Java Forkjoinpool awaitTermination() Method

The awaitTermination() method of ForkJoinPool class is used to await the termination after the shutdown request or the timeout specified as the parameter. The timeout elapses until the program shut down. When It is called with common-pool, It acts as the awaitQuiescence() method. It returns true if executor terminate and false if the time specified as timeout elapses.

Syntax:

public boolean awaitTermination(long timeout, TimeUnit unit) throws   InterruptedException

Parameter:

timeout - the time to wait

unit - the time unit of the timeout argument this can be HOUR, SECONDS, DAY, etc.

Returns:

True if this executor terminated and false if the timeout elapsed before termination

Throws

InterruptedException

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 JavaForkJoinPoolawaitTerminationExample1 {
   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);
      Test2 t=new Test2(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 Test2 extends RecursiveTask<Integer> {
      int st;
      int end;
      int[] arr;
      Test2(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;
            Test2 t1 = new Test2(arr, st, mid);
            Test2 t2 = new Test2(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 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 JavaForkJoinPoolawaitTerminationExample2 {
   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);
      Test1 t=new Test1();
      Pool.awaitTermination(2, TimeUnit.SECONDS);
      System.out.println("  is terminated :" +Pool.isTerminated() );
   }  
}
class Test1 extends RecursiveTask<Integer> {
    @Override
      protected Integer compute() {
            Test1 t1 = new Test1();
            Test1 t2 = new Test1();
            invokeAll(t1 , t2);
            return (t1.join() + t2.join());
         }
      }

Test it Now

Output:

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

Next TopicForkjoinpool awaitQuiescence()

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