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.regionserver;
19
20 import java.util.Collection;
21
22 import org.apache.hadoop.conf.Configured;
23 import org.apache.hadoop.hbase.classification.InterfaceAudience;
24
25 /**
26 * A flush policy determines the stores that need to be flushed when flushing a region.
27 */
28 @InterfaceAudience.Private
29 public abstract class FlushPolicy extends Configured {
30
31 /**
32 * The region configured for this flush policy.
33 */
34 protected HRegion region;
35
36 /**
37 * Upon construction, this method will be called with the region to be governed. It will be called
38 * once and only once.
39 */
40 protected void configureForRegion(HRegion region) {
41 this.region = region;
42 }
43
44 /**
45 * @return the stores need to be flushed.
46 */
47 public abstract Collection<Store> selectStoresToFlush();
48
49 }