To become a software crafter…Or die in the attempt.

Patterns, Principles and Practices of DDD

Patterns, Principles, and Practices of Domain-Driven Design was written by Scott Milett and Nick Tune. It gives a holistic view of DDD, from strategic to tactical patterns, and provides many examples to explain the concepts.

This book was presented to me by Bruno Boucard in this way : « It’s a very complete and modern view on DDD, and very few people have read it .» I agree, and it’s a shame.


Why have so few people read it?

The more I read about DDD, the more I wonder if it is wise to explain all the DDD concepts, including examples, at once. It produces huge books (this one is 792 pages) contributing to the idea that DDD is complicated. It could discourage newcomers just by its size.

Also concepts and examples  do not deteriorate at the same rate.

Explanations about strategic and tactical patterns were quite the same as in the Blue Book. A few building blocks were added by the authors like Domain Events, but nothing really new emerges. It stays worthwhile to write about it, this content can stay up to date for many years.

DDD implementations on the other hand evolve a lot. The emergence of CQRS/ES and NoSql storage, the hexagonal architecture, and other practices have changed the way we implement DDD solutions in the last decade. These solutions did not exist in the Blue Book, and we can hope in 10 years it will be outdated by better alternatives.


But is it always good to have examples?

It is really hard to show examples, because DDD is contextual. It is courageous to show examples anyway, but I would not push them into production. I don’t blame the authors though, they wrote disclaimers explaining it is short examples for learning purpose.

My point is, it was interesting to write such a complete book, and I find it’s a shame it will be half outdated when we’ll find better way to implement DDD. Maybe it would have serve the authors to write better examples in a dedicated book, and keep another book to stay focus on concept explanations.


Why you should read it anyway?

It is still a must read to have a modern understanding of DDD. It covers everything from integrating bounded contexts to implementing an event sourced aggregate and much more.

If you’re already familiar with DDD, it will improve your knowledge. If not, it is a very good start, even if you don’t grab all the subtleties at first.



Another article kindly reviewed by Brian Gibson.

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