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.clients.consumer.internals.metrics;
  
  import org.apache.kafka.common.MetricName;
  import org.apache.kafka.common.metrics.Metrics;
  import org.apache.kafka.common.metrics.Sensor;
  import org.apache.kafka.common.metrics.stats.CumulativeCount;
  import org.apache.kafka.common.metrics.stats.Rate;
  import org.apache.kafka.common.metrics.stats.WindowedCount;
  
  import java.util.concurrent.TimeUnit;
  
  import static org.apache.kafka.clients.consumer.internals.ConsumerUtils.CONSUMER_SHARE_METRIC_GROUP_PREFIX;
  import static org.apache.kafka.clients.consumer.internals.ConsumerUtils.COORDINATOR_METRICS_SUFFIX;
  
  public final class ShareRebalanceMetricsManager extends RebalanceMetricsManager {
      private final Sensor rebalanceSensor;
      public final MetricName rebalanceTotal;
      public final MetricName rebalanceRatePerHour;
      private long lastRebalanceEndMs = -1L;
      private long lastRebalanceStartMs = -1L;
  
      public ShareRebalanceMetricsManager(Metrics metrics) {
          super(CONSUMER_SHARE_METRIC_GROUP_PREFIX + COORDINATOR_METRICS_SUFFIX);
  
          rebalanceTotal = createMetric(metrics, "rebalance-total",
                  "The total number of rebalance events");
          rebalanceRatePerHour = createMetric(metrics, "rebalance-rate-per-hour",
                  "The number of rebalance events per hour");
  
          rebalanceSensor = metrics.sensor("rebalance-latency");
          rebalanceSensor.add(rebalanceTotal, new CumulativeCount());
          rebalanceSensor.add(rebalanceRatePerHour, new Rate(TimeUnit.HOURS, new WindowedCount()));
      }
  
      public void recordRebalanceStarted(long nowMs) {
          lastRebalanceStartMs = nowMs;
      }
  
      public void recordRebalanceEnded(long nowMs) {
          lastRebalanceEndMs = nowMs;
          rebalanceSensor.record(nowMs - lastRebalanceStartMs);
      }
  
      public boolean rebalanceStarted() {
          return lastRebalanceStartMs > lastRebalanceEndMs;
      }
  }
  