AQS—CountDownLatch

其他 2018-11-03 10:29:50 阅读次数: 0

      CountDownLatch类介绍

        CountDownLatch是一个同步辅助类，通过它可以完成类似于阻塞当前线程功能，换句话说，一个线程或多个线程一直等待，直到其它线程执行的操作完成。CountDownLatch用了一个给定的计数器来进行初始化，该计数器的操作是原子操作，就是同时只能有一个线程去操作该计数器。调用该类的await()方法的线程会一直处于阻塞状态，直到其它线程调用countDown()这个方法，使当前计数器的值变为0。每次调用countDown()方法时，计数器的值会减1，当计数器的值减到0的时候，所有因调用await()方法而处于等待状态的线程就会继续往下执行，这种操作只会出现一次，因为这个计数器的值是不能被重置的。

      使用场景分析

        在某些业务场景中，程序执行需要等待某个条件完成后才能继续执行后续的操作。典型的应用，比如说并行计算，当某个处理的运算量很大时，可以将该运算任务拆分成多个子任务，等待所有的子任务都完成之后，父任务再拿到所有子任务的运算结果进行汇总。

CountDownLatch使用举例：

package com.yuxing.springbootdemo.juc;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import lombok.extern.slf4j.Slf4j;

@Slf4j
public class CountDownLatchExample {
	
	private static int threadCount = 200;
	
	public static void main(String[] args) throws InterruptedException {
		ExecutorService exec = Executors.newCachedThreadPool();
		final CountDownLatch countDownLatch = new CountDownLatch(threadCount);
		for(int i = 0;i < threadCount;i++){
			final int threadNum = i;
			exec.execute(() -> {
				try {
					test(threadNum);
				} catch (InterruptedException e) {
					log.error("exception", e);
				}finally {
					countDownLatch.countDown();
				}
			});
		}
		countDownLatch.await();
		log.info("finish");
		exec.shutdown();
	}
	
	private static void test(int threadNum) throws InterruptedException {
		Thread.sleep(100);
		log.info("{}", threadNum);
		Thread.sleep(100);
	}
}

运行结果：

20:09:37.464 [pool-1-thread-159] INFO com.yuxing.springbootdemo.juc.CountDownLatchExample - 158
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20:09:37.480 [pool-1-thread-20] INFO com.yuxing.springbootdemo.juc.CountDownLatchExample - 19
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20:09:37.479 [pool-1-thread-31] INFO com.yuxing.springbootdemo.juc.CountDownLatchExample - 30
20:09:37.480 [pool-1-thread-21] INFO com.yuxing.springbootdemo.juc.CountDownLatchExample - 20
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20:09:37.474 [pool-1-thread-52] INFO com.yuxing.springbootdemo.juc.CountDownLatchExample - 51
20:09:37.470 [pool-1-thread-139] INFO com.yuxing.springbootdemo.juc.CountDownLatchExample - 138
20:09:37.470 [pool-1-thread-147] INFO com.yuxing.springbootdemo.juc.CountDownLatchExample - 146
20:09:37.464 [pool-1-thread-168] INFO com.yuxing.springbootdemo.juc.CountDownLatchExample - 167
20:09:37.474 [pool-1-thread-55] INFO com.yuxing.springbootdemo.juc.CountDownLatchExample - 54
20:09:37.464 [pool-1-thread-155] INFO com.yuxing.springbootdemo.juc.CountDownLatchExample - 154
20:09:37.464 [pool-1-thread-160] INFO com.yuxing.springbootdemo.juc.CountDownLatchExample - 159
20:09:37.468 [pool-1-thread-133] INFO com.yuxing.springbootdemo.juc.CountDownLatchExample - 132
20:09:37.464 [pool-1-thread-176] INFO com.yuxing.springbootdemo.juc.CountDownLatchExample - 175
20:09:37.468 [pool-1-thread-127] INFO com.yuxing.springbootdemo.juc.CountDownLatchExample - 126
20:09:37.468 [pool-1-thread-195] INFO com.yuxing.springbootdemo.juc.CountDownLatchExample - 194
20:09:37.464 [pool-1-thread-173] INFO com.yuxing.springbootdemo.juc.CountDownLatchExample - 172
20:09:37.468 [pool-1-thread-192] INFO com.yuxing.springbootdemo.juc.CountDownLatchExample - 191
20:09:37.468 [pool-1-thread-130] INFO com.yuxing.springbootdemo.juc.CountDownLatchExample - 129
20:09:37.640 [main] INFO com.yuxing.springbootdemo.juc.CountDownLatchExample - finish

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