 
-    private Method findOperation(MBeanOperationInfo info) {
+    private @Nullable Method findOperation(@Nullable MBeanOperationInfo info) {
+        if (info == null) return null;
+
         var name = info.getName();
         var params = new ArrayList<String>();
 
@@ -130,11 +124,11 @@ public class AdvancedMBean extends StandardMBean {
         return findMethod(name, params);
     }
 
-    private Method findMethod(String name, String...parameters) {
+    private @Nullable Method findMethod(@NotNull String name, @NotNull String @NotNull... parameters) {
         return findMethod(name, Arrays.asList(parameters));
     }
 
-    private Method findMethod(String name, List<String> parameters) {
+    private @Nullable Method findMethod(@NotNull String name, @NotNull List<@NotNull String> parameters) {
         var clazz = getMBeanInterface();
         methods: for (var method : clazz.getMethods()) {
             if (!method.getName().equals(name)) continue;
@@ -150,7 +144,7 @@ public class AdvancedMBean extends StandardMBean {
         return null;
     }
 
-    private static String capitalize(String name) {
+    private static @NotNull String capitalize(@NotNull String name) {
         if (name.isEmpty()) return name;
         return name.substring(0, 1).toUpperCase(Locale.ROOT) + name.substring(1);
     }

server/src/main/java/eu/jonahbauer/chat/server/management/impl/ChatBotManager.java

@@ -5,26 +5,31 @@ import eu.jonahbauer.chat.bot.impl.ChatBotFactory;
 import eu.jonahbauer.chat.server.bot.ChatBotSupervisor;
 import eu.jonahbauer.chat.server.management.BotConfigSupport;
 import eu.jonahbauer.chat.server.management.ChatBotManagerMXBean;
-import lombok.SneakyThrows;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Unmodifiable;
 
+import javax.management.JMException;
 import java.lang.management.ManagementFactory;
 import java.util.*;
 import java.util.stream.Collectors;
 
-public enum ChatBotManager implements ChatBotManagerMXBean {
+public final class ChatBotManager implements ChatBotManagerMXBean {
-    INSTANCE;
+    private final @NotNull ChatBotSupervisor supervisor;
 
-    @SneakyThrows
+    public static void init(@NotNull ChatBotSupervisor supervisor) throws JMException {
-    ChatBotManager() {
+        var impl = new ChatBotManager(supervisor);
         var server = ManagementFactory.getPlatformMBeanServer();
-        server.registerMBean(new AdvancedMBean(this), ChatBotManagerMXBean.NAME);
+        server.registerMBean(new AdvancedMBean(impl), ChatBotManagerMXBean.NAME);
+    }
+
+    private ChatBotManager(@NotNull ChatBotSupervisor supervisor) {
+        this.supervisor = Objects.requireNonNull(supervisor);
     }
 
     @Override
     public void start(@NotNull String name, @NotNull String type, @NotNull List<@NotNull String> channels) {
         try {
-            ChatBotSupervisor.INSTANCE.start(name, type, channels);
+            supervisor.start(name, type, channels);
         } catch (BotCreationException ex) {
             throw new IllegalArgumentException(ex.getMessage(), ex.getCause());
         }
@@ -33,7 +38,7 @@ public enum ChatBotManager implements ChatBotManagerMXBean {
     @Override
     public void start(@NotNull String name, @NotNull BotConfigSupport config) {
         try {
-            ChatBotSupervisor.INSTANCE.start(name, config.unwrap());
+            supervisor.start(name, config.unwrap());
         } catch (BotCreationException ex) {
             throw new IllegalArgumentException(ex.getMessage(), ex.getCause());
         }
@@ -41,23 +46,23 @@ public enum ChatBotManager implements ChatBotManagerMXBean {
 
     @Override
     public void stop(@NotNull String name) throws InterruptedException {
-        ChatBotSupervisor.INSTANCE.stop(name);
+        supervisor.stop(name);
     }
 
     @Override
     public void stop() throws InterruptedException {
-        ChatBotSupervisor.INSTANCE.stop();
+        supervisor.stop();
     }
 
     @Override
-    public @NotNull Map<@NotNull String, @NotNull BotConfigSupport> getBots() {
+    public @Unmodifiable @NotNull Map<@NotNull String, @NotNull BotConfigSupport> getBots() {
         var out = new TreeMap<String, BotConfigSupport>();
-        ChatBotSupervisor.INSTANCE.getBots().forEach((key, value) -> out.put(key, new BotConfigSupport(value)));
+        supervisor.getBots().forEach((key, value) -> out.put(key, new BotConfigSupport(value)));
         return Collections.unmodifiableMap(out);
     }
 
