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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.hbase.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  }