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.*;
  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 = 5, timeUnit = TimeUnit.SECONDS)
  @OutputTimeUnit(TimeUnit.SECONDS)
  @Fork(value = 1)
  @State(Scope.Thread)
  public class BinaryFlatMapPerf {
      @Param({ "1", "1000", "1000000" })
      public int times;
  
      Flowable<Integer> singleFlatMapPublisher;
  
      Flowable<Integer> singleFlatMapHidePublisher;
  
      Flowable<Integer> singleFlattenAsPublisher;
  
      Flowable<Integer> maybeFlatMapPublisher;
  
      Flowable<Integer> maybeFlatMapHidePublisher;
  
      Flowable<Integer> maybeFlattenAsPublisher;
  
      Flowable<Integer> completableFlatMapPublisher;
  
      Flowable<Integer> completableFlattenAsPublisher;
  
      Observable<Integer> singleFlatMapObservable;
  
      Observable<Integer> singleFlatMapHideObservable;
  
      Observable<Integer> singleFlattenAsObservable;
  
      Observable<Integer> maybeFlatMapObservable;
  
      Observable<Integer> maybeFlatMapHideObservable;
  
      Observable<Integer> maybeFlattenAsObservable;
  
      Observable<Integer> completableFlatMapObservable;
  
      Observable<Integer> completableFlattenAsObservable;
  
      @Setup
      public void setup() {
  
          // --------------------------------------------------------------------------
  
          final Integer[] array = new Integer[times];
          Arrays.fill(array, 777);
  
          final List<Integer> list = Arrays.asList(array);
  
          final Flowable<Integer> arrayFlowable = Flowable.fromArray(array);
          final Flowable<Integer> arrayFlowableHide = Flowable.fromArray(array).hide();
          final Flowable<Integer> listFlowable = Flowable.fromIterable(list);
  
          final Observable<Integer> arrayObservable = Observable.fromArray(array);
          final Observable<Integer> arrayObservableHide = Observable.fromArray(array).hide();
          final Observable<Integer> listObservable = Observable.fromIterable(list);
  
          // --------------------------------------------------------------------------
  
          singleFlatMapPublisher = Single.just(1).flatMapPublisher(new Function<Integer, Publisher<? extends Integer>>() {
              @Override
              public Publisher<? extends Integer> apply(Integer v) {
                  return arrayFlowable;
              }
          });
  
          singleFlatMapHidePublisher = Single.just(1).flatMapPublisher(new Function<Integer, Publisher<? extends Integer>>() {
              @Override
              public Publisher<? extends Integer> apply(Integer v) {
                  return arrayFlowableHide;
              }
          });
  
          singleFlattenAsPublisher = Single.just(1).flattenAsFlowable(new Function<Integer, Iterable<? extends Integer>>() {
              @Override
              public Iterable<? extends Integer> apply(Integer v) {
                  return list;
              }
          });
  
          maybeFlatMapPublisher = Maybe.just(1).flatMapPublisher(new Function<Integer, Publisher<? extends Integer>>() {
              @Override
              public Publisher<? extends Integer> apply(Integer v) {
                  return arrayFlowable;
              }
          });
  
          maybeFlatMapHidePublisher = Maybe.just(1).flatMapPublisher(new Function<Integer, Publisher<? extends Integer>>() {
              @Override
              public Publisher<? extends Integer> apply(Integer v) {
                  return arrayFlowableHide;
              }
          });
  
          maybeFlattenAsPublisher = Maybe.just(1).flattenAsFlowable(new Function<Integer, Iterable<? extends Integer>>() {
              @Override
              public Iterable<? extends Integer> apply(Integer v) {
                  return list;
              }
          });
  
          completableFlatMapPublisher = Completable.complete().andThen(listFlowable);
  
          completableFlattenAsPublisher = Completable.complete().andThen(arrayFlowable);
  
