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.TopicIdPartition;
  import org.apache.kafka.common.TopicPartition;
  import org.apache.kafka.common.Uuid;
  import org.apache.kafka.common.compress.Compression;
  import org.apache.kafka.common.message.FetchResponseData;
  import org.apache.kafka.common.network.Send;
  import org.apache.kafka.common.protocol.ApiKeys;
  import org.apache.kafka.common.protocol.Errors;
  import org.apache.kafka.common.record.MemoryRecords;
  import org.apache.kafka.common.record.SimpleRecord;
  import org.apache.kafka.common.requests.ByteBufferChannel;
  import org.apache.kafka.common.requests.FetchResponse;
  import org.apache.kafka.common.requests.ResponseHeader;
  
  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.nio.charset.StandardCharsets;
  import java.util.HashMap;
  import java.util.LinkedHashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.UUID;
  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 FetchResponseBenchmark {
      @Param({"10", "500", "1000"})
      private int topicCount;
  
      @Param({"3", "10", "20"})
      private int partitionCount;
  
      LinkedHashMap<TopicIdPartition, FetchResponseData.PartitionData> responseData;
  
      Map<String, Uuid> topicIds;
  
      Map<Uuid, String> topicNames;
  
      ResponseHeader header;
  
      FetchResponse fetchResponse;
  
      FetchResponseData fetchResponseData;
  
      @Setup(Level.Trial)
      public void setup() {
          MemoryRecords records = MemoryRecords.withRecords(Compression.NONE,
                  new SimpleRecord(1000, "key1".getBytes(StandardCharsets.UTF_8), "value1".getBytes(StandardCharsets.UTF_8)),
                  new SimpleRecord(1001, "key2".getBytes(StandardCharsets.UTF_8), "value2".getBytes(StandardCharsets.UTF_8)),
                  new SimpleRecord(1002, "key3".getBytes(StandardCharsets.UTF_8), "value3".getBytes(StandardCharsets.UTF_8)));
  
          this.responseData = new LinkedHashMap<>();
          this.topicIds = new HashMap<>();
          this.topicNames = new HashMap<>();
          for (int topicIdx = 0; topicIdx < topicCount; topicIdx++) {
              String topic = UUID.randomUUID().toString();
              Uuid id = Uuid.randomUuid();
              topicIds.put(topic, id);
              topicNames.put(id, topic);
              for (int partitionId = 0; partitionId < partitionCount; partitionId++) {
                  FetchResponseData.PartitionData partitionData = new FetchResponseData.PartitionData()
                                  .setPartitionIndex(partitionId)
                                  .setLastStableOffset(0)
                                  .setLogStartOffset(0)
                                  .setRecords(records);
                  responseData.put(new TopicIdPartition(id, new TopicPartition(topic, partitionId)), partitionData);
              }
          }
  
          this.header = new ResponseHeader(100, ApiKeys.FETCH.responseHeaderVersion(ApiKeys.FETCH.latestVersion()));
          this.fetchResponse = FetchResponse.of(Errors.NONE, 0, 0, responseData, List.of());
          this.fetchResponseData = this.fetchResponse.data();
      }
  
      @Benchmark
      public int testConstructFetchResponse() {
          FetchResponse fetchResponse = FetchResponse.of(Errors.NONE, 0, 0, responseData, List.of());
          return fetchResponse.data().responses().size();
      }
  
      @Benchmark
      public int testPartitionMapFromData() {
          return FetchResponse.of(fetchResponseData).responseData(topicNames, ApiKeys.FETCH.latestVersion()).size();
      }
  
      @Benchmark
      public int testSerializeFetchResponse() throws IOException {
          Send send = fetchResponse.toSend(header, ApiKeys.FETCH.latestVersion());
          ByteBufferChannel channel = new ByteBufferChannel(send.size());
          send.writeTo(channel);
          return channel.buffer().limit();
      }
  }
  