The concept

• Code must be build using business' language

• Exchanges with Domain Experts are frequent and the language evolves with the understanding

Benefits

• Business understanding get refined with code

• Code helps understanding the business

• Code sustainability

• Code is understandable by business experts

Overview

Many terms are intentionally omitted

Construction blocs

• Entities : An object that is defined by it's identity rather than its attributes.

• Value objects : An object that has attributes but no identity.

• Being an entity or a value object is context dependant

Blocs grouping

• Aggregates : A collection of objects that are bound together by a root entity

• Bounded context : A business context holding all its necessary and sufficient data and logic to perform the business.

Persistancy and Building

• Services : They are the business logic in the domain that are not a natural part of an Entity or Value Object.

• Factories : They are responsible of creating and managing other complex objects, like aggregates.

• Repositories : Encapsulate persistence and retrieval of domain objects. Act as collections.

Component integration

• Context map : Documents links between two or more bounded context

• Anticorruption layer : It is a mean to link two bounded contexts

• Core domain : Where the business value resides

• Generic subdomains : Domains with (technical) complexity but with low business value.

The Big Picture

24 concepts, 32 links, thousands pages

To Go Further