     @Override
-    public @NotNull SortedSet<@NotNull String> getBotImplementations() {
+    public @Unmodifiable @NotNull SortedSet<@NotNull String> getBotImplementations() {
         return Collections.unmodifiableSortedSet(
                 ChatBotFactory.implementations().stream()
                         .map(Class::getCanonicalName)

server/src/main/java/eu/jonahbauer/chat/server/management/impl/ChatBotSupport.java

@@ -5,26 +5,30 @@ import eu.jonahbauer.chat.server.bot.ChatBotSupervisor;
 import eu.jonahbauer.chat.server.management.BotConfigSupport;
 import eu.jonahbauer.chat.server.management.ChatBotSupportMXBean;
 import lombok.Getter;
-import lombok.extern.log4j.Log4j2;
+import lombok.extern.slf4j.Slf4j;
+import org.jetbrains.annotations.NotNull;
 
 import java.lang.management.ManagementFactory;
+import java.util.Objects;
 
 @Getter
-@Log4j2
+@Slf4j
-public class ChatBotSupport implements ChatBotSupportMXBean {
+public final class ChatBotSupport implements ChatBotSupportMXBean {
-    private final String name;
+    private final @NotNull ChatBotSupervisor supervisor;
-    private final BotConfigSupport config;
+    private final @NotNull String name;
+    private final @NotNull BotConfigSupport config;
 
-    public static void register(String name, BotConfig config) {
+    public static void register(@NotNull ChatBotSupervisor supervisor, @NotNull String name, @NotNull BotConfig config) {
         try {
+            var impl = new ChatBotSupport(supervisor, name, config);
             var server = ManagementFactory.getPlatformMBeanServer();
-            server.registerMBean(new AdvancedMBean(new ChatBotSupport(name, config)), ChatBotSupportMXBean.getObjectName(name));
+            server.registerMBean(new AdvancedMBean(impl), ChatBotSupportMXBean.getObjectName(name));
         } catch (Exception ex) {
             log.error("Could not register bot as an MBean.", ex);
         }
     }
 
-    public static void unregister(String name) {
+    public static void unregister(@NotNull String name) {
         try {
             var server = ManagementFactory.getPlatformMBeanServer();
             server.unregisterMBean(ChatBotSupportMXBean.getObjectName(name));
@@ -33,12 +37,13 @@ public class ChatBotSupport implements ChatBotSupportMXBean {
         }
     }
 
-    private ChatBotSupport(String name, BotConfig config) {
+    private ChatBotSupport(@NotNull ChatBotSupervisor supervisor, @NotNull String name, @NotNull BotConfig config) {
-        this.name = name;
+        this.supervisor = Objects.requireNonNull(supervisor);
+        this.name = Objects.requireNonNull(name);
         this.config = new BotConfigSupport(config);
     }
 
     public void stop() throws InterruptedException {
-        ChatBotSupervisor.INSTANCE.stop(name);
+        supervisor.stop(name);
     }
 }

server/src/main/java/eu/jonahbauer/chat/server/management/impl/SocketManager.java

@@ -2,43 +2,48 @@ package eu.jonahbauer.chat.server.management.impl;
 
 import eu.jonahbauer.chat.server.management.SocketManagerMXBean;
 import eu.jonahbauer.chat.server.socket.SocketSupervisor;
-import lombok.SneakyThrows;
 import org.jetbrains.annotations.NotNull;
 
+import javax.management.JMException;
 import java.lang.management.ManagementFactory;
+import java.util.Objects;
 import java.util.SortedSet;
 
-public enum SocketManager implements SocketManagerMXBean {
+public final class SocketManager implements SocketManagerMXBean {
-    INSTANCE;
+    private final @NotNull SocketSupervisor supervisor;
 
-    @SneakyThrows
+    public static void init(@NotNull SocketSupervisor supervisor) throws JMException {
-    SocketManager() {
+        var impl = new SocketManager(supervisor);
         var server = ManagementFactory.getPlatformMBeanServer();
-        server.registerMBean(new AdvancedMBean(this), SocketManagerMXBean.NAME);
+        server.registerMBean(new AdvancedMBean(impl), SocketManagerMXBean.NAME);
+    }
+
+    private SocketManager(@NotNull SocketSupervisor supervisor) {
+        this.supervisor = Objects.requireNonNull(supervisor);
     }
 
