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Why Domain Driven Design

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This week, Michael asks his customers about their anemic domain model, Allen talks in front of people, and Joe plays Rocket League as we begin our dive into understanding domain driven design.

Are you reading this episode’s show notes via your podcast player? You can find this episode’s full show notes at http://www.codingblocks.net/episode58.

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Domain Driven Design (DDD)

Why Domain Driven Design

  • What is the “domain”?
  • Set of principles and patterns to solve difficult problems
  • Clear and testable code that represents the domain
  • Interact with domain experts
  • In contrast to some approaches, you focus on a single domain at a time
  • Business logic is in one area

Drawbacks?

  • Need access to the domain experts
  • Time and effort, initially, much higher
  • Have to really think about how to isolate domain logic from other portions of your application
  • Learning curve – as with any new framework / pattern
  • No reason to do it in place of a simple crud app – if there’s not complex business domains to manage, this is overkill
  • Gotta get buy in from upper management
  • Is DDD anti-agile? http://stackoverflow.com/questions/39245741/what-makes-domain-driven-design-worthwhile

Ubiquitous Language

  • One of the most important aspects of DDD
  • “Client” means something totally different to a UI developer vs a domain expert working with customers
  • Common vocabulary MUST be established – and all communications should be carried out with that vocabulary
  • Need to focus on how the domain works – nothing regarding implementation details

Getting into the details…a bit

  • Bounded context – specific responsibility with explicit boundaries that separate it from other parts of a system
    • “Explicitly define the context within which a model applies…Keep the model strictly consistent within these bounds, but don’t be distracted or confused by issues outside” – Eric Evans
  • Terms:
    • Problem domain – the specific problem you’re working on solving
    • Core domain – key to the customer’s business – cannot be outsourced
    • Sub domain – separate pieces your software must interact with
    • Context mapping – identifying bounded contexts and their relationships to one another
    • Shared kernel – part of the model that is shared by more than one team – will not change without collaboration between teams

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