isTerminating() Method

The isTerminating() method of ForkJoinPool class returns true if the process of termination has started but not yet completed. This method is useful for debugging.

Syntax

Parameter

No parameter is passed.

Returns

True if terminating but not yet ended.

Throw

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 JavaForkJoinPoolisTerminatingExample1   {
   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);
      Testl1 t=new Testl1(n,0,n.length);
      System.out.println("   Before awaitTermination (is terminating):" +Pool.isTerminating() );
      System.out.println("  is awaitQuiescent :" + Pool.awaitQuiescence(2, TimeUnit.SECONDS) );
     Pool.awaitTermination(3, TimeUnit.SECONDS);
     System.out.println("   After awaitTermination (is terminating):" +Pool.isTerminating() );
      Integer r = Pool.invoke(t);
      System.out.println("Pool.invoke :" +r);
   }  
}
   class Testl1 extends RecursiveTask<Integer> {
      int st;
      int end;
      int[] arr;

      Testl1(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;
            Testl1 t1 = new Testl1(arr, st, mid);
            Testl1 t2 = new Testl1(arr, st, mid);
            invokeAll(t1 , t2);
            return (t1.join() + t2.join());
         }
      }
   }

Test it Now

Output:

numbers of core available in your processor:4
   Before awaitTermination (is terminating):false
  is awaitQuiescent :true
   After awaitTermination (is terminating):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 JavaForkJoinPoolisTerminatingExample2  {
   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);
      Testb t=new Testb();
      Pool.awaitTermination(2, TimeUnit.SECONDS);
      System.out.println("  is terminating :" +Pool.isTerminating() );
   }  
}
class Testb extends RecursiveTask<Integer> {
    @Override
      protected Integer compute() {
            Testb t1 = new Testb();
            Testb t2 = new Testb();
            invokeAll(t1 , t2);
            return (t1.join() + t2.join());
         }
      }

Test it Now

Output:

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

Next TopicJava ForkJoinPool

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