java – 在CompletableFuture中多次运行Runnable
发布时间:2020-12-15 08:27:05 所属栏目:Java 来源:网络整理
导读: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MyList中,但是当我尝试计数时我看不到任何输出 public static void main(String[] args) { MyListString list = new listString(); MyRunnerString myRunner = new MyRunnerString(list); ExecutorServi
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MyList中,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程序没有结束. sysout的数量是10001,最后一个输出是在runnable:9:pool-1-thread-1 CountDownLatch实现: 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(); } } 解决方法
您调用不使用您创建的执行程序的CompletableFuture.runAsync(Runnable runnable).
通过传递Executor实例来代替CompletableFuture.runAsync(Runnable runnable,Executor executor),例如: CompletableFuture.runAsync(new MyRunner<String>(list),threadPool); (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |