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37 lines
2.4 KiB
37 lines
2.4 KiB
# Domain Driven Design
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## What is DDD?
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ABP framework provides an **infrastructure** to make **Domain Driven Design** based development easier to implement. DDD is [defined in the Wikipedia](https://en.wikipedia.org/wiki/Domain-driven_design) as below:
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> **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:
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> - Placing the project's primary focus on the core domain and domain logic;
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> - Basing complex designs on a model of the domain;
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> - Initiating a creative collaboration between technical and domain experts to iteratively refine a conceptual model that addresses particular domain problems.
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## Layers & Building Blocks
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ABP follows DDD principles and patterns to achieve a layered application model which consists of four fundamental layers:
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- **Presentation Layer**: Provides an interface to the user. Uses the *Application Layer* to achieve user interactions.
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- **Application Layer**: Mediates between the Presentation and Domain Layers. Orchestrates business objects to perform specific application tasks. Implements use cases as the application logic.
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- **Domain Layer**: Includes business objects and the core (domain) business rules. This is the heart of the application.
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- **Infrastructure Layer**: Provides generic technical capabilities that support higher layers mostly using 3rd-party libraries.
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DDD mostly interest in the **Domain** and the **Application** layers, rather than the Infrastructure and the Presentation layers. The following documents explains the **infrastructure** provided by the ABP Framework to implement **Building Blocks** of the DDD:
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* **Domain Layer**
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* [Entities & Aggregate Roots](Entities.md)
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* [Repositories](Repositories.md)
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* [Domain Services](Domain-Services.md)
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* [Value Objects](Value-Objects.md)
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* [Specifications](Specifications.md)
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* **Application Layer**
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* [Application Services](Application-Services.md)
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* [Data Transfer Objects (DTOs)](Data-Transfer-Objects.md)
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* [Unit of Work](Unit-Of-Work.md)
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## Free E-Book: Implementing DDD
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See the [Implementing Domain Driven Design book](https://abp.io/books/implementing-domain-driven-design) as a **complete reference**. This book explains the Domain Driven Design and introduces explicit **rules and examples** to give a deep understanding of the **implementation details**. |