Praseed Shine UST Global s Technology Consulting group.net Arun Narayanan COO, UST Global

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1 .NET Java EE Agile continuous delivery CPU GPU.NET GoF.NET C# GoF POSA DDD POEAA EIP

2 Praseed Shine UST Global s Technology Consulting group.net Arun Narayanan COO, UST Global

3 1 GOF GOF JEE.NET J2EE patterns and practices catalogs functional programming reactive programming.net C#/.NET.NET GOF / UML

4 2 1 C# GOF POSA DDD EIP J2EE POEAA Arlow Neustadt 2 SOLID KISS YAGNI DRY/WET factory method pattern template method pattern design by contract 3 strategy pattern Dependency Injection 4 Oracle SQL Server SQLite ADO.net abstract factory pattern adapter pattern 5 composite pattern visitor pattern HTML PDF 6 composite interpreter observer builder facade Windows Presentation Foundation 7.NET.NET GOF 8.NET.NET fork/join - 9 closures lambda immutability LINQ state [ 2 ]

5 Foreword 3 10 / Map/Reduce iterator pattern 11.NET 12.NET Rx 13 RxJS RxJS 14 polyglot programming domain-specific languages ontology antipatterns C#.NET Visual Studio 2012 C#/.NET Java [ 3 ]

6 27 2 OOP SOLID Arlow/Nuestadt design by contract idiom API.NET Reflection API LINQ XML extension methods deep cloning CLR stateless

7 28 KISS Keep it simple, stupid DRY Don't repeat yourself YAGNI You aren't gonna need it low coupling SOLID OOP Ockham William Keep it simple, stupid KISS the law of parsimony KISS KISS Don't repeat yourself DRY DRY write everything twice WET [ 28 ]

8 Chapter 2 29 You aren't gonna need it YAGNI KISS code smells concrete classes interface dependency injection SOLID mnemonic acronym 1 Single Responsibility Principle SRP 2 Open Close Principle OCP 3 Liskov Substitution Principle LSP 4 Interface Segregation Principle ISP Turing Award Barbara Liskov sub-class derived class super class base class [ 29 ]

9 為什麼需要設計模式 30 5 相依性反轉 Dependency Inversion DI 這是設計架構很有用的原則在架構的情形中客戶端的程式碼會被伺服器端的程式碼呼叫而不是一般的客戶端呼叫伺服器端此處的主要原則是抽象化不應取決於細節反而是細節應取決於抽象化這原則也可稱為好萊塢原則 Hollywood principle 別打電話給我們有事我們會打電話給你筆者認為前述五個原則主要是作為一種檢查的機制如果我們檢查隨後違反這些原則的實作案例就可以證明這一點 Karl Seiguin 寫了一本名為 Foundations of Programming - Building Better Software 的電子書涵蓋了這裡所列出的大部分內容讀他的書對大部分這些題材可得到深入的了解 SOLID 原則在維基網頁 Wikipedia page 中有詳盡的介紹可見 org/wiki/solid_(object-oriented_design Robert Martin 的書 Agile Principles, Patterns, and Practices in C# 在學習 SOLID 方面是肯定需要讀的因為 Robert Martin 本人就是這些原則的創造者但是原則的短名詞是由 Michael Feathers 制定的為什麼需要設計模式筆者認為模式導向軟體開發的三個主要的優點如下一種語言 / 平台無關的方式可用來溝通有關軟體的事物一個重構方案重構的對象的工具更好的 API 設計隨著模式運動風潮的演進軟體開發社群得到一個可用來溝通有關軟體的設計架構與實作的共同語言軟體開發是一門工藝其中的每一個策略都各自有取捨而且有多種方式可開發軟體各種設計目錄為軟體開發的不協調性帶來一些觀念上的一致性 [ 30 ]

10 Chapter 2 31 handlers XML override Facade class API entity objects reference value data transfer object DTO Arlow/Nuestadt / SDLC 以模式為重構目標 API ASP.NET MVC NHibernate ASP.NET HTTP handlers API [ 31 ]

