LeaderElectionObserver.java

/*
 * 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;

import org.apache.zookeeper.KeeperException;

public interface LeaderElectionObserver {
  /**
   * Gets the name of the candidate that is currently the leader
   * @return Name of the leader, or null if there are no candidates
   * @throws InterruptedException
   * @throws org.apache.zookeeper.KeeperException
   */
  String getLeader() throws InterruptedException, KeeperException;
}