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.parallel;
  
  import static org.junit.Assert.*;
  
  import java.util.List;
  import java.util.concurrent.TimeUnit;
  
  import org.junit.Test;
  import org.reactivestreams.Subscriber;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.*;
  import io.reactivex.rxjava3.functions.Predicate;
  import io.reactivex.rxjava3.internal.functions.Functions;
  import io.reactivex.rxjava3.internal.schedulers.ImmediateThinScheduler;
  import io.reactivex.rxjava3.internal.subscriptions.BooleanSubscription;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  import io.reactivex.rxjava3.processors.PublishProcessor;
  import io.reactivex.rxjava3.schedulers.Schedulers;
  import io.reactivex.rxjava3.subscribers.TestSubscriber;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class ParallelRunOnTest extends RxJavaTest {
  
      @Test
      public void subscriberCount() {
          ParallelFlowableTest.checkSubscriberCount(Flowable.range(1, 5).parallel()
          .runOn(Schedulers.computation()));
      }
  
      @Test
      public void doubleError() {
          List<Throwable> errors = TestHelper.trackPluginErrors();
          try {
              new ParallelInvalid()
              .runOn(ImmediateThinScheduler.INSTANCE)
              .sequential()
              .test()
              .assertFailure(TestException.class);
  
              assertFalse(errors.isEmpty());
              for (Throwable ex : errors) {
                  assertTrue(ex.toString(), ex.getCause() instanceof TestException);
              }
          } finally {
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void conditionalPath() {
          Flowable.range(1, 1000)
          .parallel(2)
          .runOn(Schedulers.computation())
          .filter(new Predicate<Integer>() {
              @Override
              public boolean test(Integer v) throws Exception {
                  return v % 2 == 0;
              }
          })
          .sequential()
          .test()
          .awaitDone(5, TimeUnit.SECONDS)
          .assertValueCount(500)
          .assertNoErrors()
          .assertComplete();
      }
  
      @Test
      public void missingBackpressure() {
          new ParallelFlowable<Integer>() {
              @Override
              public int parallelism() {
                  return 1;
              }
  
              @Override
              public void subscribe(Subscriber<? super Integer>[] subscribers) {
                  subscribers[0].onSubscribe(new BooleanSubscription());
                  subscribers[0].onNext(1);
                  subscribers[0].onNext(2);
                  subscribers[0].onNext(3);
              }
          }
          .runOn(ImmediateThinScheduler.INSTANCE, 1)
          .sequential(1)
          .test(0)
          .assertFailure(QueueOverflowException.class);
      }
  
      @Test
      public void error() {
          Flowable.error(new TestException())
          .parallel(1)
          .runOn(ImmediateThinScheduler.INSTANCE)
          .sequential()
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void errorBackpressured() {
          Flowable.error(new TestException())
          .parallel(1)
          .runOn(ImmediateThinScheduler.INSTANCE)
          .sequential(1)
          .test(0)
          .assertFailure(TestException.class);
      }
  
      @Test
      public void errorConditional() {
          Flowable.error(new TestException())
          .parallel(1)
          .runOn(ImmediateThinScheduler.INSTANCE)
          .filter(Functions.alwaysTrue())
          .sequential()
          .test()
          .assertFailure(TestException.class);
      }
  
      @SuppressWarnings("unchecked")
      @Test
      public void errorConditionalBackpressured() {
          TestSubscriber<Object> ts = new TestSubscriber<>(0L);
  
          Flowable.error(new TestException())
          .parallel(1)
          .runOn(ImmediateThinScheduler.INSTANCE)
          .filter(Functions.alwaysTrue())
          .subscribe(new Subscriber[] { ts });
  
          ts
          .assertFailure(TestException.class);
      }
  
      @SuppressWarnings("unchecked")
      @Test
      public void emptyConditionalBackpressured() {
          TestSubscriber<Object> ts = new TestSubscriber<>(0L);
  
          Flowable.empty()
          .parallel(1)
          .runOn(ImmediateThinScheduler.INSTANCE)
          .filter(Functions.alwaysTrue())
          .subscribe(new Subscriber[] { ts });
  
          ts
          .assertResult();
      }
  
      @Test
      public void nextCancelRace() {
          for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
              final PublishProcessor<Integer> pp = PublishProcessor.create();
  
              final TestSubscriber<Integer> ts = pp.parallel(1)
              .runOn(Schedulers.computation())
              .sequential()
              .test();
  
              Runnable r1 = new Runnable() {
                  @Override
                  public void run() {
                      pp.onNext(1);
                  }
              };
  
              Runnable r2 = new Runnable() {
                  @Override
                  public void run() {
                      ts.cancel();
                  }
              };
  
