多线程写入volatile变量

VolatileThreadTest.java

package com.quantum1tech.pdl.app;

import lombok.Data;
import lombok.extern.slf4j.Slf4j;

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

/**
 * <p> The describe </p>
 *
 * @author Li Xingping
 */
@Slf4j
public class VolatileThreadTest {

    public static void main(String[] args) throws InterruptedException {

        int size = 10;
        CountDownLatch countDownLatch = new CountDownLatch(size);
        ExecutorService executor = Executors.newFixedThreadPool(size + 1);

        ShareObject share = new ShareObject();

        executor.execute(new ReadTask(share));

        for (int i = 0; i < size; i++) {
            executor.execute(new WriterTask(share, countDownLatch));
        }
        countDownLatch.await();
    }

    public static class ReadTask implements Runnable {
        private final ShareObject share;

        public ReadTask(ShareObject share) {
            this.share = share;
        }

        @Override
        public void run() {
            for (; ; ) {

                log.info("当前数据{}", share.getCounter());
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    // ignore
                }

            }
        }
    }


    public static class WriterTask implements Runnable {
        private final ShareObject share;
        private final CountDownLatch countDownLatch;

        public WriterTask(ShareObject share, CountDownLatch countDownLatch) {
            this.share = share;
            this.countDownLatch = countDownLatch;
        }

        @Override
        public void run() {
            countDownLatch.countDown();
            share.increase();
        }
    }

    @Data
    public static class ShareObject {
        private volatile int counter;

        public int getCounter() {
            return counter;
        }

        public void increase() {
            try {
                Thread.sleep(400);
            } catch (InterruptedException e) {
                // ignore
            }
            this.counter++;
        }
    }
}