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, 2003 (C) Exoffice Technologies Inc. All Rights Reserved.
42 *
43 * $Id: CachingListener.java,v 1.4 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.List;
49
50 import javax.jms.Message;
51
52
53 /***
54 * Helper class for receiving messages asynchronously and caching them
55 *
56 * @version $Revision: 1.4 $ $Date: 2004/01/31 13:44:24 $
57 * @author <a href="mailto:tma@netspace.net.au">Tim Anderson</a>
58 */
59 public class CachingListener extends CountingListener {
60
61 /***
62 * The list of received messages
63 */
64 private List _messages;
65
66
67 /***
68 * Construct an instance of the listener, with the number of messages
69 * expected to be received. When this count is reached, the listener
70 * notifies the waiting client (if any)
71 *
72 * @param expected the number of messages expected
73 */
74 public CachingListener(int expected) {
75 super(expected);
76 }
77
78 /***
79 * This method is asynchronously invoked by the message consumer when
80 * a message becomes available.
81 *
82 * @param message the received message
83 */
84 public synchronized void onMessage(Message message) {
85 if (_messages == null) {
86 _messages = new ArrayList(getExpected());
87 }
88 _messages.add(message);
89 super.onMessage(message);
90 }
91
92 /***
93 * Returns the list of received messages
94 *
95 * @return the list of received messages, or null, if no messages have
96 * been received
97 */
98 public synchronized List getMessages() {
99 return _messages;
100 }
101
102 } //-- CachingListener
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