Microsoft .NET: Architecting Applications for the Enterprise ... - BattleIT

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viii Table of Contents Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 Murphy’s Laws of the Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 3 Design Principles and Patterns . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 Basic Design Principles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 For What the Alarm Bell Should Ring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 Structured Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 Separation of Concerns. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 Object-Oriented Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 Basic OOD Principles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 Advanced Principles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 From Principles to Patterns. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 What’s a Pattern, Anyway?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 Patterns vs. Idioms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 Dependency Injection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95 Applying Requirements by Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 Testability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108 From Objects to Aspects. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116 Aspect-Oriented Programming. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116 AOP in Action . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124 Murphy’s Laws of the Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125 Part II Design of the System 4 The Business Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129 What’s the Business Logic Layer, Anyway?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130 Dissecting the Business Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130 Where Would You Fit the BLL? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134 Business and Other Layers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138 Patterns for Creating the Business Layer . . . . . . . . . . . . . . . . . . . . . . . . . 141 The Transaction Script Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145 Generalities of the TS Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145 The Pattern in Action . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149 The Table Module Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154 Generalities of the TM Pattern. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155 The TM Pattern in Action . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
Table of Contents ix The Active Record Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165 Generalities of the AR Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166 The AR Pattern in Action . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168 The Domain Model Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176 Generalities of the DM Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177 The DM Pattern in Action. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191 Murphy’s Laws of the Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192 5 The Service Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193 What’s the Service Layer, Anyway? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194 Responsibilities of the Service Layer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195 What’s a Service, Anyway? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198 Services in the Service Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201 The Service Layer Pattern in Action . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205 Generalities of the Service Layer Pattern. . . . . . . . . . . . . . . . . . . . . . . . . . 205 The Service Layer Pattern in Action . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208 Related Patterns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213 The Remote Façade Pattern. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213 The Data Transfer Object Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216 The Adapter Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218 DTO vs. Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221 Service-Oriented Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229 Tenets of SOA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230 What SOA Is Not . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 232 SOA and the Service Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 234 The Very Special Case of Rich Web Front Ends. . . . . . . . . . . . . . . . . . . . . . . . . . 237 Refactoring the Service Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238 Designing an AJAX Service Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242 Securing the AJAX Service Layer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 246 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250 Murphy’s Laws of the Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250 6 The Data Access Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251 What’s the Data Access Layer, Anyway?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251 Functional Requirements of the Data Access Layer . . . . . . . . . . . . . . . . . 252 Responsibilities of the Data Access Layer . . . . . . . . . . . . . . . . . . . . . . . . . 254 The Data Access Layer and Other Layers. . . . . . . . . . . . . . . . . . . . . . . . . . 260
Page 2 and 3: PUBLISHED BY Microsoft Press A Divi
Page 5: Contents at a Glance Part I Princip
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Page 13 and 14: Acknowledgments For at least two ye
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64 Part I Principles The attitude o
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92 Part I Principles Patterns vs. I
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94 Part I Principles Idiomatic Desi
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96 Part I Principles IoC Frameworks
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Appendix The Northwind Starter Kit
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The Northwind Database The Northwin
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414 ADO.NET ADO.NET (continued) bat
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416 class diagrams class diagrams (
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418 data access layer (DAL) data ac
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420 exceptions exceptions, 313, 398
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422 internal characteristics intern
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424 Murphy’s laws Murphy’s laws
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430 Struts Struts, 395 stubs object
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432 View method View method, 394 Vi
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About the Authors Dino Esposito Din
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