/**
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
    * with the License.  You may obtain a copy of the License at
    *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.hadoop.hbase.metrics.impl;
  
  import java.util.concurrent.TimeUnit;
  
  import org.apache.hadoop.hbase.classification.InterfaceAudience;
  import org.apache.hadoop.hbase.metrics.Timer;
  
  /**
   * Custom implementation of {@link Timer}.
   */
  @InterfaceAudience.Private
  public class TimerImpl implements Timer {
    private final HistogramImpl histogram;
    private final DropwizardMeter meter;
  
    // track time events in micros
    private static final TimeUnit DEFAULT_UNIT = TimeUnit.MICROSECONDS;
  
    public TimerImpl() {
      this.histogram = new HistogramImpl();
      this.meter = new DropwizardMeter();
    }
  
    @Override
    public void update(long duration, TimeUnit unit) {
      if (duration >= 0) {
        histogram.update(DEFAULT_UNIT.convert(duration, unit));
        meter.mark();
      }
    }
  
    @Override
    public HistogramImpl getHistogram() {
      return histogram;
    }
  
    @Override
    public DropwizardMeter getMeter() {
      return meter;
    }
  
    @Override
    public void updateMillis(long durationMillis) {
      update(durationMillis, TimeUnit.NANOSECONDS);
    }
  
    @Override
    public void updateMicros(long durationMicros) {
      update(durationMicros, TimeUnit.MICROSECONDS);
    }
  
    @Override
    public void updateNanos(long durationNanos) {
      update(durationNanos, TimeUnit.NANOSECONDS);
  
    }
  }