Balancing Coupling in Software Design
Universal Design Principles for Architecting Modular Software Systems
Paperback Engels 2024 9780137353484Samenvatting
This book identifies the deeper problem—how software architects and designers approach coupling – and introduces an important new approach for creating more successful designs whether you use microservices or not. Instead of blindly avoiding coupling, leading software architecture expert Vladik (Vlad) Khononov proposes a novel method that transforms it into a powerful design tool: “balanced multi-dimensional coupling.” Khononov begins by surveying existing methods of evaluating coupling, and illuminating their strengths and limitations in the context of modern distributed systems. Next, he introduces a new multi-dimensional coupling model, and demonstrates how to harness it to build modular software.
Instead of focusing solely on a single approach, Balancing Coupling in Software Design illuminates underlying design principles that are ubiquitous in SOA, microservices, DDD, design patterns, and other paradigms, revealing how each of them can fail if thoughtful design principles for coupling are neglected—and how balanced coupling can make all of them work more effectively.
Specificaties
Lezersrecensies
Inhoudsopgave
Foreword by Rebecca Wirfs-Brock xix
Foreword by Kent Beck xxi
Preface xxiii
Acknowledgments xxix
About the Author xxxi
Introduction 1
Part I: Coupling 3
Chapter 1: Coupling and System Design 5
What Is Coupling? 5
Magnitude of Coupling 6
Flow of Knowledge 10
Systems 10
Key Takeaways 16
Quiz 17
Chapter 2: Coupling and Complexity: Cynefin 19
What Is Complexity? 19
Cynefin 20
Comparing Cynefin Domains 26
Cynefin in Software Design 27
Cynefin Applications 31
Cynefin and Complexity 32
Key Takeaways 32
Quiz 33
Chapter 3: Coupling and Complexity: Interactions 35
Nature of Complexity 35
Complexity and System Design 36
Hierarchical Complexity 39
Degrees of Freedom 43
Complexity and Constraints 46
Coupling and Complex Interactions 47
Example: Connecting Coupling and Complexity 48
Key Takeaways 54
Quiz 54
Chapter 4: Coupling and Modularity 57
Modularity 57
Modules 59
Modularity in Software Systems 62
Modularity, Complexity, and Coupling 68
Coupling in Modularity 73
Key Takeaways 74
Quiz 74
Part II: Dimensions 77
Chapter 5: Structured Design's Module Coupling 79
Structured Design 80
Module Coupling 80
Comparison of Module Coupling Levels 94
Key Takeaways 95
Quiz 96
Chapter 6: Connascence 97
What Is Connascence? 97
Static Connascence 98
Dynamic Connascence 104
Evaluating Connascence 110
Key Takeaways 113
Quiz 114
Chapter 7: Integration Strength 117
Strength of Coupling 118
Integration Strength 121
Intrusive Coupling 122
Model Coupling 128
Contract Coupling 134
Integration Strength Discussion 143
Integration Strength and Asynchronous Execution 146
Key Takeaways 147
Quiz 148
Chapter 8: Distance 151
Distance and Encapsulation Boundaries 151
Additional Factors Affecting Distance 157
Distance Versus Proximity 160
Distance Versus Integration Strength 161
Key Takeaways 161
Quiz 162
Chapter 9: Volatility 165
Changes and Coupling 165
Why Software Changes 166
Evaluating Rates of Changes 169
Volatility and Integration Strength 175
Inferred Volatility 177
Key Takeaways 178
Quiz 179
Part III: Balance 181
Chapter 10: Balancing Coupling 183
Combining the Dimensions of Coupling 184
Combining Strength, Distance, and Volatility 189
Balancing Coupling on a Numeric Scale 192
Key Takeaways 198
Quiz 199
Chapter 11: Rebalancing Coupling 201
Resilient Design 201
Software Change Vectors 202
Rebalancing Coupling 205
Key Takeaways 213
Quiz 213
Chapter 12: Fractal Geometry of Software Design 215
Growth 215
Innovation 223
Fractal Geometry 228
Fractal Modularity 230
Key Takeaways 230
Quiz 231
Chapter 13: Balanced Coupling in Practice 233
Microservices 233
Architectural Patterns 239
Business Objects 245
Methods 251
Key Takeaways 256
Quiz 256
Chapter 14: Conclusion 257
Epilogue 261
Appendix A: The Ballad of Coupling 263
Appendix B: Glossary of Coupling 265
Appendix C: Answers to Quiz Questions 271
Bibliography 275
Index 279
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