ClusterListener xref

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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  }