feat: messaging (#7)

* feat: messaging

* fix: some things

* feat: make it actually working

* feat: disable messaging by default

* fix: avoid infinity loop

* feat: multiple channels

* remove todo message

* fix: global channel should be lighteco:messages

* fix: check if CHANNELS not null

* refactor: set channels in constructor

* fix: push user updates on quit when user is dirty

api/src/main/java/dev/xhyrom/lighteco/api/LightEco.java

@@ -3,10 +3,13 @@ package dev.xhyrom.lighteco.api;
 import dev.xhyrom.lighteco.api.manager.CommandManager;
 import dev.xhyrom.lighteco.api.manager.CurrencyManager;
 import dev.xhyrom.lighteco.api.manager.UserManager;
+import dev.xhyrom.lighteco.api.messaging.MessagingService;
 import dev.xhyrom.lighteco.api.platform.Platform;
 import dev.xhyrom.lighteco.api.platform.PlayerAdapter;
 import org.checkerframework.checker.nullness.qual.NonNull;
 
+import java.util.Optional;
+
 public interface LightEco {
     /**
      * Gets the {@link Platform}, which represents the current platform the
@@ -37,6 +40,13 @@ public interface LightEco {
      */
     @NonNull CommandManager getCommandManager();
 
+    /**
+     * Gets the {@link MessagingService}, which manages the messaging.
+     *
+     * @return the messaging service
+     */
+    @NonNull Optional<MessagingService> getMessagingService();
+
     /**
      * Gets the {@link PlayerAdapter} for a player class.
      *

api/src/main/java/dev/xhyrom/lighteco/api/messaging/MessagingService.java

@@ -0,0 +1,8 @@
+package dev.xhyrom.lighteco.api.messaging;
+
+import dev.xhyrom.lighteco.api.model.currency.Currency;
+import dev.xhyrom.lighteco.api.model.user.User;
+
+public interface MessagingService {
+    void pushUserUpdate(User user, Currency currency);
+}

api/src/main/java/dev/xhyrom/lighteco/api/messenger/IncomingMessageConsumer.java

@@ -0,0 +1,10 @@
+package dev.xhyrom.lighteco.api.messenger;
+
+import dev.xhyrom.lighteco.api.messenger.message.Message;
+import org.checkerframework.checker.nullness.qual.NonNull;
+
+public interface IncomingMessageConsumer {
+    void consumeIncomingMessage(@NonNull Message message);
+
+    void consumeRawIncomingMessage(@NonNull String message);
+}

api/src/main/java/dev/xhyrom/lighteco/api/messenger/Messenger.java

@@ -0,0 +1,12 @@
+package dev.xhyrom.lighteco.api.messenger;
+
+import dev.xhyrom.lighteco.api.messenger.message.OutgoingMessage;
+import org.checkerframework.checker.nullness.qual.NonNull;
+
+public interface Messenger extends AutoCloseable {
+    void sendOutgoingMessage(@NonNull OutgoingMessage message, boolean global);
+
+    @Override
+    default void close() {
+    }
+}

api/src/main/java/dev/xhyrom/lighteco/api/messenger/MessengerProvider.java

@@ -0,0 +1,7 @@
+package dev.xhyrom.lighteco.api.messenger;
+
+import org.checkerframework.checker.nullness.qual.NonNull;
+
+public interface MessengerProvider {
+    @NonNull Messenger obtain(@NonNull IncomingMessageConsumer consumer);
+}

api/src/main/java/dev/xhyrom/lighteco/api/messenger/message/Message.java

@@ -0,0 +1,12 @@
+package dev.xhyrom.lighteco.api.messenger.message;
+
+import org.checkerframework.checker.nullness.qual.NonNull;
+
+import java.util.UUID;
+
+/**
+ * Represents a message that can be received by a {@link dev.xhyrom.lighteco.api.messenger.Messenger}.
+ */
+public interface Message {
+    @NonNull UUID getId();
+}

api/src/main/java/dev/xhyrom/lighteco/api/messenger/message/OutgoingMessage.java

@@ -0,0 +1,15 @@
+package dev.xhyrom.lighteco.api.messenger.message;
+
+import org.checkerframework.checker.nullness.qual.NonNull;
+
+/**
+ * Represents a message that can be sent via a {@link dev.xhyrom.lighteco.api.messenger.Messenger}.
+ */
+public interface OutgoingMessage extends Message {
+    /**
+     * Serializes message into a string.
+     *
+     * @return serialized message
+     */
+    @NonNull String serialize();
+}

api/src/main/java/dev/xhyrom/lighteco/api/messenger/message/type/UserUpdateMessage.java

@@ -0,0 +1,23 @@
+package dev.xhyrom.lighteco.api.messenger.message.type;
+
+import dev.xhyrom.lighteco.api.messenger.message.Message;
+import org.checkerframework.checker.nullness.qual.NonNull;
+
+import java.math.BigDecimal;
+import java.util.UUID;
+
+/**
+ * Represents a message that is sent when a user updates their profile.
+ */
+public interface UserUpdateMessage extends Message {
+    /**
+     * Gets the unique id of the user that updated their profile.
+     *
+     * @return the user's unique id
+     */
+    @NonNull UUID getUserUniqueId();
+
+    @NonNull String getCurrencyIdentifier();
+
+    @NonNull BigDecimal getNewBalance();
+}

bukkit/src/main/java/dev/xhyrom/lighteco/bukkit/BukkitLightEcoPlugin.java

@@ -8,6 +8,7 @@ import dev.xhyrom.lighteco.bukkit.listeners.BukkitConnectionListener;
 import dev.xhyrom.lighteco.bukkit.manager.BukkitCommandManager;
 import dev.xhyrom.lighteco.bukkit.manager.BukkitContextManager;
 import dev.xhyrom.lighteco.common.manager.currency.StandardCurrencyManager;
+import dev.xhyrom.lighteco.common.messaging.MessagingFactory;
 import dev.xhyrom.lighteco.common.plugin.AbstractLightEcoPlugin;
 import dev.xhyrom.lighteco.common.manager.user.StandardUserManager;
 import lombok.Getter;
@@ -45,6 +46,11 @@ public class BukkitLightEcoPlugin extends AbstractLightEcoPlugin {
         this.contextManager = new BukkitContextManager();
     }
 
+    @Override
+    protected MessagingFactory getMessagingFactory() {
+        return new MessagingFactory(this);
+    }
+
     @Override
     protected void registerApiOnPlatform(LightEco api) {
         this.getBootstrap().getLoader().getServer().getServicesManager().register(LightEco.class, api, this.getBootstrap().getLoader(), ServicePriority.Normal);

bukkit/src/main/java/dev/xhyrom/lighteco/bukkit/listeners/BukkitConnectionListener.java

