Domain Driven Design
- Model the application thinking first about the
business rules
- Differently from Clean Architecture, the Domain layer can call the Infrastructure layer
Ubiquitous Language
- A universal language that developers and business experts understand
- It's a mix between the
business experts jargon and the technical experts jargon
Bounded Context
- A context to which the definitions of the system apply
- A
Context Map is a visual representation of the system and its dependencies
- A solution to separate the contexts is to divide them by package or as a microservice
Building Blocks
- Entity
- Value Object
- Repository
- Factory
- Service
Business Invariant
- A validation relative to the business rule
- E.g., a student cannot contain more than 2 phone numbers
Aggregate Root
- An
entity (e.g., a student) that aggregates various other value objects (e.g., email, phone)
- All the VOs must be manipulated by means of the
aggregate root. This guarantee the validation and consistency of the data
- The aggregate root can be in the
domain layer or infra layer