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 2003-2004 (C) Exoffice Technologies Inc. All Rights Reserved.
42 *
43 * $Id: DelegatingListener.java,v 1.2 2004/01/31 13:44:24 tanderson Exp $
44 */
45 package org.exolab.jmscts.core;
46
47 import java.util.ArrayList;
48 import java.util.Iterator;
49 import java.util.List;
50
51 import javax.jms.Message;
52 import javax.jms.MessageListener;
53
54
55 /***
56 * A listener which delegates to one or more registered listeners
57 *
58 * @version $Revision: 1.2 $ $Date: 2004/01/31 13:44:24 $
59 * @author <a href="mailto:tma@netspace.net.au">Tim Anderson</a>
60 */
61 public class DelegatingListener implements MessageListener {
62
63 /***
64 * The listeners
65 */
66 private List _listeners = new ArrayList();
67
68
69 /***
70 * Construct a new <code>DelegatingListener</code>
71 */
72 public DelegatingListener() {
73 }
74
75 /***
76 * Construct a new <code>DelegatingListener</code>, and register
77 * an initial listener
78 *
79 * @param listener the listener to register
80 */
81 public DelegatingListener(MessageListener listener) {
82 addMessageListener(listener);
83 }
84
85 /***
86 * Invokes <code>MessageListener.onMessage()</code> for each of
87 * the registered listeners
88 *
89 * @param message the received message
90 */
91 public void onMessage(Message message) {
92 Iterator iterator = _listeners.iterator();
93 while (iterator.hasNext()) {
94 MessageListener listener = (MessageListener) iterator.next();
95 listener.onMessage(message);
96 }
97 }
98
99 /***
100 * Register a message listener
101 *
102 * @param listener the listener to register
103 */
104 public void addMessageListener(MessageListener listener) {
105 _listeners.add(listener);
106 }
107
108 /***
109 * Deregister a message listener
110 *
111 * @param listener the listener to deregister
112 */
113 public void removeMessageListener(MessageListener listener) {
114 _listeners.remove(listener);
115 }
116
117 }
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