Selector的实现类似中断

可以看到当发生中断时会调用wakeup方法唤醒poll方法，但并不会抛出中断异常；

//java.nio.channels.spi.AbstractSelector
  protected final void begin() {
        if (interruptor == null) {
            interruptor = new Interruptible() {
                    public void interrupt(Thread ignore) {
                        AbstractSelector.this.wakeup();
                    }};
        }
        AbstractInterruptibleChannel.blockedOn(interruptor);
        Thread me = Thread.currentThread();
        if (me.isInterrupted())
            interruptor.interrupt(me);
    }
protected final void end() {
    AbstractInterruptibleChannel.blockedOn(null);
}
//sun.nio.ch.class EPollSelectorImpl
protected int doSelect(long timeout) throws IOException {
        ......
        try {
            begin();
            pollWrapper.poll(timeout);
        } finally {
            end();
        }
        ......
    }