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Java > Open Source Codes > DurableSubscriber


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41  * Copyright 2004 (C) Exoffice Technologies Inc. All Rights Reserved.
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43  * $Id: DurableSubscriber.java,v 1.2 2005/04/08 13:42:48 tanderson Exp $
44  */
45
46 import javax.naming.Context JavaDoc;
47 import javax.naming.InitialContext JavaDoc;
48 import javax.naming.NamingException JavaDoc;
49 import javax.jms.ConnectionFactory JavaDoc;
50 import javax.jms.Connection JavaDoc;
51 import javax.jms.Topic JavaDoc;
52 import javax.jms.TopicSubscriber JavaDoc;
53 import javax.jms.Session JavaDoc;
54 import javax.jms.Message JavaDoc;
55 import javax.jms.TextMessage JavaDoc;
56 import javax.jms.JMSException JavaDoc;
57
58
59 /**
60  * Durable <code>TopicSubscriber</code> example.
61  *
62  * @author <a HREF="mailto:tma@netspace.net.au">Tim Anderson</a>
63  * @version $Revision: 1.2 $ $Date: 2005/04/08 13:42:48 $
64  */
65 public class DurableSubscriber {
66
67     /**
68      * Main line.
69      *
70      * @param args command line arguments
71      */
72     public static void main(String JavaDoc[] args) {
73         Context JavaDoc context = null;
74         ConnectionFactory JavaDoc factory = null;
75         Connection JavaDoc connection = null;
76         String JavaDoc factoryName = "ConnectionFactory";
77         String JavaDoc topicName = null;
78         Topic JavaDoc topic = null;
79         int count = 1;
80         Session JavaDoc session = null;
81         TopicSubscriber JavaDoc subscriber = null;
82         String JavaDoc subscriptionName = "rubADubSub";
83
84         if (args.length < 1 || args.length > 2) {
85             System.out.println("usage: DurableSubscriber <topic> [count]");
86             System.exit(1);
87         }
88
89         topicName = args[0];
90         if (args.length == 2) {
91             count = Integer.parseInt(args[1]);
92         }
93
94         // Create the JNDI initial context.
95 try {
96             context = new InitialContext JavaDoc();
97         } catch (NamingException JavaDoc exception) {
98             System.err.println("Failed to create initial JNDI context: "
99                                + exception);
100             System.exit(1);
101         }
102
103         // Look up the ConnectionFactory
104 try {
105             factory = (ConnectionFactory JavaDoc) context.lookup(factoryName);
106         } catch (NamingException JavaDoc exception) {
107             System.err.println("Failed to look up connection factory: "
108                                + exception);
109             System.exit(1);
110         }
111
112         // Look up the topic
113 try {
114             topic = (Topic JavaDoc) context.lookup(topicName);
115         } catch (NamingException JavaDoc exception) {
116             System.err.println("Failed to look up topic: " + exception);
117             System.exit(1);
118         }
119
120         try {
121             // create the connection
122 connection = factory.createConnection();
123
124             // create the session
125 session = connection.createSession(
126                 false, Session.AUTO_ACKNOWLEDGE);
127
128             // create the durable subscriber
129 subscriber = session.createDurableSubscriber(
130                 topic, subscriptionName);
131
132             // start the connection, to enable message receipt
133 connection.start();
134
135             for (int i = 0; i < count; ++i) {
136                 Message JavaDoc message = subscriber.receive();
137                 if (message instanceof TextMessage JavaDoc) {
138                     TextMessage JavaDoc text = (TextMessage JavaDoc) message;
139                     System.out.println("Received: " + text.getText());
140                 } else if (message != null) {
141                     System.out.println("Received non text message");
142                 }
143             }
144
145         } catch (JMSException JavaDoc exception) {
146             System.err.println("JMS exception: " + exception);
147             System.exit(1);
148         } finally {
149             if (connection != null) {
150                 try {
151                     connection.close();
152                 } catch (JMSException JavaDoc exception) {
153                     System.err.println("Failed to close connection: "
154                                        + exception);
155                 }
156             }
157         }
158         System.exit(0);
159     }
160
161 }
162
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