`

Concurrent - Phaser - arriveAndAwaitAdvance() & arriveAndDeregister()

 
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原创转载请注明出处：http://agilestyle.iteye.com/blog/2344591

 

Phaser提供了动态增减parties计数，这点比CyclicBarrier类操作parties更加方便，通过若干个方法来控制多个线程之间同步运行的结果，还可以实现针对某一个线程取消同步运行的效果，而且支持屏障处等待，在等待时还支持中断或非中断等功能，使用Java并发类对线程进行分组同步控制时，Phaser比CyclicBarrier功能更加强大，推荐使用。

 

arriveAndAwaitAdvance()

arriveAndAwaitAdvance()作用是当前线程已经到达屏障，在此等待一段时间，等条件满足后继续向下一个屏障继续执行


PhaserTest1.java

package org.fool.java.concurrent.phaser;

import java.util.concurrent.Phaser;

public class PhaserTest1 {
    public static class Service {
        private Phaser phaser;

        public Service(Phaser phaser) {
            this.phaser = phaser;
        }

        public void testMethodA() {
            System.out.println(Thread.currentThread().getName() + " A1 begin " + System.currentTimeMillis());

            phaser.arriveAndAwaitAdvance();

            System.out.println(Thread.currentThread().getName() + " A1 end " + System.currentTimeMillis());

            System.out.println(Thread.currentThread().getName() + " A2 begin " + System.currentTimeMillis());

            phaser.arriveAndAwaitAdvance();

            System.out.println(Thread.currentThread().getName() + " A2 end " + System.currentTimeMillis());
        }

        public void testMethodB() {
            try {
                System.out.println(Thread.currentThread().getName() + " B1 begin " + System.currentTimeMillis());
                Thread.sleep(5000);
                phaser.arriveAndAwaitAdvance();

                System.out.println(Thread.currentThread().getName() + " B1 end " + System.currentTimeMillis());

                System.out.println(Thread.currentThread().getName() + " B2 begin " + System.currentTimeMillis());
                Thread.sleep(5000);
                phaser.arriveAndAwaitAdvance();

                System.out.println(Thread.currentThread().getName() + " B2 end " + System.currentTimeMillis());
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    public static class ThreadA implements Runnable {

        private Service service;

        public ThreadA(Service service) {
            this.service = service;
        }

        @Override
        public void run() {
            service.testMethodA();
        }
    }

    public static class ThreadB implements Runnable {

        private Service service;

        public ThreadB(Service service) {
            this.service = service;
        }

        @Override
        public void run() {
            service.testMethodA();
        }
    }

    public static class ThreadC implements Runnable {

        private Service service;

        public ThreadC(Service service) {
            this.service = service;
        }

        @Override
        public void run() {
            service.testMethodB();
        }
    }

    public static void main(String[] args) {
        Phaser phaser = new Phaser(3);

        Service service = new Service(phaser);

        Thread t1 = new Thread(new ThreadA(service));
        t1.setName("Thread-A");
        t1.start();

        Thread t2 = new Thread(new ThreadB(service));
        t2.setName("Thread-B");
        t2.start();

        Thread t3 = new Thread(new ThreadC(service));
        t3.setName("Thread-C");
        t3.start();
    }
}

Run


 

PhaserTest2.java

package org.fool.java.concurrent.phaser;

import java.util.concurrent.Phaser;

public class PhaserTest2 {
    public static class Service {
        private Phaser phaser;

        public Service(Phaser phaser) {
            this.phaser = phaser;
        }

        public void testMethodA() {
            System.out.println(Thread.currentThread().getName() + " A1 begin " + System.currentTimeMillis());

            phaser.arriveAndAwaitAdvance();

            System.out.println(Thread.currentThread().getName() + " A1 end " + System.currentTimeMillis());

            System.out.println(Thread.currentThread().getName() + " A2 begin " + System.currentTimeMillis());

            phaser.arriveAndAwaitAdvance();

            System.out.println(Thread.currentThread().getName() + " A2 end " + System.currentTimeMillis());
        }

        public void testMethodB() {
            try {
                System.out.println(Thread.currentThread().getName() + " B1 begin " + System.currentTimeMillis());
                Thread.sleep(5000);
                phaser.arriveAndAwaitAdvance();

