Java 并发编程 - CyclicBarrier
J.U.C 之 AQS - CyclicBarrier
- 1、关于 CyclicBarrier
- 2、await 方法
-
- 2.1 不带参的 await 方法
- 2.2 带参的 await 方法
- 2.3 CyclicBarrier 带 Runnable 参数构造
- 3、CyclicBarrier 与 CountDownLatch 的区别
1、关于 CyclicBarrier
CyclicBarrier : 它的作用就是会让所有线程都等待完成后才会继续下一步行动。
使用场景：
一个线程组的线程，需要等待所有线程完成任务后，再继续执行下一次任务。可以用于多线程计算数据，最后合并计算结果的场景。
构造方法：
-
public CyclicBarrier(int parties);让 parties 个线程都等待完成后才会继续下一步行动.
-
public CyclicBarrier(int parties, Runnable barrierAction);parties 参数是参与线程的个数. Runnable 参数的意思是最后一个到达线程要做的任务.
用于线程到达屏障时，优先执行barrierAction，方便处理更复杂的业务场景。
2、await 方法
2.1 不带参的 await 方法
await() : 调用await方法的线程告诉CyclicBarrier自己已经到达同步点，然后当前线程被阻塞。直到parties个参与线程调用了await方法,才会释放阻塞，继续进行各线程业务逻辑。
代码示例：
package com.lcao.aqs;
import lombok.extern.slf4j.Slf4j;
import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
/**
* @author
* @title: CyclicBarrierExample
* @description: TODO
* @date 2020/4/21 15:23
*/
@Slf4j
public class CyclicBarrierExample {
private static Integer threadCount = 20;
private static CyclicBarrier cyclicBarrier = new CyclicBarrier(5);
public static void main(String[] args) throws Exception{
ExecutorService threadPool = Executors.newCachedThreadPool();
for (int i = 1;i<= threadCount; i++ ) {
final int num = i;
Thread.sleep(1000); // 这里为了让控制台打印更直观，让线程休眠一秒
threadPool.execute(() -> {
try {
testMethod(num);
} catch (Exception e) {
log.info("{}-线程执行异常！", num);
}
});
}
threadPool.shutdown();
}
public static void testMethod (int num) throws Exception {
Thread.sleep(1000); // 线程休眠一秒
log.info("{}-准备就绪，等待执行！", num);
cyclicBarrier.await();
log.info("{}-执行成功！", num);
}
}
执行结果：
15:56:58.422 [pool-1-thread-1] INFO com.lcao.aqs.CyclicBarrierExample - 1-准备就绪，等待执行！
15:56:59.420 [pool-1-thread-2] INFO com.lcao.aqs.CyclicBarrierExample - 2-准备就绪，等待执行！
15:57:00.420 [pool-1-thread-3] INFO com.lcao.aqs.CyclicBarrierExample - 3-准备就绪，等待执行！
15:57:01.420 [pool-1-thread-4] INFO com.lcao.aqs.CyclicBarrierExample - 4-准备就绪，等待执行！
15:57:02.421 [pool-1-thread-5] INFO com.lcao.aqs.CyclicBarrierExample - 5-准备就绪，等待执行！
15:57:02.421 [pool-1-thread-1] INFO com.lcao.aqs.CyclicBarrierExample - 1-执行成功！
15:57:02.421 [pool-1-thread-4] INFO com.lcao.aqs.CyclicBarrierExample - 4-执行成功！
15:57:02.421 [pool-1-thread-3] INFO com.lcao.aqs.CyclicBarrierExample - 3-执行成功！
15:57:02.421 [pool-1-thread-2] INFO com.lcao.aqs.CyclicBarrierExample - 2-执行成功！
15:57:02.421 [pool-1-thread-5] INFO com.lcao.aqs.CyclicBarrierExample - 5-执行成功！
15:57:03.421 [pool-1-thread-6] INFO com.lcao.aqs.CyclicBarrierExample - 6-准备就绪，等待执行！
15:57:04.422 [pool-1-thread-5] INFO com.lcao.aqs.CyclicBarrierExample - 7-准备就绪，等待执行！
15:57:05.422 [pool-1-thread-4] INFO com.lcao.aqs.CyclicBarrierExample - 8-准备就绪，等待执行！
