问为什么我的Disruptor程序没有充分利用循环缓冲区

EN

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);
            }
        }
    }
}