Applying Domain-Driven Design and Patterns: With Examples in C# and .NET
Product Author Bios
Jimmy Nilsson owns and runs the Swedish consulting company JNSK AB. He has written numerous technical articles and two books. He has also been training and speaking at conferences, but above everything else, he is a developer with almost 20 years of experience (www.jnsk.se/weblog/).
“[This] is a book about design in the .NET world, driven in an agile manner and infused with the products of the enterprise patterns community. [It] shows you how to begin applying such things as TDD, object relational mapping, and DDD to .NET projects...techniques that many developers think are the key to future software development.... As the technology gets more capable and sophisticated, it becomes more important to understand how to use it well. This book is a valuable step toward advancing that understanding.”
–Martin Fowler, author of Refactoring and Patterns of Enterprise Application Architecture
Patterns, Domain-Driven Design (DDD), and Test-Driven Development (TDD) enable architects and developers to create systems that are powerful, robust, and maintainable. Now, there’s a comprehensive, practical guide to leveraging all these techniques primarily in Microsoft .NET environments, but the discussions are just as useful for Java developers.
Drawing on seminal work by Martin Fowler (Patterns of Enterprise Application Architecture) and Eric Evans (Domain-Driven Design), Jimmy Nilsson shows how to create real-world architectures for any .NET application. Nilsson illuminates each principle with clear, well-annotated code examples based on C# 1.1 and 2.0. His examples and discussions will be valuable both to C# developers and those working with other .NET languages and any databases–even with other platforms, such as J2EE. Coverage includes
· Quick primers on patterns, TDD, and refactoring
· Using architectural techniques to improve software quality
· Using domain models to support business rules and validation
· Applying enterprise patterns to provide persistence support via NHibernate
· Planning effectively for the presentation layer and UI testing
· Designing for Dependency Injection, Aspect Orientation, and other new paradigms
42 of 44 people found the following review helpful
Unifying Tome for Domain Driven Design and Implementation with .NET,
This review is from: Applying Domain-Driven Design and Patterns: With Examples in C# and .NET (Hardcover)I was surprised that this book slipped under my radar for almost 3 months. I've been on the lookout for just such a unifying tome of knowledge that relates patterns and domain-driven design (DDD) to a practical .NET example for quite some while. The book delivers well on its promises, significantly surpassing the only other real competitor, Foundations of Object-Oriented Programming Using .NET 2.0 Patterns. The pros and cons, as I see them, are outlined below:
* Combines the ideas of Domain Driven Design (Evans) with Patterns of Enterprise Application Architecture (Fowler). These books are pretty much mandatory reading prior to diving into this book.
* Draws upon a myriad of other well-known sources, including materials from Refactoring to Patterns and the GoF, work from Johnson and Lowy, as well as a rare reference to Naked Objects. The more experienced and better read you are, the more this stuff will make sense.
* Rare .NET coverage... Read more
23 of 26 people found the following review helpful
"Down to Earth" DDD with "real-world" examples.,
This review is from: Applying Domain-Driven Design and Patterns: With Examples in C# and .NET (Hardcover)I was expecting this book for a looong time. For those who are new to DDD and want to be a good practitioner, I think this is a must read. The reason is not only that there are not many books in this topic (check out Eric Evan's DDD book if you haven't done so) but also there are not many "down-to-earth" books available. In this book you will find many "real world" examples where the author discusses the pros and cons. I like the books that discuss the trade-offs instead of the ones that try to give `universal" answers; as "it depends" is usually the answer to most of the questions in software development.
Apart from DDD, if you are also new to TDD, PEAA (Patterns of Enterprise Application Architecture by Martin Fowler, another great book), O/RM (NHibernate to be specific), Mocking frameworks (NMock to be specific), SOA, AOP etc you will find introductory level information in the book which is just enough to get started. With this book the link between the PEAA and DDD is... Read more
23 of 30 people found the following review helpful
Not for beginners,
This review is from: Applying Domain-Driven Design and Patterns: With Examples in C# and .NET (Hardcover)At the start the author says that this book is for "a wide target audience" and that if you don't have some knowledge of "object-orientation and C#" interest and enthusiasm will compensate for any lack of prior knowledge. I've been a web dev for over 10 years and know more than something about object-orientation etc. but this book is NOT for a beginner or even an intermediate programmer. On page 4 he starts discussion something called "case focus" with no definition and moves right into Domain-Driven Design Focus, again without explaining what this means. I found the book quite full of jargon and buzz words with a large presumption that one has already had experience in these topics. He says he is trying to build a bridge between users and developers. Most users will glaze over after the first chapter without any clue as to what he is talking about. If you are an advanced object-oriented programmer familiar with UML and other design technologies then this might be the book for you... Read more
› See all 24 customer reviews...
Online Sample Chapter
Table of Contents
About the Author xxv
Preface: Bridging Gaps xxxi
Part I: Background
Chapter 1: Values to Value 3
Chapter 2: A Head Start on Patterns 47
Chapter 3: TDD and Refactoring 77
Part II: Applying DDD
Chapter 4: A New Default Architecture 113
Chapter 5: Moving Further with Domain-Driven Design 143
Chapter 6: Preparing for Infrastructure 181
Chapter 7: Let the Rules Rule 229
Part III: Applying PoEAA
Chapter 8: Infrastructure for Persistence 279
Chapter 9: Putting NHibernate into Action 311
Part IV: What’s Next?
Chapter 10: Design Techniques to Embrace 349
Chapter 11: Focus on the UI 407
Part V: Appendices
Appendix A: Other Domain Model Styles 447
Appendix B: Catalog of Discussed Patterns 483
Bridging GapsOn the cover of this book is a picture of the Øresund Bridge that connects Sweden and Denmark. It seems that all software architecture books must have a bridge on the cover, but there are some additional reasons the bridge is appropriate for this book.
