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 21 import org.apache.hadoop.hbase.classification.InterfaceAudience; 22 import org.apache.hadoop.hbase.ServerName; 23 24 /** 25 * Get notification of server events. The invocations are inline 26 * so make sure your implementation is fast else you'll slow hbase. 27 */ 28 @InterfaceAudience.Private 29 public interface ServerListener { 30 /** 31 * The server has joined the cluster. 32 * @param serverName The remote servers name. 33 */ 34 void serverAdded(final ServerName serverName); 35 36 /** 37 * The server was removed from the cluster. 38 * @param serverName The remote servers name. 39 */ 40 void serverRemoved(final ServerName serverName); 41 }