java并发编程实战-CyclicBarrier和FutureTask使用

import java.util.concurrent.Callable;import java.util.concurrent.CyclicBarrier;import java.util.concurrent.FutureTask;public class FutureTest {public static void main(String[] args) {new FutureTest().test();}public void test() {// 设置7个线程栅栏，为什么6个线程要设置7个栅栏，因为需要阻塞本线程等待6个线程的执行结果        final CyclicBarrier cb = new CyclicBarrier(7);        // 创建6个服务        final Service[] assembles = new Service[6];        final FutureTask[] futureTasks = new FutureTask[6];        final Domain domain = new Domain();        assembles[0] = new Service0();        assembles[1] = new Service1();        assembles[2] = new Service2();        assembles[3] = new Service3();        assembles[4] = new Service4();        assembles[5] = new Service5();        for(int i = 0; i < 6; i++) {            final int fi = i;            futureTasks[i] = new FutureTask<Integer>(new Callable<Integer>() {                  @Override                  public Integer call() throws Exception {                 try {                assembles[fi].assemble(domain);                        System.out.println(fi + "assemble");                } finally {                cb.await();                }                return fi;                }              });            new Thread(futureTasks[i]).start();         }        try {            cb.await();        } catch (Exception e) {            System.err.println(e);        }        for(int i = 0; i < 6; i++) {        try {        System.out.println(futureTasks[i].get());} catch (Exception e) {// 获取Service5抛出的异常System.err.println(e);}         }        System.out.println(domain);    }interface Service {void assemble(Domain domian);}class Domain{public String t0;public String t1;public String t2;public String t3;public String t4;@Overridepublic String toString() {return t0 + "-" +t1 + "-" +t2 + "-" +t3 + "-" + t4;}}class Service0 implements Service {@Overridepublic void assemble(Domain domian) {try {Thread.sleep(2000);} catch (InterruptedException e) {System.err.println(e);}domian.t0 = "0";}}class Service1 implements Service {@Overridepublic void assemble(Domain domian) {try {Thread.sleep(4000);} catch (InterruptedException e) {System.err.println(e);}domian.t1 = "1";}}class Service2 implements Service {@Overridepublic void assemble(Domain domian) {try {Thread.sleep(2000);} catch (InterruptedException e) {System.err.println(e);}domian.t2 = "2";}}class Service3 implements Service {@Overridepublic void assemble(Domain domian) {try {Thread.sleep(3000);} catch (InterruptedException e) {System.err.println(e);}domian.t3 = "3";}}class Service4 implements Service {@Overridepublic void assemble(Domain domian) {try {Thread.sleep(1000);} catch (InterruptedException e) {System.err.println(e);}domian.t4 = "4";}}class Service5 implements Service {@Overridepublic void assemble(Domain domian) {try {Thread.sleep(5000);} catch (InterruptedException e) {System.err.println(e);}throw new RuntimeException();}}}