15:57:06.423 [pool-1-thread-3] INFO com.lcao.aqs.CyclicBarrierExample - 9-准备就绪，等待执行！
15:57:07.423 [pool-1-thread-2] INFO com.lcao.aqs.CyclicBarrierExample - 10-准备就绪，等待执行！
15:57:07.423 [pool-1-thread-6] INFO com.lcao.aqs.CyclicBarrierExample - 6-执行成功！
15:57:07.423 [pool-1-thread-5] INFO com.lcao.aqs.CyclicBarrierExample - 7-执行成功！
15:57:07.423 [pool-1-thread-4] INFO com.lcao.aqs.CyclicBarrierExample - 8-执行成功！
15:57:07.423 [pool-1-thread-3] INFO com.lcao.aqs.CyclicBarrierExample - 9-执行成功！
15:57:07.423 [pool-1-thread-2] INFO com.lcao.aqs.CyclicBarrierExample - 10-执行成功！
15:57:08.424 [pool-1-thread-1] INFO com.lcao.aqs.CyclicBarrierExample - 11-准备就绪，等待执行！
15:57:09.425 [pool-1-thread-2] INFO com.lcao.aqs.CyclicBarrierExample - 12-准备就绪，等待执行！
15:57:10.426 [pool-1-thread-3] INFO com.lcao.aqs.CyclicBarrierExample - 13-准备就绪，等待执行！
15:57:11.426 [pool-1-thread-4] INFO com.lcao.aqs.CyclicBarrierExample - 14-准备就绪，等待执行！
15:57:12.427 [pool-1-thread-5] INFO com.lcao.aqs.CyclicBarrierExample - 15-准备就绪，等待执行！
15:57:12.427 [pool-1-thread-5] INFO com.lcao.aqs.CyclicBarrierExample - 15-执行成功！
15:57:12.427 [pool-1-thread-1] INFO com.lcao.aqs.CyclicBarrierExample - 11-执行成功！
15:57:12.427 [pool-1-thread-2] INFO com.lcao.aqs.CyclicBarrierExample - 12-执行成功！
15:57:12.427 [pool-1-thread-3] INFO com.lcao.aqs.CyclicBarrierExample - 13-执行成功！
15:57:12.427 [pool-1-thread-4] INFO com.lcao.aqs.CyclicBarrierExample - 14-执行成功！
15:57:13.428 [pool-1-thread-6] INFO com.lcao.aqs.CyclicBarrierExample - 16-准备就绪，等待执行！
15:57:14.428 [pool-1-thread-4] INFO com.lcao.aqs.CyclicBarrierExample - 17-准备就绪，等待执行！
15:57:15.429 [pool-1-thread-3] INFO com.lcao.aqs.CyclicBarrierExample - 18-准备就绪，等待执行！
15:57:16.430 [pool-1-thread-2] INFO com.lcao.aqs.CyclicBarrierExample - 19-准备就绪，等待执行！
15:57:17.430 [pool-1-thread-1] INFO com.lcao.aqs.CyclicBarrierExample - 20-准备就绪，等待执行！
15:57:17.430 [pool-1-thread-1] INFO com.lcao.aqs.CyclicBarrierExample - 20-执行成功！
15:57:17.430 [pool-1-thread-6] INFO com.lcao.aqs.CyclicBarrierExample - 16-执行成功！
15:57:17.430 [pool-1-thread-4] INFO com.lcao.aqs.CyclicBarrierExample - 17-执行成功！
15:57:17.430 [pool-1-thread-3] INFO com.lcao.aqs.CyclicBarrierExample - 18-执行成功！
15:57:17.430 [pool-1-thread-2] INFO com.lcao.aqs.CyclicBarrierExample - 19-执行成功！
Process finished with exit code 0
2.2 带参的 await 方法
await(long timeout, TimeUnit unit)带参方法，第一个参数是超时时间，第二个参数是超时时间单位。
使用该方法表示，如果等待时间到达了超时时间，那么已经达到同步点的线程释放阻塞，继续进行相关线程业务逻辑。
代码示例：
package com.lcao.aqs;
import lombok.extern.slf4j.Slf4j;
import java.util.concurrent.*;
/**
* @author
* @title: CyclicBarrierExample
* @description: TODO
* @date 2020/4/21 15:23
*/
@Slf4j
