AQS—CountDownLatch

CountDownlatch 클래스 소개
        Countdown Latch 는 동기 화 보조 클래스 입 니 다.이 를 통 해 현재 스 레 드 를 막 는 것 과 유사 한 기능 을 완성 할 수 있 습 니 다.다시 말 하면 하나의 스 레 드 나 여러 스 레 드 가 실 행 될 때 까지 기다 릴 수 있 습 니 다.Countdown Latch 는 주어진 계수 기 를 사용 하여 초기 화 했 습 니 다.이 계수 기 는 원자 조작 이 며,동시에 하나의 스 레 드 만 이 계산 기 를 조작 할 수 있 습 니 다.이 종류의 await()방법 을 호출 하 는 스 레 드 는 다른 스 레 드 가 countDown()을 호출 할 때 까지 현재 카운터 의 값 을 0 으로 변경 합 니 다.countDown()방법 을 호출 할 때마다 계수기 의 값 은 1 로 줄 어 들 고 계수기 의 값 이 0 으로 줄 어 들 때 await()방법 을 호출 하여 대기 상태 에 있 는 모든 스 레 드 는 계속 아래로 실 행 됩 니 다.이 작업 은 한 번 만 나타 납 니 다.이 계수기 의 값 은 리 셋 될 수 없 기 때 문 입 니 다.
      장면 분석 사용
        일부 업무 장면 에서 프로그램 집행 은 특정한 조건 이 완 성 된 후에 야 후속 작업 을 계속 수행 할 수 있다.전형 적 인 응용,예 를 들 어 병행 계산 은 특정한 처리 의 연산 량 이 많 을 때 이 연산 임 무 를 여러 개의 키 임무 로 나 누 어 모든 하위 임 무 를 완성 한 후에 아버지 임 무 는 모든 하위 임무 의 연산 결 과 를 얻 고 집계 할 수 있다.
CountDownlatch 사용 예시:

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);
	}
}

실행 결과:

20:09:37.464 [pool-1-thread-159] INFO com.yuxing.springbootdemo.juc.CountDownLatchExample - 158
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