BAEL-4876: Parallel stream examples added
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</build>
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<properties>
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<lombok.version>1.18.20</lombok.version>
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<!-- testing -->
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<assertj.version>3.6.1</assertj.version>
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</properties>
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package com.baeldung.streams.parallel;
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import java.util.List;
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public class ParallelStream {
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public static void main(String[] args) {
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List<Integer> listOfNumbers = List.of(1, 2, 3, 4);
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listOfNumbers.parallelStream().forEach(number ->
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System.out.println(number + " " + Thread.currentThread().getName())
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);
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}
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}
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package com.baeldung.streams.parallel;
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import java.util.List;
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public class SequentialStream {
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public static void main(String[] args) {
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List<Integer> listOfNumbers = List.of(1, 2, 3, 4);
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listOfNumbers.stream().forEach(number ->
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System.out.println(number + " " + Thread.currentThread().getName())
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);
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}
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}
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package com.baeldung.streams.parallel;
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import org.junit.jupiter.api.Test;
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import java.util.List;
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import java.util.concurrent.ExecutionException;
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import java.util.concurrent.ForkJoinPool;
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import static org.assertj.core.api.Assertions.assertThat;
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class ForkJoinUnitTest {
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@Test
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void givenSequentialStreamOfNumbers_whenReducingSumWithIdentityFive_thenResultIsCorrect() {
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List<Integer> listOfNumbers = List.of(1, 2, 3, 4);
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int sum = listOfNumbers.stream().reduce(5, Integer::sum);
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assertThat(sum).isEqualTo(15);
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}
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@Test
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void givenParallelStreamOfNumbers_whenReducingSumWithIdentityFive_thenResultIsNotCorrect() {
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List<Integer> listOfNumbers = List.of(1, 2, 3, 4);
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int sum = listOfNumbers.parallelStream().reduce(5, Integer::sum);
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assertThat(sum).isNotEqualTo(15);
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}
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@Test
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void givenParallelStreamOfNumbers_whenReducingSumWithIdentityZero_thenResultIsCorrect() {
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List<Integer> listOfNumbers = List.of(1, 2, 3, 4);
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int sum = listOfNumbers.parallelStream().reduce(0, Integer::sum) + 5;
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assertThat(sum).isEqualTo(15);
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}
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@Test
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public void givenParallelStreamOfNumbers_whenUsingCustomThreadPool_thenResultIsCorrect()
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throws InterruptedException, ExecutionException {
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List<Integer> listOfNumbers = List.of(1, 2, 3, 4);
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ForkJoinPool customThreadPool = new ForkJoinPool(4);
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int sum = customThreadPool.submit(
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() -> listOfNumbers.parallelStream().reduce(0, Integer::sum)).get();
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customThreadPool.shutdown();
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assertThat(sum).isEqualTo(10);
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}
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}
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