Protorype Pattern

프로토타입 패턴은 저장된 프로토타입들 중 하나를 복제 하여 새로움 객체를 생성한다.

장점 : 크고 동적 로드 클래스의 빠른 인스턴스화가 가능 , 생성한 서브클래스를 몰라도 그들의 식별 정보를 유지

• 주의점 Clone 의 기능 구현 , Shallow Copy Deep Copy 차이, MemberwiseClone, Serialization 차이
  구현 언어나 사용 라이브러리에 따라 Clone 기능 차이 있을수 있음.

 

namespace PrototypePattern

{

[Serializable()]

public abstract class IPrototype<T>

{

// Shallow copy

public T Clone()

{

return (T)MemberwiseClone();

}

 

// Deep Copy

public T DeepCopy()

{

MemoryStream stream = new MemoryStream();

BinaryFormatter formatter = new BinaryFormatter();

formatter.Serialize(stream, this);

stream.Seek(0, SeekOrigin.Begin);

T copy = (T)formatter.Deserialize(stream);

stream.Close();

return copy;

}

}

 

[Serializable()]

// Helper class used to create a second level data structure

class DeeperData

{

public string Data { get; set; }

public DeeperData(string s)

{

Data = s;

}

public override string ToString()

{

return Data;

}

}

 

[Serializable()]

class Prototype : IPrototype<Prototype>

{

// Content members

public string Country { get; set; }

public string Capital { get; set; }

public DeeperData Language { get; set; }

public Prototype(string country, string capital, string language)

{

Country = country;

Capital = capital;

Language = new DeeperData(language);

}

public override string ToString()

{

return Country + "\t\t" + Capital + "\t\t->" + Language;

}

}

 

class PrototypeManager

{

public Dictionary<string, Prototype> prototypes = new Dictionary<string, Prototype>

{

{"Germany", new Prototype ("Germany", "Berlin", "German")},

{ "Italy", new Prototype ("Italy", "Rome", "Italian")},

{ "Australia", new Prototype ("Australia", "Canberra", "English")}

};

}

 

class Program

{

static void Report(string s, Prototype a, Prototype b)

{

Console.WriteLine("\n" + s);

Console.WriteLine("Prototype " + a + "\nClone " + b);

}

static void Main(string[] args)

{

PrototypeManager manager = new PrototypeManager();

Prototype c2, c3;

 

c2 = manager.prototypes["Australia"].Clone();

Report("Shallow cloning Australia\n===============", manager.prototypes["Australia"], c2);

 

c2.Capital = "Sydney";

Report("Altered Clone's shallow state, prototype unaffected", manager.prototypes["Australia"], c2);

 

c2.Language.Data = "Chinese";

Report("Altering Clone deep state: prototype affected *****", manager.prototypes["Australia"], c2);

 

 

c3 = manager.prototypes["Germany"].DeepCopy();

Report("Deep cloning Germany\n============", manager.prototypes["Germany"], c3);

 

c3.Capital = "Munich";

Report("Altering Clone shallow state, prototype unaffected",manager.prototypes["Germany"], c3);

 

c3.Language.Data = "Turkish";

Report("Altering Clone deep state, prototype unaffected", manager.prototypes["Germany"], c3);

}

}

}