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 }