     @Override
     public void setCredentials(@NotNull String username, @NotNull String password) {
-        SocketSupervisor.INSTANCE.setAccount(username, password);
+        supervisor.setAccount(username, password);
     }
 
     @Override
     public void start(@NotNull String channel) {
-        SocketSupervisor.INSTANCE.start(channel);
+        supervisor.start(channel);
     }
 
     @Override
     public void stop(@NotNull String channel) throws InterruptedException {
-        SocketSupervisor.INSTANCE.stop(channel);
+        supervisor.stop(channel);
     }
 
     @Override
     public void stop() throws InterruptedException {
-        SocketSupervisor.INSTANCE.stop();
+        supervisor.stop();
     }
 
     @Override
     public @NotNull SortedSet<@NotNull String> getChannels() {
-        return SocketSupervisor.INSTANCE.getChannels();
+        return supervisor.getChannels();
     }
 }

server/src/main/java/eu/jonahbauer/chat/server/management/impl/SocketSupport.java

@@ -3,30 +3,32 @@ package eu.jonahbauer.chat.server.management.impl;
 import eu.jonahbauer.chat.server.management.SocketState;
 import eu.jonahbauer.chat.server.management.SocketSupportMXBean;
 import eu.jonahbauer.chat.server.socket.SocketSupervisor;
-import lombok.AccessLevel;
 import lombok.Getter;
-import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
-import lombok.extern.log4j.Log4j2;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 import java.lang.management.ManagementFactory;
 import java.util.Date;
+import java.util.Objects;
 
-@Log4j2
+@Slf4j
 @Getter
-@RequiredArgsConstructor(access = AccessLevel.PRIVATE)
+public final class SocketSupport implements SocketSupportMXBean {
-public class SocketSupport implements SocketSupportMXBean {
+    private final @NotNull SocketSupervisor supervisor;
-    private final String channel;
+    private final @NotNull String channel;
 
-    public static void register(String channel) {
+    public static void register(@NotNull SocketSupervisor supervisor, @NotNull String channel) {
         try {
+            var impl = new SocketSupport(supervisor, channel);
             var server = ManagementFactory.getPlatformMBeanServer();
-            server.registerMBean(new AdvancedMBean(new SocketSupport(channel)), SocketSupportMXBean.getObjectName(channel));
+            server.registerMBean(new AdvancedMBean(impl), SocketSupportMXBean.getObjectName(channel));
         } catch (Exception ex) {
             log.error("Could not register socket as an MBean.", ex);
         }
     }
 
-    public static void unregister(String name) {
+    public static void unregister(@NotNull String name) {
         try {
             var server = ManagementFactory.getPlatformMBeanServer();
             server.unregisterMBean(SocketSupportMXBean.getObjectName(name));
@@ -35,30 +37,35 @@ public class SocketSupport implements SocketSupportMXBean {
         }
     }
 
+    private SocketSupport(@NotNull SocketSupervisor supervisor, @NotNull String channel) {
+        this.supervisor = Objects.requireNonNull(supervisor);
+        this.channel = Objects.requireNonNull(channel);
+    }
+
     @Override
-    public Date getCooldownUntil() {
+    public @Nullable Date getCooldownUntil() {
-        var cooldown = SocketSupervisor.INSTANCE.getCooldownUntil(channel);
+        var cooldown = supervisor.getCooldownUntil(channel);
         return cooldown != null ? Date.from(cooldown) : null;
     }
 
     @Override
-    public SocketState getState() {
+    public @Nullable SocketState getState() {
-        return SocketSupervisor.INSTANCE.getState(channel);
+        return supervisor.getState(channel);
     }
 
 
     @Override
     public void stop() throws InterruptedException {
-        SocketSupervisor.INSTANCE.stop(channel);
+        supervisor.stop(channel);
     }
 
     @Override
     public void restart() {
-        SocketSupervisor.INSTANCE.restart(channel);
+        supervisor.restart(channel);
     }
 
     @Override
-    public void send(String name, String message, boolean bottag, boolean publicid) {
+    public void send(@NotNull String name, @NotNull String message, boolean bottag, boolean publicid) {
-        SocketSupervisor.INSTANCE.send(channel, name, message, bottag, publicid);
+        supervisor.send(channel, name, message, bottag, publicid);
     }
 }

server/src/main/java/eu/jonahbauer/chat/server/socket/OutgoingMessage.java

@@ -1,6 +1,5 @@
 package eu.jonahbauer.chat.server.socket;
 
