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1   /*** 
2    * 
3    * Copyright 2004 Protique Ltd
4    * 
5    * Licensed under the Apache License, Version 2.0 (the "License"); 
6    * you may not use this file except in compliance with the License. 
7    * You may obtain a copy of the License at 
8    * 
9    * http://www.apache.org/licenses/LICENSE-2.0
10   * 
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS, 
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
14   * See the License for the specific language governing permissions and 
15   * limitations under the License. 
16   * 
17   **/
18  package org.codehaus.activecluster.impl;
19  
20  import org.apache.commons.logging.Log;
21  import org.apache.commons.logging.LogFactory;
22  import org.codehaus.activecluster.Node;
23  
24  import javax.jms.JMSException;
25  import javax.jms.Message;
26  import javax.jms.MessageProducer;
27  import javax.jms.Session;
28  
29  
30  /***
31   * A local stub for the state service which sends JMS messages
32   * to the cluster
33   *
34   * @version $Revision: 1.5 $
35   */
36  public class StateServiceStub implements StateService {
37  
38      private final Log log = LogFactory.getLog(getClass());
39  
40      private Session session;
41      private MessageProducer producer;
42  
43      public StateServiceStub(Session session, MessageProducer producer) {
44          this.session = session;
45          this.producer = producer;
46      }
47  
48      public void keepAlive(Node node) {
49          try {
50              if (log.isDebugEnabled()) {
51                  log.debug("Sending cluster data message: " + node);
52              }
53  
54              Message message = session.createObjectMessage(new NodeImpl(node));
55              producer.send(message);
56          }
57          catch (JMSException e) {
58              log.error("Could not send JMS message: " + e, e);
59          }
60      }
61  
62      public void shutdown(Node node) {
63          try {
64              if (log.isDebugEnabled()) {
65                  log.debug("Sending shutdown message: " + node);
66              }
67  
68              Message message = session.createObjectMessage(new NodeImpl(node));
69              message.setJMSType("shutdown");
70              producer.send(message);
71          }
72          catch (JMSException e) {
73              log.error("Could not send JMS message: " + e, e);
74          }
75      }
76  }