[설계 패턴 C#] 21. 감시자 패턴(Observer Pattern)

[설계 패턴 C#] 21. 감시자 패턴(Observer Pattern)

---

Observer.zip

"본문 내용"

[Escort GoF의 디자인 패턴 C#] 21. 감시자 패턴(Observer Pattern)

[Escort GoF의 디자인 패턴 C#] 21. 감시자 패턴(Observer Pattern) 설계

[Escort GoF의 디자인 패턴 C#] 21. 감시자 패턴(Observer Pattern) 구현

     ▶ Subject.cs

using System.Collections.Generic;

namespace Observer

{

    class Subject

    {

        List<IUpdate> observers = new List<IUpdate>();

        public void AddObserver(IUpdate observer)

        {

            observers.Add(observer);

        }

        public void RemoveObserver(IUpdate observer)

        {

            observers.Remove(observer);

        }

        public void Notify()

        {

            foreach (IUpdate observer in observers)

            {

                observer.Update();

            }

        }

    }

}

▶ Picture.cs

using System;

namespace Observer

{

    class Picture:Subject

    {

        public string Name{    get;     private set;     }

        public int Tone {    get;     private set;    }

        public int Brightness{    get;    private set;     }

        public int Saturation{    get;    private set;    }

        public Picture(string name,int tone,int brightness,int saturation)

        {

            Name = name;

            Tone = tone;

            Brightness = brightness;

            Saturation = saturation;

        }

        public void Change(int tone,int brightness,int saturation)

        {

            Tone+=tone;

            Brightness += brightness;

            Saturation += saturation;

            Notify();

        }

        public void View()

        {

            Console.WriteLine("사진 파일명:{0}",Name);

            Console.WriteLine("    색조:{0} 명도:{1} 채도:",Tone,Brightness,Saturation);

        }

    }

}

▶ IUpdate.cs

namespace Observer

{

    interface IUpdate

    {

        void Update();

    }

}

▶ ToneViewer.cs

using System;

namespace Observer

{

    class ToneViewer:IUpdate

    {

        Picture picture = null;

        public ToneViewer(Picture picture)

        {

            this.picture = picture;

        }

        public void Update()

        {

            Console.WriteLine("이름:{0} 색조:{1}", picture.Name, picture.Tone);

        }

    }

}

▶ BrightnessViewer.cs

using System;

namespace Observer

{

    class BrightnessViewer:IUpdate

    {

        Picture picture;

        public BrightnessViewer(Picture picture)

        {

            this.picture = picture;

        }

        public void Update()

        {

            Console.WriteLine("이름:{0} 명도:{1}", picture.Name, picture.Brightness);

        }       

    }

}

▶ SaturationViewer.cs

using System;

namespace Observer

{

    class SaturationViewer :IUpdate

    {

        Picture picture = null;

        public SaturationViewer(Picture picture)

        {

            this.picture = picture;

        }

        public void Update()

        {

            Console.WriteLine("이름:{0} 채도:{1}", picture.Name, picture.Saturation);

        }

    }

}

▶ Program.cs

namespace Observer

{

    class Program

    {

        static void Main(string[] args)

        {

            Picture picture = new Picture("제주도의 밤",100,100,100);

            IUpdate[] observers = new IUpdate[3];

            observers[0] = new ToneViewer(picture);

            observers[1] = new BrightnessViewer(picture);

            observers[2] = new SaturationViewer(picture);

            picture.AddObserver(observers[0]);

            picture.AddObserver(observers[1]);

            picture.AddObserver(observers[2]);

            picture.Change(3,10,5);

        }

    }

}

---