public class CyclicBarrierExample2 {
private static Integer threadCount = 10;
private static CyclicBarrier cyclicBarrier = new CyclicBarrier(5);
public static void main(String[] args) throws Exception{
ExecutorService threadPool = Executors.newCachedThreadPool();
for (int i = 1;i<= threadCount; i++ ) {
final int num = i;
Thread.sleep(1000); // 这里为了让控制台打印更直观，让线程休眠一秒
threadPool.execute(() -> {
try {
testMethod(num);
} catch (Exception e) {
log.info("{}-线程执行异常！", num);
}
});
}
threadPool.shutdown();
}
public static void testMethod (int num) throws Exception {
Thread.sleep(1000); // 线程休眠一秒
log.info("{}-准备就绪，等待执行！", num);
// 这里使用 await(long timeout, TimeUnit unit) 方法
// 该方法的含义是，当等待时间达到超时时间后，便不再等待，直接执行。
// 这里会抛出异常，所以在使用await带参方法时，一定要对异常进行捕获处理，以便不影响后续逻辑
try {
cyclicBarrier.await(1000, TimeUnit.MILLISECONDS);
} catch (TimeoutException | BrokenBarrierException e) {
log.warn("BarrierExceptions", e);
}
log.info("{}-执行成功！", num);
}
}
执行结果：
15:58:38.136 [pool-1-thread-1] INFO com.lcao.aqs.CyclicBarrierExample2 - 1-准备就绪，等待执行！
15:58:39.136 [pool-1-thread-2] INFO com.lcao.aqs.CyclicBarrierExample2 - 2-准备就绪，等待执行！
15:58:39.142 [pool-1-thread-2] WARN com.lcao.aqs.CyclicBarrierExample2 - BarrierExceptions
java.util.concurrent.BrokenBarrierException: null
at java.util.concurrent.CyclicBarrier.dowait(CyclicBarrier.java:250)
at java.util.concurrent.CyclicBarrier.await(CyclicBarrier.java:435)
at com.lcao.aqs.CyclicBarrierExample2.testMethod(CyclicBarrierExample2.java:47)
at com.lcao.aqs.CyclicBarrierExample2.lambda$main$0(CyclicBarrierExample2.java:30)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
15:58:39.142 [pool-1-thread-1] WARN com.lcao.aqs.CyclicBarrierExample2 - BarrierExceptions
java.util.concurrent.TimeoutException: null
at java.util.concurrent.CyclicBarrier.dowait(CyclicBarrier.java:257)
at java.util.concurrent.CyclicBarrier.await(CyclicBarrier.java:435)
at com.lcao.aqs.CyclicBarrierExample2.testMethod(CyclicBarrierExample2.java:47)
at com.lcao.aqs.CyclicBarrierExample2.lambda$main$0(CyclicBarrierExample2.java:30)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
15:58:39.143 [pool-1-thread-2] INFO com.lcao.aqs.CyclicBarrierExample2 - 2-执行成功！
15:58:39.143 [pool-1-thread-1] INFO com.lcao.aqs.CyclicBarrierExample2 - 1-执行成功！
15:58:40.136 [pool-1-thread-3] INFO com.lcao.aqs.CyclicBarrierExample2 - 3-准备就绪，等待执行！
15:58:40.136 [pool-1-thread-3] WARN com.lcao.aqs.CyclicBarrierExample2 - BarrierExceptions
java.util.concurrent.BrokenBarrierException: null
at java.util.concurrent.CyclicBarrier.dowait(CyclicBarrier.java:207)
at java.util.concurrent.CyclicBarrier.await(CyclicBarrier.java:435)
