ThisEscapeExplorer.java

ThisEscapeExplorer.java

class ThisEscape {
	private String state;
    public ThisEscape(EventSource source) {
    	state = "obj not ready";
        source.registerListener(new EventListener() {
            public void onEvent(Event e) {
                doSomething(e);
            }
        });
        state = "obj constructed done";
    }

    void doSomething(Event e) {
    	if(state == null) {
    		throw new RuntimeException("obj has not finish constructing");
    	}
    	/*this object ready? it depends: 
    	 depends on which thread is faster:
    	 ces.startSender();
         new ThisEscapeExplorer(ces);
    	 */
    }

    interface EventSource {
        void registerListener(EventListener e);
    }

    interface EventListener {
        void onEvent(Event e);
    }

    interface Event {
    }
}


class CopierEventSource implements ThisEscape.EventSource {
    public CopierEventSource() {
        Thread a = new Thread(new Runnable() {
            @Override
            public void run() {
            	sendEvent();
            }});
        this.a = a;
    }
    Thread a;
    ThisEscape.EventListener el;
    
    public void startSender() {a.start();}
    
    @Override
    public void registerListener(ThisEscape.EventListener e) {
        el = e;
    }
    
    private void sendEvent() {
        ThisEscape.Event e = new ThisEscape.Event() {
        };
        el.onEvent(e);
    }
}


public class ThisEscapeExplorer extends ThisEscape{
    EventListener el;
    
    public ThisEscapeExplorer(CopierEventSource source) {
        super(source);
        this.el = source.el;
    }
    
    void doSomething(ThisEscape.Event e) {
    	super.doSomething(e);
        System.out.println("this is: " + this);
        System.out.println("this.el is: " + el.toString());
        //el.onEvent(e);
    }
    
    public static void main(String[] args) {
        CopierEventSource ces = new CopierEventSource();
        ces.startSender();
        new ThisEscapeExplorer(ces);
    }
}