ClientIconHelper


1   package org.oddjob.jmx.client;
2   
3   import java.rmi.RemoteException  ;
4   import java.util.ArrayList  ;
5   import java.util.Iterator  ;
6   import java.util.List  ;
7   
8   import org.oddjob.images.IconEvent;
9   import org.oddjob.images.IconHelper;
10  import org.oddjob.images.IconListener;
11  
12  /**
13   * Implement a remote state listener. This handles remote state events and also
14   * propogates them on the client side as normal state events.
15   * 
16   * @author Rob Gordon
17   */
18  
19  class ClientIconHelper {
20  
21      /** Remember the last event so new state listeners can be told it. */
22      private IconEvent lastEvent = new IconEvent(this, IconHelper.NULL);
23  
24      /** listeners */
25      private final List   listeners = new ArrayList  ();
26  
27      /** The owner, to be used as the source of the event. */
28      private final Object   owner;
29  
30      /**
31       * Constructor.
32       * 
33       * @param owner The owning (source) object.
34       * 
35       * @throws RemoteException From underlying RMI.
36       */
37      public ClientIconHelper(Object   owner) {     
38          super();
39          this.owner = owner;
40      }
41  
42      public void iconEvent(IconEvent event) {
43          // The event that comes over the wire has a null source, so create a new one
44          // job node client as the source.
45          IconEvent iconEvent = new IconEvent(owner, event.getIconId());
46  
47          lastEvent = event;
48          
49          synchronized (listeners) {
50              for (Iterator   it = listeners.iterator(); it.hasNext();) {
51                  ((IconListener)it.next()).iconEvent(iconEvent); 
52              }
53          }
54      }
55      
56      public void addIconListener(IconListener listener) {
57          IconEvent nowEvent = null;
58          nowEvent = lastEvent;
59          synchronized (listeners) {
60              listener.iconEvent(nowEvent);
61              listeners.add(listener);
62          }
63      }
64  
65      /**
66       * Remove a job state listener.
67       * 
68       * @param listener The job state listener.
69       */ 
70      public void removeIconListener(IconListener listener) {
71          synchronized (listeners) {
72              listeners.remove(listener);
73          }
74      }
75  
76  }
77
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