1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 package org.apache.hadoop.hbase.master; 19 20 import java.io.IOException; 21 22 import org.apache.hadoop.classification.InterfaceAudience; 23 import org.apache.hadoop.hbase.ServerName; 24 25 /** 26 * Get notification of server events. The invocations are inline 27 * so make sure your implementation is fast else you'll slow hbase. 28 */ 29 @InterfaceAudience.Private 30 public interface ServerListener { 31 /** 32 * The server has joined the cluster. 33 * @param serverName The remote servers name. 34 */ 35 void serverAdded(final ServerName serverName); 36 37 /** 38 * The server was removed from the cluster. 39 * @param serverName The remote servers name. 40 */ 41 void serverRemoved(final ServerName serverName); 42 }