@@ -1,11 +1,11 @@
 package dev.xhyrom.lighteco.bukkit.listeners;
 
 import dev.xhyrom.lighteco.bukkit.BukkitLightEcoPlugin;
+import dev.xhyrom.lighteco.common.model.currency.Currency;
 import dev.xhyrom.lighteco.common.model.user.User;
 import net.kyori.adventure.text.Component;
 import net.kyori.adventure.text.minimessage.MiniMessage;
 import net.kyori.adventure.text.serializer.legacy.LegacyComponentSerializer;
-import org.bukkit.Bukkit;
 import org.bukkit.event.EventHandler;
 import org.bukkit.event.EventPriority;
 import org.bukkit.event.Listener;
@@ -58,11 +58,10 @@ public class BukkitConnectionListener implements Listener {
         }
 
         this.plugin.getUserManager().saveUser(user)
-                .thenAccept(v -> {
+                .thenAccept(v -> this.plugin.getMessagingService().ifPresent(service -> {
-                    // make sure the player is offline before unloading
+                    for (Currency currency : this.plugin.getCurrencyManager().getRegisteredCurrencies()) {
-                    if (Bukkit.getPlayer(uniqueId) != null) return;
+                        service.pushUserUpdate(user, currency);
-
+                    }
-                    this.plugin.getUserManager().unload(uniqueId);
+                }));
-                });
     }
 }

common/build.gradle.kts

@@ -20,6 +20,7 @@ dependencies {
     implementation("eu.okaeri:okaeri-configs-validator-okaeri:5.0.0-beta.5")
 
     compileOnly("com.zaxxer:HikariCP:5.0.1")
+    compileOnly("redis.clients:jedis:5.1.0")
 
     compileOnly("org.projectlombok:lombok:1.18.28")
     annotationProcessor("org.projectlombok:lombok:1.18.28")

common/src/main/java/dev/xhyrom/lighteco/common/api/LightEcoApi.java

@@ -4,12 +4,15 @@ import dev.xhyrom.lighteco.api.LightEco;
 import dev.xhyrom.lighteco.api.manager.CommandManager;
 import dev.xhyrom.lighteco.api.manager.CurrencyManager;
 import dev.xhyrom.lighteco.api.manager.UserManager;
+import dev.xhyrom.lighteco.api.messaging.MessagingService;
 import dev.xhyrom.lighteco.api.platform.Platform;
 import dev.xhyrom.lighteco.api.platform.PlayerAdapter;
 import dev.xhyrom.lighteco.common.api.impl.*;
 import dev.xhyrom.lighteco.common.plugin.LightEcoPlugin;
 import org.checkerframework.checker.nullness.qual.NonNull;
 
+import java.util.Optional;
+
 public class LightEcoApi implements LightEco {
     private final LightEcoPlugin plugin;
 
@@ -49,6 +52,11 @@ public class LightEcoApi implements LightEco {
         return this.commandManager;
     }
 
+    @Override
+    public @NonNull Optional<MessagingService> getMessagingService() {
+        return this.plugin.getMessagingService().map(ApiMessagingService::new);
+    }
+
     @Override
     public @NonNull <T> PlayerAdapter<T> getPlayerAdapter(@NonNull Class<T> playerClass) {
         Class<?> expected = this.plugin.getContextManager().getPlayerClass();

common/src/main/java/dev/xhyrom/lighteco/common/api/impl/ApiAbstractManager.java

@@ -4,10 +4,10 @@ import dev.xhyrom.lighteco.common.plugin.LightEcoPlugin;
 
 public abstract class ApiAbstractManager<H> {
     protected final LightEcoPlugin plugin;
-    protected final H handler;
+    protected final H handle;
 
-    protected ApiAbstractManager(LightEcoPlugin plugin, H handler) {
+    protected ApiAbstractManager(LightEcoPlugin plugin, H handle) {
         this.plugin = plugin;
-        this.handler = handler;
+        this.handle = handle;
     }
 }

common/src/main/java/dev/xhyrom/lighteco/common/api/impl/ApiCommandManager.java

@@ -6,8 +6,8 @@ import dev.xhyrom.lighteco.common.plugin.LightEcoPlugin;
 import org.checkerframework.checker.nullness.qual.NonNull;
 
 public class ApiCommandManager extends ApiAbstractManager<dev.xhyrom.lighteco.common.manager.command.CommandManager> implements CommandManager {
-    public ApiCommandManager(LightEcoPlugin plugin, dev.xhyrom.lighteco.common.manager.command.CommandManager handler) {
+    public ApiCommandManager(LightEcoPlugin plugin, dev.xhyrom.lighteco.common.manager.command.CommandManager handle) {
-        super(plugin, handler);
+        super(plugin, handle);
     }
 
     @Override
@@ -15,7 +15,7 @@ public class ApiCommandManager extends ApiAbstractManager<dev.xhyrom.lighteco.co
         dev.xhyrom.lighteco.common.model.currency.Currency internal = this.plugin.getCurrencyManager()
                 .getIfLoaded(currency.getIdentifier());
 
-        this.handler.registerCurrencyCommand(internal);
+        this.handle.registerCurrencyCommand(internal);
     }
 
     @Override
@@ -23,6 +23,6 @@ public class ApiCommandManager extends ApiAbstractManager<dev.xhyrom.lighteco.co
         dev.xhyrom.lighteco.common.model.currency.Currency internal = this.plugin.getCurrencyManager()
                 .getIfLoaded(currency.getIdentifier());
 
-        this.handler.registerCurrencyCommand(internal, main);
+        this.handle.registerCurrencyCommand(internal, main);
     }
 }

common/src/main/java/dev/xhyrom/lighteco/common/api/impl/ApiCurrencyManager.java

@@ -8,29 +8,29 @@ import org.checkerframework.checker.nullness.qual.NonNull;
 import java.util.Collection;
 
 public class ApiCurrencyManager extends ApiAbstractManager<dev.xhyrom.lighteco.common.manager.currency.CurrencyManager> implements CurrencyManager {
-    public ApiCurrencyManager(LightEcoPlugin plugin, dev.xhyrom.lighteco.common.manager.currency.CurrencyManager handler) {
+    public ApiCurrencyManager(LightEcoPlugin plugin, dev.xhyrom.lighteco.common.manager.currency.CurrencyManager handle) {
-        super(plugin, handler);
+        super(plugin, handle);
     }
 
-    private Currency wrap(dev.xhyrom.lighteco.common.model.currency.Currency handler) {
+    private Currency wrap(dev.xhyrom.lighteco.common.model.currency.Currency handle) {
-        return handler.getProxy();
+        return handle.getProxy();
     }
 
     @Override
     public @NonNull Collection<Currency> getRegisteredCurrencies() {
-        return this.handler.values()
+        return this.handle.values()
                 .stream().map(this::wrap)
                 .toList();
     }
 