-import com.fasterxml.jackson.annotation.JsonFormat;
 import org.jetbrains.annotations.NotNull;
 
 import java.util.Objects;
@@ -10,8 +9,8 @@ public record OutgoingMessage(
         @NotNull String message,
         @NotNull String channel,
         long delay,
-        @JsonFormat(shape = JsonFormat.Shape.NUMBER) boolean publicid,
+        boolean publicid,
-        @JsonFormat(shape = JsonFormat.Shape.NUMBER) boolean bottag
+        boolean bottag
 ) {
     public OutgoingMessage {
         Objects.requireNonNull(channel, "channel");

server/src/main/java/eu/jonahbauer/chat/server/socket/SocketSupervisor.java

@@ -1,21 +1,23 @@
 package eu.jonahbauer.chat.server.socket;
 
-import com.fasterxml.jackson.core.JsonProcessingException;
+import com.google.gson.*;
-import com.fasterxml.jackson.databind.ObjectMapper;
-import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
 import eu.jonahbauer.chat.bot.api.Chat;
 import eu.jonahbauer.chat.bot.api.Message;
 import eu.jonahbauer.chat.server.Config;
 import eu.jonahbauer.chat.server.bot.ChatBotSupervisor;
+import eu.jonahbauer.chat.server.json.BooleanTypeAdapter;
+import eu.jonahbauer.chat.server.json.LocalDateTimeTypeAdapter;
+import eu.jonahbauer.chat.server.json.RuntimeTypeAdapterFactory;
 import eu.jonahbauer.chat.server.management.SocketState;
+import eu.jonahbauer.chat.server.management.impl.SocketManager;
 import eu.jonahbauer.chat.server.management.impl.SocketSupport;
+import eu.jonahbauer.chat.server.util.Lazy;
 import lombok.SneakyThrows;
-import lombok.extern.log4j.Log4j2;
+import lombok.extern.slf4j.Slf4j;
-import org.apache.logging.log4j.Level;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
-import java.io.IOException;
+import javax.management.JMException;
 import java.net.CookieManager;
 import java.net.URI;
 import java.net.http.HttpClient;
@@ -25,23 +27,32 @@ import java.net.http.HttpResponse;
 import java.net.http.WebSocket;
 import java.nio.ByteBuffer;
 import java.time.Instant;
+import java.time.LocalDateTime;
 import java.util.*;
 import java.util.concurrent.*;
 import java.util.concurrent.locks.ReentrantLock;
 
 import static eu.jonahbauer.chat.server.util.UrlTemplateProcessor.URL;
 
-@Log4j2
+@Slf4j
-public enum SocketSupervisor implements Chat {
+public final class SocketSupervisor implements Chat, AutoCloseable {
-    INSTANCE;
-
     private static final URI AUTH_SERVER = URI.create("https://chat.qed-verein.de/rubychat/account");
     private static final String ORIGIN = "https://chat.qed-verein.de";
     private static final String SERVER = "wss://chat.qed-verein.de/websocket?position=0&version=2&channel=";
     private static final int PING_INTERVAL = 30;
 
     private static final ScheduledExecutorService SCHEDULER = Executors.newScheduledThreadPool(1, Thread.ofVirtual().name("SocketSupervisor").factory());
-    private static final ObjectMapper MAPPER = new ObjectMapper().registerModule(new JavaTimeModule());
+    private static final Gson GSON = new GsonBuilder()
+            .registerTypeAdapterFactory(RuntimeTypeAdapterFactory.of(Message.class)
+                    .registerSubtype(Message.Ping.class, "ping")
+                    .registerSubtype(Message.Post.class, "post")
+                    .registerSubtype(Message.Ack.class, "ack")
+                    .registerSubtype(Message.Pong.class, "pong")
+            )
+            .registerTypeAdapter(boolean.class, new BooleanTypeAdapter())
+            .registerTypeAdapter(Boolean.class, new BooleanTypeAdapter())
+            .registerTypeAdapter(LocalDateTime.class, new LocalDateTimeTypeAdapter())
+            .create();
 
