Java Phaser bulkRegister() Method

The bulkRegister() method is of Phaser class. This method Adds the given number of new unarrived parties to this phaser.

Syntax

Parameters

parties - It is the number of parties to add in advance to the next phase.

Return

It returns the number of arrival phase to which this registration applied.

Throws

IllegalStateException - It throws exception if tried to register more than the maximum number of parties.

IllegalArgumentException - It throws exception if parties less than 0.

Example 1

import java.util.concurrent.Phaser;
public class PhaserBulkRegisterExample1
{
    public static void main(String[] args) throws InterruptedException
    {
          Phaser p = new Phaser();
          p.register();
          int pc = p.getPhase();
          System.out.println("Phasecount is "+pc);
          
          for(int i=1; i<=5; i++)
          {
            new PhaserBulkRegisterExample1().test(p);
            System.out.println("Unarrived parties to current phaser : "+p.bulkRegister(2));
          } 
          Thread.sleep(5000);
          pc = p.getPhase();
          System.out.println("Phasecount is "+pc);
    }
    private void test(final Phaser phaser)
    {
        new Thread(){
                @Override
                public void run()
                    {
                        try{ 
                        System.out.println(Thread.currentThread().getName()+" arrived");
                       
                        }
                        catch(IllegalArgumentException e) 
                        {}
                    }
               }.start();
    }
}

Test it Now

Output:

Phasecount is 0
Unarrived parties to current phaser : 0
Thread-0 arrived
Unarrived parties to current phaser : 0
Thread-1 arrived
Thread-2 arrived
Unarrived parties to current phaser : 0
Unarrived parties to current phaser : 0
Unarrived parties to current phaser : 0
Thread-4 arrived
Thread-3 arrived
Phasecount is 0

Example 2

import java.util.concurrent.Phaser;
public class PhaserBulkRegisterExample2
{
    public static void main(String[] args) throws InterruptedException
    {
          Phaser p = new Phaser();
          p.register();
          int pc = p.getPhase();
          System.out.println("Phasecount is "+pc); 
            new PhaserBulkRegisterExample2().test(p);
               System.out.println("Unarrived parties to current phaser : "+p.bulkRegister(0));
             new PhaserBulkRegisterExample2().test(p);
                System.out.println("Unarrived parties to current phaser : "+p.bulkRegister(1));
             
          Thread.sleep(5000);
          pc = p.getPhase();
          System.out.println("Phasecount is "+pc);
    }
    private void test(final Phaser phaser)
    {
        new Thread(){
                @Override
                public void run()
                    {
                        try{ 
                        System.out.println(Thread.currentThread().getName()+" arrived"); 
                        }
                        catch(IllegalArgumentException e) 
                        {}
                    }
               }.start();
    }
}

Test it Now

Output:

Phasecount is 0
Unarrived parties to current phaser : 0
Unarrived parties to current phaser : 0
Thread-0 arrived
Thread-1 arrived
Phasecount is 0

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