KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > org > jboss > ejb3 > timerservice > TimerServiceFactory


1 /*
2  * JBoss, Home of Professional Open Source
3  * Copyright 2005, JBoss Inc., and individual contributors as indicated
4  * by the @authors tag. See the copyright.txt in the distribution for a
5  * full listing of individual contributors.
6  *
7  * This is free software; you can redistribute it and/or modify it
8  * under the terms of the GNU Lesser General Public License as
9  * published by the Free Software Foundation; either version 2.1 of
10  * the License, or (at your option) any later version.
11  *
12  * This software is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with this software; if not, write to the Free
19  * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20  * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21  */
22 package org.jboss.ejb3.timerservice;
23
24 import javax.ejb.EJBException JavaDoc;
25 import javax.ejb.TimerService JavaDoc;
26 import javax.management.ObjectName JavaDoc;
27
28 /**
29  * Comment
30  *
31  * @author <a HREF="mailto:carlo.dewolf@jboss.com">Carlo de Wolf</a>
32  * @version $Revision: $
33  */
34 public abstract class TimerServiceFactory
35 {
36    private static TimerServiceFactory instance;
37    
38    private synchronized static TimerServiceFactory createInstance()
39    {
40       if(instance != null)
41          return instance;
42       
43       String JavaDoc factoryClass = "org.jboss.ejb3.timerservice.jboss.JBossTimerServiceFactory";
44       factoryClass = System.getProperty("org.jboss.ejb3.timerservice.factory", factoryClass);
45       
46       try
47       {
48          Class JavaDoc cls = Class.forName(factoryClass);
49          instance = (TimerServiceFactory) cls.newInstance();
50          
51          return instance;
52       }
53       catch(ClassNotFoundException JavaDoc e)
54       {
55          throw new EJBException JavaDoc(e);
56       }
57       catch(InstantiationException JavaDoc e)
58       {
59          throw new EJBException JavaDoc(e);
60       }
61       catch(IllegalAccessException JavaDoc e)
62       {
63          throw new EJBException JavaDoc(e);
64       }
65    }
66    
67    public abstract TimerService JavaDoc createTimerService(ObjectName JavaDoc objectName, TimedObjectInvoker invoker);
68    
69    public static TimerServiceFactory getInstance()
70    {
71       if(instance == null)
72       {
73          createInstance();
74       }
75       
76       return instance;
77    }
78    
79    public abstract void removeTimerService(TimerService JavaDoc timerService);
80    
81    /**
82     * Restores the timers held with the specified timer service.
83     *
84     * @param timerService
85     */
86    public abstract void restoreTimerService(TimerService JavaDoc timerService);
87 }
88
Popular Tags