     @Override
     public Currency getCurrency(@NonNull String identifier) {
-        return wrap(this.handler.getIfLoaded(identifier));
+        return wrap(this.handle.getIfLoaded(identifier));
     }
 
     @Override
     public void registerCurrency(@NonNull Currency currency) {
         dev.xhyrom.lighteco.common.model.currency.Currency internal = new dev.xhyrom.lighteco.common.model.currency.Currency(currency);
-        this.handler.registerCurrency(internal);
+        this.handle.registerCurrency(internal);
     }
 }

common/src/main/java/dev/xhyrom/lighteco/common/api/impl/ApiMessagingService.java

@@ -0,0 +1,23 @@
+package dev.xhyrom.lighteco.common.api.impl;
+
+import dev.xhyrom.lighteco.api.messaging.MessagingService;
+import dev.xhyrom.lighteco.api.model.currency.Currency;
+import dev.xhyrom.lighteco.api.model.user.User;
+import dev.xhyrom.lighteco.common.messaging.InternalMessagingService;
+
+public class ApiMessagingService implements MessagingService {
+    private final InternalMessagingService handle;
+
+    public ApiMessagingService(InternalMessagingService handle) {
+        this.handle = handle;
+    }
+
+    @Override
+    public void pushUserUpdate(User user, Currency currency) {
+        dev.xhyrom.lighteco.common.model.currency.Currency internalCurrency = this.handle.getPlugin()
+                .getCurrencyManager()
+                .getIfLoaded(currency.getIdentifier());
+
+        this.handle.pushUserUpdate(ApiUser.cast(user), internalCurrency);
+    }
+}

common/src/main/java/dev/xhyrom/lighteco/common/api/impl/ApiUser.java

@@ -10,60 +10,68 @@ import java.math.BigDecimal;
 import java.util.UUID;
 
 public class ApiUser implements User {
-    private final dev.xhyrom.lighteco.common.model.user.User handler;
+    public static dev.xhyrom.lighteco.common.model.user.User cast(User u) {
+        if (u instanceof ApiUser) {
+            return ((ApiUser) u).handle;
+        }
 
-    public ApiUser(dev.xhyrom.lighteco.common.model.user.User handler) {
+        throw new IllegalArgumentException("Cannot cast " + u.getClass().getName() + " to " + ApiUser.class.getName());
-        this.handler = handler;
+    }
+
+    private final dev.xhyrom.lighteco.common.model.user.User handle;
+
+    public ApiUser(dev.xhyrom.lighteco.common.model.user.User handle) {
+        this.handle = handle;
     }
 
     @Override
     public @NonNull UUID getUniqueId() {
-        return this.handler.getUniqueId();
+        return this.handle.getUniqueId();
     }
 
     @Override
     public @Nullable String getUsername() {
-        return this.handler.getUsername();
+        return this.handle.getUsername();
     }
 
     @Override
     public @NonNull BigDecimal getBalance(@NonNull Currency currency) {
-        dev.xhyrom.lighteco.common.model.currency.Currency internal = this.handler.getPlugin()
+        dev.xhyrom.lighteco.common.model.currency.Currency internal = this.handle.getPlugin()
                 .getCurrencyManager()
                 .getIfLoaded(currency.getIdentifier());
 
-        return this.handler.getBalance(internal);
+        return this.handle.getBalance(internal);
     }
 
     @Override
     public void setBalance(@NonNull Currency currency, @NonNull BigDecimal balance) {
-        dev.xhyrom.lighteco.common.model.currency.Currency internal = this.handler.getPlugin()
+        dev.xhyrom.lighteco.common.model.currency.Currency internal = this.handle.getPlugin()
                 .getCurrencyManager()
                 .getIfLoaded(currency.getIdentifier());
 
-        this.handler.setBalance(internal, balance);
+        this.handle.setBalance(internal, balance);
     }
 
     @Override
     public void deposit(@NonNull Currency currency, @NonNull BigDecimal amount) {
-        dev.xhyrom.lighteco.common.model.currency.Currency internal = this.handler.getPlugin()
+        dev.xhyrom.lighteco.common.model.currency.Currency internal = this.handle.getPlugin()
                 .getCurrencyManager()
                 .getIfLoaded(currency.getIdentifier());
 
-        this.handler.deposit(internal, amount);
+        this.handle.deposit(internal, amount);
     }
 
     @Override
     public void withdraw(@NonNull Currency currency, @NonNull BigDecimal amount) {
-        dev.xhyrom.lighteco.common.model.currency.Currency internal = this.handler.getPlugin()
+        dev.xhyrom.lighteco.common.model.currency.Currency internal = this.handle.getPlugin()
                 .getCurrencyManager()
                 .getIfLoaded(currency.getIdentifier());
 
-        this.handler.withdraw(internal, amount);
+        this.handle.withdraw(internal, amount);
     }
 
     @Override
     public void sendMessage(Component message) {
-        this.handler.sendMessage(message);
+        this.handle.sendMessage(message);
     }
 }

common/src/main/java/dev/xhyrom/lighteco/common/api/impl/ApiUserManager.java

@@ -10,13 +10,13 @@ import java.util.UUID;
 import java.util.concurrent.CompletableFuture;
 
 public class ApiUserManager extends ApiAbstractManager<dev.xhyrom.lighteco.common.manager.user.UserManager> implements UserManager {
-    public ApiUserManager(LightEcoPlugin plugin, dev.xhyrom.lighteco.common.manager.user.UserManager handler) {
+    public ApiUserManager(LightEcoPlugin plugin, dev.xhyrom.lighteco.common.manager.user.UserManager handle) {
-        super(plugin, handler);
+        super(plugin, handle);
     }
 
-    private User wrap(dev.xhyrom.lighteco.common.model.user.User handler) {
+    private User wrap(dev.xhyrom.lighteco.common.model.user.User handle) {
-        this.plugin.getUserManager().getHousekeeper().registerUsage(handler.getUniqueId());
+        this.plugin.getUserManager().getHousekeeper().registerUsage(handle.getUniqueId());
-        return handler.getProxy();
+        return handle.getProxy();
     }
 
     @Override
@@ -42,11 +42,11 @@ public class ApiUserManager extends ApiAbstractManager<dev.xhyrom.lighteco.commo
 
     @Override
     public @Nullable User getUser(@NonNull UUID uniqueId) {
-        return wrap(this.handler.getIfLoaded(uniqueId));
+        return wrap(this.handle.getIfLoaded(uniqueId));
     }
 
