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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  
19  package org.codehaus.activecluster;
20  
21  import java.util.EventListener;
22  
23  
24  /***
25   * Listener to events occuring on the cluster
26   *
27   * @version $Revision: 1.3 $
28   */
29  public interface ClusterListener extends EventListener {
30  
31      /***
32       * A new node has been added
33       *
34       * @param event
35       */
36      public void onNodeAdd(ClusterEvent event);
37  
38      /***
39       * A node has updated its state
40       *
41       * @param event
42       */
43      public void onNodeUpdate(ClusterEvent event);
44  
45      /***
46       * A node has been removed (a clean shutdown)
47       *
48       * @param event
49       */
50      public void onNodeRemoved(ClusterEvent event);
51  
52      /***
53       * A node has failed due to process or network failure
54       *
55       * @param event
56       */
57      public void onNodeFailed(ClusterEvent event);
58      
59      /***
60       * An election has occurred and a new coordinator has been selected
61       * @param event
62       */
63      public void onCoordinatorChanged(ClusterEvent event);
64  }