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.jdk8;
  
  import static org.junit.Assert.*;
  
  import java.util.*;
  import java.util.concurrent.TimeUnit;
  import java.util.function.*;
  import java.util.stream.*;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.TestException;
  import io.reactivex.rxjava3.parallel.ParallelInvalid;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  import io.reactivex.rxjava3.processors.BehaviorProcessor;
  import io.reactivex.rxjava3.schedulers.Schedulers;
  import io.reactivex.rxjava3.subscribers.TestSubscriber;
  import io.reactivex.rxjava3.testsupport.*;
  
  public class ParallelCollectorTest extends RxJavaTest {
  
      static Set<Integer> set(int count) {
          return IntStream.rangeClosed(1, count)
                  .boxed()
                  .collect(Collectors.toSet());
      }
  
      @Test
      public void basic() {
          TestSubscriberEx<List<Integer>> ts = Flowable.range(1, 5)
          .parallel()
          .collect(Collectors.toList())
          .subscribeWith(new TestSubscriberEx<>());
  
          ts
          .assertValueCount(1)
          .assertNoErrors()
          .assertComplete();
  
          assertEquals(5, ts.values().get(0).size());
          assertTrue(ts.values().get(0).containsAll(set(5)));
      }
  
      @Test
      public void empty() {
          Flowable.empty()
          .parallel()
          .collect(Collectors.toList())
          .test()
          .assertResult(Collections.emptyList());
      }
  
      @Test
      public void error() {
          Flowable.error(new TestException())
          .parallel()
          .collect(Collectors.toList())
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void collectorSupplierCrash() {
          Flowable.range(1, 5)
          .parallel()
          .collect(new Collector<Integer, Integer, Integer>() {
  
              @Override
              public Supplier<Integer> supplier() {
                  throw new TestException();
              }
  
              @Override
              public BiConsumer<Integer, Integer> accumulator() {
                  return (a, b) -> { };
              }
  
              @Override
              public BinaryOperator<Integer> combiner() {
                  return (a, b) -> a + b;
              }
  
              @Override
              public Function<Integer, Integer> finisher() {
                  return a -> a;
              }
  
              @Override
              public Set<Characteristics> characteristics() {
                  return Collections.emptySet();
              }
          })
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void collectorAccumulatorCrash() {
          BehaviorProcessor<Integer> source = BehaviorProcessor.createDefault(1);
  
          source
          .parallel()
          .collect(new Collector<Integer, Integer, Integer>() {
  
              @Override
              public Supplier<Integer> supplier() {
                  return () -> 1;
              }
  
              @Override
              public BiConsumer<Integer, Integer> accumulator() {
                  return (a, b) -> { throw new TestException(); };
              }
  
              @Override
              public BinaryOperator<Integer> combiner() {
                  return (a, b) -> a + b;
              }
  
              @Override
              public Function<Integer, Integer> finisher() {
                  return a -> a;
              }
  
              @Override
              public Set<Characteristics> characteristics() {
                  return Collections.emptySet();
              }
          })
          .test()
          .assertFailure(TestException.class);
  
          assertFalse(source.hasSubscribers());
      }
  
      @Test
      @SuppressUndeliverable
      public void collectorCombinerCrash() {
          Flowable.range(1, 5)
          .parallel()
          .collect(new Collector<Integer, Integer, Integer>() {
  
              @Override
              public Supplier<Integer> supplier() {
                  return () -> 1;
              }
  
              @Override
              public BiConsumer<Integer, Integer> accumulator() {
                  return (a, b) -> {  };
              }
  
              @Override
              public BinaryOperator<Integer> combiner() {
                  return (a, b) -> { throw new TestException(); };
              }
  
              @Override
              public Function<Integer, Integer> finisher() {
                  return a -> a;
              }
  
              @Override
              public Set<Characteristics> characteristics() {
                  return Collections.emptySet();
              }
          })
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void collectorFinisherCrash() {
          Flowable.range(1, 5)
          .parallel()
          .collect(new Collector<Integer, Integer, Integer>() {
  
              @Override
              public Supplier<Integer> supplier() {
                  return () -> 1;
              }
  
              @Override
              public BiConsumer<Integer, Integer> accumulator() {
                  return (a, b) -> {  };
              }
  
              @Override
              public BinaryOperator<Integer> combiner() {
                  return (a, b) -> a + b;
              }
  
              @Override
              public Function<Integer, Integer> finisher() {
                  return a -> { throw new TestException(); };
              }
  
              @Override
              public Set<Characteristics> characteristics() {
                  return Collections.emptySet();
              }
          })
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void async() {
          for (int i = 1; i < 32; i++) {
              TestSubscriber<List<Integer>> ts = Flowable.range(1, 1000)
              .parallel(i)
              .runOn(Schedulers.computation())
              .collect(Collectors.toList())
              .test()
              .withTag("Parallelism: " + i)
              .awaitDone(5, TimeUnit.SECONDS)
              .assertValueCount(1)
              .assertNoErrors()
              .assertComplete();
  
              assertEquals(1000, ts.values().get(0).size());
  
              assertTrue(ts.values().get(0).containsAll(set(1000)));
          }
      }
  
      @Test
      public void asyncHidden() {
          for (int i = 1; i < 32; i++) {
              TestSubscriber<List<Integer>> ts = Flowable.range(1, 1000)
              .hide()
              .parallel(i)
              .runOn(Schedulers.computation())
              .collect(Collectors.toList())
              .test()
              .withTag("Parallelism: " + i)
              .awaitDone(5, TimeUnit.SECONDS)
              .assertValueCount(1)
              .assertNoErrors()
              .assertComplete();
  
              assertEquals(1000, ts.values().get(0).size());
  
              assertTrue(ts.values().get(0).containsAll(set(1000)));
          }
      }
  
      @Test
      public void doubleError() {
          List<Throwable> errors = TestHelper.trackPluginErrors();
          try {
              new ParallelInvalid()
              .collect(Collectors.toList())
              .test()
              .assertFailure(TestException.class);
  
              assertFalse(errors.isEmpty());
              for (Throwable ex : errors) {
                  assertTrue(ex.toString(), ex.getCause() instanceof TestException);
              }
          } finally {
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void asyncSum() {
          long n = 1_000;
          for (int i = 1; i < 32; i++) {
              Flowable.rangeLong(1, n)
              .parallel(i)
              .runOn(Schedulers.computation())
              .collect(Collectors.summingLong(v -> v))
              .test()
              .withTag("Parallelism: " + i)
              .awaitDone(5, TimeUnit.SECONDS)
              .assertResult(n * (n + 1) / 2);
          }
      }
  
      @Test
      public void asyncSumLong() {
          long n = 1_000_000;
          Flowable.rangeLong(1, n)
          .parallel()
          .runOn(Schedulers.computation())
          .collect(Collectors.summingLong(v -> v))
          .test()
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult(n * (n + 1) / 2);
      }
  }
  