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 info@exolab.org.
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 2000-2004 (C) Exoffice Technologies Inc. All Rights Reserved.
42 *
43 * $Id: JmsTopicConnectionConsumer.java,v 1.5 2004/01/11 02:33:45 tanderson Exp $
44 */
45 package org.exolab.jms.client;
46
47 import javax.jms.ConnectionConsumer;
48 import javax.jms.JMSException;
49 import javax.jms.MessageListener;
50 import javax.jms.ServerSessionPool;
51 import javax.jms.Session;
52 import javax.jms.Topic;
53 import javax.jms.TopicConnection;
54 import javax.jms.TopicSession;
55 import javax.jms.TopicSubscriber;
56
57
58 /***
59 * Client implementation of the <code>javax.jms.ConnectionConsumer</code>
60 * interface, for topics.
61 *
62 * @version $Revision: 1.5 $ $Date: 2004/01/11 02:33:45 $
63 * @author <a href="mailto:jima@exoffice.com">Jim Alateras</a>
64 * @author <a href="mailto:tma@netspace.net.au">Tim Anderson</a>
65 */
66 class JmsTopicConnectionConsumer extends JmsConnectionConsumer {
67
68 /***
69 * The session to receive messages via.
70 */
71 private TopicSession _session;
72
73 /***
74 * The subscriber of messages
75 */
76 private TopicSubscriber _subscriber;
77
78
79 /***
80 * Construct a new, non-durable <code>JmsTopicConnectionConsumer</code>
81 *
82 * @param connection the connection which created this
83 * @param topic the topic to access
84 * @param pool the server session pool
85 * @param selector the message selector. May be <code>null</code>
86 * @param maxMessages the maximum number of messages that can be assigned
87 * to a server session at one time
88 * @throws JMSException if the consumer cannot be constructed
89 */
90 public JmsTopicConnectionConsumer(TopicConnection connection, Topic topic,
91 ServerSessionPool pool, String selector,
92 int maxMessages)
93 throws JMSException {
94 this(connection, topic, null, pool, selector, maxMessages);
95 }
96
97 /***
98 * Construct a new <code>JmsTopicConnectionConsumer</code>
99 *
100 * @param connection the connection which created this
101 * @param topic the topic to access
102 * @param subscriptionName the durable subscription name.
103 * May be <code>null</code>
104 * @param pool the server session pool
105 * @param selector the message selector. May be <code>null</code>
106 * @param maxMessages the maximum number of messages that can be assigned
107 * to a server session at one time
108 * @throws JMSException if the consumer cannot be constructed
109 */
110 public JmsTopicConnectionConsumer(
111 TopicConnection connection, Topic topic, String subscriptionName,
112 ServerSessionPool pool, String selector, int maxMessages)
113 throws JMSException {
114 super(pool, maxMessages);
115
116 _session = connection.createTopicSession(
117 false, Session.CLIENT_ACKNOWLEDGE);
118 if (subscriptionName == null) {
119
120 _subscriber = _session.createSubscriber(topic, selector, false);
121 } else {
122
123 _subscriber = _session.createDurableSubscriber(
124 topic, subscriptionName, selector, false);
125 }
126
127 _subscriber.setMessageListener(this);
128 }
129
130 /***
131 * Close the connection consumer, freeing any allocated resources
132 *
133 * @throws JMSException if the consumer cannot be closed
134 */
135 public void close() throws JMSException {
136 super.close();
137 try {
138 _subscriber.close();
139 _session.close();
140 } finally {
141 _subscriber = null;
142 _session = null;
143 }
144 }
145 }