| SynchronousMessageListener.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.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 }