GoF 패턴의 원칙과 여러가지 패턴을 소개하고, 패턴들이 하나의 군을 이루어 활용되는 예를 설명한다.

1. Pattern Story (for .NET Developers) YoungSu, Son [email_address] Microsoft MVP Devpia Architecture&Design Sysop Devpia .NET Framework 3.0 Sysop Samsung Electronics Home Solution Group

4. What’s the Design Pattern?

7. The Definition of Design Pattern 좋은 S/W 의 밑 그림을 잘 그릴수 있는 지침 / 가이드라인

8. Model is Mother !!!

11. Oh, down to lock …

12. How to use a key …

13. Oh, you push the PRESS button …

14. Who actually needs this data?

16. GoF 2 nd Principle Favor Object Composition over Class Inheritance Don’t use Inheritance?? Developer Only use Object Composition! A swindler

17. The Two Towers in Object World. Composition & Inheritance are Two Towers in OO World A Great Architect

18. Inheritance and Composition 구분 상속 객체 합성 스타일 White Box Black Box 장점 단순하고 사용하기 편리 . 구조 명확 코드 재활용 약한 결합력 동적 바인딩 가능 캡슐화 유지 단점 부모 클래스에 종속성 발생 유연성 감소 클래스 수 폭발적 증가 캡슐화 파괴 구조가 복잡 사용시 유의해야 함 객체 수 증가 UML 구조

20. Types of Inheritance. Class Interface1 { ISomething() = 0; } Class Impl { ISomething() { .. do(); .. } } Subtyping Subclassing Interface1 +ISomething() Concrete Class1 +ISomething() Concrete Class2 +ISomething() Impl. +ISomething() Impl Inheritance +ISomething() Impl Inheritance +ISomething() A Great Architect Don’t use Subclassing

22. Principles of GoF Pattern 객체합성 상속 (subtyping) SortAlgorithm Sort() BubbleSort Sort() QuickSort Sort() UltraSort Sort() DataArray SortAlgorithm* m_pSort SetAlgorithm(SortAlgorithm* pSort) Sort()

24. Core Components of S/W Impl. 06/02/09 Devpia A&D EVA You must remember 3 Core Components! Common Part Configurable Part Variable Part Great Architect

25. Core Components of S/W Impl. 06/02/09 Devpia A&D EVA Configurable Part Variable Part Component Configurator Factory Strategy <<LINKS>> <<CREATES>> Common Part (Modularity) Log Security Transaction AOP

29. Template Method Pattern in GoF 06/02/09 Devpia A&D EVA class CQueryTemplate { public void doQuery() { string dbCommand; dbCommand = FormatConnect(); dbCommand = FormantSelect(sql); } ... } void main() { //pQT 라는 인터페이스를 선언한다 CQueryTemplate *pQT; Sql sql = “select * from AA”; if (GetDBProductInfo() = Oracle) pQT = new COracleQT(); else pQT = new CSqlSvrQT(); pQt->doQuery(sql); delete pQt; } CQueryTemplate +doQuery() #FormatConnect() #FormatSelect() COracleQT #FormatConnect() #FormatSelect() CSqlSvrQT #FormatConnect() #FormatSelect() Inversion of Control (Hollywood Principle)

31. Component Configurator in POSA2 06/02/09 Devpia A&D EVA Component +Init() +Fini() +Suspend() +Resume() +Info() Core Component Core Component Component Repository Component Configurator

32. Component Configurator in POSA2 06/02/09 Devpia A&D EVA

35. Reflection Pattern in POSA1 Component A UserInterface MetaObject A MetaObject B MOP Meta Level Base Level Component B uses uses uses uses modifies modifies provides access to further base-level components further meta-level components retrieves information

36. Reflection ModuleBuilder AssemblyModule = CreatedAssembly.DefineDynamicModule(&quot;MathModule&quot;,&quot;Math.dll&quot;); TypeBuilder MathType = AssemblyModule.DefineType(&quot;DoMath&quot;, TypeAttributes.Public | TypeAttributes.Class); System.Type [] ParamTypes = new Type[] {typeof(int),typeof(int) }; MethodBuilder SumMethod = MathType.DefineMethod(&quot;Sum&quot;, MethodAttributes.Public, typeof(int), ParamTypes); ParameterBuilder Param1 = SumMethod.DefineParameter(1,ParameterAttributes.In, &quot;num1&quot;); ParameterBuilder Param2 = SumMethod.DefineParameter(1,ParameterAttributes.In, &quot;num2&quot;); . . . MathType.CreateType(); return CreatedAssembly;

37. Reflection using System; using System.Reflection; ... public class EmitDemoTest { static void Main() { ... System.Type MathType = EmitAssembly.GetType(&quot;DoMath&quot;); object[] Parameters = new object [2]; Parameters[0] = (object) (5); Parameters[1] = (object) (9); object EmitObj = Activator.CreateInstance (MathType,false); object Result = MathType.InvokeMember(&quot;Sum&quot;, BindingFlags.InvokeMethod ,null,EmitObj,Parameters); Console.WriteLine(&quot;Sum of {0}+{1} is {2}&quot;, Parameters[0],Parameters[1],Result.ToString()); Console.ReadLine(); } }

