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;
  
  /**
   * <pre>
   * An incrementing and decrementing counter metric.
   *
   * 计数器型指标，适用于记录调用总量等类型的数据
   * </pre>
   */
  public interface Counter extends Metric, Counting {
  
      /**
       * Increment the counter by one.
       * 计数器加1
       */
      void inc();
  
      /**
       * Increment the counter by {@code n}.
       * 计数器加n
       *
       * @param n the amount by which the counter will be increased
       */
      void inc(long n);
  
      /**
       * Decrement the counter by one.
       * 计数器减1
       */
      void dec();
  
      /**
       * Decrement the counter by {@code n}.
       * 计数器减n
       *
       * @param n the amount by which the counter will be decreased
       */
      void dec(long n);
  
  }
  