Plugin enabling & disabling

src/main/java/emu/grasscutter/Grasscutter.java

@@ -8,6 +8,7 @@ import java.io.InputStreamReader;
 import java.net.InetSocketAddress;
 
 import emu.grasscutter.command.CommandMap;
+import emu.grasscutter.plugin.PluginManager;
 import emu.grasscutter.utils.Utils;
 import org.reflections.Reflections;
 import org.slf4j.LoggerFactory;
@@ -33,6 +34,7 @@ public final class Grasscutter {
 	public static RunMode MODE = RunMode.BOTH;
 	private static DispatchServer dispatchServer;
 	private static GameServer gameServer;
+	private static PluginManager pluginManager;
 	
 	public static final Reflections reflector = new Reflections();
 	
@@ -52,15 +54,11 @@ public final class Grasscutter {
     	
 		for (String arg : args) {
 			switch (arg.toLowerCase()) {
-				case "-auth":
-					MODE = RunMode.AUTH;
-					break;
-				case "-game":
-					MODE = RunMode.GAME;
-					break;
-				case "-handbook":
-					Tools.createGmHandbook();
-					return;
+				case "-auth" -> MODE = RunMode.AUTH;
+				case "-game" -> MODE = RunMode.GAME;
+				case "-handbook" -> {
+					Tools.createGmHandbook(); return;
+				}
 			}
 		}
 		
@@ -72,18 +70,20 @@ public final class Grasscutter {
 		// Database
 		DatabaseManager.initialize();
 
+		// Create server instances.
+		dispatchServer = new DispatchServer();
+		gameServer = new GameServer(new InetSocketAddress(getConfig().getGameServerOptions().Ip, getConfig().getGameServerOptions().Port));
+		
+		// Create plugin manager instance.
+		pluginManager = new PluginManager();
+		
 		// Start servers.
 		if(getConfig().RunMode.equalsIgnoreCase("HYBRID")) {
-			dispatchServer = new DispatchServer();
 			dispatchServer.start();
-
-			gameServer = new GameServer(new InetSocketAddress(getConfig().getGameServerOptions().Ip, getConfig().getGameServerOptions().Port));
 			gameServer.start();
-		} else if(getConfig().RunMode.equalsIgnoreCase("DISPATCH_ONLY")) {
-			dispatchServer = new DispatchServer();
+		} else if (getConfig().RunMode.equalsIgnoreCase("DISPATCH_ONLY")) {
 			dispatchServer.start();
-		} else if(getConfig().RunMode.equalsIgnoreCase("GAME_ONLY")) {
-			gameServer = new GameServer(new InetSocketAddress(getConfig().getGameServerOptions().Ip, getConfig().getGameServerOptions().Port));
+		} else if (getConfig().RunMode.equalsIgnoreCase("GAME_ONLY")) {
 			gameServer.start();
 		} else {
 			getLogger().error("Invalid server run mode. " + getConfig().RunMode);
@@ -92,10 +92,21 @@ public final class Grasscutter {
 			System.exit(1);
 		}
 		
-
+		// Enable all plugins.
+		pluginManager.enablePlugins();
 		
 		// Open console.
 		startConsole();
+		// Hook into shutdown event.
+		Runtime.getRuntime().addShutdownHook(new Thread(Grasscutter::onShutdown));
+    }
+
+	/**
+	 * Server shutdown event.
+	 */
+	private static void onShutdown() {
+		// Disable all plugins.
+		pluginManager.disablePlugins();
 	}
 	
 	public static void loadConfig() {
@@ -112,7 +123,7 @@ public final class Grasscutter {
 		try (FileWriter file = new FileWriter(configFile)) {
 			file.write(gson.toJson(config));
 		} catch (Exception e) {
-			Grasscutter.getLogger().error("Config save error");
+			Grasscutter.getLogger().error("Unable to save config file.");
 		}
 	}
 	
@@ -122,13 +133,13 @@ public final class Grasscutter {
 			while ((input = br.readLine()) != null) {
 				try {
 					if(getConfig().RunMode.equalsIgnoreCase("DISPATCH_ONLY")) {
-						getLogger().error("Commands are not supported in dispatch only mode");
+						getLogger().error("Commands are not supported in dispatch only mode.");
 						return;
 					}
+					
 					CommandMap.getInstance().invoke(null, input);
 				} catch (Exception e) {
-					Grasscutter.getLogger().error("Command error: ");
-					e.printStackTrace();
+					Grasscutter.getLogger().error("Command error:", e);
 				}
 			}
 		} catch (Exception e) {
@@ -161,4 +172,8 @@ public final class Grasscutter {
 	public static GameServer getGameServer() {
 		return gameServer;
 	}
+	
+	public static PluginManager getPluginManager() {
+		return pluginManager;
+	}
 }

src/main/java/emu/grasscutter/plugin/Plugin.java

@@ -7,22 +7,18 @@ import emu.grasscutter.server.game.GameServer;
  * The base class for all plugins to extend.
  */
 public abstract class Plugin {
-    private final PluginIdentifier identifier;
+    private PluginIdentifier identifier;
 