38. Pipe & Filter Pattern in POSA1 Protocol Handler InputOutput Handler component->svc() io->receive_data() Filter::svc() parse() Filter::svc() perform() Filter::svc() log() pipe io component Protocol Pipeline svc() Read Request svc() Filter svc() Filter svc() parse() Parse Headers svc() parse() Perform Request svc() perform() Log Request svc() log()

39. Using Pipeline Perform Request Log Request HTTP/ 1.0 200 OK Date: Thu, 09 Oct 01:26:00 GMT Server: Eva/1.0 Last-Modified: Wed, 08 Oct 1997 .. Content-Length : 12345 Content-Type : text/html <HTML> <TITLE> Homepage </TITLE> .. </HTML> any.net - - [09/Oct/1997:01:26:00 -0500] “ GET /~jxh/home.html HTTP/1.0 Read Request GET /~jxh/hoem.html HTTP/1.0 Connection: Keep-Alive User-Agent: Mothra/0.1 Host: any.net Accept: image/gif, image/jpeg, */* Parse Request GET /users/jxh/public_thml/home.html HTTP /1.0 Parse Headers CONNECTION USER_AGENT HOST ACCEPT ACCEPT ACCEPT Keep-Alive Mothra/0.1 any.net image/gif image/jpeg */*

40. Pipe & Filter in WCF Services Runtime Layer Messaging Layer Behaviors Channels Instancing Behavior Security Channel TCP Transport Channel UDP Transport Channel Cross-Proc Transport Channel Queue Transport Channel HTTP Transport Channel Full Duplex Channel Reliable Messaging Channel Custom Channel Transaction Behavior CLR Type Integration Behavior Throttling Behavior Metadata Behavior Error Handling Behavior Concurrency Behavior Custom Behavior Security Channel HTTP Transport Channel TCP Transport Channel UDP Transport Channel Reliable Messaging Channel Custom Channel Instancing Behavior Custom Behavior Contract To Type Behavior

43. Factory Pattern in GOF 06/02/09 Devpia A&D EVA void main() { CMessage *pMessage = new CMessage(); if ( GetComponentInfo(“Proto”) = HTTP ) pMessage->Protocol = HTTP; else pMessage->Protocol = FTP; if ( GetComponentInfo(“Log”) = XML ) pMessage->Protocol = XML; else pMessage->Protocol = TEXT; ... pMessage->Send(“Hello”); delete pMessage; } Abstract Factory +CrateProduct() Client Concrete Factory Abstract Product Concrete Product

44. Factory Pattern in GOF 06/02/09 Devpia A&D EVA class CFactory { CMessage* GetInstance() { CMessage *pMessage = new CMessage(); if ( GetComponentInfo(“Proto”) = HTTP ) pMessage->Protocol = HTTP; else pMessage->Protocol = FTP; if ( GetComponentInfo(“Log”) = XML ) pMessage->Protocol = XML; else pMessage->Protocol = TEXT; ... return pMessage; } } Abstract Factory +CrateProduct() Client Concrete Factory Abstract Product Concrete Product Reminds Component Configurator!!

45. 3 Foe Patterns 06/02/09 Devpia A&D EVA Configurable Part Variable Part Common Part (Modularity) Log Security Transaction Component Configurator Factory Strategy <<LINKS>> <<CREATES>>

46. Observer Pattern (Misconception) 06/02/09 Devpia A&D EVA Change Data Misconception!! Or Prejudices ( 편견 !) 1. Observation 2. Notification

47. Observer is Notifieer!! 06/02/09 Devpia A&D EVA Observer in Observer Pattern is Notifieer

48. Hollywood Principle 06/02/09 Devpia A&D EVA Applicants Manager Don’t Call us!!

49. Hollywood Principle 06/02/09 Devpia A&D EVA Applicants Manager Don’t Call us! We Call You!!!

50. Flow of Observer Pattern 06/02/09 Devpia A&D EVA Data Client (Type1) Client (Type2) Client (Type3) Manager Client (Source) Observer is Notifieer Change 1. Change 2. Change 3. Notification

51. Observer Pattern in GoF 06/02/09 Devpia A&D EVA Subject +Attach (Observer o) +Detach (Observer o) +Notify() Concrete Subject Observer +Update () Concrete Observer

52. Publisher-Subscriber Replication DB Publisher Change DB Subscriber DB Subscriber DB Subscriber Reference Reference Reference

53. With Today’s Patterns Configuration File App.config Web.config Client A Client B Overhead!! File I/O Load Get Info Change Config File Notifiy Handler

54. With Today’s Patterns Configuration File App.config Web.config Client A Load Get Info Change Config File Notifiy FileSystemWatcher .NotifyFilter Handler A Smart Developer

57. Chain of Responsibility in GoF 06/02/09 Devpia A&D EVA +successor Client Handler +HandleRequest() Concrete Handler

60. Pattern Explore

61. How to Study Pattern? 06/02/09 Devpia A&D EVA

63. Patterns For Concurrent & Networked Object (POSA2) 06/02/09 Devpia A&D EVA

65. Refactoring & Anti-Patterns 06/02/09 Devpia A&D EVA

66. Various Patterns 06/02/09 Devpia A&D EVA

67. Various Patterns 06/02/09 Devpia A&D EVA