Java Executor newWorkStealingPool() Method

The newWorkStealingPool() method of Executors class creates a work-stealing thread pool using the number of available processors as its target parallelism level.

Syntax

public static ExecutorService newWorkStealingPool()
public static ExecutorService newWorkStealingPool(int parallelism)

Parameter

parallelism - the targeted parallelism level

Returns

the newly created thread pool

Throw

IllegalArgumentException

Example 1

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

public class ExecutorsnewWorkStealingPoolExample1  {
	
   public static void main(final String[] arguments) throws InterruptedException {
      ExecutorService excr = Executors.newWorkStealingPool();
      ThreadPoolExecutor mypool = (ThreadPoolExecutor)  Executors.newCachedThreadPool();;
      System.out.println("size of mypool: " + mypool.getPoolSize());
      excr.submit(new Threadimpl());
      excr.submit(new Threadimpl());
      System.out.println("Total number threads scheduled): "+ mypool.getTaskCount());
      excr.shutdown();
   }  

   static class Threadimpl implements Runnable {

      public void run() {
         
         try {
            Long num = (long) (Math.random() / 30);
            System.out.println("Thread Name: " +Thread.currentThread().getName());
               TimeUnit.SECONDS.sleep(num);
            System.out.println("after sleep Thread Name: " +Thread.currentThread().getName());
         } catch (InterruptedException e) {
            e.printStackTrace();
         }
      }
   }
}

Test it Now

Output:

size of mypool: 0
Thread Name: ForkJoinPool-1-worker-5
after sleep Thread Name: ForkJoinPool-1-worker-5
Thread Name: ForkJoinPool-1-worker-3
after sleep Thread Name: ForkJoinPool-1-worker-3
Total number threads scheduled): 0

Example 1

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

public class ExecutorsnewWorkStealingPoolExample2  {
	
   public static void main(final String[] arguments) throws InterruptedException {
      ExecutorService excr = Executors.newWorkStealingPool(4);
      ThreadPoolExecutor mypool = (ThreadPoolExecutor)  Executors.newCachedThreadPool();;
      System.out.println("size of mypool: " + mypool.getPoolSize());
      excr.submit(new Threadimpl());
      excr.submit(new Threadimpl());
      System.out.println("Total number threads scheduled): "+ mypool.getTaskCount());
      excr.shutdown();
   }  

   static class Threadimpl implements Runnable {

      public void run() {
         
         try {
            Long num = (long) (Math.random() / 30);
            System.out.println("Thread Name: " +Thread.currentThread().getName());
               TimeUnit.SECONDS.sleep(num);
            System.out.println("after sleep Thread Name: " +Thread.currentThread().getName());
         } catch (InterruptedException e) {
            e.printStackTrace();
         }
      }
   }
}

Test it Now

Output:

size of mypool: 0
Thread Name: ForkJoinPool-1-worker-5
after sleep Thread Name: ForkJoinPool-1-worker-5
Thread Name: ForkJoinPool-1-worker-3
after sleep Thread Name: ForkJoinPool-1-worker-3
Total number threads scheduled): 0

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