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What is Domain-Driven Design (DDD)?
sobes.tech AI
Answer from AI
Domain-Driven Design (DDD) is an approach to software development that focuses on a deep understanding of the subject area (domain) and modeling it in code. The main goal is to create a system that accurately reflects business logic and is easily adaptable to changes in the domain.
Key concepts of DDD:
- Ubiquitous Language: A common language used by all project participants (developers, domain experts, users) for communication about the domain. This language is then reflected in the code.
- Domain Model: An object model representing business concepts, relationships, and rules of the domain.
- Bounded Context: Explicit definition of boundaries within which the domain model has a specific meaning. Different contexts can have different models for the same concept.
- Aggregates: A group of related domain objects considered as a single unit to ensure data consistency. An aggregate has a root object through which all operations are performed.
- Entities: Objects that have a unique identity throughout their lifecycle, regardless of their attributes.
- Value Objects: Objects defined by their attributes rather than a unique identity. They are immutable.
- Domain Events: Significant occurrences within the domain that may be of interest to other parts of the system.
- Repositories: Objects that encapsulate data access logic for aggregates.
- Services: Operations that do not naturally belong to entity or value object classes. These include domain services and application services.
Applying DDD helps create more understandable, maintainable, and flexible systems, especially for complex domains.