计数器设计模式CountDown设计模式

  • Z时代
  • 2024-01-10
  • 分类：综合

编程

JDK自带的CountDownLatch 很容易的实现了这一个功能，先看jdk怎么实现的

package com.thread.ch14;
import java.util.Random;
import java.util.concurrent.CountDownLatch;
import java.util.stream.IntStream;
public class JdkCountDown {
private static final Random random = new Random(System.currentTimeMillis());
    public static void main(String[] args) throws InterruptedException {
        CountDownLatch latch = new CountDownLatch(4);
//第一步線程操作
IntStream.range(1, 5).forEach(i -> {
new Thread(() -> {
                System.out.println(Thread.currentThread().getName() + " is working");
                try {
                    Thread.sleep(random.nextInt(1000));
} catch (InterruptedException e) {
                    e.printStackTrace();
}
latch.countDown();
},String.valueOf(i)).start();
});
latch.await();
//第二部提交結果
System.out.println("多线程任务全部结束,准备第二阶段任务");
System.out.println("............");
System.out.println("FINISH");
}
}

打印结果:

1 is working
2 is working
4 is working
3 is working
多线程任务全部结束,准备第二阶段任务
............
FINISH

自己是实现一个countDown

package com.thread.ch14;
public class CountDown {
//次數
private int count = 1;
//總次數
private int total;
    public CountDown(int total) {
this.total = total;
}
public void down() {
synchronized (this) {
this.count++;
System.out.println("down-----"+Thread.currentThread().getName());
            this.notifyAll();
}
    }
public void await() throws InterruptedException {
synchronized (this) {
while (count <= total) {
this.wait();
}
        }
    }
}

package com.thread.ch14;
import java.util.Random;
import java.util.concurrent.CountDownLatch;
import java.util.stream.IntStream;
public class CountDownClient {
private static final Random random = new Random(System.currentTimeMillis());
    public static void main(String[] args) throws InterruptedException {
        CountDown latch = new CountDown(4);
//第一步線程操作
IntStream.range(1, 5).forEach(i -> {
new Thread(() -> {
                System.out.println(Thread.currentThread().getName() + " is working");
                try {
                    Thread.sleep(random.nextInt(1000));
} catch (InterruptedException e) {
                    e.printStackTrace();
}
latch.down();
},String.valueOf(i)).start();
});
latch.await();
//第二部提交結果
System.out.println("多线程任务全部结束,准备第二阶段任务");
System.out.println("............");
System.out.println("FINISH");
}
}
打印结果一样

1 is working
2 is working
4 is working
3 is working
down-----4
down-----2
down-----1
down-----3
多线程任务全部结束,准备第二阶段任务
............
FINISH
 

 

 

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