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.core;
  
  import java.util.List;
  import java.util.concurrent.TimeUnit;
  
  import org.openjdk.jmh.annotations.*;
  import org.openjdk.jmh.infra.Blackhole;
  import org.reactivestreams.Publisher;
  
  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 RxVsStreamPerf {
      @Param({ "1", "1000", "1000000" })
      public int times;
  
      Flowable<Integer> range;
  
      Observable<Integer> rangeObservable;
  
      Flowable<Integer> rangeFlatMap;
  
      Observable<Integer> rangeObservableFlatMap;
  
      Flowable<Integer> rangeFlatMapJust;
  
      Observable<Integer> rangeObservableFlatMapJust;
  
      List<Integer> values;
  
      @Setup
      public void setup() {
          range = Flowable.range(1, times);
  
          rangeFlatMapJust = range.flatMap(new Function<Integer, Publisher<Integer>>() {
              @Override
              public Publisher<Integer> apply(Integer v) {
                  return Flowable.just(v);
              }
          });
  
          rangeFlatMap = range.flatMap(new Function<Integer, Publisher<Integer>>() {
              @Override
              public Publisher<Integer> apply(Integer v) {
                  return Flowable.range(v, 2);
              }
          });
  
          rangeObservable = Observable.range(1, times);
  
          rangeObservableFlatMapJust = rangeObservable.flatMap(new Function<Integer, Observable<Integer>>() {
              @Override
              public Observable<Integer> apply(Integer v) {
                  return Observable.just(v);
              }
          });
  
          rangeObservableFlatMap = rangeObservable.flatMap(new Function<Integer, Observable<Integer>>() {
              @Override
              public Observable<Integer> apply(Integer v) {
                  return Observable.range(v, 2);
              }
          });
  
          values = range.toList().blockingGet();
      }
  
      @Benchmark
      public void range(Blackhole bh) {
          range.subscribe(new PerfSubscriber(bh));
      }
  
      @Benchmark
      public void rangeObservable(Blackhole bh) {
          rangeObservable.subscribe(new PerfObserver(bh));
      }
  
      @Benchmark
      public void rangeFlatMap(Blackhole bh) {
          rangeFlatMap.subscribe(new PerfSubscriber(bh));
      }
  
      @Benchmark
      public void rangeObservableFlatMap(Blackhole bh) {
          rangeObservableFlatMap.subscribe(new PerfObserver(bh));
      }
  
      @Benchmark
      public void rangeFlatMapJust(Blackhole bh) {
          rangeFlatMapJust.subscribe(new PerfSubscriber(bh));
      }
  
      @Benchmark
      public void rangeObservableFlatMapJust(Blackhole bh) {
          rangeObservableFlatMapJust.subscribe(new PerfObserver(bh));
      }
  
  }
  