abp/docs/en/Domain-Driven-Design.md

Domain Driven Design

What is DDD?

ABP framework provides an infrastructure to make Domain Driven Design based development easier to implement. DDD is defined in the Wikipedia as below:

Domain-driven design (DDD) is an approach to software development for complex needs by connecting the implementation to an evolving model. The premise of domain-driven design is the following:

• Placing the project's primary focus on the core domain and domain logic;
• Basing complex designs on a model of the domain;
• Initiating a creative collaboration between technical and domain experts to iteratively refine a conceptual model that addresses particular domain problems.

Layers

ABP follows DDD principles and patterns to achieve a layered application model which consists of four fundamental layers:

• Presentation Layer: Provides an interface to the user. Uses the Application Layer to achieve user interactions.
• Application Layer: Mediates between the Presentation and Domain Layers. Orchestrates business objects to perform specific application tasks. Implements use cases as the application logic.
• Domain Layer: Includes business objects and the core (domain) business rules. This is the heart of the application.
• Infrastructure Layer: Provides generic technical capabilities that support higher layers mostly using 3rd-party libraries.

DDD mostly interest in the Domain and the Application layers, rather than the Infrastructure and the Presentation layers.

Contents

See the following documents to learn what ABP Framework provides to you to implement DDD in your project.

• Domain Layer
  • Entities & Aggregate Roots
  • Repositories
  • Domain Services
  • Value Objects
  • Specifications
• Application Layer
  • Application Services
  • Data Transfer Objects (DTOs)
  • Unit of Work