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 org.apache.kafka.common.metrics.stats;
  
  import org.apache.kafka.common.metrics.MetricConfig;
  
  import java.util.List;
  
  /**
   * A {@link SampledStat} that maintains a simple average over its samples.
   */
  public class Avg extends SampledStat {
  
      public Avg() {
          super(0.0);
      }
  
      @Override
      protected void update(Sample sample, MetricConfig config, double value, long now) {
          sample.value += value;
      }
  
      @Override
      public double combine(List<Sample> samples, MetricConfig config, long now) {
          double total = 0.0;
          long count = 0;
          for (Sample s : samples) {
              total += s.value;
              count += s.eventCount;
          }
          return count == 0 ? Double.NaN : total / count;
      }
  
  }
  