     private volatile @Nullable Config.Account account;
     private volatile @Nullable Credentials credentials;
@@ -49,6 +60,13 @@ public enum SocketSupervisor implements Chat {
     private final @NotNull CookieManager cookie = new CookieManager();
     private final @NotNull HttpClient client = HttpClient.newBuilder().cookieHandler(cookie).build();
     private final @NotNull ConcurrentMap<@NotNull String, @NotNull ChatClient> sockets = new ConcurrentHashMap<>();
+    private final @NotNull Lazy<ChatBotSupervisor> chatBotSupervisor;
+    private final @NotNull ReentrantLock lock = new ReentrantLock();
+
+    public SocketSupervisor(@NotNull Lazy<ChatBotSupervisor> chatBotSupervisor) throws JMException {
+        SocketManager.init(this);
+        this.chatBotSupervisor = chatBotSupervisor;
+    }
 
     public void setAccount(@NotNull Config.Account account) {
         this.account = Objects.requireNonNull(account, "account");
@@ -67,10 +85,10 @@ public enum SocketSupervisor implements Chat {
         } else {
             var out = new OutgoingMessage(name, message, channel, socket.delay, publicId, bottag);
             try {
-                socket.send(MAPPER.writeValueAsString(out));
+                socket.send(GSON.toJson(out, OutgoingMessage.class));
                 log.info("Sending message: {}", out);
                 return true;
-            } catch (JsonProcessingException e) {
+            } catch (Exception e) {
                 log.error("Could not serialize message: {}", out, e);
                 return false;
             }
@@ -82,11 +100,18 @@ public enum SocketSupervisor implements Chat {
      * @param config a configuration
      * @throws IllegalStateException if any sockets are already running
      */
-    public synchronized void start(@NotNull Config config) {
+    public void start(@NotNull Config config) {
-        if (!this.sockets.isEmpty()) throw new IllegalStateException("start(Config) may not be used when any sockets are running already");
+        lock.lock();
+        try {
+            if (!this.sockets.isEmpty()) {
+                throw new IllegalStateException("start(Config) may not be used when any sockets are running already");
+            }
 
-        setAccount(config.account());
+            setAccount(config.account());
-        config.channels().forEach(this::start);
+            config.channels().forEach(this::start);
+        } finally {
+            lock.unlock();
+        }
     }
 
     /**
@@ -94,11 +119,18 @@ public enum SocketSupervisor implements Chat {
      * @param channel the channel
      * @throws IllegalStateException if a socket is already connected to that channel
      */
-    public synchronized void start(@NotNull String channel) {
+    public void start(@NotNull String channel) {
-        if (sockets.containsKey(channel)) throw new SocketCreationException("Duplicate channel: " + channel);
+        lock.lock();
+        try {
+            if (sockets.containsKey(channel)) {
+                throw new SocketCreationException("Duplicate channel: " + channel);
+            }
 
-        var socket = new ChatClient(channel);
+            var socket = new ChatClient(channel);
-        this.sockets.put(channel, socket);
+            this.sockets.put(channel, socket);
+        } finally {
+            lock.unlock();
+        }
     }
 
     /**
@@ -151,6 +183,11 @@ public enum SocketSupervisor implements Chat {
         }
     }
 
+    @Override
+    public void close() throws InterruptedException {
+        stop();
+    }
+
     public @NotNull SortedSet<@NotNull String> getChannels() {
         return Collections.unmodifiableSortedSet(new TreeSet<>(sockets.keySet()));
     }
@@ -191,7 +228,7 @@ public enum SocketSupervisor implements Chat {
         return credentials;
     }
 
-    private record Credentials(String userid, String pwhash) {}
+    private record Credentials(@NotNull String userid, @NotNull String pwhash) {}
 
 
     private sealed interface ChatClientState {
@@ -218,7 +255,7 @@ public enum SocketSupervisor implements Chat {
     }
 
     private final class ChatClient implements WebSocket.Listener, ChatClientState {
-        private final String channel;
+        private final @NotNull String channel;
         private final @NotNull ReentrantLock lock = new ReentrantLock();
         private final @NotNull CountDownLatch stopped = new CountDownLatch(1);
 
@@ -227,7 +264,7 @@ public enum SocketSupervisor implements Chat {
 
         public ChatClient(@NotNull String channel) {
             this.channel = channel;
-            SocketSupport.register(channel);
+            SocketSupport.register(SocketSupervisor.this, channel);
             this.state.onEnter();
         }
 
@@ -419,18 +456,23 @@ public enum SocketSupervisor implements Chat {
 
             private void onMessage(@NotNull List<@NotNull CharSequence> parts) {
                 var text = String.join("", parts);
+                Message message;
                 try {
-                    var message = MAPPER.readValue(text, Message.class);
+                    message = GSON.fromJson(text, Message.class);
+                } catch (Exception e) {
+                    log.warn("Could not parse as message: {}", text, e);
+                    return;
+                }
 
