Java ForkJoinPool isShutdown() Method

The isShutdown() method of ForkJoinPool class returns true if the pool calling isShutdown() has been shut down.

Syntax

Parameter

No parameter is passed.

Returns

True if this pool has been shut down

Throws

Does not throw the exception.

Example 1

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.RecursiveAction;
  class Taask extends RecursiveAction {
     private long Load = 0;
  public Taask(long Load) {
         this.Load = Load;
    }
    @Override
    protected void compute() {
        //if work is above threshold, break tasks up into smaller tasks
            List<Taask> subtasks = new ArrayList<Taask>();
                    subtasks.addAll(createSubtasks());
            for(RecursiveAction subtask : subtasks){
                subtask.fork();
            } 
    }
    private List<Taask> createSubtasks() {
        List<Taask> subtasks =new ArrayList<Taask>();
    Taask subtask1 = new Taask(this.Load / 2);
     Taask subtask2 = new Taask(this.Load / 2);
      Taask subtask3 = new Taask(this.Load / 2);
        subtasks.add(subtask1);
        subtasks.add(subtask2);
        subtasks.add(subtask3);
        return subtasks;
    }
}
public class JavaForkJoinisShutdownExample1  {
public static void main(final String[] arguments) throws InterruptedException
      {      
      int proc = Runtime.getRuntime().availableProcessors();
      System.out.println("numbers of core available in your processor:"  +proc);
      ForkJoinPool Pool = ForkJoinPool.commonPool();
      System.out.println(" Before invoking number of active thread   :" +Pool.getActiveThreadCount());
       Taask t = new Taask(400);
       Pool.invoke(t); 
      System.out.println(" is Shutdown  :" +Pool.isShutdown());
      System.out.println("Common Pool Size   :" +Pool.getPoolSize());
   }  
}

Test it Now

Output:

numbers of core available in your processor:4
 Before invoking number of active thread   :0
 is Shutdown  :false
Common Pool Size   :3

Example 2

import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.RecursiveTask;
        public class JavaForkJoinisShutdownExample2 extends RecursiveTask<Integer> {
             @Override
              protected Integer compute() {
                  try{
                       throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
                  }
                  catch(Exception e)
                  { 
                  }
                  return 0;
               }
               public static void main(String[] args) {
	      JavaForkJoinisShutdownExample2 left = new JavaForkJoinisShutdownExample2();
             JavaForkJoinisShutdownExample2 right = new JavaForkJoinisShutdownExample2();
             JavaForkJoinisShutdownExample2 finder = new JavaForkJoinisShutdownExample2();
             ForkJoinPool pool = ForkJoinPool.commonPool();
           pool.submit(left); pool.submit(right); pool.submit(finder);
          	    System.out.println(" || Finder :" + pool.invoke(finder) + " || is Shutdown " +pool.isShutdown()   + " || Active threads :" +pool.getActiveThreadCount() + " Left  " +pool.invoke(left) + " Right "+ pool.invoke(right) );
               }
        }

Test it Now

Output:

|| Finder :0 || is Shutdown false || Active threads :2 Left  0 Right 0

Next TopicJava ForkJoinPool

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