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              if (_log.isDebugEnabled()) {
66                  _log.debug(e, e);
67              }
68  
69              proxyResponse.setException(e);
70          }
71          finally {
72              String responseDestinationName =
73                  message.getResponseDestinationName();
74  
75              if (Validator.isNotNull(responseDestinationName)) {
76                  Message responseMessage = MessageBusUtil.createResponseMessage(
77                      message);
78  
79                  responseMessage.setPayload(proxyResponse);
80  
81                  _messageBus.sendMessage(
82                      responseDestinationName, responseMessage);
83              }
84          }
85      }
86  
87      public void setManager(Object manager) {
88          _manager = manager;
89      }
90  
91      public void setMessageBus(MessageBus messageBus) {
92          _messageBus = messageBus;
93      }
94  
95      private static Log _log = LogFactoryUtil.getLog(ProxyMessageListener.class);
96  
97      private Object _manager;
98      private MessageBus _messageBus;
99  
100 }