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 registration events. The invocations are inline
26 * so make sure your implementation is fast or else you'll slow hbase.
27 */
28 @InterfaceAudience.Private
29 public interface ServerListener {
30 /**
31 * Started waiting on RegionServers to check-in.
32 */
33 void waiting();
34
35 /**
36 * The server has joined the cluster.
37 * @param serverName The remote servers name.
38 */
39 void serverAdded(final ServerName serverName);
40
41 /**
42 * The server was removed from the cluster.
43 * @param serverName The remote servers name.
44 */
45 void serverRemoved(final ServerName serverName);
46 }