Fixed a serious misuse causing the creation of too many new classes.

The different injectors using CGLib was using a custom CallbackFilter
to optimize the resulting generated class. Unfortunately, the custom
filter didn't properly implement equals() and hashCode(), and so every
time a player logged, a new injector class had to be generated. 

This was fixed by making the injectors share a single CallbackFilter.

In addition, I've begun adding cleanup code that will reset all static
fields once the plugin has unloaded.

ProtocolLib/dependency-reduced-pom.xml

@@ -4,7 +4,7 @@
   <groupId>com.comphenix.protocol</groupId>
   <artifactId>ProtocolLib</artifactId>
   <name>ProtocolLib</name>
-  <version>1.4.3-SNAPSHOT</version>
+  <version>1.4.4-SNAPSHOT</version>
   <description>Provides read/write access to the Minecraft protocol.</description>
   <url>http://dev.bukkit.org/server-mods/protocollib/</url>
   <developers>

ProtocolLib/src/main/java/com/comphenix/protocol/ProtocolLibrary.java

@@ -190,6 +190,10 @@ public class ProtocolLibrary extends JavaPlugin {
 		protocolManager.close();
 		protocolManager = null;
 		statistisc = null;
+		
+		// Leaky ClassLoader begone!
+		CleanupStaticMembers cleanup = new CleanupStaticMembers(getClassLoader(), logger);
+		cleanup.resetAll();
 	}
 	
 	/**

ProtocolLib/src/main/java/com/comphenix/protocol/async/AsyncListenerHandler.java

@@ -54,7 +54,7 @@ public class AsyncListenerHandler {
 	private static final AtomicInteger nextID = new AtomicInteger();
 	
 	// Default queue capacity
-	private static int DEFAULT_CAPACITY = 1024;
+	private static final int DEFAULT_CAPACITY = 1024;
 	
 	// Cancel the async handler
 	private volatile boolean cancelled;

ProtocolLib/src/main/java/com/comphenix/protocol/injector/PacketConstructor.java

@@ -41,7 +41,7 @@ public class PacketConstructor {
 	 * <p>
 	 * Remember to call withPacket().
 	 */
-	public static final PacketConstructor DEFAULT = new PacketConstructor(null);
+	public static PacketConstructor DEFAULT = new PacketConstructor(null);
 	
 	// The constructor method that's actually responsible for creating the packet
 	private Constructor<?> constructorMethod;

ProtocolLib/src/main/java/com/comphenix/protocol/injector/player/NetworkObjectInjector.java

@@ -51,6 +51,9 @@ class NetworkObjectInjector extends PlayerInjector {
 	// Used to construct proxy objects
 	private ClassLoader classLoader;
 
+	// Shared callback filter - avoid creating a new class every time
+	private static CallbackFilter callbackFilter;
+	
 	public NetworkObjectInjector(ClassLoader classLoader, Logger logger, Player player, 
 								 ListenerInvoker invoker, IntegerSet sendingFilters) throws IllegalAccessException {
 		super(logger, player, invoker);
@@ -131,12 +134,9 @@ class NetworkObjectInjector extends PlayerInjector {
 				}
 			};
 			
-			// Create our proxy object
-			Enhancer ex = new Enhancer();
-			ex.setClassLoader(classLoader);
-			ex.setSuperclass(networkInterface);
-			ex.setCallbacks(new Callback[] { queueFilter, dispatch });
-			ex.setCallbackFilter(new CallbackFilter() {
+			// Share callback filter - that way, we avoid generating a new class every time.
+			if (callbackFilter == null) {
+				callbackFilter = new CallbackFilter() {
 					@Override
 					public int accept(Method method) {
 						if (method.equals(queueMethod))
@@ -144,7 +144,15 @@ class NetworkObjectInjector extends PlayerInjector {
 						else
 							return 1;
 					}
-			});
+				};
+			}
+			
+			// Create our proxy object
+			Enhancer ex = new Enhancer();
+			ex.setClassLoader(classLoader);
+			ex.setSuperclass(networkInterface);
+			ex.setCallbacks(new Callback[] { queueFilter, dispatch });
+			ex.setCallbackFilter(callbackFilter);
 			
