Domain-Driven Design Principles
- Ubiquitous Language
- Shared language between developers and domain experts
- Consistent terminology across code, documentation, and conversations
- Bounded Contexts
- Clear boundaries that define where models apply
- Each context has its own ubiquitous language and model
- Context Mapping
- Explicit relationships between bounded contexts
- Strategies for integration across context boundaries
- Strategic Design
- Core Domain – Most valuable and complex part of the system
- Supporting Domains – Essential but not differentiating
- Generic Domains – Can be outsourced or use off-the-shelf solutions
- Tactical Design Patterns
- Entities – Objects with identity and lifecycle
- Value Objects – Immutable objects defined by attributes
- Aggregates – Cluster of entities and value objects with a root entity
- Domain Events – Objects that capture occurrences in the domain
- Repositories – Provide collection-like interfaces for accessing domain objects
- Factories – Encapsulate complex object creation
- Services – Operations that don’t belong to entities or value objects
- Domain Model
- Rich, behavior-focused model of the domain
- Encapsulates business rules and processes
- Anti-corruption Layer
- Isolates models from external systems
- Translates between different contexts
- Continuous Integration
- Frequent merging of models to maintain consistency
- Regular validation of the model against domain requirements
- Model-Driven Design
- Implementation closely reflects the domain model
- Code organization mirrors conceptual organization
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