《Java编程思想第四版》学习笔记34--GreenhouseControls.java的又一个版本

package innerclasses.controller;
import java.time.*;

public abstract class Event {
    private Instant eventTime;
    protected final Duration delayTime;
    public Event(long millisecondDelay) {
        delayTime = Duration.ofMillis(millisecondDelay);
        start();
    }
    public void start() {
        eventTime = Instant.now().plus(delayTime);
    }
    public boolean ready() {
        return Instant.now().isAfter(eventTime);
    }
    public abstract void action();
}

package innerclasses.controller;
import java.util.*;

public class Controller {
    private List<Event> eventList = new ArrayList<>();
    public void addEvent(Event c) {eventList.add(c);}
    public void run() {
        while (eventList.size() > 0) {
            for(Event e : new ArrayList<>(eventList)) {
                if(e.ready()) {
                    System.out.println(e);
                    e.action();
                    eventList.remove(e);
                }
            }
        }
    }
}

package innerclasses.controller;
//import innerclasses.controller.*;

public class GreenhouseControls extends Controller {
    private boolean light = false;
    public class LightOn extends Event {
        public LightOn(long delayTime) {
            super(delayTime);
        }
        @Override
        public void action() {
            light = true;
        }
        @Override
        public String toString() {
            return "Light is on";
        }
    }

    public class LightOff extends Event {
        public LightOff(long delayTime) {
            super(delayTime);
        }
        @Override
        public void action() {
            light = false;
        }
        @Override
        public String toString() {
            return "Light is off";
        }
    }

    private boolean water = false;
    public class WaterOn extends Event {
        public WaterOn(long delayTime) {
            super(delayTime);
        }
        @Override
        public void action() {
            water = true;
        }
        @Override
        public String toString() {
            return "Greenhouse water is on";
        }
    }

    public class WaterOff extends Event {
        public WaterOff(long delayTime) {
            super(delayTime);
        }
        @Override
        public void action() {
            water = false;
        }
        @Override
        public String toString() {
            return "Greenhouse water is off";
        }
    }

    private String thermostat = "Day";
    public class ThermostatNight extends Event {
        public ThermostatNight(long delayTime) {
            super(delayTime);
        }
        @Override
        public void action() {
            thermostat = "Night";
        }
        @Override
        public String toString() {
            return "Thermostat on night setting";
        }
    }

    public class ThermostatDay extends Event {
        public ThermostatDay(long delayTime) {
            super(delayTime);
        }
        @Override
        public void action() {
            thermostat = "Day";
        }
        @Override
        public String toString() {
            return "Thermostat on day setting";
        }
    }

    public class Bell extends Event {
        public Bell(long delayTime) {
            super(delayTime);
        }
        @Override
        public void action() {
            addEvent(new Bell(delayTime.toMillis()));
        }
        @Override
        public String toString() {
            return "Bing!";
        }
    }

    public class Restart extends Event {
        private Event[] eventList;
        public Restart(long delayTime, Event[] eventList) {
            super(delayTime);
            this.eventList = eventList;
/*
            //在构建器里做这个操作是不是不合适？
            for (Event e : eventList)
                addEvent(e);
*/
        }
        @Override
        public void action() {
            for (Event e : eventList) {
                e.start();
                addEvent(e);
            }
            start();
            addEvent(this);
        }
        @Override
        public String toString() {
            return "Restarting system!";
        }
    }

    public static class Terminate extends Event {
        public Terminate(long delayTime) {
            super(delayTime);
        }
        @Override
        public void action() {System.exit(0);}
        @Override
        public String toString() {
            return "Terminating!";
        }
    }

    public static void main(String[] args) {
        GreenhouseControls gc = new GreenhouseControls();
        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(2000, eventList));
        gc.addEvent(new GreenhouseControls.Terminate(5000));
        gc.run();
    }
}