at com.lcao.aqs.CyclicBarrierExample2.testMethod(CyclicBarrierExample2.java:47)
at com.lcao.aqs.CyclicBarrierExample2.lambda$main$0(CyclicBarrierExample2.java:30)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
15:58:40.136 [pool-1-thread-3] INFO com.lcao.aqs.CyclicBarrierExample2 - 3-执行成功！
15:58:41.136 [pool-1-thread-1] INFO com.lcao.aqs.CyclicBarrierExample2 - 4-准备就绪，等待执行！
15:58:41.136 [pool-1-thread-1] WARN com.lcao.aqs.CyclicBarrierExample2 - BarrierExceptions
java.util.concurrent.BrokenBarrierException: null
at java.util.concurrent.CyclicBarrier.dowait(CyclicBarrier.java:207)
at java.util.concurrent.CyclicBarrier.await(CyclicBarrier.java:435)
at com.lcao.aqs.CyclicBarrierExample2.testMethod(CyclicBarrierExample2.java:47)
at com.lcao.aqs.CyclicBarrierExample2.lambda$main$0(CyclicBarrierExample2.java:30)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
15:58:41.136 [pool-1-thread-1] INFO com.lcao.aqs.CyclicBarrierExample2 - 4-执行成功！
15:58:42.137 [pool-1-thread-3] INFO com.lcao.aqs.CyclicBarrierExample2 - 5-准备就绪，等待执行！
15:58:42.137 [pool-1-thread-3] WARN com.lcao.aqs.CyclicBarrierExample2 - BarrierExceptions
java.util.concurrent.BrokenBarrierException: null
at java.util.concurrent.CyclicBarrier.dowait(CyclicBarrier.java:207)
at java.util.concurrent.CyclicBarrier.await(CyclicBarrier.java:435)
at com.lcao.aqs.CyclicBarrierExample2.testMethod(CyclicBarrierExample2.java:47)
at com.lcao.aqs.CyclicBarrierExample2.lambda$main$0(CyclicBarrierExample2.java:30)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
15:58:42.137 [pool-1-thread-3] INFO com.lcao.aqs.CyclicBarrierExample2 - 5-执行成功！
15:58:43.137 [pool-1-thread-1] INFO com.lcao.aqs.CyclicBarrierExample2 - 6-准备就绪，等待执行！
15:58:43.137 [pool-1-thread-1] WARN com.lcao.aqs.CyclicBarrierExample2 - BarrierExceptions
java.util.concurrent.BrokenBarrierException: null
at java.util.concurrent.CyclicBarrier.dowait(CyclicBarrier.java:207)
at java.util.concurrent.CyclicBarrier.await(CyclicBarrier.java:435)
at com.lcao.aqs.CyclicBarrierExample2.testMethod(CyclicBarrierExample2.java:47)
at com.lcao.aqs.CyclicBarrierExample2.lambda$main$0(CyclicBarrierExample2.java:30)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
15:58:43.137 [pool-1-thread-1] INFO com.lcao.aqs.CyclicBarrierExample2 - 6-执行成功！
15:58:44.137 [pool-1-thread-3] INFO com.lcao.aqs.CyclicBarrierExample2 - 7-准备就绪，等待执行！
15:58:44.137 [pool-1-thread-3] WARN com.lcao.aqs.CyclicBarrierExample2 - BarrierExceptions
java.util.concurrent.BrokenBarrierException: null
at java.util.concurrent.CyclicBarrier.dowait(CyclicBarrier.java:207)
at java.util.concurrent.CyclicBarrier.await(CyclicBarrier.java:435)
