应用程序框架

ControlFramework.java

//Template and Command
import static com.mceiba.util.Print.*;
import java.util.*;
abstract class Event{
	private long eventTime;
	protected final long delayTime;
	public Event(long delayTime){
		this.delayTime = delayTime;
		start();
	}
	public void start(){
		eventTime = System.nanoTime()+delayTime;
	}
	public boolean ready(){
		return System.nanoTime()>=eventTime;
	}
	public abstract void action();
}
class Controller{
	private List<Event> eventList = new ArrayList<Event>();
	public void addEvent(Event e) { eventList.add(e); }
	public void run(){
		while(eventList.size()>0)
			for(Event e: new ArrayList<Event>(eventList))
				if(e.ready()){
					println(e);
					e.action();
					eventList.remove(e);
				}
	}
}
class GreenhouseControls extends Controller{
	private boolean light = false;
	private boolean water = false;
	private String thermostat = "Day";
	public class LightOn extends Event{
		public LightOn(long delayTime) { super(delayTime); }
		public void action(){
			//hardware control code
			//turn on the light
			light = true;
		}
		public String toString() { return "Light is on"; }
	}
	public class LightOff extends Event{
		public LightOff(long delayTime) { super(delayTime); }
		public void action(){
			//hardware control code
			//turn off the light
			light = false;
		}
		public String toString() { return "Light is off"; }
	}
	public class WaterOn extends Event{
		public WaterOn(long delayTime) { super(delayTime); }
		public void action(){
			//hardware control code
			//turn on the water
			water = true;
		}
		public String toString() { return "Water is on"; }
	}
	public class WaterOff extends Event{
		public WaterOff(long delayTime) { super(delayTime); }
		public void action(){
			//hardware control code
			//turn off the water
			water = false;
		}
		public String toString() { return "Water is off"; }
	}
	public class ThermostatNight extends Event{
		public ThermostatNight(long delayTime) { super(delayTime); }
		public void action(){
			//hardware control code
			thermostat = "Night";
		}
		public String toString() { return "Thermostat is on night setting"; }
	}
	public class ThermostatDay extends Event{
		public ThermostatDay(long delayTime) { super(delayTime); }
		public void action(){
			//hardware control code
			thermostat = "Day";
		}
		public String toString() { return "Thermostat is on day setting"; }
	}
	public class Bell extends Event{
		public Bell(long delayTime) { super(delayTime); }
		public void action(){
			addEvent(new Bell(delayTime));
		}
		public String toString() { return "Bing!"; }
	}
	public class Restart extends Event{
		private Event[] eventList;
		public Restart(long delayTime, Event[] eventList) {
			super(delayTime);
			this.eventList = eventList;
			for(Event e: eventList){
				addEvent(e);
			}
		}
		public void action(){
			for(Event e: eventList){
				e.start(); //Rerun each Event
				addEvent(e);
			}
			start(); //Rerun this event
			addEvent(this);
		}
		public String toString() { return "Restarting system"; }
	}
	public static class Terminate extends Event{
		public Terminate(long delayTime) { super(delayTime); }
		public void action(){
			System.exit(0);
		}
		public String toString() { return "Terminating"; }
	}
}
public class ControlFramework{
	public static void main(String[] args){
		GreenhouseControls gc = new GreenhouseControls();
		//Configuration
		gc.addEvent(gc.new Bell(900));
		Event[] eventList = {
			gc.new ThermostatNight(0),
			gc.new LightOn(200),
			gc.new LightOff(400),
			gc.new WaterOn(600),
			gc.new WaterOff(800),
			gc.new ThermostatDay(1400)
		};
		gc.addEvent(gc.new Restart(200, eventList));
		if(args.length == 1)
			gc.addEvent(
				new GreenhouseControls.Terminate(
					new Integer(args[0])));
		gc.run();
	}
}