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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.hadoop.hbase.master;


import org.apache.yetus.audience.InterfaceAudience;
import org.apache.hadoop.hbase.ServerName;

/**
 * Get notification of server registration events. The invocations are inline
 * so make sure your implementation is fast or else you'll slow hbase.
 */
@InterfaceAudience.Private
public interface ServerListener {
  /**
   * Started waiting on RegionServers to check-in.
   */
  default void waiting() {};

  /**
   * The server has joined the cluster.
   * @param serverName The remote servers name.
   */
  default void serverAdded(final ServerName serverName) {};

  /**
   * The server was removed from the cluster.
   * @param serverName The remote servers name.
   */
  default void serverRemoved(final ServerName serverName) {};
}