at com.lcao.aqs.CyclicBarrierExample2.testMethod(CyclicBarrierExample2.java:47)
at com.lcao.aqs.CyclicBarrierExample2.lambda$main$0(CyclicBarrierExample2.java:30)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
15:58:44.137 [pool-1-thread-3] INFO com.lcao.aqs.CyclicBarrierExample2 - 7-执行成功！
15:58:45.137 [pool-1-thread-1] INFO com.lcao.aqs.CyclicBarrierExample2 - 8-准备就绪，等待执行！
15:58:45.137 [pool-1-thread-1] WARN com.lcao.aqs.CyclicBarrierExample2 - BarrierExceptions
java.util.concurrent.BrokenBarrierException: null
at java.util.concurrent.CyclicBarrier.dowait(CyclicBarrier.java:207)
at java.util.concurrent.CyclicBarrier.await(CyclicBarrier.java:435)
at com.lcao.aqs.CyclicBarrierExample2.testMethod(CyclicBarrierExample2.java:47)
at com.lcao.aqs.CyclicBarrierExample2.lambda$main$0(CyclicBarrierExample2.java:30)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
15:58:45.137 [pool-1-thread-1] INFO com.lcao.aqs.CyclicBarrierExample2 - 8-执行成功！
15:58:46.137 [pool-1-thread-3] INFO com.lcao.aqs.CyclicBarrierExample2 - 9-准备就绪，等待执行！
15:58:46.137 [pool-1-thread-3] WARN com.lcao.aqs.CyclicBarrierExample2 - BarrierExceptions
java.util.concurrent.BrokenBarrierException: null
at java.util.concurrent.CyclicBarrier.dowait(CyclicBarrier.java:207)
at java.util.concurrent.CyclicBarrier.await(CyclicBarrier.java:435)
at com.lcao.aqs.CyclicBarrierExample2.testMethod(CyclicBarrierExample2.java:47)
at com.lcao.aqs.CyclicBarrierExample2.lambda$main$0(CyclicBarrierExample2.java:30)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
15:58:46.137 [pool-1-thread-3] INFO com.lcao.aqs.CyclicBarrierExample2 - 9-执行成功！
15:58:47.138 [pool-1-thread-1] INFO com.lcao.aqs.CyclicBarrierExample2 - 10-准备就绪，等待执行！
15:58:47.138 [pool-1-thread-1] WARN com.lcao.aqs.CyclicBarrierExample2 - BarrierExceptions
java.util.concurrent.BrokenBarrierException: null
at java.util.concurrent.CyclicBarrier.dowait(CyclicBarrier.java:207)
at java.util.concurrent.CyclicBarrier.await(CyclicBarrier.java:435)
at com.lcao.aqs.CyclicBarrierExample2.testMethod(CyclicBarrierExample2.java:47)
at com.lcao.aqs.CyclicBarrierExample2.lambda$main$0(CyclicBarrierExample2.java:30)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
15:58:47.138 [pool-1-thread-1] INFO com.lcao.aqs.CyclicBarrierExample2 - 10-执行成功！
Process finished with exit code 0
2.3 CyclicBarrier 带 Runnable 参数构造
这是 CyclicBarrier 类中含 Runnable 参数的源码，其中 Runnable 类中的业务逻辑，在 parties个线程都准备好之后执行。
public CyclicBarrier(int parties, Runnable barrierAction) {
if (parties <= 0) throw new IllegalArgumentException();
this.parties = parties;
this.count = parties;
this.barrierCommand = barrierAction;
}
代码示例：
package com.lcao.aqs;
import lombok.extern.slf4j.Slf4j;
