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 java.util.List;
  import java.util.concurrent.atomic.AtomicReference;
  
  import org.junit.Test;
  import org.reactivestreams.Subscriber;
  
  import io.reactivex.rxjava3.annotations.NonNull;
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.*;
  import io.reactivex.rxjava3.functions.Function;
  import io.reactivex.rxjava3.internal.subscriptions.BooleanSubscription;
  import io.reactivex.rxjava3.processors.PublishProcessor;
  import io.reactivex.rxjava3.subscribers.TestSubscriber;
  import io.reactivex.rxjava3.testsupport.*;
  
  public class ParallelJoinTest extends RxJavaTest {
  
      @Test
      public void overflowFastpath() {
          new ParallelFlowable<Integer>() {
              @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);
              }
  
              @Override
              public int parallelism() {
                  return 1;
              }
          }
          .sequential(1)
          .test(0)
          .assertFailure(QueueOverflowException.class);
      }
  
      @Test
      public void overflowSlowpath() {
          @SuppressWarnings("unchecked")
          final Subscriber<? super Integer>[] subs = new Subscriber[1];
  
          TestSubscriber<Integer> ts = new TestSubscriber<Integer>(1) {
              @Override
              public void onNext(Integer t) {
                  super.onNext(t);
                  subs[0].onNext(2);
                  subs[0].onNext(3);
              }
          };
  
          new ParallelFlowable<Integer>() {
              @Override
              public void subscribe(Subscriber<? super Integer>[] subscribers) {
                  subs[0] = subscribers[0];
                  subscribers[0].onSubscribe(new BooleanSubscription());
                  subscribers[0].onNext(1);
              }
  
              @Override
              public int parallelism() {
                  return 1;
              }
          }
          .sequential(1)
          .subscribe(ts);
  
          ts.assertFailure(QueueOverflowException.class, 1);
      }
  
      @Test
      public void emptyBackpressured() {
          Flowable.empty()
          .parallel()
          .sequential()
          .test(0)
          .assertResult();
      }
  
      @Test
      public void overflowFastpathDelayError() {
          new ParallelFlowable<Integer>() {
              @Override
              public void subscribe(Subscriber<? super Integer>[] subscribers) {
                  subscribers[0].onSubscribe(new BooleanSubscription());
                  subscribers[0].onNext(1);
                  subscribers[0].onNext(2);
              }
  
              @Override
              public int parallelism() {
                  return 1;
              }
          }
          .sequentialDelayError(1)
          .test(0)
          .requestMore(1)
          .assertFailure(QueueOverflowException.class, 1);
      }
  
      @Test
      public void overflowSlowpathDelayError() {
          @SuppressWarnings("unchecked")
          final Subscriber<? super Integer>[] subs = new Subscriber[1];
  
          TestSubscriber<Integer> ts = new TestSubscriber<Integer>(1) {
              @Override
              public void onNext(Integer t) {
                  super.onNext(t);
                  if (t == 1) {
                      subs[0].onNext(2);
                      subs[0].onNext(3);
                  }
              }
          };
  
          new ParallelFlowable<Integer>() {
              @Override
              public void subscribe(Subscriber<? super Integer>[] subscribers) {
                  subs[0] = subscribers[0];
                  subscribers[0].onSubscribe(new BooleanSubscription());
                  subscribers[0].onNext(1);
              }
  
              @Override
              public int parallelism() {
                  return 1;
              }
          }
          .sequentialDelayError(1)
          .subscribe(ts);
  
          ts.request(1);
  
          ts.assertFailure(QueueOverflowException.class, 1, 2);
      }
  
      @Test
      public void emptyBackpressuredDelayError() {
          Flowable.empty()
          .parallel()
          .sequentialDelayError()
          .test(0)
          .assertResult();
      }
  
      @Test
      public void delayError() {
          TestSubscriberEx<Integer> flow = Flowable.range(1, 2)
          .parallel(2)
          .map(new Function<Integer, Integer>() {
              @Override
              public Integer apply(Integer v) throws Exception {
                  throw new TestException();
              }
          })
          .sequentialDelayError()
          .to(TestHelper.<Integer>testConsumer())
          .assertFailure(CompositeException.class);
  
          List<Throwable> error = TestHelper.errorList(flow);
          TestHelper.assertError(error, 0, TestException.class);
          TestHelper.assertError(error, 1, TestException.class);
      }
  
