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.common;
  
  import org.apache.kafka.common.TopicPartition;
  import org.apache.kafka.common.Uuid;
  import org.apache.kafka.common.network.Send;
  import org.apache.kafka.common.protocol.ApiKeys;
  import org.apache.kafka.common.protocol.Readable;
  import org.apache.kafka.common.requests.AbstractRequest;
  import org.apache.kafka.common.requests.ByteBufferChannel;
  import org.apache.kafka.common.requests.FetchRequest;
  import org.apache.kafka.common.requests.RequestHeader;
  import org.apache.kafka.network.RequestConvertToJson;
  
  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.io.IOException;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Optional;
  import java.util.concurrent.TimeUnit;
  
  @State(Scope.Benchmark)
  @Fork(value = 1)
  @Warmup(iterations = 5)
  @Measurement(iterations = 15)
  @BenchmarkMode(Mode.AverageTime)
  @OutputTimeUnit(TimeUnit.NANOSECONDS)
  public class FetchRequestBenchmark {
  
      @Param({"10", "500", "1000"})
      private int topicCount;
  
      @Param({"3", "10", "20"})
      private int partitionCount;
  
      Map<TopicPartition, FetchRequest.PartitionData> fetchData;
  
      Map<Uuid, String> topicNames;
  
      RequestHeader header;
  
      FetchRequest consumerRequest;
  
      FetchRequest replicaRequest;
  
      Readable serializedRequest;
  
      @Setup(Level.Trial)
      public void setup() {
          this.fetchData = new HashMap<>();
          this.topicNames = new HashMap<>();
          for (int topicIdx = 0; topicIdx < topicCount; topicIdx++) {
              String topic = Uuid.randomUuid().toString();
              Uuid id = Uuid.randomUuid();
              topicNames.put(id, topic);
              for (int partitionId = 0; partitionId < partitionCount; partitionId++) {
                  FetchRequest.PartitionData partitionData = new FetchRequest.PartitionData(
                      id, 0, 0, 4096, Optional.empty());
                  fetchData.put(new TopicPartition(topic, partitionId), partitionData);
              }
          }
  
          this.header = new RequestHeader(ApiKeys.FETCH, ApiKeys.FETCH.latestVersion(), "jmh-benchmark", 100);
          this.consumerRequest = FetchRequest.Builder.forConsumer(ApiKeys.FETCH.latestVersion(), 0, 0, fetchData)
              .build(ApiKeys.FETCH.latestVersion());
          this.replicaRequest = FetchRequest.Builder.forReplica(ApiKeys.FETCH.latestVersion(), 1, 1, 0, 0, fetchData)
              .build(ApiKeys.FETCH.latestVersion());
          this.serializedRequest = this.consumerRequest.serialize();
  
      }
  
      @Benchmark
      public short testFetchRequestFromBuffer() {
          return AbstractRequest.parseRequest(ApiKeys.FETCH, ApiKeys.FETCH.latestVersion(), serializedRequest).request.version();
      }
  
      @Benchmark
      public int testFetchRequestForConsumer() {
          FetchRequest fetchRequest = FetchRequest.Builder.forConsumer(ApiKeys.FETCH.latestVersion(), 0, 0, fetchData)
              .build(ApiKeys.FETCH.latestVersion());
          return fetchRequest.fetchData(topicNames).size();
      }
  
      @Benchmark
      public int testFetchRequestForReplica() {
          FetchRequest fetchRequest = FetchRequest.Builder.forReplica(
              ApiKeys.FETCH.latestVersion(), 1, 1, 0, 0, fetchData)
                  .build(ApiKeys.FETCH.latestVersion());
          return fetchRequest.fetchData(topicNames).size();
      }
  
      @Benchmark
      public int testSerializeFetchRequestForConsumer() throws IOException {
          Send send = consumerRequest.toSend(header);
          ByteBufferChannel channel = new ByteBufferChannel(send.size());
          send.writeTo(channel);
          return channel.buffer().limit();
      }
  
      @Benchmark
      public int testSerializeFetchRequestForReplica() throws IOException {
          Send send = replicaRequest.toSend(header);
          ByteBufferChannel channel = new ByteBufferChannel(send.size());
          send.writeTo(channel);
          return channel.buffer().limit();
      }
  
      @Benchmark
      public String testRequestToJson() {
          return RequestConvertToJson.request(consumerRequest).toString();
      }
  }
  