DDD lightning talk.

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?

5. Ubiquitous Language

6. Ubiquitous Language
● Is a programming language?
● Is an human language?
● WTF is it??

7. Ubiquitous Language

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!