Java Phaser getUnarrivedParties() Method

The getUnarrivedParties() Method is of Phaser Class. It returns the number of registered parties that have not yet arrived at the current phase of this phaser.

Syntax

Return

It returns the number of unarrived parties.

Example 1

import java.util.concurrent.Phaser;
public class getUnarrivedParties1
{
    public static void main(String[] args) throws InterruptedException
    {
        int i, j;
          Phaser p = new Phaser();
          p.register();
          int pc = p.getPhase();
          System.out.println("Phasecount is "+pc);
          for(i=0;i<=5;i++)
          {
          new getUnarrivedParties1().testPhaser(p);
          }
          System.out.println("Unarrived Parties : "+p.getUnarrivedParties());
          Thread.sleep(5000);
          pc = p.getPhase();
          System.out.println("Phasecount is "+pc);
           
    }
    private void testPhaser(final Phaser phaser)
    {
        new Thread(){
                @Override
                public void run()
                    {
                        System.out.println(Thread.currentThread().getName()+" arrived");
                       
                    }
               }.start();
    }
}

Test it Now

Output:

Phasecount is 0
Thread-0 arrived
Thread-1 arrived
Thread-2 arrived
Thread-3 arrived
Unarrived Parties : 1
Thread-4 arrived
Thread-5 arrived
Phasecount is 0

Example 2

import java.util.concurrent.Phaser;
public class getUnarrivedParties2
{
    public static void main(String[] args) throws InterruptedException
    {
        int i, j;
          Phaser p = new Phaser();
          p.register();
          int pc = p.getPhase();
          System.out.println("Phasecount is "+pc);
          new getUnarrivedParties1().testPhaser(p);
          new getUnarrivedParties1().testPhaser(p);
          System.out.println("Unarrived Parties : "+p.getUnarrivedParties());
          Thread.sleep(5000);
          pc = p.getPhase();
          System.out.println("Phasecount is "+pc);
           
    }
    private void testPhaser(final Phaser phaser)
    {
        new Thread(){
                @Override
                public void run()
                    {
                        System.out.println(Thread.currentThread().getName()+" arrived");
                       
                    }
               }.start();
    }
}

Test it Now

Output:

Phasecount is 0
Thread-0 arrived
Unarrived Parties : 1
Thread-1 arrived
Phasecount is 0

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