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What is fork join pool?

Pragya Keshap answered on February 22, 2023 Popularity 6/10 Helpfulness 1/10

answer What is fork join pool?

What is fork join pool?

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It is an implementation of the ExecutorService that manages worker threads and provides us with tools to get information about the thread pool state and performance. Worker threads can execute only one task at a time, but the ForkJoinPool doesn't create a separate thread for every single subtask.

public class CustomRecursiveTask extends RecursiveTask<Integer> {
    private int[] arr;

    private static final int THRESHOLD = 20;

    public CustomRecursiveTask(int[] arr) {
        this.arr = arr;
    }

    @Override
    protected Integer compute() {
        if (arr.length > THRESHOLD) {
            return ForkJoinTask.invokeAll(createSubtasks())
              .stream()
              .mapToInt(ForkJoinTask::join)
              .sum();
        } else {
            return processing(arr);
        }
    }

    private Collection<CustomRecursiveTask> createSubtasks() {
        List<CustomRecursiveTask> dividedTasks = new ArrayList<>();
        dividedTasks.add(new CustomRecursiveTask(
          Arrays.copyOfRange(arr, 0, arr.length / 2)));
        dividedTasks.add(new CustomRecursiveTask(
          Arrays.copyOfRange(arr, arr.length / 2, arr.length)));
        return dividedTasks;
    }

    private Integer processing(int[] arr) {
        return Arrays.stream(arr)
          .filter(a -> a > 10 && a < 27)
          .map(a -> a * 10)
          .sum();
    }
}

https://www.baeldung.com/java-fork-join#:~:text=ForkJoinPool,-The%20ForkJoinPool%20is&text=It%20is%20an%20implementation%20of,thread%20for%20every%20single%20subtask.

Popularity 6/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: fork-join java

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Contributed on Feb 22 2023

Pragya Keshap

0 Answers Avg Quality 2/10

What is fork join pool?

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