      @Test
      public void normalDelayError() {
          Flowable.just(1)
          .parallel(1)
          .sequentialDelayError(1)
          .test()
          .assertResult(1);
      }
  
      @Test
      public void rangeDelayError() {
          Flowable.range(1, 2)
          .parallel(1)
          .sequentialDelayError(1)
          .take(1)
          .test()
          .assertResult(1);
      }
  
      @Test
      public void rangeDelayErrorBackpressure() {
          Flowable.range(1, 3)
          .parallel(1)
          .sequentialDelayError(1)
          .take(2)
          .rebatchRequests(1)
          .test()
          .assertResult(1, 2);
      }
  
      @Test
      public void rangeDelayErrorBackpressure2() {
          Flowable.range(1, 3)
          .parallel(1)
          .sequentialDelayError(1)
          .rebatchRequests(1)
          .test()
          .assertResult(1, 2, 3);
      }
  
      @Test
      public void delayErrorCancelBackpressured() {
          TestSubscriber<Integer> ts = Flowable.range(1, 3)
          .parallel(1)
          .sequentialDelayError(1)
          .test(0);
  
          ts
          .cancel();
  
          ts.assertEmpty();
      }
  
      @Test
      public void delayErrorCancelBackpressured2() {
          TestSubscriber<Integer> ts = Flowable.<Integer>empty()
          .parallel(1)
          .sequentialDelayError(1)
          .test(0);
  
          ts.assertResult();
      }
  
      @Test
      public void consumerCancelsAfterOne() {
          TestSubscriber<Integer> ts = new TestSubscriber<Integer>(1) {
              @Override
              public void onNext(Integer t) {
                  super.onNext(t);
                  cancel();
                  onComplete();
              }
          };
  
          Flowable.range(1, 3)
          .parallel(1)
          .sequential()
          .subscribe(ts);
  
          ts.assertResult(1);
      }
  
      @Test
      public void delayErrorConsumerCancelsAfterOne() {
          TestSubscriber<Integer> ts = new TestSubscriber<Integer>(1) {
              @Override
              public void onNext(Integer t) {
                  super.onNext(t);
                  cancel();
                  onComplete();
              }
          };
  
          Flowable.range(1, 3)
          .parallel(1)
          .sequentialDelayError()
          .subscribe(ts);
  
          ts.assertResult(1);
      }
  
      @Test
      public void delayErrorDrainTrigger() {
          Flowable.range(1, 3)
          .parallel(1)
          .sequentialDelayError()
          .test(0)
          .requestMore(1)
          .assertValues(1)
          .requestMore(1)
          .assertValues(1, 2)
          .requestMore(1)
          .assertResult(1, 2, 3);
      }
  
      @Test
      public void failedRailIsIgnored() {
          Flowable.range(1, 4)
          .parallel(2)
          .map(new Function<Integer, Integer>() {
              @Override
              public Integer apply(Integer v) throws Exception {
                  if (v == 1) {
                      throw new TestException();
                  }
                  return v;
              }
          })
          .sequentialDelayError()
          .test()
          .assertFailure(TestException.class, 2, 3, 4);
      }
  
      @Test
      public void failedRailIsIgnoredHidden() {
          Flowable.range(1, 4).hide()
          .parallel(2)
          .map(new Function<Integer, Integer>() {
              @Override
              public Integer apply(Integer v) throws Exception {
                  if (v == 1) {
                      throw new TestException();
                  }
                  return v;
              }
          })
          .sequentialDelayError()
          .test()
          .assertFailure(TestException.class, 2, 3, 4);
      }
  
      @Test
      public void takeUntil() {
          Flowable.range(1, 10)
          .parallel(1)
          .sequential()
          .takeUntil(v -> true)
          .test(0L)
          .requestMore(100)
          .assertResult(1);
      }
  
      @Test
      public void takeUntilDelayError() {
          Flowable.range(1, 10)
          .parallel(1)
          .sequentialDelayError()
          .takeUntil(v -> true)
          .test(0L)
          .requestMore(100)
          .assertResult(1);
      }
  
      @Test
      public void oneItemNext() {
          PublishProcessor<Integer> pp = PublishProcessor.create();
  
          TestSubscriber<Integer> ts = pp.parallel(1)
          .sequential()
          .test(0L);
  
          pp.onNext(1);
  
          ts.requestMore(10)
          .assertValuesOnly(1);
      }
  
      @Test
      public void delayErrorOneItemNext() {
          PublishProcessor<Integer> pp = PublishProcessor.create();
  
