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.sender;
24  
25  import com.liferay.portal.kernel.messaging.Message;
26  import com.liferay.portal.kernel.messaging.MessageBus;
27  import com.liferay.portal.kernel.messaging.MessageBusException;
28  import com.liferay.portal.kernel.messaging.MessageListener;
29  
30  /**
31   * <a href="SynchronousMessageListener.java.html"><b><i>View Source</i></b></a>
32   *
33   * @author Michael C. Han
34   *
35   */
36  public class SynchronousMessageListener implements MessageListener {
37  
38      public SynchronousMessageListener(
39          MessageBus messageBus, Message message, long timeout) {
40  
41          _messageBus = messageBus;
42          _message = message;
43          _timeout = timeout;
44          _responseId = _message.getResponseId();
45      }
46  
47      public Object getResults() {
48          return _results;
49      }
50  
51      public void receive(Message message) {
52          if (!message.getResponseId().equals(_responseId)) {
53              return;
54          }
55  
56          synchronized (this) {
57              _results = message.getPayload();
58  
59              notify();
60          }
61      }
62  
63      public Object send() throws MessageBusException {
64          String destination = _message.getDestination();
65          String responseDestination = _message.getResponseDestination();
66  
67          _messageBus.registerMessageListener(responseDestination, this);
68  
69          try {
70              synchronized (this) {
71                  _messageBus.sendMessage(destination, _message);
72  
73                  wait(_timeout);
74  
75                  if (_results == null) {
76                      throw new MessageBusException(
77                          "No reply received for message: " + _message);
78                  }
79              }
80  
81              return _results;
82          }
83          catch (InterruptedException ie) {
84              throw new MessageBusException(
85                  "Message sending interrupted for: " + _message, ie);
86          }
87          finally {
88              _messageBus.unregisterMessageListener(responseDestination, this);
89          }
90      }
91  
92      private MessageBus _messageBus;
93      private Message _message;
94      private long _timeout;
95      private String _responseId;
96      private Object _results;
97  
98  }