Software Architecture in Practice

7. Mental Model for Applications

Domain Driven Design 

• Helps classify components into logical categories to orchestrate certain behaviors 
• Works well with modeling business applications

Domain Driven Design Objects 

• Entity - objects with distinct identities and has a lifecycle 
• Value Objects - immutable objects that has value but has no unique identity 
• Domain Event - a record of something that happened in the software, can be used to publish to components that are interested 
• Aggregate - cluster of objects that can be related and treated as a single unit 
• Service - business logic operations that are stateless 
• Repositories - deals with the entities and value objects lifecycle 
• Factories - encapsulates creation of complex entities, aggregates and value objects