Clover coverage report - Coverage timestamp: Sa Jul 7 2007 09:11:40 CEST FRAMES NO FRAMES |
file stats: | LOC: | 180 |  | Methods: | 4
| NCLOC: | 86 |  | Classes: | 1
Source file | Conditionals | Statements | Methods | TOTAL
JMS10BroadcastingListener.java | 0% | 0% | 0% | 0% |

1 |  | /*
2 |  | * Copyright (c) 2002-2003 by OpenSymphony
3 |  | * All rights reserved.
4 |  | */
5 |  | package com.opensymphony.oscache.plugins.clustersupport;
6 |  |
7 |  | import com.opensymphony.oscache.base.Cache;
8 |  | import com.opensymphony.oscache.base.Config;
9 |  | import com.opensymphony.oscache.base.FinalizationException;
10 |  | import com.opensymphony.oscache.base.InitializationException;
11 |  |
12 |  | import org.apache.commons.logging.Log;
13 |  | import org.apache.commons.logging.LogFactory;
14 |  |
15 |  | import javax.jms.*;
16 |  |
17 |  | import javax.naming.InitialContext;
18 |  |
19 |  | /**
20 |  | * A JMS 1.0.x based clustering implementation. This implementation is independent of
21 |  | * the JMS provider and uses non-persistent messages on a publish subscribe protocol.
22 |  | *
23 |  | * @author <a href="&#109;a&#105;&#108;&#116;&#111;:chris&#64;swebtec.&#99;&#111;&#109;">Chris Miller</a>
24 |  | */
25 |  | public class JMS10BroadcastingListener extends AbstractBroadcastingListener {
26 |  | private final static Log log = LogFactory.getLog(JMS10BroadcastingListener.class);
27 |  |
28 |  | /**
29 |  | * The name of this cluster. Used to identify the sender of a message.
30 |  | */
31 |  | private String clusterNode;
32 |  |
33 |  | /**
34 |  | *The JMS connection used
35 |  | */
36 |  | private TopicConnection connection;
37 |  |
38 |  | /**
39 |  | * Th object used to publish new messages
40 |  | */
41 |  | private TopicPublisher publisher;
42 |  |
43 |  | /**
44 |  | * The current JMS session
45 |  | */
46 |  | private TopicSession publisherSession;
47 |  |
48 |  | /**
49 |  | * <p>Called by the cache administrator class when a cache is instantiated.</p>
50 |  | * <p>The JMS broadcasting implementation requires the following configuration
51 |  | * properties to be specified in <code>oscache.properties</code>:
52 |  | * <ul>
53 |  | * <li><b>cache.cluster.jms.topic.factory</b> - The JMS connection factory to use</li>
54 |  | * <li><b>cache.cluster.jms.topic.name</b> - The JMS topic name</li>
55 |  | * <li><b>cache.cluster.jms.node.name</b> - The name of this node in the cluster. This should
56 |  | * be unique for each node.</li>
57 |  | * Please refer to the clustering documentation for further details on configuring
58 |  | * the JMS clustered caching.</p>
59 |  | *
60 |  | * @param cache the cache instance that this listener is attached to.
61 |  | *
62 |  | * @throws InitializationException thrown when there was a
63 |  | * problem initializing the listener. The cache administrator will log this error and
64 |  | * disable the listener.
