| 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 setListenerCount(_listeners.size());
59 }
60
61 public void send(Message message) {
62 if (_listeners.size() == 0) {
63 if (_log.isDebugEnabled()) {
64 _log.debug("No listeners for destination " + getName());
65 }
66
67 return;
68 }
69
70 ThreadPoolExecutor threadPoolExecutor = getThreadPoolExecutor();
71
72 if (threadPoolExecutor.isShutdown()) {
73 throw new IllegalStateException(
74 "Destination " + getName() + " is shutdown and cannot " +
75 "receive more messages");
76 }
77
78 dispatch(_listeners.iterator(), message);
79 }
80
81 public boolean unregister(MessageListener listener) {
82 listener = new InvokerMessageListener(listener);
83
84 boolean value = _listeners.remove(listener);
85
86 setListenerCount(_listeners.size());
87
88 return value;
89 }
90
91 protected abstract void dispatch(
92 Iterator<MessageListener> listenersItr, Message message);
93
94 private static Log _log = LogFactoryUtil.getLog(BaseDestination.class);
95
96 private Set<MessageListener> _listeners =
97 new ConcurrentHashSet<MessageListener>();
98
99 }