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.DefaultConvertor;
  import com.alibaba.jstorm.common.metric.old.operator.merger.SumMerger;
  import com.alibaba.jstorm.common.metric.old.operator.updater.AddUpdater;
  import com.alibaba.jstorm.common.metric.old.window.Metric;
  
  /**
   * The class is similar to com.codahale.metrics.Counter
   * 
   * Sum all window's value
   * 
   * how to use Counter , please refer to Sampling Interface
   * 
   * @author zhongyan.feng
   * 
   * @param <T>
   */
  public class Counter<T extends Number> extends Metric<T, T> {
      private static final long serialVersionUID = -1362345159511508074L;
  
      public Counter(T zero) {
          updater = new AddUpdater<T>();
          merger = new SumMerger<T>();
          convertor = new DefaultConvertor<T>();
          defaultValue = zero;
  
          init();
      }
  
      public static void main(String[] args) {
  
      }
  }
  