65 |  | */
66 | 0 | public void initialize(Cache cache, Config config) throws InitializationException {
67 | 0 | super.initialize(cache, config);
68 |  |
69 |  | // Get the name of this node
70 | 0 | clusterNode = config.getProperty("cache.cluster.jms.node.name");
71 |  |
72 | 0 | String topic = config.getProperty("cache.cluster.jms.topic.name");
73 | 0 | String topicFactory = config.getProperty("cache.cluster.jms.topic.factory");
74 |  |
75 | 0 | if (log.isInfoEnabled()) {
76 | 0 | log.info("Starting JMS clustering (node name=" + clusterNode + ", topic=" + topic + ", topic factory=" + topicFactory + ")");
77 |  | }
78 |  |
79 | 0 | try {
80 |  | // Make sure you have specified the necessary JNDI properties (usually in
81 |  | // a jndi.properties resource file, or as system properties)
82 | 0 | InitialContext jndi = new InitialContext();
83 |  |
84 |  | // Look up a JMS connection factory
85 | 0 | TopicConnectionFactory connectionFactory = (TopicConnectionFactory) jndi.lookup(topicFactory);
86 |  |
87 |  | // Create a JMS connection
88 | 0 | connection = connectionFactory.createTopicConnection();
89 |  |
90 |  | // Create session objects
91 | 0 | publisherSession = connection.createTopicSession(false, Session.AUTO_ACKNOWLEDGE);
92 |  |
93 | 0 | TopicSession subSession = connection.createTopicSession(false, Session.AUTO_ACKNOWLEDGE);
94 |  |
95 |  | // Look up the JMS topic
96 | 0 | Topic chatTopic = (Topic) jndi.lookup(topic);
97 |  |
98 |  | // Create the publisher and subscriber
99 | 0 | publisher = publisherSession.createPublisher(chatTopic);
100 |  |
101 | 0 | TopicSubscriber subscriber = subSession.createSubscriber(chatTopic);
102 |  |
103 |  | // Set the message listener
104 | 0 | subscriber.setMessageListener(new MessageListener() {
105 | 0 | public void onMessage(Message message) {
106 | 0 | try {
107 |  | //check the message type
108 | 0 | ObjectMessage objectMessage = null;
109 |  |
110 | 0 | if (!(message instanceof ObjectMessage)) {
111 | 0 | log.error("Cannot handle message of type (class=" + message.getClass().getName() + "). Notification ignored.");
112 | 0 | return;
113 |  | }
114 |  |
115 | 0 | objectMessage = (ObjectMessage) message;
116 |  |
117 |  | //check the message content
118 | 0 | if (!(objectMessage.getObject() instanceof ClusterNotification)) {
119 | 0 | log.error("An unknown cluster notification message received (class=" + objectMessage.getObject().getClass().getName() + "). Notification ignored.");
120 | 0 | return;
121 |  | }
122 |  |
123 | 0 | if (log.isDebugEnabled()) {
124 | 0 | log.debug(objectMessage.getObject());
125 |  | }
126 |  |
127 |  | // This prevents the notification sent by this node from being handled by itself
128 | 0 | if (!objectMessage.getStringProperty("nodeName").equals(clusterNode)) {
129 |  | //now handle the message
130 | 0 | ClusterNotification notification = (ClusterNotification) objectMessage.getObject();
131 | 0 | handleClusterNotification(notification);
132 |  | }
133 |  | } catch (JMSException jmsEx) {
134 | 0 | log.error("Cannot handle cluster Notification", jmsEx);
135 |  | }
136 |  | }
137 |  | });
138 |  |
139 |  | // Start the JMS connection; allows messages to be delivered
140 | 0 | connection.start();
141 |  | } catch (Exception e) {
142 | 0 | throw new InitializationException("Initialization of the JMS10BroadcastingListener failed: " + e);
143 |  | }
144 |  | }
145 |  |
146 |  | /**
147 |  | * Called by the cache administrator class when a cache is destroyed.
148 |  | *
149 |  | * @throws FinalizationException thrown when there was a problem finalizing the
150 |  | * listener. The cache administrator will catch and log this error.
151 |  | */
152 | 0 | public void finialize() throws FinalizationException {
153 | 0 | try {
154 | 0 | if (log.isInfoEnabled()) {
155 | 0 | log.info("Shutting down JMS clustering...");
156 |  | }
157 |  |
158 | 0 | connection.close();
159 |  |
160 | 0 | if (log.isInfoEnabled()) {
161 | 0 | log.info("JMS clustering shutdown complete.");
162 |  | }
163 |  | } catch (JMSException e) {
164 | 0 | log.warn("A problem was encountered when closing the JMS connection", e);
165 |  | }
166 |  | }
167 |  |
168 | 0 | protected void sendNotification(ClusterNotification message) {
169 | 0 | try {
170 | 0 | ObjectMessage objectMessage = publisherSession.createObjectMessage();
171 | 0 | objectMessage.setObject(message);
172 |  |
173 |  | //sign the message, with the name of this node
174 | 0 | objectMessage.setStringProperty("nodeName", clusterNode);
175 | 0 | publisher.publish(objectMessage);
176 |  | } catch (JMSException e) {
177 | 0 | log.error("Cannot send notification " + message, e);
178 |  | }
179 |  | }
180 |  | }