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.metrics;
  
  /**
   * A metric which calculates the distribution of a value.
   * 直方分布指标，例如，可以用于统计某个接口的响应时间，可以展示50%, 70%, 90%的请求响应时间落在哪个区间内
   *
   * @see <a href="http://www.johndcook.com/standard_deviation.html">Accurately computing running
   *      variance</a>
   */
  public interface Histogram extends Metric, Sampling, Counting {
  
      /**
       * Adds a recorded value.
       * 将某个整型值添加到
       *
       * @param value the length of the value
       */
      void update(int value);
  
      /**
       * Adds a recorded value.
       *
       * @param value the length of the value
       */
      void update(long value);
  
  }
  