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.internal.operators.flowable;
  
  import static org.junit.Assert.*;
  
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.atomic.AtomicBoolean;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import org.junit.*;
  import org.reactivestreams.*;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.*;
  import io.reactivex.rxjava3.internal.functions.Functions;
  import io.reactivex.rxjava3.internal.subscriptions.BooleanSubscription;
  import io.reactivex.rxjava3.processors.PublishProcessor;
  import io.reactivex.rxjava3.schedulers.Schedulers;
  import io.reactivex.rxjava3.subscribers.TestSubscriber;
  import io.reactivex.rxjava3.testsupport.*;
  
  public class FlowablePublishFunctionTest extends RxJavaTest {
      @Test
      public void concatTakeFirstLastCompletes() {
          TestSubscriber<Integer> ts = new TestSubscriber<>();
  
          Flowable.range(1, 3)
                  .publish(f -> Flowable.concat(f.take(5), f.takeLast(5)))
                  .subscribe(ts);
  
          ts.assertValues(1, 2, 3);
          ts.assertNoErrors();
          ts.assertComplete();
      }
  
      @Test
      public void concatTakeFirstLastBackpressureCompletes() {
          TestSubscriber<Integer> ts = TestSubscriber.create(0L);
  
          Flowable.range(1, 6)
                  .publish(f -> Flowable.concat(f.take(5), f.takeLast(5)))
                  .subscribe(ts);
  
          ts.assertNoValues();
          ts.assertNoErrors();
          ts.assertNotComplete();
  
          ts.request(1); // make sure take() doesn't go unbounded
          ts.request(4);
  
          ts.assertValues(1, 2, 3, 4, 5);
          ts.assertNoErrors();
          ts.assertNotComplete();
  
          ts.request(5);
  
          ts.assertValues(1, 2, 3, 4, 5, 6);
          ts.assertNoErrors();
          ts.assertComplete();
      }
  
      @Test
      public void canBeCancelled() {
          TestSubscriber<Integer> ts = TestSubscriber.create();
  
          PublishProcessor<Integer> pp = PublishProcessor.create();
  
          pp.publish(f -> Flowable.concat(f.take(5), f.takeLast(5))).subscribe(ts);
  
          pp.onNext(1);
          pp.onNext(2);
  
          ts.assertValues(1, 2);
          ts.assertNoErrors();
          ts.assertNotComplete();
  
          ts.cancel();
  
          Assert.assertFalse("Source has subscribers?", pp.hasSubscribers());
      }
  
      @Test
      public void invalidPrefetch() {
          try {
              Flowable.<Integer>never().publish(Functions.identity(), -99);
              fail("Didn't throw IllegalArgumentException");
          } catch (IllegalArgumentException ex) {
              Assert.assertEquals("prefetch > 0 required but it was -99", ex.getMessage());
          }
      }
  
      @Test
      public void takeCompletes() {
          TestSubscriber<Integer> ts = TestSubscriber.create();
  
          PublishProcessor<Integer> pp = PublishProcessor.create();
  
          pp.publish(f -> f.take(1)).subscribe(ts);
  
          pp.onNext(1);
  
          ts.assertValues(1);
          ts.assertNoErrors();
          ts.assertComplete();
  
          Assert.assertFalse("Source has subscribers?", pp.hasSubscribers());
  
      }
  
      @Test
      public void oneStartOnly() {
  
          final AtomicInteger startCount = new AtomicInteger();
  
          TestSubscriber<Integer> ts = new TestSubscriber<Integer>() {
              @Override
              public void onStart() {
                  startCount.incrementAndGet();
              }
          };
  
          PublishProcessor<Integer> pp = PublishProcessor.create();
  
          pp.publish(f -> f.take(1)).subscribe(ts);
  
          Assert.assertEquals(1, startCount.get());
      }
  
      @Test
      public void takeCompletesUnsafe() {
          TestSubscriber<Integer> ts = TestSubscriber.create();
  
          PublishProcessor<Integer> pp = PublishProcessor.create();
  
          pp.publish(f -> f.take(1)).subscribe(ts);
  
          pp.onNext(1);
  
          ts.assertValues(1);
          ts.assertNoErrors();
          ts.assertComplete();
  
          Assert.assertFalse("Source has subscribers?", pp.hasSubscribers());
      }
  
      @Test
      public void directCompletesUnsafe() {
          TestSubscriber<Integer> ts = TestSubscriber.create();
  