              TestHelper.race(r1, r2);
          }
      }
  
      @SuppressWarnings("unchecked")
      @Test
      public void nextCancelRaceBackpressured() {
          for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
              final PublishProcessor<Integer> pp = PublishProcessor.create();
  
              final TestSubscriber<Integer> ts = TestSubscriber.create(0L);
  
              pp.parallel(1)
              .runOn(Schedulers.computation())
              .subscribe(new Subscriber[] { ts });
  
              Runnable r1 = new Runnable() {
                  @Override
                  public void run() {
                      pp.onNext(1);
                  }
              };
  
              Runnable r2 = new Runnable() {
                  @Override
                  public void run() {
                      ts.cancel();
                  }
              };
  
              TestHelper.race(r1, r2);
          }
      }
  
      @Test
      public void nextCancelRaceConditional() {
          for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
              final PublishProcessor<Integer> pp = PublishProcessor.create();
  
              final TestSubscriber<Integer> ts = pp.parallel(1)
              .runOn(Schedulers.computation())
              .filter(Functions.alwaysTrue())
              .sequential()
              .test();
  
              Runnable r1 = new Runnable() {
                  @Override
                  public void run() {
                      pp.onNext(1);
                  }
              };
  
              Runnable r2 = new Runnable() {
                  @Override
                  public void run() {
                      ts.cancel();
                  }
              };
  
              TestHelper.race(r1, r2);
          }
      }
  
      @SuppressWarnings("unchecked")
      @Test
      public void nextCancelRaceBackpressuredConditional() {
          for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
              final PublishProcessor<Integer> pp = PublishProcessor.create();
  
              final TestSubscriber<Integer> ts = TestSubscriber.create(0L);
  
              pp.parallel(1)
              .runOn(Schedulers.computation())
              .filter(Functions.alwaysTrue())
              .subscribe(new Subscriber[] { ts });
  
              Runnable r1 = new Runnable() {
                  @Override
                  public void run() {
                      pp.onNext(1);
                  }
              };
  
              Runnable r2 = new Runnable() {
                  @Override
                  public void run() {
                      ts.cancel();
                  }
              };
  
              TestHelper.race(r1, r2);
          }
      }
  
      @SuppressWarnings("unchecked")
      @Test
      public void normalCancelAfterRequest1() {
  
          TestSubscriber<Integer> ts = new TestSubscriber<Integer>(1) {
              @Override
              public void onNext(Integer t) {
                  super.onNext(t);
                  cancel();
                  onComplete();
              }
          };
  
          Flowable.range(1, 5)
          .parallel(1)
          .runOn(ImmediateThinScheduler.INSTANCE)
          .subscribe(new Subscriber[] { ts });
  
          ts.assertResult(1);
      }
  
      @SuppressWarnings("unchecked")
      @Test
      public void conditionalCancelAfterRequest1() {
  
          TestSubscriber<Integer> ts = new TestSubscriber<Integer>(1) {
              @Override
              public void onNext(Integer t) {
                  super.onNext(t);
                  cancel();
                  onComplete();
              }
          };
  
          Flowable.range(1, 5)
          .parallel(1)
          .runOn(ImmediateThinScheduler.INSTANCE)
          .filter(Functions.alwaysTrue())
          .subscribe(new Subscriber[] { ts });
  
          ts.assertResult(1);
      }
  
      @Test
      public void doubleOnSubscribe() {
          TestHelper.checkDoubleOnSubscribeParallel(pf -> pf.runOn(ImmediateThinScheduler.INSTANCE));
      }
  
      @Test
      public void doubleOnSubscribeConditional() {
          TestHelper.checkDoubleOnSubscribeParallel(pf ->
              pf.runOn(ImmediateThinScheduler.INSTANCE)
              .filter(v -> true)
          );
      }
  
      @Test
      public void badRequest() {
          TestHelper.assertBadRequestReported(
                  ParallelFlowable.fromArray(PublishProcessor.create())
                  .runOn(ImmediateThinScheduler.INSTANCE)
          );
      }
  
      @SuppressWarnings("unchecked")
      @Test
      public void asManyItemsAsRequested() {
          TestSubscriber<Integer> ts = new TestSubscriber<>(0);
  
          Flowable.range(1, 5)
          .parallel(1)
          .runOn(ImmediateThinScheduler.INSTANCE)
          .subscribe(new Subscriber[] {
                  ts
          });
  
          ts
          .requestMore(5)
          .assertResult(1, 2, 3, 4, 5);
      }
  
      @SuppressWarnings("unchecked")
      @Test
      public void asManyItemsAsRequestedConditional() {
          TestSubscriber<Integer> ts = new TestSubscriber<>(0);
  
          Flowable.range(1, 5)
          .parallel(1)
          .runOn(ImmediateThinScheduler.INSTANCE)
          .filter(v -> true)
          .subscribe(new Subscriber[] {
                  ts
          });
  
          ts
          .requestMore(5)
          .assertResult(1, 2, 3, 4, 5);
      }
  }
  