AlarmListenerBean


1   /**
2    * JOnAS: Java(TM) Open Application Server
3    * Copyright (C) 1999-2004 Bull S.A.
4    * Contact: jonas-team@objectweb.org
5    *
6    * This library is free software; you can redistribute it and/or
7    * modify it under the terms of the GNU Lesser General Public
8    * License as published by the Free Software Foundation; either
9    * version 2.1 of the License, or any later version.
10   *
11   * This library is distributed in the hope that it will be useful,
12   * but WITHOUT ANY WARRANTY; without even the implied warranty of
13   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14   * Lesser General Public License for more details.
15   *
16   * You should have received a copy of the GNU Lesser General Public
17   * License along with this library; if not, write to the Free Software
18   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
19   * USA
20   *
21   * Initial developer: JOnAS Team
22   * --------------------------------------------------------------------------
23   * $Id: AlarmListenerBean.java,v 1.6 2004/04/09 12:56:41 benoitf Exp $
24   * --------------------------------------------------------------------------
25   */
26  
27  package org.objectweb.alarm.beans;
28  
29  import javax.ejb.EJBException  ;
30  import javax.ejb.MessageDrivenBean  ;
31  import javax.ejb.MessageDrivenContext  ;
32  import javax.jms.JMSException  ;
33  import javax.jms.MapMessage  ;
34  import javax.jms.Message  ;
35  import javax.jms.MessageListener  ;
36  
37  /**
38   *
39   */
40  public class AlarmListenerBean implements MessageDrivenBean  , MessageListener   {
41  
42      /**
43       * Reference to the alarm manager
44       */
45      private static transient AlarmManager alarmManager = null;
46  
47      /**
48       * Default constructor
49       */
50      public AlarmListenerBean() {
51      }
52  
53      /**
54       * Set the associated context. The container call this method after the
55       * instance creation. The enterprise Bean instance should store the
56       * reference to the context object in an instance variable. This method is
57       * called with no transaction context.
58       * @param ctx A MessageDrivenContext interface for the
59       *        instance.
60       */
61  
62      public void setMessageDrivenContext(MessageDrivenContext   ctx) {
63      }
64  
65      /**
66       * A container invokes this method before it ends the life of the
67       * message-driven object. This happens when a container decides to terminate
68       * the message-driven object. This method is called with no transaction
69       * context.
70       * @throws EJBException Thrown by the method to indicate a failure caused by
71       *         a system-level error.
72       */
73      public void ejbRemove() throws EJBException   {
74      }
75  
76      /**
77       * The Message driven bean must define an ejbCreate methods with no args. We
78       * can do here all operations that will be common to all messages, i.e.
79       * asking JNDI for bean homes, ...
80       */
81      public void ejbCreate() {
82          // Get a reference on the AlarmManager.
83          alarmManager = AlarmManager.getInstance();
84  
85      }
86  
87      /**
88       * Called when there is a messgae
89       * @param message the message
90       * @see javax.jms.MessageListener#onMessage(javax.jms.Message)
91       */
92      public void onMessage(Message   message) {
93  
94          int sev = 0;
95          String   from = null;
96          String   reason = null;
97  
98          // Decode the message (MapMessage)
99          MapMessage   msg = (MapMessage  ) message;
100         try {
101             sev = msg.getInt("Severity");
102             from = msg.getString("From");
103             reason = msg.getString("Reason");
104         } catch (JMSException   e) {
105             Debug.logError("AlarmListenerBean exception:" + e);
106         }
107         // Give all messages to the AlarmServiceHelper.
108         alarmManager.alarm(sev, from, reason);
109 
110     }
111 }
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