Elemental Design Patterns

Figures xi Tables xv Listings xvii Foreword xix Preface xxi Acknowledgments xxiii About the Author xxv Chapter 1: Introduction to Design Patterns 1 1.1 Tribal Musings 5 1.2 Art or Science? 9 Chapter 2: Elemental Design Patterns 13 2.1 Background 14 2.2 The Where, the Why, the How 17 2.3 Core EDPs 42 2.4 Conclusion 44 Chapter 3: Pattern Instance Notation 45 3.1 Basics 45 3.2 The PINbox 49 3.3 Conclusion 65 Chapter 4: Working with EDPs 67 4.1 Composition of Patterns 68 4.2 Recreating Decorator 77 4.3 Refactoring 91 4.4 The Big Picture 101 4.5 Why You May Want to Read the Appendix 105 4.6 Advanced Topics 108 4.7 Conclusion 112 Chapter 5: EDP Catalog 115 Create Object 117 Retrieve 126 Inheritance 130 Abstract Interface 140 Delegation 145 Redirection 151 Conglomeration 159 Recursion 165 Revert Method 172 Extend Method 181 Delegated Conglomeration 187 Redirected Recursion 193 Trusted Delegation 200 Trusted Redirection 209 Deputized Delegation 216 Deputized Redirection 222 Chapter 6: Intermediate Pattern Compositions 229 Fulfill Method 231 Retrieve New 235 Retrieve Shared 240 Objectifier 244 Object Recursion 251 Chapter 7: Gang of Four Pattern Compositions 259 7.1 Creational Patterns 260 7.2 Structural Patterns 265 7.3 Behavioral Patterns 273 7.4 Conclusion 279 Appendix A:Rho-Calculus 281 A.1 Reliance Operators 282 A.2 Transitivity and Isotopes 285 A.3 Similarity 286 A.4 EDP Formalisms 287 A.5 Composition and Reduction Rules 291 A.6 Pattern Instance Notation and Roles 293 A.7 EDP Definitions 295 A.8 Intermediate Pattern Definitions 308 A.9 Gang of Four Pattern Definitions 313 Bibliography 321 Index 325

Jason McC. Smith received his Ph.D. in computer science in 2005 from the University of North Carolina at Chapel Hill, where the Elemental Design Patterns were born as part of the System for Pattern Query and Recognition (SPQR) project. He then spent four years at IBM Watson Research and had the opportunity to apply the lessons of SPQR and the EDP catalog and compositional approach to immense bodies of software, both legacy and modern. Dr. Smith is currently senior research scientist at The Software Revolution, Inc., in Kirkland, WA, where he continues to refine the EDP catalog and look for ways to enhance the company's goal of automated modernization and transformation of legacy systems.