/*
* Copyright (C) 2012 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.facebook.zookeeper.election;
public interface LeaderElectionCallback {
/**
* Callback signaling that the current host has won the election.
*/
public void elected();
/**
* Callback signaling that the current host was unexpectedly removed from
* the election or from leadership (e.g. session expiration).
* Note: Calls to withdraw and cycle will NOT generate removed signals.
*/
public void removed();
/**
* Callback signaling an asynchronous error.
* @param exception
*/
public void error(Exception exception);
}