原创转载请注明出处:http://agilestyle.iteye.com/blog/2344661
awaitAdvance(int phase)
awaitAdvance(int phase)作用是如果传入参数phase值和当前getPhase()返回值一样,则在屏障处等待,否则立刻返回执行下面的代码
PhaserTest11.java
package org.fool.java.concurrent.phaser; import java.util.concurrent.Phaser; public class PhaserTest11 { public static class ThreadA implements Runnable { private Phaser phaser; public ThreadA(Phaser phaser) { this.phaser = phaser; } @Override public void run() { System.out.println(Thread.currentThread().getName() + " A1 begin " + System.currentTimeMillis()); phaser.arriveAndAwaitAdvance(); System.out.println(Thread.currentThread().getName() + " A1 end " + System.currentTimeMillis()); } } public static class ThreadB implements Runnable { private Phaser phaser; public ThreadB(Phaser phaser) { this.phaser = phaser; } @Override public void run() { System.out.println(Thread.currentThread().getName() + " A1 begin " + System.currentTimeMillis()); phaser.arriveAndAwaitAdvance(); System.out.println(Thread.currentThread().getName() + " A1 end " + System.currentTimeMillis()); } } public static class ThreadC implements Runnable { private Phaser phaser; public ThreadC(Phaser phaser) { this.phaser = phaser; } @Override public void run() { try { System.out.println(Thread.currentThread().getName() + " A1 begin " + System.currentTimeMillis()); Thread.sleep(3000); System.out.println("phaser.getPhase()=" + phaser.getPhase()); phaser.awaitAdvance(0); System.out.println(Thread.currentThread().getName() + " A1 end " + System.currentTimeMillis()); } catch (InterruptedException e) { e.printStackTrace(); } } } public static class ThreadD implements Runnable { private Phaser phaser; public ThreadD(Phaser phaser) { this.phaser = phaser; } @Override public void run() { try { System.out.println(Thread.currentThread().getName() + " A1 begin " + System.currentTimeMillis()); Thread.sleep(5000); phaser.arriveAndAwaitAdvance(); System.out.println(Thread.currentThread().getName() + " A1 end " + System.currentTimeMillis()); } catch (InterruptedException e) { e.printStackTrace(); } } } public static void main(String[] args) { Phaser phaser = new Phaser(3); Thread t1 = new Thread(new ThreadA(phaser)); Thread t2 = new Thread(new ThreadB(phaser)); Thread t3 = new Thread(new ThreadC(phaser)); Thread t4 = new Thread(new ThreadD(phaser)); t1.setName("ThreadA"); t2.setName("ThreadB"); t3.setName("ThreadC"); t4.setName("ThreadD"); t1.start(); t2.start(); t3.start(); t4.start(); } }
Run
Note:
awaitAdvance(int phase)并不参与parties计数的操作,仅仅具有判断的功能
更改ThreadC,将
phaser.awaitAdvance(0);
改为
phaser.awaitAdvance(1);
再Run
Note:
由于传入参数phase值和当前getPhase()返回值不一致,则立即返回
awaitAdvanceInterruptibly(int phase)
awaitAdvanceInterruptibly(int phase)作用是传入参数phase值和当前getPhase()返回值不一致时,则继续执行下面的代码
PhaserTest14.java
package org.fool.java.concurrent.phaser; import java.util.concurrent.Phaser; public class PhaserTest14 { public static class ThreadA implements Runnable { private Phaser phaser; public ThreadA(Phaser phaser) { this.phaser = phaser; } @Override public void run() { try { System.out.println(Thread.currentThread().getName() + " A1 begin " + System.currentTimeMillis()); System.out.println("phaser.getPhase()=" + phaser.getPhase()); phaser.awaitAdvanceInterruptibly(10); System.out.println(Thread.currentThread().getName() + " A1 end " + System.currentTimeMillis()); } catch (InterruptedException e) { System.out.println("InterruptedException invoked..."); e.printStackTrace(); } } } public static void main(String[] args) { Phaser phaser = new Phaser(3); Thread t1 = new Thread(new ThreadA(phaser)); t1.setName("ThreadA"); t1.start(); } }
Run
Note:
由于传入参数phase值和当前getPhase()返回值不一致,控制台程序快速继续向下执行,运行的时间几乎是一样的
awaitAdvance(int phase)是不可中断的
PhaserTest12.java
