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Java > Open Source Codes > org > mr > api > simple > Publisher


1 /*
2  * Copyright 2002 by
3  * <a HREF="http://www.coridan.com">Coridan</a>
4  * <a HREF="mailto: support@coridan.com ">support@coridan.com</a>
5  *
6  * The contents of this file are subject to the Mozilla Public License Version
7  * 1.1 (the "License"); you may not use this file except in compliance with the
8  * License. You may obtain a copy of the License at
9  * http://www.mozilla.org/MPL/
10  *
11  * Software distributed under the License is distributed on an "AS IS" basis,
12  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
13  * for the specific language governing rights and limitations under the
14  * License.
15  *
16  * The Original Code is "MantaRay" (TM).
17  *
18  * The Initial Developer of the Original Code is Uri Schneider.
19  * Portions created by the Initial Developer are Copyright (C) 2006
20  * Coridan Inc. All Rights Reserved.
21  *
22  * Contributor(s): all the names of the contributors are added in the source
23  * code where applicable.
24  *
25  * Alternatively, the contents of this file may be used under the terms of the
26  * LGPL license (the "GNU LESSER GENERAL PUBLIC LICENSE"), in which case the
27  * provisions of LGPL are applicable instead of those above. If you wish to
28  * allow use of your version of this file only under the terms of the LGPL
29  * License and not to allow others to use your version of this file under
30  * the MPL, indicate your decision by deleting the provisions above and
31  * replace them with the notice and other provisions required by the LGPL.
32  * If you do not delete the provisions above, a recipient may use your version
33  * of this file under either the MPL or the GNU LESSER GENERAL PUBLIC LICENSE.
34  
35  *
36  * This library is free software; you can redistribute it and/or modify it
37  * under the terms of the MPL as stated above or under the terms of the GNU
38  * Lesser General Public License as published by the Free Software Foundation;
39  * either version 2.1 of the License, or any later version.
40  *
41  * This library is distributed in the hope that it will be useful, but WITHOUT
42  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
43  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
44  * License for more details.
45  */
46 package org.mr.api.simple;
47
48 import org.mr.api.jms.MantaTopicConnectionFactory;
49
50 /**
51  * Publisher.java
52  *
53  * An object used to send messages to a specific topic. Use the
54  * <code>SimpleAPI</code> factory to create one of these, and then simply use
55  * the {@link #send send} method to send messages.<p>
56  * <b>Concurrency</b><p>
57  * This object is not safe for use by multiple concurrent threads. Lock it if
58  * want concurrency.
59  *
60  * Created: Thu Jun 24 19:06:29 2004
61  *
62  * @author Uri Schneider
63  * @version 1.0
64  */
65 public class Publisher {
66     private String JavaDoc topicName;
67
68     private javax.jms.Session JavaDoc session;
69     private javax.jms.MessageProducer JavaDoc producer;
70
71     Publisher(String JavaDoc topicName) throws SimpleException {
72         this.topicName = topicName;
73
74         javax.jms.TopicConnectionFactory JavaDoc factory;
75         javax.jms.TopicConnection JavaDoc connection;
76         javax.jms.Topic JavaDoc topic;
77
78         try {
79             factory = new MantaTopicConnectionFactory();
80             connection = factory.createTopicConnection();
81             this.session = connection.createTopicSession(false,
82                                                          javax.jms.Session.
83                                                          AUTO_ACKNOWLEDGE);
84             topic = session.createTopic(topicName);
85             this.producer = session.createProducer(topic);
86             connection.start();
87         } catch (javax.jms.JMSException JavaDoc e) {
88             throw new SimpleException(e);
89         }
90     } // Publisher constructor
91
92     /**
93      * Send a message to this publisher's topic.
94      *
95      * @param message The message to be sent.
96      * @throws SimpleException If this publisher was closed, or if a timeout
97      * occured.
98      */
99     public void send(Message message) throws SimpleException {
100         if (this.producer == null) {
101             throw new SimpleException(SimpleException.ERROR_CLOSED_ACTOR,
102                                       "Publisher for " + this.topicName +
103                                       " is closed. No further messages " +
104                                       "can be sent.");
105         }
106
107         try {
108             javax.jms.BytesMessage JavaDoc jmsMessage =
109                 message.toBytesMessage(this.session);
110             this.producer.send(jmsMessage);
111         } catch (javax.jms.JMSException JavaDoc e) {
112             throw new SimpleException(e);
113         }
114
115     }
116
117     /**
118      * Close this publisher. All resources associated with this publisher are
119      * released, and no further operations are allowed.
120      * @throws SimpleException if this publisher was already closed.
121      */
122     public void close() throws SimpleException {
123         if (this.producer == null) {
124             throw new SimpleException(SimpleException.ERROR_CLOSED_ACTOR,
125                                       "Publisher for " + this.topicName +
126                                       " is already closed.");
127         }
128
129         try {
130             this.producer.close();
131             this.producer = null;
132         } catch (javax.jms.JMSException JavaDoc e) {
133             throw new SimpleException(e);
134         }
135     }
136 } // Publisher
137
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