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.jmh.consumer;
  
  import org.apache.kafka.clients.Metadata;
  import org.apache.kafka.clients.consumer.internals.AutoOffsetResetStrategy;
  import org.apache.kafka.clients.consumer.internals.SubscriptionState;
  import org.apache.kafka.common.Node;
  import org.apache.kafka.common.TopicPartition;
  import org.apache.kafka.common.utils.LogContext;
  
  import org.openjdk.jmh.annotations.Benchmark;
  import org.openjdk.jmh.annotations.BenchmarkMode;
  import org.openjdk.jmh.annotations.Fork;
  import org.openjdk.jmh.annotations.Level;
  import org.openjdk.jmh.annotations.Measurement;
  import org.openjdk.jmh.annotations.Mode;
  import org.openjdk.jmh.annotations.OutputTimeUnit;
  import org.openjdk.jmh.annotations.Param;
  import org.openjdk.jmh.annotations.Scope;
  import org.openjdk.jmh.annotations.Setup;
  import org.openjdk.jmh.annotations.State;
  import org.openjdk.jmh.annotations.Warmup;
  
  import java.util.HashSet;
  import java.util.Optional;
  import java.util.Set;
  import java.util.concurrent.TimeUnit;
  import java.util.stream.IntStream;
  
  @State(Scope.Benchmark)
  @Fork(value = 1)
  @Warmup(iterations = 5)
  @Measurement(iterations = 15)
  @BenchmarkMode(Mode.AverageTime)
  @OutputTimeUnit(TimeUnit.MILLISECONDS)
  public class SubscriptionStateBenchmark {
      @Param({"5000"})
      int topicCount;
  
      @Param({"50"})
      int partitionCount;
  
      SubscriptionState subscriptionState;
  
      @Setup(Level.Trial)
      public void setup() {
          Set<TopicPartition> assignment = new HashSet<>(topicCount * partitionCount);
          IntStream.range(0, topicCount).forEach(topicId ->
              IntStream.range(0, partitionCount).forEach(partitionId ->
                  assignment.add(new TopicPartition(String.format("topic-%04d", topicId), partitionId))
              )
          );
          subscriptionState = new SubscriptionState(new LogContext(), AutoOffsetResetStrategy.EARLIEST);
          subscriptionState.assignFromUser(assignment);
          SubscriptionState.FetchPosition position = new SubscriptionState.FetchPosition(
              0L,
              Optional.of(0),
              new Metadata.LeaderAndEpoch(Optional.of(new Node(0, "host", 9092)), Optional.of(10))
          );
          assignment.forEach(topicPartition -> {
              subscriptionState.seekUnvalidated(topicPartition, position);
              subscriptionState.completeValidation(topicPartition);
          });
      }
  
      @Benchmark
      public boolean testHasAllFetchPositions() {
          return subscriptionState.hasAllFetchPositions();
      }
  
      @Benchmark
      public int testFetchablePartitions() {
          return subscriptionState.fetchablePartitions(tp -> true).size();
      }
  
      @Benchmark
      public int testPartitionsNeedingValidation() {
          return subscriptionState.partitionsNeedingValidation(0L).size();
      }
  }
  