| SynchronousMessageListener.java |
1 /**
2 * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3 *
4 * The contents of this file are subject to the terms of the Liferay Enterprise
5 * Subscription License ("License"). You may not use this file except in
6 * compliance with the License. You can obtain a copy of the License by
7 * contacting Liferay, Inc. See the License for the specific language governing
8 * permissions and limitations under the License, including but not limited to
9 * distribution rights of the Software.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
12 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
14 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
15 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
16 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
17 * SOFTWARE.
18 */
19
20 package com.liferay.portal.kernel.messaging.sender;
21
22 import com.liferay.portal.kernel.messaging.Message;
23 import com.liferay.portal.kernel.messaging.MessageBus;
24 import com.liferay.portal.kernel.messaging.MessageBusException;
25 import com.liferay.portal.kernel.messaging.MessageListener;
26
27 /**
28 * <a href="SynchronousMessageListener.java.html"><b><i>View Source</i></b></a>
29 *
30 * @author Michael C. Han
31 *
32 */
33 public class SynchronousMessageListener implements MessageListener {
34
35 public SynchronousMessageListener(
36 MessageBus messageBus, Message message, long timeout) {
37
38 _messageBus = messageBus;
39 _message = message;
40 _timeout = timeout;
41 _responseId = _message.getResponseId();
42 }
43
44 public Object getResults() {
45 return _results;
46 }
47
48 public void receive(Message message) {
49 if (!message.getResponseId().equals(_responseId)) {
50 return;
51 }
52
53 synchronized (this) {
54 _results = message.getPayload();
55
56 notify();
57 }
58 }
59
60 public Object send() throws MessageBusException {
61 String destination = _message.getDestination();
62 String responseDestination = _message.getResponseDestination();
63
64 _messageBus.registerMessageListener(responseDestination, this);
65
66 try {
67 synchronized (this) {
68 _messageBus.sendMessage(destination, _message);
69
70 wait(_timeout);
71
72 if (_results == null) {
73 throw new MessageBusException(
74 "No reply received for message: " + _message);
75 }
76 }
77
78 return _results;
79 }
80 catch (InterruptedException ie) {
81 throw new MessageBusException(
82 "Message sending interrupted for: " + _message, ie);
83 }
84 finally {
85 _messageBus.unregisterMessageListener(responseDestination, this);
86 }
87 }
88
89 private MessageBus _messageBus;
90 private Message _message;
91 private long _timeout;
92 private String _responseId;
93 private Object _results;
94
95 }