 			// Inject it, if we can.
 			networkManagerRef.setValue(ex.create());

ProtocolLib/src/main/java/com/comphenix/protocol/injector/player/NetworkServerInjector.java

@@ -52,6 +52,8 @@ import com.comphenix.protocol.reflect.instances.ExistingGenerator;
  */
 public class NetworkServerInjector extends PlayerInjector {
 
+	private volatile static CallbackFilter callbackFilter;
+	
 	private static Field disconnectField;
 	private static Method sendPacketMethod;
 	private InjectedServerConnection serverInjection;
@@ -170,10 +172,10 @@ public class NetworkServerInjector extends PlayerInjector {
 		};
 		Callback noOpCallback = NoOp.INSTANCE;
 
-		ex.setClassLoader(classLoader);
-		ex.setSuperclass(serverClass);
-		ex.setCallbacks(new Callback[] { sendPacketCallback, noOpCallback });
-		ex.setCallbackFilter(new CallbackFilter() {
+		// Share callback filter - that way, we avoid generating a new class for 
+		// every logged in player.
+		if (callbackFilter == null) {
+			callbackFilter = new CallbackFilter() {
 				@Override
 				public int accept(Method method) {
 					if (method.equals(sendPacketMethod))
@@ -181,7 +183,13 @@ public class NetworkServerInjector extends PlayerInjector {
 					else
 						return 1;
 				}
-		});
+			};
+		}
+		
+		ex.setClassLoader(classLoader);
+		ex.setSuperclass(serverClass);
+		ex.setCallbacks(new Callback[] { sendPacketCallback, noOpCallback });
+		ex.setCallbackFilter(callbackFilter);
 		
 		// Find the Minecraft NetServerHandler superclass
 		Class<?> minecraftSuperClass = getFirstMinecraftSuperClass(serverHandler.getClass());
@@ -208,6 +216,7 @@ public class NetworkServerInjector extends PlayerInjector {
 		if (proxyObject != null) {
 			// This will be done by InjectedServerConnection instead
 			//copyTo(serverHandler, proxyObject);
+			
 			serverInjection.replaceServerHandler(serverHandler, proxyObject);
 			serverHandlerRef.setValue(proxyObject);
 			return true;

ProtocolLib/src/main/java/com/comphenix/protocol/injector/player/TemporaryPlayerFactory.java

@@ -42,6 +42,9 @@ class TemporaryPlayerFactory {
 	// Helpful constructors
 	private final PacketConstructor chatPacket;
 	
+	// Prevent too many class creations
+	private static CallbackFilter callbackFilter;
+	
 	public TemporaryPlayerFactory() {
 		chatPacket =  PacketConstructor.DEFAULT.withPacket(3, new Object[] { "DEMO" });
 	}
@@ -120,12 +123,9 @@ class TemporaryPlayerFactory {
 			}
     	};
 		
-		// CGLib is amazing
-    	Enhancer ex = new Enhancer();
-    	ex.setSuperclass(InjectContainer.class);
-    	ex.setInterfaces(new Class[] { Player.class });
-		ex.setCallbacks(new Callback[] { NoOp.INSTANCE, implementation });
-		ex.setCallbackFilter(new CallbackFilter() {
+		// Shared callback filter
+		if (callbackFilter == null) {
+			callbackFilter = new CallbackFilter() {
 				@Override
 				public int accept(Method method) {
 					// Do not override the object method or the superclass methods
@@ -135,7 +135,15 @@ class TemporaryPlayerFactory {
 					else 
 						return 1;
 				}
-		});
+			};
+		}
+    	
+		// CGLib is amazing
+    	Enhancer ex = new Enhancer();
+    	ex.setSuperclass(InjectContainer.class);
+    	ex.setInterfaces(new Class[] { Player.class });
+		ex.setCallbacks(new Callback[] { NoOp.INSTANCE, implementation });
+		ex.setCallbackFilter(callbackFilter);
     	
     	return (Player) ex.create();
 	}