     /**
-     * Empty constructor for developers.
-     * Should not be called by users.
-     */
-    public Plugin() {
-        this(new PluginIdentifier("", "", "", new String[]{}));
-    }
-    
-    /**
-     * Constructor for plugins.
+     * This method is reflected into.
+     * 
+     * Set plugin variables.
      * @param identifier The plugin's identifier.
      */
-    public Plugin(PluginIdentifier identifier) {
+    private void initializePlugin(PluginIdentifier identifier) {
+        if(this.identifier == null)
             this.identifier = identifier;
+        else Grasscutter.getLogger().warn(this.identifier.name + " had a reinitialization attempt.");
     }
 
     /**

src/main/java/emu/grasscutter/plugin/PluginManager.java

@@ -5,13 +5,13 @@ import emu.grasscutter.utils.Utils;
 
 import java.io.File;
 import java.io.InputStreamReader;
+import java.lang.reflect.Method;
 import java.net.URL;
 import java.net.URLClassLoader;
 import java.util.Arrays;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
-import java.util.stream.Collectors;
 
 /**
  * Manages the server's plugins & the event system.
@@ -42,7 +42,7 @@ public final class PluginManager {
         
         List<File> plugins = Arrays.stream(files)
                 .filter(file -> file.getName().endsWith(".jar"))
-                .collect(Collectors.toList());
+                .toList();
         
         plugins.forEach(plugin -> {
             try {
@@ -59,9 +59,8 @@ public final class PluginManager {
                     }
                     
                     Class<?> pluginClass = loader.loadClass(pluginConfig.mainClass);
-                    Plugin pluginInstance = (Plugin) pluginClass.getDeclaredConstructor(PluginIdentifier.class)
-                            .newInstance(PluginIdentifier.fromPluginConfig(pluginConfig));
-                    this.loadPlugin(pluginInstance);
+                    Plugin pluginInstance = (Plugin) pluginClass.getDeclaredConstructor().newInstance();
+                    this.loadPlugin(pluginInstance, PluginIdentifier.fromPluginConfig(pluginConfig));
                     
                     fileReader.close(); // Close the file reader.
                 } catch (ClassNotFoundException ignored) {
@@ -77,11 +76,20 @@ public final class PluginManager {
      * Load the specified plugin.
      * @param plugin The plugin instance.
      */
-    private void loadPlugin(Plugin plugin) {
-        Grasscutter.getLogger().info("Loading plugin: " + plugin.getName());
+    private void loadPlugin(Plugin plugin, PluginIdentifier identifier) {
+        Grasscutter.getLogger().info("Loading plugin: " + identifier.name);
+        
+        // Add the plugin's identifier.
+        try {
+            Class<Plugin> pluginClass = Plugin.class;
+            Method method = pluginClass.getDeclaredMethod("initializePlugin", PluginIdentifier.class);
+            method.setAccessible(true); method.invoke(plugin, identifier); method.setAccessible(false);
+        } catch (Exception ignored) {
+            Grasscutter.getLogger().warn("Failed to add plugin identifier: " + identifier.name);
+        }
         
         // Add the plugin to the list of loaded plugins.
-        this.plugins.put(plugin.getName(), plugin);
+        this.plugins.put(identifier.name, plugin);
         // Call the plugin's onLoad method.
         plugin.onLoad();
     }
@@ -90,13 +98,19 @@ public final class PluginManager {
      * Enables all registered plugins.
      */
     public void enablePlugins() {
-        
+        this.plugins.forEach((name, plugin) -> {
+            Grasscutter.getLogger().info("Enabling plugin: " + name);
+            plugin.onEnable();
+        });
     }
     
     /**
      * Disables all registered plugins.
      */
     public void disablePlugins() {
-        
+        this.plugins.forEach((name, plugin) -> {
+            Grasscutter.getLogger().info("Disabling plugin: " + name);
+            plugin.onDisable();
+        });
     }
 }
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