     @Override
     public boolean isLoaded(@NonNull UUID uniqueId) {
-        return this.handler.isLoaded(uniqueId);
+        return this.handle.isLoaded(uniqueId);
     }
 }

common/src/main/java/dev/xhyrom/lighteco/common/config/Config.java

@@ -2,6 +2,7 @@ package dev.xhyrom.lighteco.common.config;
 
 import dev.xhyrom.lighteco.common.config.housekeeper.HousekeeperConfig;
 import dev.xhyrom.lighteco.common.config.message.MessageConfig;
+import dev.xhyrom.lighteco.common.config.messaging.MessagingConfig;
 import dev.xhyrom.lighteco.common.config.storage.StorageConfig;
 import eu.okaeri.configs.OkaeriConfig;
 import eu.okaeri.configs.annotation.Comment;
@@ -20,6 +21,9 @@ public class Config extends OkaeriConfig {
     @Comment("Storage settings.")
     public StorageConfig storage = new StorageConfig();
 
+    @Comment("Messaging settings.")
+    public MessagingConfig messaging = new MessagingConfig();
+
     @Comment("Save interval to storage in seconds.")
     public long saveInterval = 5L;
 

common/src/main/java/dev/xhyrom/lighteco/common/config/messaging/MessagingConfig.java

@@ -0,0 +1,15 @@
+package dev.xhyrom.lighteco.common.config.messaging;
+
+import dev.xhyrom.lighteco.common.messaging.MessagingType;
+import eu.okaeri.configs.OkaeriConfig;
+import eu.okaeri.configs.annotation.Comment;
+
+public class MessagingConfig extends OkaeriConfig {
+    @Comment("Messaging provider.")
+    @Comment("Available providers: redis")
+    public MessagingType provider = MessagingType.NONE;
+
+    @Comment("Data storage settings.")
+    @Comment("You don't need to worry about this if you're using plugin message.")
+    public MessagingDataConfig data = new MessagingDataConfig();
+}

common/src/main/java/dev/xhyrom/lighteco/common/config/messaging/MessagingDataConfig.java

@@ -0,0 +1,16 @@
+package dev.xhyrom.lighteco.common.config.messaging;
+
+import eu.okaeri.configs.OkaeriConfig;
+import eu.okaeri.configs.annotation.Comment;
+
+public class MessagingDataConfig extends OkaeriConfig {
+    @Comment("Define the address and port of the messaging service.")
+    public String address = "localhost";
+
+    @Comment("Credentials for connecting to the messaging service.")
+    public String username = "root";
+    public String password = "password";
+
+    @Comment("Whether to use SSL to connect to the messaging service.")
+    public boolean ssl = false;
+}

common/src/main/java/dev/xhyrom/lighteco/common/dependencies/Dependency.java

@@ -61,6 +61,29 @@ public enum Dependency {
             "postgresql",
             "42.6.0",
             Relocation.of("postgresql", "org{}postgresql")
+    ),
+    JEDIS(
+            "redis.clients",
+            "jedis",
+            "5.1.0",
+            Relocation.of("jedis", "redis{}clients{}jedis"),
+            Relocation.of("commonspool2", "org{}apache{}commons{}pool2")
+    ),
+    SLF4J_SIMPLE(
+            "org.slf4j",
+            "slf4j-simple",
+            "1.7.30"
+    ),
+    SLF4J_API(
+            "org.slf4j",
+            "slf4j-api",
+            "1.7.30"
+    ),
+    COMMONS_POOL_2(
+            "org.apache.commons",
+            "commons-pool2",
+            "2.9.0",
+            Relocation.of("commonspool2", "org{}apache{}commons{}pool2")
     );
 
     private final String fullPath;

common/src/main/java/dev/xhyrom/lighteco/common/dependencies/DependencyManager.java

@@ -1,5 +1,6 @@
 package dev.xhyrom.lighteco.common.dependencies;
 
+import dev.xhyrom.lighteco.common.messaging.MessagingType;
 import dev.xhyrom.lighteco.common.storage.StorageType;
 
 import java.util.Set;
@@ -8,6 +9,7 @@ public interface DependencyManager extends AutoCloseable {
     void loadDependencies(Set<Dependency> dependencies);
 
     void loadStorageDependencies(Set<StorageType> types);
+    void loadMessagingDependencies(Set<MessagingType> types);
 
     ClassLoader obtainClassLoaderWith(Set<Dependency> dependencies);
 

common/src/main/java/dev/xhyrom/lighteco/common/dependencies/DependencyManagerImpl.java

@@ -5,10 +5,11 @@ import com.google.common.io.MoreFiles;
 import dev.xhyrom.lighteco.common.config.Config;
 import dev.xhyrom.lighteco.common.dependencies.relocation.Relocation;
 import dev.xhyrom.lighteco.common.dependencies.relocation.RelocationHandler;
+import dev.xhyrom.lighteco.common.messaging.MessagingType;
 import dev.xhyrom.lighteco.common.plugin.LightEcoPlugin;
 import dev.xhyrom.lighteco.common.plugin.logger.PluginLogger;
-import dev.xhyrom.lighteco.common.util.URLClassLoaderAccess;
 import dev.xhyrom.lighteco.common.storage.StorageType;
+import dev.xhyrom.lighteco.common.util.URLClassLoaderAccess;
 import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
 
 import java.io.IOException;
@@ -17,8 +18,6 @@ import java.net.URLClassLoader;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.*;
-import java.util.concurrent.CompletableFuture;
-import java.util.concurrent.CountDownLatch;
 
 public class DependencyManagerImpl implements DependencyManager {
     private final EnumMap<Dependency, Path> loaded = new EnumMap<>(Dependency.class);
@@ -49,42 +48,29 @@ public class DependencyManagerImpl implements DependencyManager {
 
     @Override
     public void loadDependencies(Set<Dependency> dependencies) {
-        CountDownLatch latch = new CountDownLatch(dependencies.size());
-
         if (this.config.debug)
             this.logger.info("Loading dependencies: " + dependencies);
 
         for (Dependency dependency : dependencies) {
             if (this.loaded.containsKey(dependency)) {
-                latch.countDown();
                 continue;
             }
 
-            CompletableFuture.runAsync(() -> {
-                if (this.config.debug)
-                    this.logger.info("Loading dependency " + dependency);
-
-                try {
-                    loadDependency(dependency);
-                } catch (Exception e) {
-                    throw new RuntimeException("Failed to load dependency " + dependency, e);
-                } finally {
-                    latch.countDown();
-
-                    if (this.config.debug)
-                        this.logger.info("Loaded dependency " + dependency);
-                }
-            });
-        }
-
-        try {
-            latch.await();
-
             if (this.config.debug)
-                this.logger.info("Loaded dependencies: " + dependencies);
+                this.logger.info("Loading dependency " + dependency);
-        } catch (InterruptedException e) {
+
-            throw new RuntimeException(e);
+            try {
+                loadDependency(dependency);
+            } catch (Exception e) {
+                throw new RuntimeException("Failed to load dependency " + dependency, e);
+            } finally {
+                if (this.config.debug)
+                    this.logger.info("Loaded dependency " + dependency);
+            }
         }
+
+        if (this.config.debug)
+            this.logger.info("Loaded dependencies: " + dependencies);
     }
 
     private void loadDependency(Dependency dependency) throws Exception {
@@ -142,6 +128,11 @@ public class DependencyManagerImpl implements DependencyManager {
         loadDependencies(this.registry.resolveStorageDependencies(types));
     }
 
