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.HRegionInfo;
23 import org.apache.hadoop.hbase.ServerName;
24
25 /**
26 * Get notification of assignment 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 AssignmentListener {
31 /**
32 * The region was opened on the specified server.
33 * @param regionInfo The opened region.
34 * @param serverName The remote servers name.
35 */
36 void regionOpened(final HRegionInfo regionInfo, final ServerName serverName);
37
38 /**
39 * The region was closed on the region server.
40 * @param regionInfo The closed region.
41 */
42 void regionClosed(final HRegionInfo regionInfo);
43 }