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CountDownLatch 简单举例

一句话解释:主线程阻塞,其他线程完成后,主线程被唤醒后继续执行

 1 import java.util.Random;
 2 import java.util.concurrent.CountDownLatch;
 3 
 4 import org.slf4j.Logger;
 5 import org.slf4j.LoggerFactory;
 6 
 7 public class CountDownLatchLearn {
 8     
 9     private Logger log = LoggerFactory.getLogger(CountDownLatchLearn.class);
10     private CountDownLatch countDownLatch;
11     
12     public CountDownLatchLearn() {
13         countDownLatch = new CountDownLatch(50);
14     }
15     
16     public void countDown() {
17         Long count = countDownLatch.getCount();
18         log.debug("countDownLatch count is:" + count.toString());
19         
20         for (int i = 0; i < count; i++) {
21             Work work = new Work(String.valueOf(i), countDownLatch);
22             work.start();
23         }
24         try {
25             countDownLatch.await();
26         } catch (InterruptedException e) {
27             e.printStackTrace();
28         }
29         log.debug("work finish!!!");
30     }
31     
32     private class Work extends Thread {
33         
34         private String name;
35         private CountDownLatch countDownLatch;
36         
37         public Work(String name, CountDownLatch countDownLatch) {
38             this.name = name;
39             this.countDownLatch = countDownLatch;
40         }
41         
42         @Override
43         public void run() {
44             Random r = new Random();
45             int sleep = r.nextInt(2000);
46             try {
47                 log.debug("thread sleep: "+ sleep);
48                 Thread.sleep(sleep);
49             } catch (InterruptedException e) {
50                 e.printStackTrace();
51             }
52             log.debug("thread: " + name + ": do work");
53             countDownLatch.countDown();
54         }
55     }
56 
57     public static void main(String[] args) {
58         System.out.println("main start!!!");
59         
60         CountDownLatchLearn countDownLatchLearn = new CountDownLatchLearn();
61         countDownLatchLearn.countDown();
62         
63         System.out.println("main end!!!");
64     }
65 
66 }

posted on 2017-07-13 11:18 丑男 阅读(192) 评论(0)  编辑  收藏 所属分类: Java


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