-                    var level = message instanceof Message.Post || message instanceof Message.Ack ? Level.INFO : Level.DEBUG;
+                if (message instanceof Message.Post) {
-                    log.log(level, "Received message: {}", message);
+                    log.info("Received message: {}", message);
+                } else {
+                    log.debug("Received message: {}", message);
+                }
 
-                    if (message instanceof Message.Post post) {
+                if (message instanceof Message.Post post) {
-                        delay = post.id() + 1;
+                    delay = post.id() + 1;
-                        ChatBotSupervisor.INSTANCE.onMessage(post);
+                    SocketSupervisor.this.chatBotSupervisor.get().onMessage(post);
-                    }
-                } catch (JsonProcessingException e) {
-                    log.warn("Could not parse as message: {}", text, e);
                 }
             }
 
@@ -502,12 +544,8 @@ public enum SocketSupervisor implements Chat {
             }
 
             private void ping() {
-                try {
+                socket.sendText(GSON.toJson(Message.PING, Message.class), true);
-                    socket.sendText(MAPPER.writeValueAsString(Message.PING), true);
+                log.debug("Sending message: {}", Message.PING);
-                    log.debug("Sending message: {}", Message.PING);
-                } catch (IOException ex) {
-                    log.error("Failed to send ping", ex);
-                }
             }
 
             @Override

server/src/main/java/eu/jonahbauer/chat/server/util/Lazy.java

@@ -0,0 +1,26 @@
+package eu.jonahbauer.chat.server.util;
+
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Objects;
+
+public interface Lazy<T> {
+    @NotNull T get();
+
+    class MutableLazy<T> implements Lazy<T> {
+        private T value;
+
+        @Override
+        public @NotNull T get() {
+            var value = this.value;
+            if (value == null) throw new IllegalStateException();
+            return value;
+        }
+
+        public @NotNull T set(@NotNull T value) {
+            if (this.value != null) throw new IllegalStateException();
+            this.value = Objects.requireNonNull(value);
+            return value;
+        }
+    }
+}

server/src/main/java/module-info.java

@@ -1,17 +1,15 @@
 module eu.jonahbauer.chat.server {
     exports eu.jonahbauer.chat.server;
-    opens eu.jonahbauer.chat.server.bot to com.fasterxml.jackson.databind;
+    opens eu.jonahbauer.chat.server.bot to com.google.gson;
-    opens eu.jonahbauer.chat.server.socket to com.fasterxml.jackson.databind;
+    opens eu.jonahbauer.chat.server.socket to com.google.gson;
 
-    requires com.fasterxml.jackson.core;
+    requires com.google.gson;
-    requires com.fasterxml.jackson.databind;
-    requires com.fasterxml.jackson.datatype.jsr310;
     requires eu.jonahbauer.chat.bot.api;
     requires eu.jonahbauer.chat.server.management;
     requires java.management;
     requires java.net.http;
-    requires org.apache.logging.log4j;
+    requires org.slf4j;
-    requires org.jetbrains.annotations;
 
+    requires static transitive org.jetbrains.annotations;
     requires static lombok;
 }

server/src/main/resources/log4j2.xml

@@ -1,12 +0,0 @@
-<Configuration>
-    <Appenders>
-        <Console name="console" target="SYSTEM_OUT">
-            <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} %highlight{%-5level} [%15.15t] %style{%c{1}}{cyan} : %msg%n" />
-        </Console>
-    </Appenders>
-    <Loggers>
-        <Root level="info" additivity="false">
-            <AppenderRef ref="console" />
-        </Root>
-    </Loggers>
-</Configuration>

server/src/main/resources/logback.xml

@@ -0,0 +1,11 @@
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} %highlight(%-5level) [%15.15t] %cyan(%c{1}) : %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="info">
+        <appender-ref ref="STDOUT"/>
+    </root>
+</configuration>

settings.gradle.kts

@@ -4,6 +4,7 @@ rootProject.name = "ChatBot"
 
 include("server")
 include("bot-api")
+include("bot-database")
 include("bots")
 include("management")
 
@@ -11,6 +12,9 @@ include("management")
 include("bots:ping-bot")
 project(":bots:ping-bot").name = "ping-bot"
 
+include("bots:pizza-bot")
+project(":bots:pizza-bot").name = "pizza-bot"
+
 dependencyResolutionManagement {
     repositories {
         mavenCentral()