在并发程序中从 BlockingQueue 中取出对象而不遇到竞争条件的最佳方法是什么?我目前正在执行以下操作,但我不相信这是最好的方法:

BlockingQueue<Violation> vQueue;
/*
in the constructor I pass in a BlockingQueue object
full of violations that need to be processed - cut out for brevity
*/

Violation v;
while ( ( v = vQueue.poll(500, TimeUnit.MILLISECONDS) ) != null ) {
    // do stuff with the violation
}

我还没有达到比赛条件……但是,我不太确定这是否真的安全。

最佳答案

class Producer implements Runnable {
   private final BlockingQueue queue;
   Producer(BlockingQueue q) { queue = q; }
   public void run() {
     try {
       while (true) { queue.put(produce()); }
     } catch (InterruptedException ex) { ... handle ...}
   }
   Object produce() { ... }
 }

 class Consumer implements Runnable {
   private final BlockingQueue queue;
   Consumer(BlockingQueue q) { queue = q; }
   public void run() {
     try {
       while (true) { consume(queue.take()); }
     } catch (InterruptedException ex) { ... handle ...}
   }
   void consume(Object x) { ... }
 }

 class Setup {
   void main() {
     BlockingQueue q = new SomeQueueImplementation();
     Producer p = new Producer(q);
     Consumer c1 = new Consumer(q);
     Consumer c2 = new Consumer(q);
     new Thread(p).start();
     new Thread(c1).start();
     new Thread(c2).start();
   }
 }

这个例子取自 JDK 1.6 docs of BlockingQueue 。所以你可以看到你正在以正确的方式做这件事。这是告诉你它必须工作的报价:

关于java - 在并发程序中从 BlockingQueue 获取对象的最佳方法?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/23950/

10-10 14:23