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;
  
  /**
   * A simple rate the rate is incrementally calculated
   * based on the elapsed time between the earliest reading
   * and now.
   *
   * An exception is made for the first window, which is
   * considered of fixed size. This avoids the issue of
   * an artificially high rate when the gap between readings
   * is close to 0.
   */
  public class SimpleRate extends Rate {
  
      @Override
      public long windowSize(MetricConfig config, long now) {
          stat.purgeObsoleteSamples(config, now);
          long elapsed = now - stat.oldest(now).startTimeMs;
          return Math.max(elapsed, config.timeWindowMs());
      }
  }
  