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1. #Data driven design vs domain driven design software#
2. #Data driven design vs domain driven design code#

This right here sounds like we're talking about designing intention revealing interfaces. "The interface of the Entity consists of the functions that implement the Critical Business Rules that operate on that data" It also sounds a lot like we're talking about aggregates (a very specific type of entity) because in aggregate design, we put a lot of effort into identifying the exact aggregate boundaries in order to keep it small. I like this definition! The critical business data is comparable to domain logic/business rules in DDD. "An Entity is an object within our computer system that embodies a small set of critical business rules operating on Critical Business Data." Starting from the center of the layered architecture, we have the concept of entities.

#Data driven design vs domain driven design software#

Ironic to the essence of DDD, it's the lack of a shared understanding towards the tools that we use in our domain (software development, that is) that makes it difficult for us to have conversations about software design and architecture.īecause we so regularly involve topics from both DDD and Clean Architecture on this blog (I'll refer to Clean Architecture as CA from now on), I think it would be a good idea to attempt to identify the mapping between the two. Some developers see domain services and application services as the same thing.

#Data driven design vs domain driven design code#

A generally cohesive group of code can be called a component.įor just about every scenario, and at every layer of the layered architecture, there exists a construct or design pattern we can use to solve our problems.Įvery developer has a different name for these constructsĭepending on who you ask, a Use Case might only be known to someone as an application service. For abstracting the challenges of retrieving and persisting data, we have repositories. Over the past year or so, I've realized that in software development,įor validation logic, we have Value Objects. Uncle Bob wrote Clean Architecture in 2017 and summarized his research on what constitutes a clean architecture, also using a layered architecture with a domain layer in the center.Įven through there's some overlap between the concepts that both of these books introduced, there's a little bit of confusion on the definitions of the constructs. I spent a lot of time doing rework, writing untestable code, trying to invent my own (bad) abstractions, and putting all my business logic into anemic services.Įventually, I ended up reading Clean Architecture by Uncle Bob and then Domain-Driven Design by Eric Evans.ĭomain-Driven Design, initially written in 2003 by Eric Evans, introduced new approaches towards designing software by using a layered architecture with a rich domain model in the center. Before I got into software design and architecture, my code was hurting 🤕.