| IteratorDispatcherDestination.java |
1 /**
2 * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to deal
6 * in the Software without restriction, including without limitation the rights
7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8 * copies of the Software, and to permit persons to whom the Software is
9 * furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20 * SOFTWARE.
21 */
22
23 package com.liferay.portal.kernel.messaging;
24
25 import com.liferay.portal.kernel.log.Log;
26 import com.liferay.portal.kernel.log.LogFactoryUtil;
27 import com.liferay.portal.kernel.util.ConcurrentHashSet;
28
29 import java.util.Iterator;
30 import java.util.Set;
31 import java.util.concurrent.ThreadPoolExecutor;
32
33 /**
34 * <a href="IteratorDispatcherDestination.java.html"><b><i>View Source</i></b>
35 * </a>
36 *
37 * @author Michael C. Han
38 * @author Brian Wing Shun Chan
39 *
40 */
41 public abstract class IteratorDispatcherDestination extends BaseDestination {
42
43 public IteratorDispatcherDestination(String name) {
44 super(name);
45 }
46
47 public IteratorDispatcherDestination(
48 String name, int workersCoreSize, int workersMaxSize) {
49
50 super(name, workersCoreSize, workersMaxSize);
51 }
52
53 public void register(MessageListener listener) {
54 listener = new InvokerMessageListener(listener);
55
56 _listeners.add(listener);
57 }
58
59 public void send(Message message) {
60 if (_listeners.size() == 0) {
61 if (_log.isDebugEnabled()) {
62 _log.debug("No listeners for destination " + getName());
63 }
64
65 return;
66 }
67
68 ThreadPoolExecutor threadPoolExecutor = getThreadPoolExecutor();
69
70 if (threadPoolExecutor.isShutdown()) {
71 throw new IllegalStateException(
72 "Destination " + getName() + " is shutdown and cannot " +
73 "receive more messages");
74 }
75
76 dispatch(_listeners.iterator(), message);
77 }
78
79 public boolean unregister(MessageListener listener) {
80 listener = new InvokerMessageListener(listener);
81
82 return _listeners.remove(listener);
83 }
84
85 public int getListenerCount() {
86 return _listeners.size();
87 }
88
89 protected abstract void dispatch(
90 Iterator<MessageListener> listenersItr, Message message);
91
92 private static Log _log =
93 LogFactoryUtil.getLog(IteratorDispatcherDestination.class);
94
95 private Set<MessageListener> _listeners =
96 new ConcurrentHashSet<MessageListener>();
97
98 }