+    @Override
+    public void loadMessagingDependencies(Set<MessagingType> types) {
+        loadDependencies(this.registry.resolveMessagingDependencies(types));
+    }
+
     @Override
     public ClassLoader obtainClassLoaderWith(Set<Dependency> dependencies) {
         ImmutableSet<Dependency> set = ImmutableSet.copyOf(dependencies);

common/src/main/java/dev/xhyrom/lighteco/common/dependencies/DependencyRegistry.java

@@ -2,6 +2,7 @@ package dev.xhyrom.lighteco.common.dependencies;
 
 import com.google.common.collect.ImmutableSetMultimap;
 import com.google.common.collect.SetMultimap;
+import dev.xhyrom.lighteco.common.messaging.MessagingType;
 import dev.xhyrom.lighteco.common.storage.StorageType;
 
 import java.util.LinkedHashSet;
@@ -16,6 +17,10 @@ public class DependencyRegistry {
             .putAll(StorageType.POSTGRESQL, Dependency.POSTGRESQL_DRIVER,   Dependency.HIKARI)
             .build();
 
+    private static final SetMultimap<MessagingType, Dependency> MESSAGING_DEPENDENCIES = ImmutableSetMultimap.<MessagingType, Dependency>builder()
+            .putAll(MessagingType.REDIS, Dependency.COMMONS_POOL_2, Dependency.JEDIS, Dependency.SLF4J_API, Dependency.SLF4J_SIMPLE)
+            .build();
+
     public Set<Dependency> resolveStorageDependencies(Set<StorageType> types) {
         Set<Dependency> dependencies = new LinkedHashSet<>();
 
@@ -26,6 +31,16 @@ public class DependencyRegistry {
         return dependencies;
     }
 
+    public Set<Dependency> resolveMessagingDependencies(Set<MessagingType> types) {
+        Set<Dependency> dependencies = new LinkedHashSet<>();
+
+        for (MessagingType type : types) {
+            dependencies.addAll(MESSAGING_DEPENDENCIES.get(type));
+        }
+
+        return dependencies;
+    }
+
     public boolean shouldAutoLoad(Dependency dependency) {
         return switch (dependency) {
             case H2_DRIVER, SQLITE_DRIVER -> false;

common/src/main/java/dev/xhyrom/lighteco/common/messaging/InternalMessagingService.java

@@ -0,0 +1,13 @@
+package dev.xhyrom.lighteco.common.messaging;
+
+import dev.xhyrom.lighteco.common.model.currency.Currency;
+import dev.xhyrom.lighteco.common.model.user.User;
+import dev.xhyrom.lighteco.common.plugin.LightEcoPlugin;
+
+public interface InternalMessagingService {
+    LightEcoPlugin getPlugin();
+
+    void pushUserUpdate(User user, Currency currency);
+
+    void shutdown();
+}

common/src/main/java/dev/xhyrom/lighteco/common/messaging/LightEcoMessagingService.java

@@ -0,0 +1,145 @@
+package dev.xhyrom.lighteco.common.messaging;
+
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonPrimitive;
+import dev.xhyrom.lighteco.api.messenger.IncomingMessageConsumer;
+import dev.xhyrom.lighteco.api.messenger.Messenger;
+import dev.xhyrom.lighteco.api.messenger.MessengerProvider;
+import dev.xhyrom.lighteco.api.messenger.message.Message;
+import dev.xhyrom.lighteco.api.messenger.message.type.UserUpdateMessage;
+import dev.xhyrom.lighteco.common.cache.ExpiringSet;
+import dev.xhyrom.lighteco.common.messaging.message.MessageType;
+import dev.xhyrom.lighteco.common.messaging.message.UserUpdateMessageImpl;
+import dev.xhyrom.lighteco.common.model.currency.Currency;
+import dev.xhyrom.lighteco.common.model.user.User;
+import dev.xhyrom.lighteco.common.plugin.LightEcoPlugin;
+import dev.xhyrom.lighteco.common.util.gson.GsonProvider;
+import lombok.Getter;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+import java.util.UUID;
+import java.util.concurrent.TimeUnit;
+
+public class LightEcoMessagingService implements InternalMessagingService, IncomingMessageConsumer {
+    @Getter
+    private final LightEcoPlugin plugin;
+    private final ExpiringSet<UUID> receivedMessages;
+
+    private final Messenger messenger;
+    private final MessengerProvider provider;
+
+    public LightEcoMessagingService(LightEcoPlugin plugin, MessengerProvider provider) {
+        this.plugin = plugin;
+
+        this.provider = provider;
+        this.messenger = provider.obtain(this);
+        this.receivedMessages = new ExpiringSet<>(30, TimeUnit.MINUTES);
+    }
+
+    private UUID generateMessageId() {
+        UUID id = UUID.randomUUID();
+
+        this.receivedMessages.add(id);
+        return id;
+    }
+
+    @Override
+    public void pushUserUpdate(User user, Currency currency) {
+        this.plugin.getBootstrap().getScheduler().async().execute(() ->
+                this.messenger.sendOutgoingMessage(
+                        new UserUpdateMessageImpl(generateMessageId(), user.getUniqueId(), currency.getIdentifier(), user.getBalance(currency)),
+                        currency.getType() == dev.xhyrom.lighteco.api.model.currency.Currency.Type.GLOBAL
+                )
+        );
+    }
+
+    public static @NonNull String serialize(MessageType type, UUID id, JsonElement content) {
+        JsonObject data = new JsonObject();
+
+        data.add("i", new JsonPrimitive(id.toString()));
+        data.add("t", new JsonPrimitive(type.name()));
+        data.add("c", content);
+
+        return GsonProvider.get().toJson(data);
+    }
+
+    @Override
+    public void consumeIncomingMessage(@NonNull Message message) {
+        if (!this.receivedMessages.add(message.getId())) {
+            return;
+        }
+
+        this.processIncomingMessage(message);
+    }
+
+    @Override
+    public void consumeRawIncomingMessage(@NonNull String message) {
+        try {
+            deserializeAndConsumeRawIncomingMessage(message);
+        } catch (Exception e) {
+            this.plugin.getBootstrap().getLogger().warn("Failed to deserialize incoming message: " + message, e);
+        }
+    }
+
+    private void deserializeAndConsumeRawIncomingMessage(@NonNull String message) {
+        JsonObject parsed = GsonProvider.get().fromJson(message, JsonObject.class);
+
+        JsonElement idElement = parsed.get("i");
+        if (idElement == null) {
+            throw new IllegalStateException("Missing message id: " + message);
+        }
+
+        UUID id = UUID.fromString(idElement.getAsString());
+
+        if (!this.receivedMessages.add(id)) {
+            return;
+        }
+
+        JsonElement typeElement = parsed.get("t");
+        if (typeElement == null) {
+            throw new IllegalStateException("Missing message type: " + message);
+        }
+
+        MessageType type = MessageType.valueOf(typeElement.getAsString());
+
+        @Nullable JsonElement contentElement = parsed.get("c");
+
+        Message deserialized;
+        switch (type) {
+            case USER_UPDATE:
+                deserialized = UserUpdateMessageImpl.deserialize(id, contentElement);
+                break;
+            default:
+                return;
+        }
+
+        this.processIncomingMessage(deserialized);
+    }
+
+    private void processIncomingMessage(Message message) {
+        if (message instanceof UserUpdateMessage userUpdateMessage) {
+            this.plugin.getBootstrap().getScheduler().async().execute(() -> {
+                User user = this.plugin.getUserManager().getIfLoaded(userUpdateMessage.getUserUniqueId());
+                if (user == null) {
+                    return;
+                }
+
+                Currency currency = this.plugin.getCurrencyManager().getIfLoaded(userUpdateMessage.getCurrencyIdentifier());
+                if (currency == null) {
+                    return;
+                }
+
+                user.setBalance(currency, userUpdateMessage.getNewBalance(), false, false);
+            });
+        } else {
+            throw new IllegalStateException("Unknown message type: " + message.getClass().getName());
+        }
+    }
+
+    @Override
+    public void shutdown() {
+        this.messenger.close();
+    }
+}