import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
/**
* @author
* @title: CyclicBarrierExample1
* @description: TODO
* @date 2020/4/21 15:37
*/
@Slf4j
public class CyclicBarrierExample1 {
private static Integer threadCount = 20;
private static CyclicBarrier cyclicBarrier = new CyclicBarrier(5,() ->{
log.info("所有线程准备完成后，到达这一步，然后再执行各线程逻辑");
});
public static void main(String[] args) throws Exception{
ExecutorService threadPool = Executors.newCachedThreadPool();
for (int i = 1;i<= threadCount; i++ ) {
final int num = i;
Thread.sleep(1000); // 这里为了让控制台打印更直观，让线程休眠一秒
threadPool.execute(() -> {
try {
testMethod(num);
} catch (Exception e) {
log.info("{}-线程执行异常！", num);
}
});
}
threadPool.shutdown();
}
public static void testMethod (int num) throws Exception {
Thread.sleep(1000); // 线程休眠一秒
log.info("{}-准备就绪，等待执行！", num);
cyclicBarrier.await();
log.info("{}-执行成功！", num);
}
}
执行结果：
15:59:43.938 [pool-1-thread-1] INFO com.lcao.aqs.CyclicBarrierExample1 - 1-准备就绪，等待执行！
15:59:44.935 [pool-1-thread-2] INFO com.lcao.aqs.CyclicBarrierExample1 - 2-准备就绪，等待执行！
15:59:45.937 [pool-1-thread-3] INFO com.lcao.aqs.CyclicBarrierExample1 - 3-准备就绪，等待执行！
15:59:46.936 [pool-1-thread-4] INFO com.lcao.aqs.CyclicBarrierExample1 - 4-准备就绪，等待执行！
15:59:47.937 [pool-1-thread-5] INFO com.lcao.aqs.CyclicBarrierExample1 - 5-准备就绪，等待执行！
15:59:47.937 [pool-1-thread-5] INFO com.lcao.aqs.CyclicBarrierExample1 - 所有线程准备完成后，到达这一步，然后再执行各线程逻辑
15:59:47.938 [pool-1-thread-1] INFO com.lcao.aqs.CyclicBarrierExample1 - 1-执行成功！
15:59:47.938 [pool-1-thread-2] INFO com.lcao.aqs.CyclicBarrierExample1 - 2-执行成功！
15:59:47.938 [pool-1-thread-3] INFO com.lcao.aqs.CyclicBarrierExample1 - 3-执行成功！
15:59:47.938 [pool-1-thread-4] INFO com.lcao.aqs.CyclicBarrierExample1 - 4-执行成功！
15:59:47.938 [pool-1-thread-5] INFO com.lcao.aqs.CyclicBarrierExample1 - 5-执行成功！
15:59:48.938 [pool-1-thread-6] INFO com.lcao.aqs.CyclicBarrierExample1 - 6-准备就绪，等待执行！
15:59:49.937 [pool-1-thread-5] INFO com.lcao.aqs.CyclicBarrierExample1 - 7-准备就绪，等待执行！
15:59:50.938 [pool-1-thread-1] INFO com.lcao.aqs.CyclicBarrierExample1 - 8-准备就绪，等待执行！
15:59:51.939 [pool-1-thread-4] INFO com.lcao.aqs.CyclicBarrierExample1 - 9-准备就绪，等待执行！
15:59:52.939 [pool-1-thread-3] INFO com.lcao.aqs.CyclicBarrierExample1 - 10-准备就绪，等待执行！
15:59:52.939 [pool-1-thread-3] INFO com.lcao.aqs.CyclicBarrierExample1 - 所有线程准备完成后，到达这一步，然后再执行各线程逻辑
15:59:52.939 [pool-1-thread-5] INFO com.lcao.aqs.CyclicBarrierExample1 - 7-执行成功！
15:59:52.939 [pool-1-thread-6] INFO com.lcao.aqs.CyclicBarrierExample1 - 6-执行成功！
15:59:52.939 [pool-1-thread-1] INFO com.lcao.aqs.CyclicBarrierExample1 - 8-执行成功！
