001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018package org.apache.hadoop.hbase.regionserver; 019 020import java.util.Collection; 021import org.apache.hadoop.conf.Configured; 022import org.apache.yetus.audience.InterfaceAudience; 023 024/** 025 * A flush policy determines the stores that need to be flushed when flushing a region. 026 */ 027@InterfaceAudience.Private 028public abstract class FlushPolicy extends Configured { 029 030 /** 031 * The region configured for this flush policy. 032 */ 033 protected HRegion region; 034 035 /** 036 * Upon construction, this method will be called with the region to be governed. It will be called 037 * once and only once. 038 */ 039 protected void configureForRegion(HRegion region) { 040 this.region = region; 041 } 042 043 /** Returns the stores need to be flushed. */ 044 public abstract Collection<HStore> selectStoresToFlush(); 045}