common/src/main/java/dev/xhyrom/lighteco/common/messaging/MessagingFactory.java

@@ -0,0 +1,38 @@
+package dev.xhyrom.lighteco.common.messaging;
+
+import dev.xhyrom.lighteco.api.messenger.MessengerProvider;
+import dev.xhyrom.lighteco.common.messaging.type.redis.RedisMessengerProvider;
+import dev.xhyrom.lighteco.common.plugin.LightEcoPlugin;
+
+import java.util.Set;
+
+public class MessagingFactory {
+    private final LightEcoPlugin plugin;
+
+    public MessagingFactory(LightEcoPlugin plugin) {
+        this.plugin = plugin;
+    }
+
+    protected LightEcoPlugin getPlugin() {
+        return this.plugin;
+    }
+
+    public Set<MessagingType> getRequiredTypes() {
+        return Set.of(this.plugin.getConfig().messaging.provider);
+    }
+
+    public InternalMessagingService get() {
+        MessagingType type = this.plugin.getConfig().messaging.provider;
+        MessengerProvider provider = this.createProvider(type);
+        if (provider == null) return null;
+
+        return new LightEcoMessagingService(this.plugin, provider);
+    }
+
+    private MessengerProvider createProvider(MessagingType type) {
+        return switch (type) {
+            case REDIS -> new RedisMessengerProvider(this.plugin);
+            default -> null;
+        };
+    }
+}

common/src/main/java/dev/xhyrom/lighteco/common/messaging/MessagingType.java

@@ -0,0 +1,6 @@
+package dev.xhyrom.lighteco.common.messaging;
+
+public enum MessagingType {
+    NONE,
+    REDIS
+}

common/src/main/java/dev/xhyrom/lighteco/common/messaging/message/AbstractMessage.java

@@ -0,0 +1,20 @@
+package dev.xhyrom.lighteco.common.messaging.message;
+
+import dev.xhyrom.lighteco.api.messenger.message.Message;
+import dev.xhyrom.lighteco.api.messenger.message.OutgoingMessage;
+import org.checkerframework.checker.nullness.qual.NonNull;
+
+import java.util.UUID;
+
+public abstract class AbstractMessage implements Message, OutgoingMessage {
+    private final UUID id;
+
+    protected AbstractMessage(UUID id) {
+        this.id = id;
+    }
+
+    @Override
+    public @NonNull UUID getId() {
+        return this.id;
+    }
+}

common/src/main/java/dev/xhyrom/lighteco/common/messaging/message/MessageType.java

@@ -0,0 +1,5 @@
+package dev.xhyrom.lighteco.common.messaging.message;
+
+public enum MessageType {
+    USER_UPDATE;
+}

common/src/main/java/dev/xhyrom/lighteco/common/messaging/message/UserUpdateMessageImpl.java

@@ -0,0 +1,49 @@
+package dev.xhyrom.lighteco.common.messaging.message;
+
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonPrimitive;
+import dev.xhyrom.lighteco.api.messenger.message.type.UserUpdateMessage;
+import dev.xhyrom.lighteco.common.messaging.LightEcoMessagingService;
+import lombok.Getter;
+import org.checkerframework.checker.nullness.qual.NonNull;
+
+import java.math.BigDecimal;
+import java.util.UUID;
+
+public class UserUpdateMessageImpl extends AbstractMessage implements UserUpdateMessage {
+    private static final MessageType TYPE = MessageType.USER_UPDATE;
+
+    @Getter
+    private final UUID userUniqueId;
+    @Getter
+    private final String currencyIdentifier;
+    @Getter
+    private final BigDecimal newBalance;
+
+    public static UserUpdateMessage deserialize(UUID id, @NonNull JsonElement data) {
+        JsonObject obj = data.getAsJsonObject();
+        UUID userUniqueId = UUID.fromString(obj.get("u").getAsString());
+        String currencyIdentifier = obj.get("c").getAsString();
+        BigDecimal newBalance = obj.get("b").getAsBigDecimal();
+
+        return new UserUpdateMessageImpl(id, userUniqueId, currencyIdentifier, newBalance);
+    }
+
+    public UserUpdateMessageImpl(UUID id, UUID userUniqueId, String currencyIdentifier, BigDecimal newBalance) {
+        super(id);
+        this.userUniqueId = userUniqueId;
+        this.currencyIdentifier = currencyIdentifier;
+        this.newBalance = newBalance;
+    }
+
+    @Override
+    public @NonNull String serialize() {
+        JsonObject data = new JsonObject();
+        data.add("u", new JsonPrimitive(this.userUniqueId.toString()));
+        data.add("c", new JsonPrimitive(this.currencyIdentifier));
+        data.add("b", new JsonPrimitive(this.newBalance));
+
+        return LightEcoMessagingService.serialize(TYPE, getId(), data);
+    }
+}

common/src/main/java/dev/xhyrom/lighteco/common/messaging/type/redis/RedisMessenger.java

