Disruptor github地址为：https :
//github.com/LMAX-Exchange/disruptor

我对其进行了一个简单的测试，如下所示：

public class DisruptorMain {
    @SuppressWarnings({ "rawtypes", "unchecked" })
    public static void main(String[] args) throws Exception {
        class Element {

            private int value;

            public int get() {
                return value;
            }

            public void set(int value) {
                this.value = value;
            }

        }

        ThreadFactory threadFactory = new ThreadFactory() {
            @Override
            public Thread newThread(Runnable r) {
                return new Thread(r, "simpleThread");
            }
        };

        EventFactory<Element> factory = new EventFactory<Element>() {
            @Override
            public Element newInstance() {
                return new Element();
            }
        };

        EventHandler<Element> handler = new EventHandler<Element>() {
            @Override
            public void onEvent(Element element, long sequence, boolean endOfBatch) {
                try {
                    Thread.sleep(1000 * sequence);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

                System.out.println("Element: " + element.get());
            }
        };

        BlockingWaitStrategy strategy = new BlockingWaitStrategy();

        int bufferSize = 4;

        Disruptor<Element> disruptor = new Disruptor(factory, bufferSize, threadFactory, ProducerType.SINGLE, strategy);

        disruptor.handleEventsWith(handler);

        disruptor.start();

        RingBuffer<Element> ringBuffer = disruptor.getRingBuffer();

        for (int l = 0; l < 8; l++) {
            long sequence = ringBuffer.next();
            System.out.println("sequence:" + sequence);

            try {
                Element event = ringBuffer.get(sequence);
                event.set(l);
            } finally {
                ringBuffer.publish(sequence);
            }
        }
    }
}

结果是：序列：0序列：1序列：2序列：3元素：0元素：1元素：2元素：3序列：4序列：5序列：6序列：7元素：4元素：5元素：6元素：7

在测试中，我定义了一个4的环形缓冲区，我有一个生产者为其创建8个任务，我的问题是，当生产者将4个任务放入环形缓冲区时，使用者开始从环形缓冲区中获取任务要正常工作，在任务1完成后，环形缓冲区应该为任务5提供一个空白空间，但是结果表明，只有在环形缓冲区中所有任务都完成后，环形缓冲区才能接受新任务，为什么？