| ProxyMessageListener.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.proxy;
24
25 import com.liferay.portal.kernel.log.Log;
26 import com.liferay.portal.kernel.log.LogFactoryUtil;
27 import com.liferay.portal.kernel.messaging.Message;
28 import com.liferay.portal.kernel.messaging.MessageBus;
29 import com.liferay.portal.kernel.messaging.MessageBusUtil;
30 import com.liferay.portal.kernel.messaging.MessageListener;
31 import com.liferay.portal.kernel.util.Validator;
32
33 /**
34 * <a href="ProxyMessageListener.java.html"><b><i>View Source</i></b></a>
35 *
36 * @author Micha Kiener
37 * @author Michael C. Han
38 * @author Brian Wing Shun Chan
39 */
40 public class ProxyMessageListener implements MessageListener {
41
42 public void receive(Message message) {
43 ProxyResponse proxyResponse = new ProxyResponse();
44
45 try {
46 Object payload = message.getPayload();
47
48 if (payload == null) {
49 throw new Exception("Payload is null");
50 }
51 else if (!ProxyRequest.class.isAssignableFrom(payload.getClass())) {
52 throw new Exception(
53 "Payload " + payload.getClass() + " is not of type " +
54 ProxyRequest.class.getName());
55 }
56 else {
57 ProxyRequest proxyRequest = (ProxyRequest)payload;
58
59 Object result = proxyRequest.execute(_manager);
60
61 proxyResponse.setResult(result);
62 }
63 }
64 catch (Exception e) {
65 _log.error(e, e);
66
67 proxyResponse.setException(e);
68 }
69 finally {
70 String responseDestinationName =
71 message.getResponseDestinationName();
72
73 if (Validator.isNotNull(responseDestinationName)) {
74 Message responseMessage = MessageBusUtil.createResponseMessage(
75 message);
76
77 responseMessage.setPayload(proxyResponse);
78
79 _messageBus.sendMessage(
80 responseDestinationName, responseMessage);
81 }
82 }
83 }
84
85 public void setManager(Object manager) {
86 _manager = manager;
87 }
88
89 public void setMessageBus(MessageBus messageBus) {
90 _messageBus = messageBus;
91 }
92
93 private static Log _log = LogFactoryUtil.getLog(ProxyMessageListener.class);
94
95 private Object _manager;
96 private MessageBus _messageBus;
97
98 }