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 }