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For software developers of all experience levels looking to improve their results, and design and implement domain-driven enterprise applications consistently with the best current state of professional practice, Implementing Domain-Driven Design will impart a treasure trove of knowledge hard won within the DDD and enterprise application architecture communities over the last couple decades. Randy Stafford, Architect At-Large, Oracle Coherence Product Development
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This book is a must-read for anybody looking to put DDD into practice.
Udi Dahan, Founder of NServiceBus
Implementing Domain-Driven Design presents a top-down approach to understanding domain-driven design (DDD) in a way that fluently connects strategic patterns to fundamental tactical programming tools. Vaughn Vernon couples guided approaches to implementation with modern architectures, highlighting the importance and value of focusing on the business domain while balancing technical considerations.
Building on Eric Evans seminal book, Domain-Driven Design, the author presents practical DDD techniques through examples from familiar domains. Each principle is backed up by realistic Java examplesall applicable to C# developersand all content is tied together by a single case study: the delivery of a large-scale Scrum-based SaaS system for a multitenant environment.
The author takes you far beyond DDD-lite approaches that embrace DDD solely as a technical toolset, and shows you how to fully leverage DDDs strategic design patterns using Bounded Context, Context Maps, and the Ubiquitous Language. Using these techniques and examples, you can reduce time to market and improve quality, as you build software that is more flexible, more scalable, and more tightly aligned to business goals.
- Getting started the right way with DDD, so you can rapidly gain value from it
- Using DDD within diverse architectures, including Hexagonal, SOA, REST, CQRS, Event-Driven, and Fabric/Grid-Based
- Appropriately designing and applying Entitiesand learning when to use Value Objects instead
- Mastering DDDs powerful new Domain Events technique
- Designing Repositories for ORM, NoSQL, and other databases
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With Implementing Domain-Driven Design, Vaughn has made an important contribution not only to the literature of the Domain-Driven Design community, but also to the literature of the broader enterprise application architecture field. In key chapters on Architecture and Repositories, for example, Vaughn shows how DDD fits with the expanding array of architecture styles and persistence technologies for enterprise applicationsincluding SOA and REST, NoSQL and data gridsthat has emerged in the decade since Eric Evans seminal book was first published. And, fittingly, Vaughn illuminates the blocking and tackling of DDDthe implementation of entities, value objects, aggregates, services, events, factories, and repositorieswith plentiful examples and valuable insights drawn from decades of practical experience. In a word, I would describe this book as thorough. For software developers of all experience levels looking to improve their results, and design and implement domain-driven enterprise applications consistently with the best current state of professional practice, Implementing Domain-Driven Design will impart a treasure trove of knowledge hard won within the DDD and enterprise application architecture communities over the last couple decades.
Randy Stafford, Architect At-Large, Oracle Coherence Product Development
Domain-Driven Design is a powerful set of thinking tools that can have a profound impact on how effective a team can be at building software-intensive systems. The thing is that many developers got lost at times when applying these thinking tools and really needed more concrete guidance. In this book, Vaughn provides the missing links between theory and practice. In addition to shedding light on many of the misunderstood elements of DDD, Vaughn also connects new concepts like Command/Query Responsibility Segregation and Event Sourcing that many advanced DDD practitioners have used with great success. This book is a must-read for anybody looking to put DDD into practice.
Udi Dahan, Founder of NServiceBus
For years, developers struggling to practice Domain-Driven Design have been wishing for more practical help in actually implementing DDD. Vaughn did an excellent job in closing the gap between theory and practice with a complete implementation reference. He paints a vivid picture of what it is like to do DDD in a contemporary project, and provides plenty of practical advice on how to approach and solve typical challenges occurring in a project life cycle.
Alberto Brandolini, DDD Instructor, Certified by Eric Evans and Domain Language, Inc.
Implementing Domain-Driven Design does a remarkable thing: it takes a sophisticated and substantial topic area in DDD and presents it clearly, with nuance, fun and finesse. This book is written in an engaging and friendly style, like a truste...
Vaughn Vernon is a veteran software craftsman, with more than 25 years of experience in software design, development, and architecture. Vaughn is a thought leader in simplifying software design and implementation using innovative methods in distributed computing. Vaughn has been programming with object-oriented languages since the 1980s and applying the tenets of Domain-Driven Design since his Smalltalk domain modeling days in the early 1990s. His experience spans a wide range of business domains, including aerospace, environmental, geospatial, insurance, medical and health care, and telecommunications. He has also succeeded in technical endeavors creating reusable frameworks, libraries, and implementation acceleration tools. Vaughn consults and speaks internationally, and has taught his Implementing Domain-Driven Design classes on multiple continents. You can read more about his latest efforts at www.VaughnVernon.co and follow him on Twitter here: @VaughnVernon.
About the Author xxxiii
Guide to This Book xxxv
Chapter 1: Getting Started with DDD 1
Can I DDD? 2
Why You Should Do DDD 6
How to Do DDD 20
The Business Value of Using DDD 25
The Challenges of Applying DDD 29
Fiction, with Bucketfuls of Reality 38
Chapter 2: Domains, Subdomains, and Bounded Contexts 43
Big Picture 43
Why Strategic Design Is So Incredibly Essential 53
Real-World Domains and Subdomains 56
Making Sense of Bounded Contexts 62
Sample Contexts 72
Chapter 3: Context Maps 87
Why Context Maps Are So Essential 87
Chapter 4: Architecture 113
Interviewing the Successful CIO 114
Hexagonal or Ports and Adapters 125
Representational State TransferREST 133
Command-Query Responsibility Segregation, or CQRS 138
Event-Driven Architecture 147
Data Fabric and Grid-Based Distributed Computing 163
Chapter 5: Entities 171
Why We Use Entities 171
Unique Identity 173
Discovering Entities and Their Intrinsic Characteristics 191
Chapter 6: Value Objects 219
Value Characteristics 221
Integrate with Minimalism 232
Standard Types Expressed as Values 234
Testing Value Objects 239
Persisting Value Objects 248
Chapter 7: Services 265
What a Domain Service Is (but First, What It Is Not) 267
Make Sure You Need a Service 268
Modeling a Service in the Domain 272
Testing Services 281
Chapter 8: Domain Events 285
The When and Why of Domain Events 285
Modeling Events 288
Publishing Events from the Domain Model 296
Spreading the News to Remote Bounded Contexts 303
Event Store 307
Architectural Styles for Forwarding Stored Events 312
Chapter 9: Modules 333
Designing with Modules 333
Basic Module Naming Conventions 336
Module Naming Conventions for the Model 337
Modules of the Agile Project Management Context 340
Modules in Other Layers 343
Module before Bounded Context 344
Chapter 10: Aggregates 347
Using Aggregates in the Scrum Core Domain 348
Rule: Model True Invariants in Con...