package org.fool.java.concurrent.phaser; import java.util.concurrent.Phaser; public class PhaserTest12 { public static class ThreadA implements Runnable { private Phaser phaser; public ThreadA(Phaser phaser) { this.phaser = phaser; } @Override public void run() { System.out.println(Thread.currentThread().getName() + " A1 begin " + System.currentTimeMillis()); System.out.println("phaser.getPhase()=" + phaser.getPhase()); phaser.awaitAdvance(0); System.out.println(Thread.currentThread().getName() + " A1 end " + System.currentTimeMillis()); } } public static void main(String[] args) { try { Phaser phaser = new Phaser(3); Thread t1 = new Thread(new ThreadA(phaser)); t1.setName("ThreadA"); t1.start(); Thread.sleep(3000); t1.interrupt(); System.out.println("interrupt() invoked.."); } catch (InterruptedException e) { System.out.println("InterruptedException invoked..."); e.printStackTrace(); } } }
Run
Note:
控制台没有出现异常,说明线程并未中断
awaitAdvanceInterruptibly(int phase)是可中断的
PhaserTest13.java
package org.fool.java.concurrent.phaser; import java.util.concurrent.Phaser; public class PhaserTest13 { public static class ThreadA implements Runnable { private Phaser phaser; public ThreadA(Phaser phaser) { this.phaser = phaser; } @Override public void run() { try { System.out.println(Thread.currentThread().getName() + " A1 begin " + System.currentTimeMillis()); System.out.println("phaser.getPhase()=" + phaser.getPhase()); phaser.awaitAdvanceInterruptibly(0); System.out.println(Thread.currentThread().getName() + " A1 end " + System.currentTimeMillis()); } catch (InterruptedException e) { System.out.println("InterruptedException invoked..."); e.printStackTrace(); } } } public static void main(String[] args) { try { Phaser phaser = new Phaser(3); Thread t1 = new Thread(new ThreadA(phaser)); t1.setName("ThreadA"); t1.start(); Thread.sleep(5000); t1.interrupt(); System.out.println("interrupt() invoked.."); } catch (InterruptedException e) { e.printStackTrace(); } } }
Run
Note:
控制台出现异常,线程被中断了
awaitAdvanceInterruptibly(int phase, long timeout, TimeUnit unit)
awaitAdvanceInterruptibly(int phase, long timeout, TimeUnit unit)作用是在指定的Phase等待最大的单位时间,如果在指定的时间内,Phase值未变,则出现异常,否则继续向下运行。
PhaserTest15.java
package org.fool.java.concurrent.phaser; import java.util.concurrent.Phaser; import java.util.concurrent.TimeUnit; import java.util.concurrent.TimeoutException; public class PhaserTest15 { public static class ThreadA implements Runnable { private Phaser phaser; public ThreadA(Phaser phaser) { this.phaser = phaser; } @Override public void run() { try { System.out.println(Thread.currentThread().getName() + " A1 begin " + System.currentTimeMillis()); System.out.println("phaser.getPhase()=" + phaser.getPhase()); phaser.awaitAdvanceInterruptibly(0, 5, TimeUnit.SECONDS); System.out.println(Thread.currentThread().getName() + " A1 end " + System.currentTimeMillis()); } catch (InterruptedException e) { System.out.println("InterruptedException invoked..."); e.printStackTrace(); } catch (TimeoutException e) { System.out.println("TimeoutException invoked..."); e.printStackTrace(); } } } public static void main(String[] args) { Phaser phaser = new Phaser(3); Thread t1 = new Thread(new ThreadA(phaser)); t1.setName("ThreadA"); t1.start(); } }
Run
Note:
出现了超时异常,因为5秒之后phase值并没有发生改变
修改main方法
public static void main(String[] args) { try { Phaser phaser = new Phaser(3); Thread t1 = new Thread(new ThreadA(phaser)); t1.setName("ThreadA"); t1.start(); System.out.println("phaser.getArrivedParties()=" + phaser.getArrivedParties()); Thread.sleep(1000); phaser.arrive(); System.out.println("phaser.getArrivedParties()=" + phaser.getArrivedParties()); Thread.sleep(1000); phaser.arrive(); System.out.println("phaser.getArrivedParties()=" + phaser.getArrivedParties()); Thread.sleep(1000); phaser.arrive(); System.out.println("phaser.getArrivedParties()=" + phaser.getArrivedParties()); Thread.sleep(3000); System.out.println("phaser.getPhase()=" + phaser.getPhase()); } catch (InterruptedException e) { e.printStackTrace(); } }
再Run
Note:
5秒之后phase值发生改变,继续向下运行
再次修改main方法
public static void main(String[] args) { try { Phaser phaser = new Phaser(3); Thread t1 = new Thread(new ThreadA(phaser)); t1.setName("ThreadA"); t1.start(); Thread.sleep(1000); t1.interrupt(); } catch (InterruptedException e) { e.printStackTrace(); } }
再Run
Note:
提前将还未到达5秒的线程进行了中断
Reference
Java并发编程核心方法与框架