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 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 FlattenJustPerf {
      @Param({ "1", "10", "100", "1000", "10000", "100000", "1000000" })
      public int times;
  
      Flowable<Integer> flowable;
  
      Observable<Integer> observable;
  
      @Setup
      public void setup() {
          Integer[] array = new Integer[times];
          Arrays.fill(array, 777);
  
          final Iterable<Integer> singletonList = Collections.singletonList(1);
  
          flowable = Flowable.fromArray(array).flatMapIterable(new Function<Integer, Iterable<Integer>>() {
              @Override
              public Iterable<Integer> apply(Integer v) {
                  return singletonList;
              }
          });
  
          observable = Observable.fromArray(array).flatMapIterable(new Function<Integer, Iterable<Integer>>() {
              @Override
              public Iterable<Integer> apply(Integer v) {
                  return singletonList;
              }
          });
      }
  
      @Benchmark
      public void flowable(Blackhole bh) {
          flowable.subscribe(new PerfConsumer(bh));
      }
  
      @Benchmark
      public void observable(Blackhole bh) {
          observable.subscribe(new PerfConsumer(bh));
      }
  }
  