                System.out.println(Thread.currentThread().getName() + " B1 end " + System.currentTimeMillis());
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    public static class ThreadA implements Runnable {

        private Service service;

        public ThreadA(Service service) {
            this.service = service;
        }

        @Override
        public void run() {
            service.testMethodA();
        }
    }

    public static class ThreadB implements Runnable {

        private Service service;

        public ThreadB(Service service) {
            this.service = service;
        }

        @Override
        public void run() {
            service.testMethodA();
        }
    }

    public static class ThreadC implements Runnable {

        private Service service;

        public ThreadC(Service service) {
            this.service = service;
        }

        @Override
        public void run() {
            service.testMethodB();
        }
    }

    public static void main(String[] args) {
        Phaser phaser = new Phaser(3);

        Service service = new Service(phaser);

        Thread t1 = new Thread(new ThreadA(service));
        t1.setName("Thread-A");
        t1.start();

        Thread t2 = new Thread(new ThreadB(service));
        t2.setName("Thread-B");
        t2.start();

        Thread t3 = new Thread(new ThreadC(service));
        t3.setName("Thread-C");
        t3.start();
    }
}

Run


Note:

从运行结果来看，当计数不足时，线程呈阻塞状态，不继续向下运行，因为线程C仅仅执行了一次arriveAndAwaitAdvance()方法导致了这样的结果，所以当出现这样无法继续向下一个屏障继续执行的情况，需要使用arriveAndDeregister()

 

arriveAndDeregister()

arriveAndDeregister()作用是使当前线程退出，并且使parties值减1。

PhaserTest3.java

package org.fool.java.concurrent.phaser;

import java.util.concurrent.Phaser;

public class PhaserTest3 {
    public static class Service {
        private Phaser phaser;

        public Service(Phaser phaser) {
            this.phaser = phaser;
        }

        public void testMethodA() {
            System.out.println(Thread.currentThread().getName() + " A1 begin " + System.currentTimeMillis());

            phaser.arriveAndAwaitAdvance();

            System.out.println(Thread.currentThread().getName() + " A1 end " + System.currentTimeMillis());

            System.out.println(Thread.currentThread().getName() + " A2 begin " + System.currentTimeMillis());

            phaser.arriveAndAwaitAdvance();

            System.out.println(Thread.currentThread().getName() + " A2 end " + System.currentTimeMillis());
        }

        public void testMethodB() {
            try {
                System.out.println(Thread.currentThread().getName() + " B1 begin " + System.currentTimeMillis());
                Thread.sleep(5000);

                System.out.println("before arriveAndDeregister(): " + phaser.getRegisteredParties());
                phaser.arriveAndDeregister();
                System.out.println("after arriveAndDeregister(): " + phaser.getRegisteredParties());

                System.out.println(Thread.currentThread().getName() + " B1 end " + System.currentTimeMillis());
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    public static class ThreadA implements Runnable {

        private Service service;

        public ThreadA(Service service) {
            this.service = service;
        }

        @Override
        public void run() {
            service.testMethodA();
        }
    }

    public static class ThreadB implements Runnable {

        private Service service;

        public ThreadB(Service service) {
            this.service = service;
        }

        @Override
        public void run() {
            service.testMethodA();
        }
    }

    public static class ThreadC implements Runnable {

        private Service service;

        public ThreadC(Service service) {
            this.service = service;
        }

        @Override
        public void run() {
            service.testMethodB();
        }
    }

    public static void main(String[] args) {
        Phaser phaser = new Phaser(3);

        Service service = new Service(phaser);

        Thread t1 = new Thread(new ThreadA(service));
        t1.setName("Thread-A");
        t1.start();

        Thread t2 = new Thread(new ThreadB(service));
        t2.setName("Thread-B");
        t2.start();

        Thread t3 = new Thread(new ThreadC(service));
        t3.setName("Thread-C");
        t3.start();
    }
}

Run


 

Reference

Java并发编程核心方法与框架 

 

 

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