1 /***
2 * Redistribution and use of this software and associated documentation
3 * ("Software"), with or without modification, are permitted provided
4 * that the following conditions are met:
5 *
6 * 1. Redistributions of source code must retain copyright
7 * statements and notices. Redistributions must also contain a
8 * copy of this document.
9 *
10 * 2. Redistributions in binary form must reproduce the
11 * above copyright notice, this list of conditions and the
12 * following disclaimer in the documentation and/or other
13 * materials provided with the distribution.
14 *
15 * 3. The name "Exolab" must not be used to endorse or promote
16 * products derived from this Software without prior written
17 * permission of Exoffice Technologies. For written permission,
18 * please contact tma@netspace.net.au.
19 *
20 * 4. Products derived from this Software may not be called "Exolab"
21 * nor may "Exolab" appear in their names without prior written
22 * permission of Exoffice Technologies. Exolab is a registered
23 * trademark of Exoffice Technologies.
24 *
25 * 5. Due credit should be given to the Exolab Project
26 * (http://www.exolab.org/).
27 *
28 * THIS SOFTWARE IS PROVIDED BY EXOFFICE TECHNOLOGIES AND CONTRIBUTORS
29 * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
30 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
31 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
32 * EXOFFICE TECHNOLOGIES OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
33 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
34 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
35 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
37 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
38 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
39 * OF THE POSSIBILITY OF SUCH DAMAGE.
40 *
41 * Copyright 2001-2004 (C) Exoffice Technologies Inc. All Rights Reserved.
42 *
43 * $Id: EchoListener.java,v 1.3 2004/01/31 13:44:24 tanderson Exp $
44 */
45 package org.exolab.jmscts.core;
46
47 import javax.jms.Message;
48 import javax.jms.MessageListener;
49 import javax.jms.Session;
50
51 import org.apache.log4j.Category;
52
53
54 /***
55 * This helper class implements the {@link MessageListener} interface and
56 * echoes messages to another destination
57 *
58 * @author <a href="mailto:tma@netspace.net.au">Tim Anderson</a>
59 * @version $Revision: 1.3 $
60 */
61 public class EchoListener implements MessageListener {
62
63 /***
64 * The underlying session
65 */
66 private Session _session;
67
68 /***
69 * The sender to echo messages
70 */
71 private MessageSender _sender;
72
73 /***
74 * The number of messages to send
75 */
76 private int _count = 0;
77
78 /***
79 * Determines if transacted sessions should be committed
80 */
81 private boolean _commit = false;
82
83 /***
84 * The logging category
85 */
86 private static final Category log =
87 Category.getInstance(EchoListener.class.getName());
88
89
90 /***
91 * Construct an instance with the sender, the number of messages to
92 * send when {@link #onMessage} is invoked
93 *
94 * @param sender the message sender
95 * @param count the number of messages to send
96 */
97 public EchoListener(MessageSender sender, int count) {
98 this(null, sender, count, false);
99 }
100
101 /***
102 * Construct an instance with the session, sender, the number of messages
103 * to send when {@link #onMessage} is invoked.
104 *
105 * @param session the underlying session
106 * @param sender the message sender
107 * @param count the number of messages to send
108 * @param commit if <code>true</code> and the session is transacted, commit
109 * the session after sending the messages
110 */
111 public EchoListener(Session session, MessageSender sender, int count,
112 boolean commit) {
113 _session = session;
114 _sender = sender;
115 _count = count;
116 _commit = commit;
117 }
118
119 /***
120 * Invoked when the consumer asynchronously receives a message
121 *
122 * @param message the received message
123 */
124 public void onMessage(Message message) {
125 try {
126 _sender.send(message, _count);
127 if (_commit) {
128 if (_session != null && _session.getTransacted()) {
129 _session.commit();
130 }
131 }
132 } catch (Exception exception) {
133 log.error(exception, exception);
134 }
135 }
136
137 }
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