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.metrics.impl;
019
020import java.util.concurrent.atomic.LongAdder;
021
022import org.apache.hadoop.hbase.metrics.Counter;
023import org.apache.yetus.audience.InterfaceAudience;
024
025/**
026 * Custom implementation of {@link org.apache.hadoop.hbase.metrics.Counter} using LongAdder.
027 */
028@InterfaceAudience.Private
029public class CounterImpl implements Counter {
030
031  private final LongAdder counter;
032
033  public CounterImpl() {
034    this.counter = new LongAdder();
035  }
036
037  @Override
038  public void increment() {
039    this.counter.increment();
040  }
041
042  @Override
043  public void increment(long n) {
044    this.counter.add(n);
045  }
046
047  @Override
048  public void decrement() {
049    this.counter.decrement();
050  }
051
052  @Override
053  public void decrement(long n) {
054    this.counter.add(-n);
055  }
056
057  @Override
058  public long getCount() {
059    return this.counter.sum();
060  }
061}