          PublishProcessor<Integer> pp = PublishProcessor.create();
  
          pp.publish(Functions.identity()).subscribe(ts);
  
          pp.onNext(1);
          pp.onComplete();
  
          ts.assertValues(1);
          ts.assertNoErrors();
          ts.assertComplete();
  
          Assert.assertFalse("Source has subscribers?", pp.hasSubscribers());
      }
  
      @Test
      public void overflowMissingBackpressureException() {
          TestSubscriberEx<Integer> ts = new TestSubscriberEx<>(0);
  
          PublishProcessor<Integer> pp = PublishProcessor.create();
  
          pp.publish(Functions.identity()).subscribe(ts);
  
          for (int i = 0; i < Flowable.bufferSize() * 2; i++) {
              pp.onNext(i);
          }
  
          ts.assertNoValues();
          ts.assertError(MissingBackpressureException.class);
          ts.assertNotComplete();
  
          Assert.assertEquals(MissingBackpressureException.DEFAULT_MESSAGE,
                  ts.errors().get(0).getMessage());
          Assert.assertFalse("Source has subscribers?", pp.hasSubscribers());
      }
  
      @Test
      public void overflowMissingBackpressureExceptionDelayed() {
          TestSubscriberEx<Integer> ts = new TestSubscriberEx<>(0);
  
          PublishProcessor<Integer> pp = PublishProcessor.create();
  
          new FlowablePublishMulticast<>(pp, Functions.identity(), Flowable.bufferSize(), true).subscribe(ts);
  
          for (int i = 0; i < Flowable.bufferSize() * 2; i++) {
              pp.onNext(i);
          }
  
          ts.request(Flowable.bufferSize());
  
          ts.assertValueCount(Flowable.bufferSize());
          ts.assertError(MissingBackpressureException.class);
          ts.assertNotComplete();
  
          Assert.assertEquals(MissingBackpressureException.DEFAULT_MESSAGE, ts.errors().get(0).getMessage());
          Assert.assertFalse("Source has subscribers?", pp.hasSubscribers());
      }
  
      @Test
      public void emptyIdentityMapped() {
          Flowable.empty()
          .publish(Functions.identity())
          .test()
          .assertResult();
      }
  
      @Test
      public void independentlyMapped() {
          PublishProcessor<Integer> pp = PublishProcessor.create();
  
          TestSubscriber<Integer> ts = pp.publish(v -> Flowable.range(1, 5)).test(0);
  
          assertTrue("pp has no Subscribers?!", pp.hasSubscribers());
  
          ts.assertNoValues()
          .assertNoErrors()
          .assertNotComplete();
  
          ts.request(5);
  
          ts.assertResult(1, 2, 3, 4, 5);
  
          assertFalse("pp has Subscribers?!", pp.hasSubscribers());
      }
  
      @Test
      public void badSource() {
          TestHelper.checkBadSourceFlowable(f -> f.publish(Functions.identity()), false, 1, 1, 1);
      }
  
      @Test
      public void frontOverflow() {
          new Flowable<Integer>() {
              @Override
              protected void subscribeActual(Subscriber<? super Integer> s) {
                  s.onSubscribe(new BooleanSubscription());
                  for (int i = 0; i < 9; i++) {
                      s.onNext(i);
                  }
              }
          }
          .publish(Functions.identity(), 8)
          .test(0)
          .assertFailure(MissingBackpressureException.class);
      }
  
      @Test
      public void errorResubscribe() {
          Flowable.error(new TestException())
          .publish(f -> f.onErrorResumeWith(f))
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void fusedInputCrash() {
          Flowable.just(1)
          .map(v -> {
              throw new TestException();
          })
          .publish(Functions.identity())
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void error() {
          new FlowablePublishMulticast<>(Flowable.just(1).concatWith(Flowable.error(new TestException())),
                  Functions.identity(), 16, true)
          .test()
          .assertFailure(TestException.class, 1);
      }
  
      @Test
      public void backpressuredEmpty() {
          Flowable.<Integer>empty()
          .publish(Functions.identity())
          .test(0L)
          .assertResult();
      }
  
      @Test
      public void oneByOne() {
          Flowable.range(1, 10)
          .publish(Functions.identity())
          .rebatchRequests(1)
          .test()
          .assertResult(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
      }
  
