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1   /**
2    * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
3    * agreements. See the NOTICE file distributed with this work for additional information regarding
4    * copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the
5    * "License"); you may not use this file except in compliance with the License. You may obtain a
6    * copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable
7    * law or agreed to in writing, software distributed under the License is distributed on an "AS IS"
8    * BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License
9    * for the specific language governing permissions and limitations under the License.
10   */
11  package org.apache.hadoop.hbase.quotas;
12  
13  import java.io.IOException;
14  
15  import org.apache.hadoop.hbase.HRegionInfo;
16  import org.apache.hadoop.hbase.classification.InterfaceAudience;
17  
18  /**
19   * The listener interface for receiving region state events.
20   */
21  @InterfaceAudience.Private
22  public interface RegionStateListener {
23  
24    /**
25     * Process region split event.
26     * @param hri An instance of HRegionInfo
27     * @throws IOException
28     */
29    void onRegionSplit(HRegionInfo hri) throws IOException;
30  
31    /**
32     * Process region split reverted event.
33     * @param hri An instance of HRegionInfo
34     * @throws IOException Signals that an I/O exception has occurred.
35     */
36    void onRegionSplitReverted(HRegionInfo hri) throws IOException;
37  
38    /**
39     * Process region merge event.
40     * @param hri An instance of HRegionInfo
41     * @throws IOException
42     */
43    void onRegionMerged(HRegionInfo hri) throws IOException;
44  }