code: /*
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * Licensed 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 io.reactivex.rxjava3.xmapz;
  
  import java.util.Arrays;
  import java.util.concurrent.TimeUnit;
  
  import org.openjdk.jmh.annotations.*;
  import org.openjdk.jmh.infra.Blackhole;
  import org.reactivestreams.Publisher;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.functions.Function;
  
  @BenchmarkMode(Mode.Throughput)
  @Warmup(iterations = 5)
  @Measurement(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
  @OutputTimeUnit(TimeUnit.SECONDS)
  @Fork(value = 1)
  @State(Scope.Thread)
  public class FlowableFlatMapSinglePerf {
      @Param({ "1", "10", "100", "1000", "10000", "100000", "1000000" })
      public int count;
  
      Flowable<Integer> flowableConvert;
  
      Flowable<Integer> flowableDedicated;
  
      Flowable<Integer> flowablePlain;
  
      @Setup
      public void setup() {
          Integer[] sourceArray = new Integer[count];
          Arrays.fill(sourceArray, 777);
  
          Flowable<Integer> source = Flowable.fromArray(sourceArray);
  
          flowablePlain = source.flatMap(new Function<Integer, Publisher<? extends Integer>>() {
              @Override
              public Publisher<? extends Integer> apply(Integer v) {
                  return Flowable.just(v);
              }
          });
  
          flowableConvert = source.flatMap(new Function<Integer, Publisher<? extends Integer>>() {
              @Override
              public Publisher<? extends Integer> apply(Integer v) {
                  return Single.just(v).toFlowable();
              }
          });
  
          flowableDedicated = source.flatMapSingle(new Function<Integer, Single<? extends Integer>>() {
              @Override
              public Single<? extends Integer> apply(Integer v) {
                  return Single.just(v);
              }
          });
      }
  
      @Benchmark
      public Object flowablePlain(Blackhole bh) {
          return flowablePlain.subscribeWith(new PerfConsumer(bh));
      }
  
      @Benchmark
      public Object flowableConvert(Blackhole bh) {
          return flowableConvert.subscribeWith(new PerfConsumer(bh));
      }
  
      @Benchmark
      public Object flowableDedicated(Blackhole bh) {
          return flowableDedicated.subscribeWith(new PerfConsumer(bh));
      }
  }
  