1/*
2 * Copyright (C) 2007 The Guava Authors
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.google.common.eventbus;
18
19import java.lang.reflect.InvocationTargetException;
20import java.lang.reflect.Method;
21
22/**
23 * Wraps a single-argument subscriber method on a specific object, and ensures
24 * that only one thread may enter the method at a time.
25 *
26 * <p>Beyond synchronization, this class behaves identically to
27 * {@link EventSubscriber}.
28 *
29 * @author Cliff Biffle
30 */
31final class SynchronizedEventSubscriber extends EventSubscriber {
32  /**
33   * Creates a new SynchronizedEventSubscriber to wrap {@code method} on
34   * {@code target}.
35   *
36   * @param target  object to which the method applies.
37   * @param method  subscriber method.
38   */
39  public SynchronizedEventSubscriber(Object target, Method method) {
40    super(target, method);
41  }
42
43  @Override
44  public void handleEvent(Object event) throws InvocationTargetException {
45    // https://code.google.com/p/guava-libraries/issues/detail?id=1403
46    synchronized (this) {
47      super.handleEvent(event);
48    }
49  }
50}
51