@@ -0,0 +1,94 @@
+package dev.xhyrom.lighteco.common.messaging.type.redis;
+
+import dev.xhyrom.lighteco.api.messenger.IncomingMessageConsumer;
+import dev.xhyrom.lighteco.api.messenger.Messenger;
+import dev.xhyrom.lighteco.api.messenger.message.OutgoingMessage;
+import dev.xhyrom.lighteco.common.plugin.LightEcoPlugin;
+import lombok.Getter;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.checker.nullness.qual.Nullable;
+import redis.clients.jedis.*;
+
+public class RedisMessenger implements Messenger {
+    private static final String CHANNEL = "lighteco:{}:messages";
+    @Getter
+    private final String[] channels;
+
+    private final LightEcoPlugin plugin;
+    private final IncomingMessageConsumer consumer;
+
+    private UnifiedJedis jedis;
+    private Subscription sub;
+
+    public RedisMessenger(LightEcoPlugin plugin, IncomingMessageConsumer consumer) {
+        this.plugin = plugin;
+        this.consumer = consumer;
+
+        this.channels = new String[] {
+                CHANNEL.replace("{}:", ""),
+                CHANNEL.replace("{}", this.plugin.getConfig().server)
+        };
+    }
+
+    public void init(@Nullable String address, @Nullable String username, String password, boolean ssl) {
+        this.init(new JedisPooled(
+                parseAddress(address),
+                jedisConfig(username, password, ssl)
+        ));
+    }
+
+    private void init(UnifiedJedis jedis) {
+        this.jedis = jedis;
+        this.sub = new Subscription(this);
+
+        this.plugin.getBootstrap().getScheduler().async().execute(() -> {
+            this.jedis.subscribe(this.sub, this.getChannels());
+        });
+    }
+
+    private static JedisClientConfig jedisConfig(@Nullable String username, @Nullable String password, boolean ssl) {
+        return DefaultJedisClientConfig.builder()
+                .user(username)
+                .password(password)
+                .ssl(ssl)
+                .timeoutMillis(Protocol.DEFAULT_TIMEOUT)
+                .build();
+    }
+
+    private static HostAndPort parseAddress(String address) {
+        String[] addressSplit = address.split(":");
+        String host = addressSplit[0];
+        int port = addressSplit.length > 1 ? Integer.parseInt(addressSplit[1]) : Protocol.DEFAULT_PORT;
+
+        return new HostAndPort(host, port);
+    }
+
+    @Override
+    public void sendOutgoingMessage(@NonNull OutgoingMessage message, boolean global) {
+        this.jedis.publish(global ? getChannels()[0] : getChannels()[1], message.serialize());
+    }
+
+    @Override
+    public void close() {
+        this.sub.unsubscribe();
+        this.jedis.close();
+    }
+
+    private static class Subscription extends JedisPubSub {
+        private final RedisMessenger messenger;
+
+        public Subscription(RedisMessenger messenger) {
+            this.messenger = messenger;
+        }
+
+        @Override
+        public void onMessage(String channel, String message) {
+            String[] channels = this.messenger.getChannels();
+            if (!channel.equals(channels[0]) && !channel.equals(channels[1])) {
+                return;
+            }
+
+            this.messenger.consumer.consumeRawIncomingMessage(message);
+        }
+    }
+}

common/src/main/java/dev/xhyrom/lighteco/common/messaging/type/redis/RedisMessengerProvider.java

@@ -0,0 +1,33 @@
+package dev.xhyrom.lighteco.common.messaging.type.redis;
+
+import dev.xhyrom.lighteco.api.messenger.IncomingMessageConsumer;
+import dev.xhyrom.lighteco.api.messenger.Messenger;
+import dev.xhyrom.lighteco.api.messenger.MessengerProvider;
+import dev.xhyrom.lighteco.common.plugin.LightEcoPlugin;
+import org.checkerframework.checker.nullness.qual.NonNull;
+
+public class RedisMessengerProvider implements MessengerProvider {
+    private final LightEcoPlugin plugin;
+
+    public RedisMessengerProvider(LightEcoPlugin plugin) {
+        this.plugin = plugin;
+    }
+
+    @Override
+    public @NonNull Messenger obtain(@NonNull IncomingMessageConsumer consumer) {
+        RedisMessenger messenger = new RedisMessenger(this.plugin, consumer);
+
+        String address = this.plugin.getConfig().messaging.data.address;
+        String username = this.plugin.getConfig().messaging.data.username;
+        String password = this.plugin.getConfig().messaging.data.password;
+
+        if (password.isEmpty()) password = null;
+        if (username.isEmpty()) username = null;
+
+        boolean ssl = this.plugin.getConfig().messaging.data.ssl;
+
+        messenger.init(address, username, password, ssl);
+
+        return messenger;
+    }
+}

common/src/main/java/dev/xhyrom/lighteco/common/model/user/User.java

@@ -4,6 +4,7 @@ import dev.xhyrom.lighteco.api.exception.CannotBeGreaterThan;
 import dev.xhyrom.lighteco.api.exception.CannotBeNegative;
 import dev.xhyrom.lighteco.common.api.impl.ApiUser;
 import dev.xhyrom.lighteco.common.cache.RedisBackedMap;
+import dev.xhyrom.lighteco.common.messaging.InternalMessagingService;
 import dev.xhyrom.lighteco.common.model.currency.Currency;
 import dev.xhyrom.lighteco.common.plugin.LightEcoPlugin;
 import lombok.Getter;
@@ -14,6 +15,7 @@ import org.checkerframework.checker.nullness.qual.NonNull;
 import java.math.BigDecimal;
 import java.math.RoundingMode;
 import java.util.HashMap;
+import java.util.Optional;
 import java.util.UUID;
 
 @Getter
@@ -50,10 +52,14 @@ public class User {
     }
 
     public void setBalance(@NonNull Currency currency, @NonNull BigDecimal balance) throws CannotBeNegative, CannotBeGreaterThan {
-        this.setBalance(currency, balance, false);
+        this.setBalance(currency, balance, false, true);
     }
 
     public void setBalance(@NonNull Currency currency, @NonNull BigDecimal balance, boolean force) throws CannotBeNegative, CannotBeGreaterThan {
+        this.setBalance(currency, balance, force, true);
+    }
+
+    public void setBalance(@NonNull Currency currency, @NonNull BigDecimal balance, boolean force, boolean publish) throws CannotBeNegative, CannotBeGreaterThan {
         if (balance.compareTo(BigDecimal.ZERO) < 0) {
             throw new CannotBeNegative("Balance cannot be negative");
         }
@@ -67,6 +73,11 @@ public class User {
 
         if (!force)
             this.setDirty(true);
+
+        if (publish) {
+            @NonNull Optional<InternalMessagingService> messagingService = this.plugin.getMessagingService();
+            messagingService.ifPresent(internalMessagingService -> internalMessagingService.pushUserUpdate(this, currency));
+        }
     }
 
     public void deposit(@NonNull Currency currency, @NonNull BigDecimal amount) throws CannotBeNegative, CannotBeGreaterThan {

common/src/main/java/dev/xhyrom/lighteco/common/plugin/AbstractLightEcoPlugin.java

