Domain Driven Design

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Domain Driven Design

• Strategic DDD vs Tactical DDD

Strategic DDD

도메인에 대한 경계를 도입. 하나의 도메인당 한개의 Bounded Context

도메인이란?

어플리케이션에서의 실행영역 ex) Online Food Ordering

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Tactical DDD

A.) Aggregate: Group of entities that are logically related.

B.) Aggregate root: Root entity to keep the aggregate in a consistent state.

C.) Entity: Core domain objects.

D.) Value object: Used to bring context to the value.

E.) Domain Event: Used to decouple the different domains. It will notify the other domains based on result of business logic.

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Order Service 도메인 로직 컴포넌트 설계

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• Value Objects는 불변 (final)
• 엔터티들을 unique indentifier를 가진다
• 엔터티들은 변할수있고 비지니스로직에 기반한 상태변화 메소드들을 가진다.

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Entity Classes

1. An entity class can act as an aggregate root, and in that case, forcing all business invariants is the responsibility of that entity
2. An entity class contains the methods to complete critical business rules.
3. An entity must have a unique identifier.

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common -> common-domain

order-domain -> order-domain-core

-> order-application-service