1
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
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 }