001/**
002 *
003 * Licensed to the Apache Software Foundation (ASF) under one
004 * or more contributor license agreements.  See the NOTICE file
005 * distributed with this work for additional information
006 * regarding copyright ownership.  The ASF licenses this file
007 * to you under the Apache License, Version 2.0 (the
008 * "License"); you may not use this file except in compliance
009 * with the License.  You may obtain a copy of the License at
010 *
011 *     http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS,
015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016 * See the License for the specific language governing permissions and
017 * limitations under the License.
018 */
019package org.apache.hadoop.hbase;
020
021import org.apache.yetus.audience.InterfaceAudience;
022
023/**
024 * Used to merge CacheEvictionStats. Thread safe for concurrent accessing.
025 */
026@InterfaceAudience.Private
027public class CacheEvictionStatsAggregator {
028
029  private final CacheEvictionStatsBuilder builder;
030
031  public CacheEvictionStatsAggregator() {
032    this.builder = new CacheEvictionStatsBuilder();
033  }
034
035  public synchronized void append(CacheEvictionStats stats) {
036    this.builder.append(stats);
037  }
038
039  public synchronized CacheEvictionStats sum() {
040    return this.builder.build();
041  }
042}