          TestSubscriber<Integer> ts = pp.parallel(1)
          .sequentialDelayError()
          .test(0L);
  
          pp.onNext(1);
  
          ts.requestMore(10)
          .assertValuesOnly(1);
      }
  
      @Test
      public void onNextWhileProcessingSlowPath() {
          PublishProcessor<Integer> pp = PublishProcessor.create();
  
          TestSubscriber<Integer> ts = new TestSubscriber<Integer>() {
              @Override
              public void onNext(@NonNull Integer t) {
                  super.onNext(t);
                  if (t == 1) {
                      pp.onNext(2);
                  }
              }
          };
  
          ParallelFlowable.fromArray(pp)
          .sequential()
          .subscribeWith(ts);
  
          pp.onNext(1);
  
          ts
          .assertValuesOnly(1, 2);
      }
  
      @Test
      public void delayErrorOnNextWhileProcessingSlowPath() {
          PublishProcessor<Integer> pp = PublishProcessor.create();
  
          TestSubscriber<Integer> ts = new TestSubscriber<Integer>() {
              @Override
              public void onNext(@NonNull Integer t) {
                  super.onNext(t);
                  if (t == 1) {
                      pp.onNext(2);
                  }
              }
          };
  
          ParallelFlowable.fromArray(pp)
          .sequentialDelayError()
          .subscribeWith(ts);
  
          pp.onNext(1);
  
          ts
          .assertValuesOnly(1, 2);
      }
  
      @Test
      public void badRequest() {
          TestHelper.assertBadRequestReported(
                  ParallelFlowable.fromArray(PublishProcessor.create())
                  .sequential()
          );
      }
  
      @Test
      public void onNextMissingBackpressureRace() throws Throwable {
          TestHelper.withErrorTracking(errors -> {
              for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
  
                  AtomicReference<Subscriber<? super Integer>> ref1 = new AtomicReference<>();
                  AtomicReference<Subscriber<? super Integer>> ref2 = new AtomicReference<>();
  
                  Flowable<Integer> f1 = new Flowable<Integer>() {
                      @Override
                      public void subscribeActual(Subscriber<? super Integer> s) {
                          s.onSubscribe(new BooleanSubscription());
                          ref1.set(s);
                      }
                  };
                  Flowable<Integer> f2 = new Flowable<Integer>() {
                      @Override
                      public void subscribeActual(Subscriber<? super Integer> s) {
                          s.onSubscribe(new BooleanSubscription());
                          ref2.set(s);
                      }
                  };
  
                  ParallelFlowable.fromArray(f1, f2)
                  .sequential(1)
                  .test(0)
                  ;
  
                  TestHelper.race(
                          () -> {
                              ref1.get().onNext(1);
                              ref1.get().onNext(2);
                          },
                          () -> {
                              ref2.get().onNext(3);
                              ref2.get().onNext(4);
                          }
                  );
  
                  errors.clear();
              }
          });
      }
  
      @Test
      public void onNextMissingBackpressureDelayErrorRace() throws Throwable {
          TestHelper.withErrorTracking(errors -> {
              for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
  
                  AtomicReference<Subscriber<? super Integer>> ref1 = new AtomicReference<>();
                  AtomicReference<Subscriber<? super Integer>> ref2 = new AtomicReference<>();
  
                  Flowable<Integer> f1 = new Flowable<Integer>() {
                      @Override
                      public void subscribeActual(Subscriber<? super Integer> s) {
                          s.onSubscribe(new BooleanSubscription());
                          ref1.set(s);
                      }
                  };
                  Flowable<Integer> f2 = new Flowable<Integer>() {
                      @Override
                      public void subscribeActual(Subscriber<? super Integer> s) {
                          s.onSubscribe(new BooleanSubscription());
                          ref2.set(s);
                      }
                  };
  
                  ParallelFlowable.fromArray(f1, f2)
                  .sequentialDelayError(1)
                  .test(0)
                  ;
  
                  TestHelper.race(
                          () -> {
                              ref1.get().onNext(1);
                              ref1.get().onNext(2);
                          },
                          () -> {
                              ref2.get().onNext(3);
                              ref2.get().onNext(4);
                          }
                  );
  
                  errors.clear();
              }
          });
      }
  }
  