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 meter metric which measures mean throughput and one-, five-, and fifteen-minute
   * exponentially-weighted moving average throughput.
   * 一种用于度量一段时间内吞吐率的计量器。例如，一分钟内，五分钟内，十五分钟内的qps指标，
   * 这段时间内的吞吐率通过指数加权的方式计算移动平均得出。
   */
  public interface Meter extends Metered {
  
      /**
       * Mark the occurrence of an event.
       * 标记一次事件
       */
      void mark();
  
      /**
       * Mark the occurrence of a given number of events.
       * 标记n次事件
       *
       * @param n the number of events
       */
      void mark(long n);
  }
  