Java Phaser getParent() Method

The getParent() method of Phaser class is used to get the parent of the current phaser. It returns null there is no parent of the current phaser.

Syntax:

Return:

it returns the parent of current phaser

Example 1

import java.util.concurrent.Phaser;
public class JavaPhaserGetParentExample1
{
    public static void main(String[] args) throws InterruptedException
    { 
         Phaser p = new Phaser(10);
         p.register();
         Phaser pc = p.getParent();
          System.out.println("Thread is sleeping");
          Thread.sleep(5000);
            new JavaPhaserGetParentExample1().test(p);
    }
    void test(final Phaser p)
    {
        new Thread(){
                @Override
                public void run()
                    {
                        System.out.println(Thread.currentThread().getName()+" arrived" );
                       p.arrive();
                      System.out.println("Parent Phaser: "+p);
                    }
               }.start();
    }
}

Test it Now

Output:

Thread is sleeping
Thread-0 arrived
Parent Phaser: java.util.concurrent.Phaser@2b71e323[phase = 0 parties = 11 arrived = 1]

Example 2

import java.util.concurrent.Phaser;
public class JavaPhaserGetParentExample2
{
    public static void main(String[] args) throws InterruptedException
    {
          Phaser p = new Phaser(10);
          p.register();
         Phaser pc = p.getParent();
         for(int i=0; i<=5; i++)
          {  
            new JavaPhaserGetParentExample2().test(p);
        } 
   }
    void test(final Phaser p)
    {
        new Thread(){
                @Override
                public void run()
                    {
                       System.out.println(Thread.currentThread().getName()+" arrived" );
                       p.arrive();
                       System.out.println("Parent Phaser: "+p);
                    }
               }.start();	
    }
}

Test it Now

Output:

Thread-1 arrived
Parent Phaser: java.util.concurrent.Phaser@2eaa3bae[phase = 0 parties = 11 arrived = 1]
Thread-4 arrived
Thread-3 arrived
Parent Phaser: java.util.concurrent.Phaser@2eaa3bae[phase = 0 parties = 11 arrived = 3]
Thread-0 arrived
Thread-2 arrived
Parent Phaser: java.util.concurrent.Phaser@2eaa3bae[phase = 0 parties = 11 arrived = 5]
Parent Phaser: java.util.concurrent.Phaser@2eaa3bae[phase = 0 parties = 11 arrived = 4]
Thread-5 arrived
Parent Phaser: java.util.concurrent.Phaser@2eaa3bae[phase = 0 parties = 11 arrived = 2]
Parent Phaser: java.util.concurrent.Phaser@2eaa3bae[phase = 0 parties = 11 arrived = 6]

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