This bridge replaced a ferry that I took many times as a child. I enjoy very much driving over it even after dozens of times.
On a personal note, my father was on the team that built the highest parts of the bridge.
But beyond these, the main reason is that this book is very much about bridging gaps; bridging gaps between users and developers; bridging gaps between business and software; bridging gaps between logic and storage. Bridging gaps between "DB-guys" and "OO-guys"...
I will refrain from making a joke about the Bridge pattern GoF Design -Patterns. Hey, how geeky can a preface be?
Focus of This BookThe main focus of the book is how a Domain Model could be constructed to be clean, yet still be persistence-friendly. It shows what the persistence solution could look like for such a Domain Model and especially how to bridge that gap between the Domain Model and the database.
Put another way, my vision has been to provide a book that will put Eric Evans' Domain-Driven Design Evans DDD and Martin Fowler's Patterns of Enterprise Application Architecture Fowler PoEAA in context.
DDD might be perceived as a bit abstract. Therefore, more concrete examples are helpful regarding persistence, for example. Mine may be fairly basic, but it is a platform to start from. This book not only explains how to use the patterns, but also how the patterns are used in O/R Mappers, for example.
It has become very clear to me that "one size does not fit all" when it comes to architecture. Having said that, patterns have proven to be general enough to use and reuse in context after context.
The focus isn't on the patterns themselves, but this book uses patterns in every chapter as a tool and language for discussing different design aspects. A nice side effect is that patterns-ignorant readers will also gain some insight and interest into patterns along the way.
That also goes for TDD. Not all developers have become interested in this yet. I think it's especially common in the .NET community that TDD (just as patterns) is considered a niche technique at best, or it might even be totally unknown. Readers will learn how to apply TDD.
Why This Book?Writing my first book Nilsson NED was a really tough project on top of all my other ordinary projects and obligations. I was pretty sure I wouldn't write another, but the time came when I thought I had something to say that I couldn't leave unsaid.
My change of heart started when I read two recent books that inspired me and changed my thinking. First, there was Martin Fowler's Patterns of Enterprise Application Architecture Fowler PoEAA. This book inspired me to give the Domain Model pattern another try after having failed with several earlier attempts.
Then I read Eric Evans' book Domain-Driven Design Evans DDD. This book provided me with insights about how to think and act regarding development with a strong domain focus and with a certain style of how to apply the Domain Model pattern.
Another important influence was all that I learned from teaching my patterns course over a couple of years. As I interacted with students and the material evolved, I had insights myself.
My views of DDD transformed as I worked on an ambitious (though unfortunately unfinished) open source project called Valhalla, which I developed in collaboration with Christoffer Skjoldborg. (Christoffer did by far the most work.)
To summarize all this, I felt that a book that dealt more with application than theory was needed, but one that was based on solid ground, such as the DDD and PoEAA books. "Applying" feels close to my heart because I consider myself a developer above anything else.
Target AudienceThis book is aimed at a wide target audience. It will help if you have some knowledge of
- .NET or a similar platform
- C# or a similar language
- Relational databases; for example, SQL Server
However, interest and enthusiasm will compensate for any lack of prior experience.
I'd like to elaborate on my statement that the target audience is wide. First, we can think about the way we put people into platform boxes. The book should serve .NET people who want a more core-based approach than drag-till-you-drop (if I may use some weak generalizations). Java people should get something out of the discussions and examples of how to combine DDD and O/R Mapping.
I think the chosen language/platform is less and less important, so it feels a little strange to talk about .NET people and Java people. Let's try to describe the target audience by using another dimension. Then I think that the book is for developers, team leaders, and architects.
Choosing yet another dimension, I think there might be something in this book both for intermediate and advanced readers. There's probably also something for beginners.
Organization of This BookThe book is arranged in four parts: "Background," "Applying DDD," "Applying PoEAA," and "What's Next?"
Part I: Background
In this part, we discuss architecture and processes in general terms. There is a lot of emphasis on Domain Models and DDD Evans DDD. We also introduce patterns and TDD. The chapters include the following:
Chapter 1, "Values to Value": This chapter discusses properties of architecture and process to value for creating quality results when it comes to system development. The discussion is influenced by Extreme Programming.
Chapter 2, "A Head Start on Patterns": This chapter focuses on providing examples and discussions about patterns from different families, such as design patterns, architectural patterns and domain patterns.
Chapter 3, "TDD and Refactoring": Chapter 1 talks quite a lot about TDD and refactoring, but in this chapter there is more in-depth coverage with pretty long examples and also different flavors of TDD.
Part II: Applying DDD: In this part, it's time to apply DDD. We also prepare the Domain Model for the infrastructure, and focus quite a lot on rules aspects.
Chapter 4, "A New Default Architecture": This chapter lists a set of requirements of an example application, and a first-try model is created as a start for the coming chapters. A Domain Model-based architecture is used.
Chapter 5, "Moving Further with Domain-Driven Design": The requirements set up in the prior chapter are used in this chapter as the basis for slowly, with TDD, starting to build the Domain Model in a DDD-ish style.
Chapter 6, "Preparing for Infrastructure": Even though we try to push the infrastructure aspects as far off in the future as possible, it's good to think a little bit ahead and prepare the Domain Model for the infrastructure needs. In this chapter, there is a lot of discussion about pros and cons of Persistence Ignorant Domain Models.
Chapter 7, "Let the Rules Rule": This chapter talks about business rules in the form of validation and how a Domain Model-based solution can deal with the need for such rules, connecting back to the requirements
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