11 32.NET Reflection API user defined extensions.net Reflection API ASP.NET WCF EF WPF reflection public class Test //---- 本類別僅有的屬性 public int X get; set; //----- 本方法會被動態的呼叫 public void Spit() Console.WriteLine(" X is " + X); new X 0xBEEF.NET Reflection API Spit class Program static void Main(string[] args) Test a = new Test(); // 設定屬性 a.x = 0xBEEF; // 取得 CLR 型別 Type t = a.gettype(); if (t == null) return; //---- 取得屬性 Handle PropertyInfo np = t.getproperty("x"); //---- 取得屬性值 Console.WriteLine(np.GetValue(a)); // 取得方法 Handle MethodInfo mi = t.getmethod("spit"); // 呼叫方法 mi.invoke(a, null); Console.Read(); 33 [ 32 ]

12 Chapter 2.NET Reflection API.NET Reflection API API Reflection API UID Basic DA HRA CESS Deductions 34 Carl Gustav Jung Arlow/Nuestadt Call Apache Maven J2EE apps Eclipse OSGI rich client [ 33 ]

13 1 SeniorCitizenFemale 60 2 SeniorCitizen 60 3 OrdinaryCitizen / 18 4 DisabledCitizen 5 MilitaryPersonnel 6 Juveniles 18 entity object reference object DDD universal identifier UID handle ID 35 public class TaxableEntity public int Id get; set; public string Name get; set; public int Age get; set; public char Sex get; set; public string Location get; set; public TaxParamVO taxparams get; set; [ 34 ]

14 Chapter 2 ID TaxParams value DDD Value TaxParams public class TaxParamVO public double Basic get;set; public double DA get; set; public double HRA get; set; public double Allowance get; set; public double Deductions get; set; public double Cess get; set; public double TaxLiability get; set; public bool Computed get; set; Smalltalk Model-view-controller MVC model view controller J2EE DTO DTO public class TaxDTO public int id public TaxParamVO taxparams XML JSON 36 UI GoF [ 35 ]

15 Command object Parameters Command Dispatcher Client Execute bag bag public class COMPUTATION_CONTEXT private Dictionary<String, Object> symbols = new Dictionary<String, Object>(); public void Put(string k, Object value) symbols.add(k, value); public Object Get(string k) return symbols[k]; ComputationCommand Execute Execute bag bag COMPUTATION_ CONTEXT Interface ComputationCommand bool Execute(COMPUTATION_CONTEXT ctx); bag 37 public class SeniorCitizenCommand : ComputationCommand public bool Execute(COMPUTATION_CONTEXT ctx) TaxDTO td = (TaxDTO)ctx.Get("tax_cargo"); //---- 與其進行計算, 我們針對每一原型指派固定稅金 td.taxparams.taxliability = 1000; td.taxparams.computed = true; return true; [ 36 ]

16 Chapter 2 public class OrdinaryCitizenCommand : ComputationCommand public bool Execute(COMPUTATION_CONTEXT ctx) TaxDTO td = (TaxDTO)ctx.Get("tax_cargo"); //---- 與其進行計算, 我們針對每一原型指派固定稅金 td.taxparams.taxliability = 1500; td.taxparams.computed = true; return true; CommandDispatcher archetype COMPUTATION_CONTEXT CommandDispatcher API class CommandDispatcher public static bool Dispatch(string archetype, COMPUTATION_CONTEXT ctx) if (archetype == "SeniorCitizen") SeniorCitizenCommand cmd = new SeniorCitizenCommand(); return cmd.execute(ctx); else if (archetype == "OrdinaryCitizen") OrdinaryCitizenCommand cmd = new OrdinaryCitizenCommand(); return cmd.execute(ctx); else return false; [ 37 ]

EJB-Programming-3.PDF

EJB-Programming-3.PDF :, JBuilder EJB 2.x CMP EJB Relationships JBuilder EJB Test Client EJB EJB Seminar CMP Entity Beans Value Object Design Pattern J2EE Design Patterns Value Object Value Object Factory J2EE EJB Test Client