content: /**
   * 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 com.alibaba.jstorm.common.metric.old;
  
  import com.alibaba.jstorm.common.metric.old.operator.convert.Convertor;
  import com.alibaba.jstorm.common.metric.old.operator.merger.AvgMerger;
  import com.alibaba.jstorm.common.metric.old.operator.updater.AvgUpdater;
  import com.alibaba.jstorm.common.metric.old.window.Metric;
  
  /**
   * Meter is used to compute tps
   * 
   * Attention: 1.
   * 
   * @author zhongyan.feng
   * 
   */
  public class Histogram extends Metric<Double, Histogram.HistorgramPair> {
      private static final long serialVersionUID = -1362345159511508074L;
  
      public Histogram() {
          defaultValue = new HistorgramPair();
          updater = new AvgUpdater();
          merger = new AvgMerger();
          convertor = new HistogramConvertor();
  
          init();
      }
  
      public static class HistogramConvertor implements Convertor<HistorgramPair, Double> {
          private static final long serialVersionUID = -1569170826785657226L;
  
          @Override
          public Double convert(HistorgramPair from) {
              // TODO Auto-generated method stub
              if (from == null) {
                  return 0.0d;
              }
  
              if (from.getTimes() == 0) {
                  return 0.0d;
              } else {
                  return from.getSum() / from.getTimes();
              }
          }
  
      }
  
      public static class HistorgramPair {
          private double sum;
          private long times;
  
          public HistorgramPair() {
  
          }
  
          public HistorgramPair(double sum, long times) {
              this.sum = sum;
              this.times = times;
          }
  
          public double getSum() {
              return sum;
          }
  
          public void setSum(double sum) {
              this.sum = sum;
          }
  
          public void addValue(double value) {
              sum += value;
          }
  
          public long getTimes() {
              return times;
          }
  
          public void setTimes(long times) {
              this.times = times;
          }
  
          public void addTimes(long time) {
              times += time;
          }
      }
  
  }
  