          // --------------------------------------------------------------------------
  
          singleFlatMapObservable = Single.just(1).flatMapObservable(new Function<Integer, Observable<? extends Integer>>() {
              @Override
              public Observable<? extends Integer> apply(Integer v) {
                  return arrayObservable;
              }
          });
  
          singleFlatMapHideObservable = Single.just(1).flatMapObservable(new Function<Integer, Observable<? extends Integer>>() {
              @Override
              public Observable<? extends Integer> apply(Integer v) {
                  return arrayObservableHide;
              }
          });
  
          singleFlattenAsObservable = Single.just(1).flattenAsObservable(new Function<Integer, Iterable<? extends Integer>>() {
              @Override
              public Iterable<? extends Integer> apply(Integer v) {
                  return list;
              }
          });
  
          maybeFlatMapObservable = Maybe.just(1).flatMapObservable(new Function<Integer, Observable<? extends Integer>>() {
              @Override
              public Observable<? extends Integer> apply(Integer v) {
                  return arrayObservable;
              }
          });
  
          maybeFlatMapHideObservable = Maybe.just(1).flatMapObservable(new Function<Integer, Observable<? extends Integer>>() {
              @Override
              public Observable<? extends Integer> apply(Integer v) {
                  return arrayObservableHide;
              }
          });
  
          maybeFlattenAsObservable = Maybe.just(1).flattenAsObservable(new Function<Integer, Iterable<? extends Integer>>() {
              @Override
              public Iterable<? extends Integer> apply(Integer v) {
                  return list;
              }
          });
  
          completableFlatMapObservable = Completable.complete().andThen(listObservable);
  
          completableFlattenAsObservable = Completable.complete().andThen(arrayObservable);
  
      }
  
      @Benchmark
      public void singleFlatMapPublisher(Blackhole bh) {
          singleFlatMapPublisher.subscribe(new PerfConsumer(bh));
      }
  
      @Benchmark
      public void singleFlatMapHidePublisher(Blackhole bh) {
          singleFlatMapHidePublisher.subscribe(new PerfConsumer(bh));
      }
  
      @Benchmark
      public void singleFlattenAsPublisher(Blackhole bh) {
          singleFlattenAsPublisher.subscribe(new PerfConsumer(bh));
      }
  
      @Benchmark
      public void maybeFlatMapPublisher(Blackhole bh) {
          maybeFlatMapPublisher.subscribe(new PerfConsumer(bh));
      }
  
      @Benchmark
      public void maybeFlatMapHidePublisher(Blackhole bh) {
          maybeFlatMapHidePublisher.subscribe(new PerfConsumer(bh));
      }
  
      @Benchmark
      public void maybeFlattenAsPublisher(Blackhole bh) {
          maybeFlattenAsPublisher.subscribe(new PerfConsumer(bh));
      }
  
      @Benchmark
      public void completableFlatMapPublisher(Blackhole bh) {
          completableFlatMapPublisher.subscribe(new PerfConsumer(bh));
      }
  
      @Benchmark
      public void completableFlattenAsPublisher(Blackhole bh) {
          completableFlattenAsPublisher.subscribe(new PerfConsumer(bh));
      }
  
      @Benchmark
      public void singleFlatMapObservable(Blackhole bh) {
          singleFlatMapObservable.subscribe(new PerfConsumer(bh));
      }
  
      @Benchmark
      public void singleFlatMapHideObservable(Blackhole bh) {
          singleFlatMapHideObservable.subscribe(new PerfConsumer(bh));
      }
  
      @Benchmark
      public void singleFlattenAsObservable(Blackhole bh) {
          singleFlattenAsObservable.subscribe(new PerfConsumer(bh));
      }
  
      @Benchmark
      public void maybeFlatMapObservable(Blackhole bh) {
          maybeFlatMapObservable.subscribe(new PerfConsumer(bh));
      }
  
      @Benchmark
      public void maybeFlatMapHideObservable(Blackhole bh) {
          maybeFlatMapHideObservable.subscribe(new PerfConsumer(bh));
      }
  
      @Benchmark
      public void maybeFlattenAsObservable(Blackhole bh) {
          maybeFlattenAsObservable.subscribe(new PerfConsumer(bh));
      }
  
      @Benchmark
      public void completableFlatMapObservable(Blackhole bh) {
          completableFlatMapObservable.subscribe(new PerfConsumer(bh));
      }
  
      @Benchmark
      public void completableFlattenAsObservable(Blackhole bh) {
          completableFlattenAsObservable.subscribe(new PerfConsumer(bh));
      }
  }
  