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;
  
  import org.apache.kafka.clients.consumer.ConsumerRebalanceListener;
  import org.apache.kafka.common.TopicPartition;
  
  import java.util.Collection;
  import java.util.Optional;
  import java.util.concurrent.atomic.AtomicInteger;
  
  public class CounterConsumerRebalanceListener implements ConsumerRebalanceListener {
  
      private final AtomicInteger revokedCounter = new AtomicInteger();
      private final AtomicInteger assignedCounter = new AtomicInteger();
      private final AtomicInteger lostCounter = new AtomicInteger();
  
      private final Optional<RuntimeException> revokedError;
      private final Optional<RuntimeException> assignedError;
      private final Optional<RuntimeException> lostError;
  
      public CounterConsumerRebalanceListener() {
          this(Optional.empty(), Optional.empty(), Optional.empty());
      }
  
      public CounterConsumerRebalanceListener(Optional<RuntimeException> revokedError,
                                              Optional<RuntimeException> assignedError,
                                              Optional<RuntimeException> lostError) {
          this.revokedError = revokedError;
          this.assignedError = assignedError;
          this.lostError = lostError;
      }
  
      @Override
      public void onPartitionsRevoked(Collection<TopicPartition> partitions) {
          try {
              if (revokedError.isPresent())
                  throw revokedError.get();
          } finally {
              revokedCounter.incrementAndGet();
          }
      }
  
      @Override
      public void onPartitionsAssigned(Collection<TopicPartition> partitions) {
          try {
              if (assignedError.isPresent())
                  throw assignedError.get();
          } finally {
              assignedCounter.incrementAndGet();
          }
      }
  
      @Override
      public void onPartitionsLost(Collection<TopicPartition> partitions) {
          try {
              if (lostError.isPresent())
                  throw lostError.get();
          } finally {
              lostCounter.incrementAndGet();
          }
      }
  
      public int revokedCount() {
          return revokedCounter.get();
      }
  
      public int assignedCount() {
          return assignedCounter.get();
      }
  
      public int lostCount() {
          return lostCounter.get();
      }
  }