Support asynchronous events; Addresses BUKKIT-1212

By: Wesley Wolfe <weswolf@aol.com>

paper-api/src/test/java/org/bukkit/TestServer.java

@@ -0,0 +1,48 @@
+package org.bukkit;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationHandler;
+import java.lang.reflect.Method;
+import java.lang.reflect.Proxy;
+import java.util.HashMap;
+
+
+public class TestServer implements InvocationHandler {
+    private static interface MethodHandler {
+        Object handle(TestServer server, Object[] args);
+    }
+    private static final Constructor<? extends Server> constructor;
+    private static final HashMap<Method, MethodHandler> methods = new HashMap<Method, MethodHandler>();
+    static {
+        try {
+            methods.put(Server.class.getMethod("isPrimaryThread"),
+                new MethodHandler() {
+                    public Object handle(TestServer server, Object[] args) {
+                        return Thread.currentThread().equals(server.creatingThread);
+                    }
+                });
+            constructor = Proxy.getProxyClass(Server.class.getClassLoader(), Server.class).asSubclass(Server.class).getConstructor(InvocationHandler.class);
+        } catch (Throwable t) {
+            throw new Error(t);
+        }
+    }
+
+    private Thread creatingThread = Thread.currentThread();
+    private TestServer() {};
+
+    public static Server getInstance() {
+        try {
+            return constructor.newInstance(new TestServer());
+        } catch (Throwable t) {
+            throw new RuntimeException(t);
+        }
+    }
+
+    public Object invoke(Object proxy, Method method, Object[] args) {
+        MethodHandler handler = methods.get(method);
+        if (handler != null) {
+            return handler.handle(this, args);
+        }
+        throw new UnsupportedOperationException(String.valueOf(method));
+    }
+}