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 }