@@ -6,13 +6,17 @@ import dev.xhyrom.lighteco.common.api.LightEcoApi;
 import dev.xhyrom.lighteco.common.config.Config;
 import dev.xhyrom.lighteco.common.dependencies.DependencyManager;
 import dev.xhyrom.lighteco.common.dependencies.DependencyManagerImpl;
+import dev.xhyrom.lighteco.common.messaging.MessagingFactory;
+import dev.xhyrom.lighteco.common.messaging.InternalMessagingService;
 import dev.xhyrom.lighteco.common.storage.Storage;
 import dev.xhyrom.lighteco.common.storage.StorageFactory;
 import dev.xhyrom.lighteco.common.task.UserSaveTask;
 import eu.okaeri.configs.ConfigManager;
 import eu.okaeri.configs.yaml.snakeyaml.YamlSnakeYamlConfigurer;
 import lombok.Getter;
+import org.checkerframework.checker.nullness.qual.NonNull;
 
+import java.util.Optional;
 import java.util.concurrent.TimeUnit;
 
 @Getter
@@ -23,6 +27,7 @@ public abstract class AbstractLightEcoPlugin implements LightEcoPlugin {
 
     @Getter
     private Storage storage;
+    private InternalMessagingService messagingService;
     private LightEcoApi api;
 
     private UserSaveTask userSaveTask;
@@ -41,10 +46,18 @@ public abstract class AbstractLightEcoPlugin implements LightEcoPlugin {
 
     public final void enable() {
         // setup storage
-        StorageFactory factory = new StorageFactory(this);
+        StorageFactory storageFactory = new StorageFactory(this);
-        this.dependencyManager.loadStorageDependencies(factory.getRequiredTypes());
+        this.dependencyManager.loadStorageDependencies(
+                storageFactory.getRequiredTypes()
+        );
 
-        this.storage = factory.get();
+        MessagingFactory messagingFactory = this.getMessagingFactory();
+        this.dependencyManager.loadMessagingDependencies(
+                messagingFactory.getRequiredTypes()
+        );
+
+        this.storage = storageFactory.get();
+        this.messagingService = messagingFactory.get();
 
         // register listeners
         this.registerListeners();
@@ -74,6 +87,9 @@ public abstract class AbstractLightEcoPlugin implements LightEcoPlugin {
         // shutdown storage
         this.storage.shutdown();
 
+        if (this.messagingService != null)
+            this.messagingService.shutdown();
+
         // close isolated class loaders
         this.dependencyManager.close();
     }
@@ -81,8 +97,14 @@ public abstract class AbstractLightEcoPlugin implements LightEcoPlugin {
     protected abstract void registerListeners();
 
     protected abstract void setupManagers();
+    protected abstract MessagingFactory getMessagingFactory();
     protected abstract void registerApiOnPlatform(LightEco api);
 
     protected abstract void registerPlatformHooks();
     protected abstract void removePlatformHooks();
+
+    @Override
+    public @NonNull Optional<InternalMessagingService> getMessagingService() {
+        return Optional.ofNullable(this.messagingService);
+    }
 }

common/src/main/java/dev/xhyrom/lighteco/common/plugin/LightEcoPlugin.java

@@ -7,10 +7,13 @@ import dev.xhyrom.lighteco.common.dependencies.DependencyManager;
 import dev.xhyrom.lighteco.common.manager.command.CommandManager;
 import dev.xhyrom.lighteco.common.manager.currency.CurrencyManager;
 import dev.xhyrom.lighteco.common.manager.user.UserManager;
+import dev.xhyrom.lighteco.common.messaging.InternalMessagingService;
 import dev.xhyrom.lighteco.common.plugin.bootstrap.LightEcoBootstrap;
 import dev.xhyrom.lighteco.common.storage.Storage;
 import org.checkerframework.checker.nullness.qual.NonNull;
 
+import java.util.Optional;
+
 public interface LightEcoPlugin {
     Platform.@NonNull Type getPlatformType();
 
@@ -24,5 +27,7 @@ public interface LightEcoPlugin {
 
     @NonNull DependencyManager getDependencyManager();
 
+    @NonNull Optional<InternalMessagingService> getMessagingService();
+
     @NonNull Storage getStorage();
 }

common/src/main/java/dev/xhyrom/lighteco/common/storage/StorageFactory.java

@@ -1,6 +1,5 @@
 package dev.xhyrom.lighteco.common.storage;
 
-import com.google.common.collect.ImmutableSet;
 import dev.xhyrom.lighteco.api.storage.StorageProvider;
 import dev.xhyrom.lighteco.common.plugin.LightEcoPlugin;
 import dev.xhyrom.lighteco.common.storage.provider.memory.MemoryStorageProvider;
@@ -21,7 +20,7 @@ public class StorageFactory {
     }
 
     public Set<StorageType> getRequiredTypes() {
-        return ImmutableSet.of(this.plugin.getConfig().storage.provider);
+        return Set.of(this.plugin.getConfig().storage.provider);
     }
 
     public Storage get() {

common/src/main/java/dev/xhyrom/lighteco/common/util/gson/GsonProvider.java

@@ -0,0 +1,12 @@
+package dev.xhyrom.lighteco.common.util.gson;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+
+public final class GsonProvider {
+    private static final Gson GSON = new GsonBuilder().disableHtmlEscaping().create();
+
+    public static Gson get() {
+        return GSON;
+    }
+}

sponge-8/src/main/java/dev/xhyrom/lighteco/sponge/SpongeLightEcoPlugin.java

@@ -6,6 +6,7 @@ import dev.xhyrom.lighteco.api.platform.Platform;
 import dev.xhyrom.lighteco.common.manager.command.CommandManager;
 import dev.xhyrom.lighteco.common.manager.currency.StandardCurrencyManager;
 import dev.xhyrom.lighteco.common.manager.user.StandardUserManager;
+import dev.xhyrom.lighteco.common.messaging.MessagingFactory;
 import dev.xhyrom.lighteco.common.plugin.AbstractLightEcoPlugin;
 import lombok.Getter;
 import org.checkerframework.checker.nullness.qual.NonNull;
@@ -41,6 +42,11 @@ public class SpongeLightEcoPlugin extends AbstractLightEcoPlugin {
         //this.contextManager = new BukkitContextManager();
     }
 
+    @Override
+    protected MessagingFactory getMessagingFactory() {
+        return new MessagingFactory(this);
+    }
+
     @Override
     protected void registerApiOnPlatform(LightEco api) {
         //this.getBootstrap().getServer().getServicesManager().register(LightEco.class, api, this.getBootstrap(), ServicePriority.Normal);