      @Test
      public void completeCancelRaceNoRequest() {
          final PublishProcessor<Integer> pp = PublishProcessor.create();
  
          final TestSubscriber<Integer> ts = new TestSubscriber<Integer>(1L) {
              @Override
              public void onNext(Integer t) {
                  super.onNext(t);
                  if (t == 1) {
                      cancel();
                      onComplete();
                  }
              }
          };
  
          pp.publish(Functions.identity()).subscribe(ts);
  
          pp.onNext(1);
  
          assertFalse(pp.hasSubscribers());
  
          ts.assertResult(1);
      }
  
      @Test
      public void inputOutputSubscribeRace() {
          Flowable<Integer> source = Flowable.just(1)
                  .publish(f -> f.subscribeOn(Schedulers.single()));
  
          for (int i = 0; i < 500; i++) {
              source.test()
              .awaitDone(5, TimeUnit.SECONDS)
              .assertResult(1);
          }
      }
  
      @Test
      public void inputOutputSubscribeRace2() {
          Flowable<Integer> source = Flowable.just(1).subscribeOn(Schedulers.single())
                  .publish(Functions.identity());
  
          for (int i = 0; i < 500; i++) {
              source.test()
              .awaitDone(5, TimeUnit.SECONDS)
              .assertResult(1);
          }
      }
  
      @Test
      public void sourceSubscriptionDelayed() {
          for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
              final TestSubscriber<Integer> ts1 = new TestSubscriber<>(0L);
  
              Flowable.just(1)
                      .publish(f -> {
                          Runnable r1 = () -> f.subscribe(ts1);
  
                          Runnable r2 = () -> {
                              for (int j = 0; j < 100; j++) {
                                  ts1.request(1);
                              }
                          };
  
                          TestHelper.race(r1, r2);
                          return f;
                      }).test()
                      .assertResult(1);
  
              ts1.assertResult(1);
          }
      }
  
      @Test
      public void longFlow() {
          Flowable.range(1, 1000000)
          .publish(v -> Flowable.mergeArray(
                  v.filter(w -> w % 2 == 0),
                  v.filter(w -> w % 2 != 0)))
          .takeLast(1)
          .test()
          .assertResult(1000000);
      }
  
      @Test
      public void longFlow2() {
          Flowable.range(1, 100000)
          .publish(v -> Flowable.mergeArray(
                  v.filter(w -> w % 2 == 0),
                  v.filter(w -> w % 2 != 0)))
          .test()
          .assertValueCount(100000)
          .assertNoErrors()
          .assertComplete();
      }
  
      @Test
      public void longFlowHidden() {
          Flowable.range(1, 1000000).hide()
          .publish(v -> Flowable.mergeArray(
                  v.filter(w -> w % 2 == 0),
                  v.filter(w -> w % 2 != 0)))
          .takeLast(1)
          .test()
          .assertResult(1000000);
      }
  
      @Test
      public void noUpstreamCancelOnCasualChainClose() {
          AtomicBoolean parentUpstreamCancelled = new AtomicBoolean(false);
          Flowable.range(1, 10)
                  .doOnCancel(() -> parentUpstreamCancelled.set(true))
                  .publish(Functions.identity())
                  .test()
                  .awaitDone(1, TimeUnit.SECONDS);
          assertFalse("Unnecessary upstream .cancel() call in FlowablePublishMulticast", parentUpstreamCancelled.get());
      }
  
      @Test
      public void noUpstreamCancelOnCasualChainCloseWithInnerCancels() {
          AtomicBoolean parentUpstreamCancelled = new AtomicBoolean(false);
          Flowable.range(1, 10)
                  .doOnCancel(() -> parentUpstreamCancelled.set(true))
                  .publish(v -> Flowable.concat(v.take(1), v.skip(5)))
                  .test()
                  .awaitDone(1, TimeUnit.SECONDS);
          assertFalse("Unnecessary upstream .cancel() call in FlowablePublishMulticast", parentUpstreamCancelled.get());
      }
  
      @Test
      public void upstreamCancelOnDownstreamCancel() {
          AtomicBoolean parentUpstreamCancelled = new AtomicBoolean(false);
          Flowable.range(1, 10)
                  .doOnCancel(() -> parentUpstreamCancelled.set(true))
                  .publish(Functions.identity())
                  .take(1)
                  .test()
                  .awaitDone(1, TimeUnit.SECONDS);
          assertTrue("Upstream .cancel() not called in FlowablePublishMulticast", parentUpstreamCancelled.get());
      }
  }
  