Java ForkJoinPool isTerminated() Method

The isTerminated() method of ForkJoinPool class returns true if all the tasks in the pool have been shut down.

Syntax

Parameter

No parameter is passed.

Returns

True if all tasks have completed following shut down

Throws

Does not throw the exception.

Example 1

import java.util.concurrent.ForkJoinPool;
import static java.util.concurrent.ForkJoinTask.invokeAll;
import java.util.concurrent.RecursiveTask;
import java.util.concurrent.TimeUnit;
public class JavaForkJoinPoolisTerminationExample1  {
   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);
      int[] n = {20 , 23 , 5 ,6 ,7,8,23,12,56,1}; 
      ForkJoinPool Pool = new ForkJoinPool(proc);
      Testl t=new Testl(n,0,n.length);
      System.out.println("   Before awaitTermination (is terminated):" +Pool.isTerminated() );
      System.out.println("  is awaitQuiescent :" + Pool.awaitQuiescence(2, 	TimeUnit.SECONDS) );
     Pool.awaitTermination(3, TimeUnit.SECONDS);
     System.out.println("   After awaitTermination (is terminated):" +Pool.isTerminated() );
      Integer r = Pool.invoke(t);
      System.out.println("Pool.invoke :" +r);
     }  
}
 class Testl extends RecursiveTask<Integer> {
      int st;
      int end;
      int[] arr;
      Testl(int[] arr, int st, int end) {
         this.arr = arr;
         this.st  = st;
         this.end  = end;
      }
      protected Integer compute() {
                  if(st - end <= 10) {
            int sum = 0;
               for(int i = st; i < end; ++i) 
               sum += arr[i];
              return sum;
         } else {	    	
            int mid = st + (end - st) / 2;
            Testl t1 = new Testl(arr, st, mid);
            Testl t2 = new Testl(arr, st, mid);
            invokeAll(t1 , t2);
             return (t1.join() + t2.join());
         }
      }
   }

Test it Now

Output:

numbers of core available in your processor:2
   Before awaitTermination (is terminated):false
  is awaitQuiescent :true
   After awaitTermination (is terminated):false
Pool.invoke :161

Example 2

import java.util.concurrent.ForkJoinPool;
import static java.util.concurrent.ForkJoinTask.invokeAll;
import java.util.concurrent.RecursiveTask;
import java.util.concurrent.TimeUnit;
public class JavaForkJoinPoolisTerminationExample2 {
   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 = new ForkJoinPool(proc);
      Testk t=new Testk();
      Pool.awaitTermination(2, TimeUnit.SECONDS);
      System.out.println("  is terminated :" +Pool.isTerminated() );
   }  
}
class Testk extends RecursiveTask<Integer> {
    @Override
      protected Integer compute() {
            Testk t1 = new Testk();
            Testk t2 = new Testk();
            invokeAll(t1 , t2);
            return (t1.join() + t2.join());
         }
      }

Test it Now

Output:

numbers of core available in your processor:4
  is terminated :false

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