1. Event-Driven Design Pattern，IR(Interrupter) Pattern, Trigger Pattern

2. Don't call us, we call you.

3. Callback Pattern or Listener Pattern in the way of registerring

4. ThreadPool ExecutorService

5. Dispatch --> Handler--> Worker running in ThreadPool

public void run() {        try {            while (!Thread.interrupted()) {                selector.select();                Set selected = selector.selectedKeys();                Iterator it = selected.iterator();                while (it.hasNext())                    dispatch((SelectionKey) (it.next()));                selected.clear();            }        } catch (IOException ex) {           /* ... */        }    }