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1   /**
2    * Copyright 2010 The Apache Software Foundation
3    *
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *     http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing, software
15   * distributed under the License is distributed on an "AS IS" BASIS,
16   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17   * See the License for the specific language governing permissions and
18   * limitations under the License.
19   */
20  package org.apache.hadoop.hbase.regionserver;
21  
22  import org.apache.hadoop.hbase.HRegionInfo;
23  
24  /**
25   * Add and remove online regions.
26   */
27  interface OnlineRegions {
28    /**
29     * Add to online regions.
30     * @param r
31     */
32    void addToOnlineRegions(final HRegion r);
33  
34    /**
35     * This method removes HRegion corresponding to hri from the Map of onlineRegions.
36     *
37     * @param hri the HRegionInfo corresponding to the HRegion to-be-removed.
38     * @return the removed HRegion, or null if the HRegion was not in onlineRegions.
39     */
40    HRegion removeFromOnlineRegions(HRegionInfo hri);
41  }