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.

Technologie Business

Refactoring towards the
ubiquitous language
@JefClaes – jefclaes.be

What language?

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

UPDATE tbl_customer
SET street = …
WHERE id = …

It’s us, not them

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

= =

The ubiquitous language

Better understanding
of ‘the business’

Faster and less error-prone
communication

Less documentation!

Code can be understood
by everyone

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.

Can we tell this story in code?

Before

After

Before

Before

After

After

After

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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"I see eyes in my soup": How Delivery Hero implemented the safety system for ...

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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 = …

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6. It’s us, not them

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

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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?

30. Work the language, make the implicit explicit

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

Notes de l'éditeur

Loket bedienden zoveel betalen
Save us form boilerplate
Data
Something that acts on that data