1   /**
2    * Copyright (c) 2000-2008 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(Object 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 void send(String message) {
80          if (_listeners.size() == 0) {
81              if (_log.isDebugEnabled()) {
82                  _log.debug("No listeners for destination " + getName());
83              }
84  
85              return;
86          }
87  
88          ThreadPoolExecutor threadPoolExecutor = getThreadPoolExecutor();
89  
90          if (threadPoolExecutor.isShutdown()) {
91              throw new IllegalStateException(
92                  "Destination " + getName() + " is shutdown and cannot " +
93                      "receive more messages");
94          }
95  
96          dispatch(_listeners.iterator(), message);
97      }
98  
99      public boolean unregister(MessageListener listener) {
100         listener = new InvokerMessageListener(listener);
101 
102         return _listeners.remove(listener);
103     }
104 
105     protected abstract void dispatch(
106         Iterator<MessageListener> listenersItr, Object message);
107 
108     protected abstract void dispatch(
109         Iterator<MessageListener> listenersItr, String message);
110 
111     private static Log _log = LogFactoryUtil.getLog(BaseDestination.class);
112 
113     private Set<MessageListener> _listeners =
114         new ConcurrentHashSet<MessageListener>();
115 
116 }