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.Set;
30  import java.util.concurrent.ThreadPoolExecutor;
31  
32  /**
33   * <a href="ArrayDispatcherDestination.java.html"><b><i>View Source</i></b></a>
34   *
35   * @author Michael C. Han
36   * @author Brian Wing Shun Chan
37   *
38   */
39  public abstract class ArrayDispatcherDestination extends BaseDestination {
40  
41      public ArrayDispatcherDestination(String name) {
42          super(name);
43      }
44  
45      public ArrayDispatcherDestination(
46          String name, int workersCoreSize, int workersMaxSize) {
47  
48          super(name, workersCoreSize, workersMaxSize);
49      }
50  
51      public int getListenerCount() {
52          return _listeners.size();
53      }
54  
55      public void register(MessageListener listener) {
56          listener = new InvokerMessageListener(listener);
57  
58          _listeners.add(listener);
59      }
60  
61      public void send(Message message) {
62          if (_listeners.isEmpty()) {
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, message);
79      }
80  
81      public boolean unregister(MessageListener listener) {
82          listener = new InvokerMessageListener(listener);
83  
84          return _listeners.remove(listener);
85      }
86  
87      protected abstract void dispatch(
88          Set<MessageListener> listeners, Message message);
89  
90      private static Log _log =
91          LogFactoryUtil.getLog(ArrayDispatcherDestination.class);
92  
93      private Set<MessageListener> _listeners =
94          new ConcurrentHashSet<MessageListener>();
95  
96  }