15:59:52.939 [pool-1-thread-4] INFO com.lcao.aqs.CyclicBarrierExample1 - 9-执行成功！
15:59:52.939 [pool-1-thread-3] INFO com.lcao.aqs.CyclicBarrierExample1 - 10-执行成功！
15:59:53.940 [pool-1-thread-2] INFO com.lcao.aqs.CyclicBarrierExample1 - 11-准备就绪，等待执行！
15:59:54.940 [pool-1-thread-3] INFO com.lcao.aqs.CyclicBarrierExample1 - 12-准备就绪，等待执行！
15:59:55.940 [pool-1-thread-4] INFO com.lcao.aqs.CyclicBarrierExample1 - 13-准备就绪，等待执行！
15:59:56.941 [pool-1-thread-1] INFO com.lcao.aqs.CyclicBarrierExample1 - 14-准备就绪，等待执行！
15:59:57.942 [pool-1-thread-6] INFO com.lcao.aqs.CyclicBarrierExample1 - 15-准备就绪，等待执行！
15:59:57.942 [pool-1-thread-6] INFO com.lcao.aqs.CyclicBarrierExample1 - 所有线程准备完成后，到达这一步，然后再执行各线程逻辑
15:59:57.942 [pool-1-thread-6] INFO com.lcao.aqs.CyclicBarrierExample1 - 15-执行成功！
15:59:57.942 [pool-1-thread-2] INFO com.lcao.aqs.CyclicBarrierExample1 - 11-执行成功！
15:59:57.942 [pool-1-thread-3] INFO com.lcao.aqs.CyclicBarrierExample1 - 12-执行成功！
15:59:57.942 [pool-1-thread-4] INFO com.lcao.aqs.CyclicBarrierExample1 - 13-执行成功！
15:59:57.942 [pool-1-thread-1] INFO com.lcao.aqs.CyclicBarrierExample1 - 14-执行成功！
15:59:58.942 [pool-1-thread-5] INFO com.lcao.aqs.CyclicBarrierExample1 - 16-准备就绪，等待执行！
15:59:59.942 [pool-1-thread-1] INFO com.lcao.aqs.CyclicBarrierExample1 - 17-准备就绪，等待执行！
16:00:00.943 [pool-1-thread-4] INFO com.lcao.aqs.CyclicBarrierExample1 - 18-准备就绪，等待执行！
16:00:01.943 [pool-1-thread-3] INFO com.lcao.aqs.CyclicBarrierExample1 - 19-准备就绪，等待执行！
16:00:02.944 [pool-1-thread-2] INFO com.lcao.aqs.CyclicBarrierExample1 - 20-准备就绪，等待执行！
16:00:02.944 [pool-1-thread-2] INFO com.lcao.aqs.CyclicBarrierExample1 - 所有线程准备完成后，到达这一步，然后再执行各线程逻辑
16:00:02.944 [pool-1-thread-2] INFO com.lcao.aqs.CyclicBarrierExample1 - 20-执行成功！
16:00:02.944 [pool-1-thread-1] INFO com.lcao.aqs.CyclicBarrierExample1 - 17-执行成功！
16:00:02.944 [pool-1-thread-4] INFO com.lcao.aqs.CyclicBarrierExample1 - 18-执行成功！
16:00:02.944 [pool-1-thread-5] INFO com.lcao.aqs.CyclicBarrierExample1 - 16-执行成功！
16:00:02.944 [pool-1-thread-3] INFO com.lcao.aqs.CyclicBarrierExample1 - 19-执行成功！
Process finished with exit code 0
补充说明 :
//上述示例中代码：
private static CyclicBarrier cyclicBarrier = new CyclicBarrier(5,() ->{
log.info("所有线程准备完成后，到达这一步，然后再执行各线程逻辑");
});
// 等同于：
private static CyclicBarrier cyclicBarrier = new CyclicBarrier(5, new Runnable() {
@Override
public void run() {
log.info("所有线程准备完成后，到达这一步，然后再执行各线程逻辑");
}
});
3、CyclicBarrier 与 CountDownLatch 的区别
- CountDownLatch 是一次性的，CyclicBarrier 是可循环利用的，所以CyclicBarrier能够处理更为复杂的场景。
- CyclicBarrier还提供了一些其他有用的方法，比如getNumberWaiting()方法可以获得CyclicBarrier阻塞的线程数量，isBroken()方法用来了解阻塞的线程是否被中断。
- CountDownLatch允许一个或多个线程等待一组事件的产生，而CyclicBarrier用于等待其他线程运行到栅栏位置。
.