Java并发中CountDownLatch和CyclicBarrier之间的区别
CountDownLatch和CyclicBarrier都在多线程环境中使用，它们都是其中的一部分。
根据JavaDoc-
CountDownLatch-同步辅助，允许一个或多个线程等待，直到在其他线程中执行的一组操作完成。
CyclicBarrier-同步帮助，允许一组线程互相等待以到达一个公共的障碍点。
InterruptedException。不会影响其他线程
CyclicBarrier的示例
public class Main {
public static void main(String args[]) throws InterruptedException {
ExecutorService executors = Executors.newFixedThreadPool(4);
CyclicBarrier cyclicBarrier = new CyclicBarrier(5);
executors.submit(new Service1(cyclicBarrier));
executors.submit(new Service1(cyclicBarrier));
executors.submit(new Service2(cyclicBarrier));
executors.submit(new Service2(cyclicBarrier));
executors.submit(new Service2(cyclicBarrier));
Thread.sleep(3000);
System.out.println("Done");
}
}
import java.util.concurrent.BrokenBarrierException;
import java.util.concurrent.CyclicBarrier;
public class Service1 implements Runnable {
CyclicBarrier cyclicBarrier;
public Service1(CyclicBarrier cyclicBarrier) {
super();
this.cyclicBarrier = cyclicBarrier;
}
@Override
public void run() {
System.out.println("Services1" + cyclicBarrier.getNumberWaiting());
while (true) {
try {
cyclicBarrier.await();
} catch (InterruptedException | BrokenBarrierException e) {
//TODO自动生成的捕获块
e.printStackTrace();
}
}
}
}
import java.util.concurrent.BrokenBarrierException;
import java.util.concurrent.CyclicBarrier;
public class Service2 implements Runnable {
CyclicBarrier cyclicBarrier;
public Service2(CyclicBarrier cyclicBarrier) {
super();
this.cyclicBarrier = cyclicBarrier;
}
@Override
public void run() {
System.out.println("Services2" + cyclicBarrier.getNumberWaiting());
while (true) {
try {
cyclicBarrier.await();
} catch (InterruptedException | BrokenBarrierException e) {
//TODO自动生成的捕获块
e.printStackTrace();
}
}
}
}CountDownLatch的示例
public class Main {
public static void main(String args[]) throws InterruptedException {
ExecutorService executors = Executors.newFixedThreadPool(4);
CountDownLatch latch= new CountDownLatch(2);
executors.submit(new Service1(latch));
executors.submit(new Service2(latch));
latch.await();
System.out.println("Done");
}
}
import java.util.concurrent.CountDownLatch;
public class Service1 implements Runnable {
CountDownLatch latch;
public Service1(CountDownLatch latch) {
super();
this.latch = latch;
}
@Override
public void run() {
try {
Thread.sleep(20000);
} catch (InterruptedException e) {
//TODO自动生成的捕获块
e.printStackTrace();
}
latch.countDown();
System.out.println("Services2"+latch.getCount());
}
}
import java.util.concurrent.CountDownLatch;
public class Service2 implements Runnable {
CountDownLatch latch;
public Service2(CountDownLatch latch) {
super();
this.latch = latch;
}
@Override
public void run() {
try {
Thread.sleep(20000);
} catch (InterruptedException e) {
//TODO自动生成的捕获块
e.printStackTrace();
}
latch.countDown();
System.out.println("Services2"+latch.getCount());
}
}