多次在CompletableFuture中运行Runnable

Question

我想执行多个线程,它们会尝试同时添加到我的自定义列表中MyList,但是当我尝试计数时,我看不到任何输出

    public static void main(String[] args) {

        MyList<String> list = new list<String>();

        MyRunner<String> myRunner = new MyRunner<String>(list);

        ExecutorService threadPool = Executors.newFixedThreadPool(4);

        for(int i = 0; i < 20; i++) {
            CompletableFuture.runAsync(new MyRunner<String>(list));
        }

        try {
            threadPool.awaitTermination(100l, TimeUnit.SECONDS);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        System.out.println(list.getCount());
}

跑步者班:

class MyRunner<String> implements Runnable {

    MyList<String> list;

    public MyRunner(MyList <String> t) {
        this.list = t;
    }

    @Override
    public void run() {
        for(int i = 0; i < 200; i++) {
            list((String) (i + Thread.currentThread().getName()));
        }

    }
}

class MyList:

public class MyList<T> {

    Queue<T> blockingQueue;
    Lock lock;

    long count;

    public MyList() {
        blockingQueue = new LinkedList<>();
        count = 0;
        lock = new ReentrantLock();
    }

    public void add(T singleTon) {
        lock.lock();
        blockingQueue.offer(singleTon);
        count +=1;
        lock.unlock();
    }

    public long getCount() {
        return count;
    }


}

跟进问题:

使用CountDownLatch该程序并没有结束.sysout的数量是10001,最后一个输出是In runnable: 9 : pool-1-thread-1

CountDownLatch 实施:

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

        MyList<String> mylist = new MyList<>();

        CountDownLatch latch = new CountDownLatch(10);

        ExecutorService executorService = Executors.newFixedThreadPool(4);


        for(int i = 0; i < 1000; i++) {
            CompletableFuture.runAsync(new MyRunner<String>(mylist, latch), executorService);
        }

        latch.await();

        System.out.println(mylist.count);
    }


class MyRunner<String> implements Runnable {

    MyList<String> mylist;
    CountDownLatch latch;

    public MyRunner(MyList<String> mylist, CountDownLatch latch) {
       this.latch = latch;
       this.mylist = mylist;
    }

    @Override
    public void run() {
        for(int i = 0; i < 10; i++) {
            System.out.println("In runnable: "+ i + " : "+ Thread.currentThread().getName());
            mylist.add((String)("" + i));
        }

        latch.countDown();
    }
}

Answer 1

您调用CompletableFuture.runAsync(Runnable runnable)它不会使用Executor您创建的.CompletableFuture.runAsync(Runnable runnable, Executor executor)通过传递您的Executor实例来代替使用:

CompletableFuture.runAsync(new MyRunner<String>(list), threadPool);