Java ForkJoinPool getAsyncMode() Method

The getAsyncMode() method is used to check if the pool uses First-in-First-out scheduling for forked tasks that are never joined. If yes, then it returns true otherwise false.

Syntax:

Parameter:

Task - the task to execute.

Returns:

true if this pool uses async mode

Throws:

Does not throw the exception.

Example 1

            import java.util.concurrent.ForkJoinPool;
	import java.util.concurrent.RecursiveTask;
        public class JavaForkJoingetAsyncModeExample1 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) {
	      JavaForkJoingetAsyncModeExample1 left = new JavaForkJoingetAsyncModeExample1();
             JavaForkJoingetAsyncModeExample1 right = new JavaForkJoingetAsyncModeExample1();
             JavaForkJoingetAsyncModeExample1 finder = new JavaForkJoingetAsyncModeExample1();
             ForkJoinPool pool = ForkJoinPool.commonPool();
           pool.submit(left); pool.submit(right); pool.submit(finder);
	    System.out.println("Finder :" + pool.invoke(finder) + "    Active threads :" +pool.getActiveThreadCount() + " Left  " +pool.invoke(left) + " Right "+ pool.invoke(right) );
           System.out.println("Is pool use First-in-First-out Scheduling:" +pool.getAsyncMode());
	  }
        }

Test it Now

Output:

Finder :0    Active threads :3 Left  0 Right 0
Is pool use First-in-First-out Scheduling: false

Example 2

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.RecursiveAction;
 class Task11 extends RecursiveAction {
     private long Load = 0;
 public Task11(long Load) {
         this.Load = Load;
    }
    @Override
    protected void compute() {
        //if work is above threshold, break tasks up into smaller tasks
            List<Task11> subtasks = new ArrayList<Task11>();
                subtasks.addAll(createSubtasks());
            for(RecursiveAction subtask : subtasks){
                subtask.fork();
            }
    }
    private List<Task11> createSubtasks() {
        List<Task11> subtasks =new ArrayList<Task11>();
     Task11 subtask1 = new Task11(this.Load / 2);
        subtasks.add(subtask1);
        return subtasks;
    }
}
public class JavaForkJoingetAsyncModeExample2 {
   public static void main(final String[] arguments) throws InterruptedException
      {      
      ForkJoinPool Pool = ForkJoinPool.commonPool();
      int i= Pool.getPoolSize();
      System.out.println("Common Pool Size before  :" +i);
       Task11 t = new Task11(1000);
       Pool.invoke(t);
       Pool.execute(t);
      System.out.println("Common Pool Size after  :" +Pool.getPoolSize());
       System.out.println("Is pool use First-in-First-out Sheduling:" +Pool.getAsyncMode());
   }  
}

Test it Now

Output:

Common Pool Size before  :0
Common Pool Size after  :3
Is pool use First-in-First-out Scheduling: false

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