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 21 package org.apache.hadoop.hbase.regionserver; 22 23 /** 24 * Implementors of this interface want to be notified when an HRegion 25 * determines that a cache flush is needed. A FlushRequester (or null) 26 * must be passed to the HRegion constructor so it knows who to call when it 27 * has a filled memstore. 28 */ 29 public interface FlushRequester { 30 /** 31 * Tell the listener the cache needs to be flushed. 32 * 33 * @param region the HRegion requesting the cache flush 34 */ 35 void request(HRegion region); 36 }