CompositeStateListener


1   /*
2    * This software is released under a licence similar to the Apache Software Licence.
3    * See org.logicalcobwebs.proxool.package.html for details.
4    * The latest version is available at http://proxool.sourceforge.net
5    */
6   package org.logicalcobwebs.proxool;
7   
8   import org.apache.commons.logging.Log;
9   import org.apache.commons.logging.LogFactory;
10  import org.logicalcobwebs.proxool.util.AbstractListenerContainer;
11  
12  /**
13   * A {@link StateListenerIF} that keeps a list of <code>StateListenerIF</code>s
14   * and notifies them in a thread safe manner.
15   * It also implements {@link org.logicalcobwebs.proxool.util.ListenerContainerIF ListenerContainerIF}
16   * which provides methods for
17   * {@link org.logicalcobwebs.proxool.util.ListenerContainerIF#addListener(Object) adding} and
18   * {@link org.logicalcobwebs.proxool.util.ListenerContainerIF#removeListener(Object) removing} listeners.
19   * 
20   * @version $Revision: 1.6 $, $Date: 2006/01/18 14:40:01 $
21   * @author Christian Nedregaard (christian_nedregaard@email.com)
22   * @author $Author: billhorsman $ (current maintainer)
23   * @since Proxool 0.7
24   */
25  public class CompositeStateListener extends AbstractListenerContainer implements StateListenerIF {
26      static final Log LOG = LogFactory.getLog(CompositeStateListener.class);
27  
28      /**
29       * @see StateListenerIF#upStateChanged(int)
30       */
31      public void upStateChanged(int upState) 
32      {
33          Object  [] listeners = getListeners();
34          
35          for(int i=0; i<listeners.length; i++) {
36              try {
37                  StateListenerIF stateListener = (StateListenerIF) listeners[i];
38                  stateListener.upStateChanged(upState);
39              }
40              catch (RuntimeException   re) {
41                  LOG.warn("RuntimeException received from listener "+listeners[i]+" when dispatching upStateChanged event", re);
42              }
43          }
44      }
45  }
46  
47  /*
48   Revision history:
49   $Log: CompositeStateListener.java,v $
50   Revision 1.6  2006/01/18 14:40:01  billhorsman
51   Unbundled Jakarta's Commons Logging.
52  
53   Revision 1.5  2004/03/16 08:48:32  brenuart
54   Changes in the AbstractListenerContainer:
55   - provide more efficient concurrent handling;
56   - better handling of RuntimeException thrown by external listeners.
57  
58   Revision 1.4  2003/03/10 15:26:44  billhorsman
59   refactoringn of concurrency stuff (and some import
60   optimisation)
61  
62   Revision 1.3  2003/03/03 11:11:56  billhorsman
63   fixed licence
64  
65   Revision 1.2  2003/02/07 17:20:15  billhorsman
66   checkstyle
67  
68   Revision 1.1  2003/02/07 01:47:17  chr32
69   Initial revition.
70  
71  */
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