Java Phaser arrive() Method

The arrive() method of Phaser class is used to notify the arrival of the current phaser, without waiting for the other phasers to arrive.

Syntax:

Return:

It returns arrival of the current phaser number.

Throws:

IllegalStateException - this Exception is thrown when the number of unarrived parties is negative.

Example 1

import java.util.concurrent.Phaser;
public class JavaPhaserArriveExample1
{	
    public static void main(String[] args) throws InterruptedException
    {	
          Phaser p = new Phaser(10);
          p.register();
         int pc = p.getPhase();
          System.out.println("Thread is sleeping");
          Thread.sleep(5000);
          for(int i=0; i<=5; i++)
          {
           new JavaPhaserArriveExample1().test1(p);
           p.arrive();
          }
          System.out.println("Final Phase count after arrival of Thread is "+pc);   
    }
    void test1(final Phaser p)
    {
        new Thread(){
                @Override
                public void run()
                    {
                        try{ 
                        System.out.println(Thread.currentThread().getName()+" arrived");
                        }catch(Exception e){};
                    }

               }.start();
    }
}

Test it Now

Output:

Thread is sleeping
Thread-0 arrived
Thread-2 arrived
Thread-1 arrived
Thread-3 arrived
Thread-4 arrived
Thread-5 arrived
Final Phase count after arrival of Thread is 0

Example 2

import java.util.concurrent.Phaser;
public class JavaPhaserArriveExample2
{
	public static void main(String[] args) throws InterruptedException
    {
          Phaser p = new Phaser(10);
          p.register();
         int pc = p.getPhase();
          System.out.println("Thread is sleeping");
          Thread.sleep(5000);
           new JavaPhaserArriveExample2().test1(p);
           p.arrive();
           new JavaPhaserArriveExample2().test1(p);
           p.arrive();
         
          System.out.println("Final Phase count after arrival of Thread is "+pc);   
    }
    void test1(final Phaser p)
    {
        new Thread(){
                @Override
                public void run()
                    {
                        try{
                             
                        System.out.println(Thread.currentThread().getName()+" arrived");
                        }catch(Exception e){};
                    }

               }.start();
    }
}

Test it Now

Output:

Thread is sleeping
Final Phase count after arrival of Thread is 0
Thread-1 arrived
Thread-0 arrived

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