2011-05-22 Domain Driven Design
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Domain Driven Design (DDD) is a software development approach that involves focusing on the core domain and domain logic. It uses a ubiquitous language to ensure all elements of the system share a common conceptual model. The key elements of DDD include entities that have identities, value objects without identities, aggregates that group related entities and values, factories that construct complex objects, services for non-domain operations, modules that represent subdomains, and repositories that manage entities and aggregates storage and retrieval. The goal is to build software that is an explicit model of the domain it is describing.
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2011-05-22 Domain Driven Design
- 1. Domain Driven Design Ismael Santos @ifsantosrs
- 2. What is DDD?
- 3. What is DDD?
- 4. Domain X Software ● Do you know what the software is talking about?
- 6. Ubiquitous Language ● Is a programming language? ● Is an human language? ● WTF is it??
- 8. Model Driven Design ● Is important to divide the application domain ● The application construction must explain about the domain
- 9. Entities ● Everything that needs an identity ● Needs to be uniquely referenced ● Examples: Order, Product, Route, etc.
- 10. Value Objects ● Elements that dont need an identity ● Fast life-cicle ● Can be constant ● Example: Delivery address, Credit card number, Font type, etc.
- 11. Agregates ● Encapsulate Entities and Value Objects from a comnon subject, to give easy acess to useful data Entity Value Object Value Object Entity Agregate
- 12. Factories ● Used to construct some elements when it is complex. ● Used in Agregates and Vaue objects ● Encapsulate the contruction process
- 13. Services ● Is an operation that is not part of any Entity or Value Object ● Stateless ● Follow the Ubiquitous Language
- 14. Modules ● Are like chapters from a story ● Are about model, not about code
- 15. Repositories ● Used to store/retieve Entities and Agregates ● Is centralized
- 16. Global vision Ubiquitous Language Model Driven Design Services Modules Value Objects Entities Factory Agregate Repository
- 17. References ● http://domaindrivendesign.org/resources/what_is_ddd ● http://en.wikipedia.org/wiki/Domain-driven_design ● http://www.infoq.com/minibooks/domain-driven-design-quickly ● http://vimeo.com/3545313 ● Java Magazine, ed. 87
- 18. Feel free to DDD! Thank you!