Refactoring towards the ubiquitous language

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Slides from my Euricom Spain 2013 talk on the ubiquitous language, with an example of refactoring from an anemic model to a more rich domain model.

Refactoring towards the
ubiquitous language
@JefClaes – jefclaes.be

When a customer
moves, we want to
send him an email.

UPDATE tbl_customer
SET street = …
WHERE id = …

We have forgotten how to talk
• Database
• Framework
• ORM
• Tools
• Code generation
• UI technology
• ...

Faster and less error-prone
communication

Example
Our business has customers. A customer must
have a customer number, an address and an
email address. A customer can move to a new
address. When a customer moves, we want to
send them an email.

Work the language,
make the implicit explicit

Disclaimer
CRUD can be fine too.
Learn where the value is in your system.

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Refactoring towards the ubiquitous language

1. Refactoring towards the ubiquitous language @JefClaes – jefclaes.be

2. What language?

3. When a customer moves, we want to send him an email.

4. UPDATE tbl_customer SET street = … WHERE id = …

6. It’s us, not them

7. We have forgotten how to talk • Database • Framework • ORM • Tools • Code generation • UI technology • ...

10.

11.

12.

13.

14.

15. = =

16. The ubiquitous language

17. Better understanding of ‘the business’

18. Faster and less error-prone communication

19. Less documentation!

20. Code can be understood by everyone

21. Example Our business has customers. A customer must have a customer number, an address and an email address. A customer can move to a new address. When a customer moves, we want to send them an email.

22. Can we tell this story in code?

23. Before

24. After

25. Before

26. Before

27. After

28. After

29. After

30. Work the language, make the implicit explicit

31.

32. Disclaimer CRUD can be fine too. Learn where the value is in your system.