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