Vaughn Vernon is a champion of simplifying software architecture and development, with an emphasis on reactive methods. He has a unique ability to teach and lead with Domain-Driven Design using lightweight tools to unveil unimagined value. He helps organizations achieve competitive advantages using enduring tools such as architectures, patterns, and approaches, and through partnerships between business stakeholders and software developers.

Preface xi

Acknowledgments xv

About the Author xvii

Chapter 1: DDD for Me 1

Will DDD Hurt? 2

Good, Bad, and Effective Design 3

Strategic Design 7

Tactical Design 8

The Learning Process and Refining Knowledge 9

Let’s Get Started! 10

Chapter 2: Strategic Design with Bounded Contexts and the Ubiquitous Language 11

Domain Experts and Business Drivers 17

Case Study 21

Fundamental Strategic Design Needed 25

Challenge and Unify 29

Developing a Ubiquitous Language 34

Architecture 41

Summary 44

Chapter 3: Strategic Design with Subdomains 45

What Is a Subdomain? 46

Types of Subdomains 46

Dealing with Complexity 47

Summary 50

Chapter 4: Strategic Design with Context Mapping 51

Kinds of Mappings 54

Making Good Use of Context Mapping 60

An Example in Context Mapping 70

Summary 73

Chapter 5: Tactical Design with Aggregates 75

Why Used 76

Aggregate Rules of Thumb 81

Modeling Aggregates 88

Summary 98

Chapter 6: Tactical Design with Domain Events 99

Designing, Implementing, and Using Domain Events 100

Event Sourcing 107

Summary 109

Chapter 7: Acceleration and Management Tools 111

Event Storming 112

Managing DDD on an Agile Project 125

Timeboxed Modeling 132

Summary 136

References 137

Index 139