Lucas' Talk about domain driven design at the FrOSCon from 23th and 24th of August

1. Escaping the
Tower of Babel
Domain Driven Design & NoSQL

2. Escaping the
Tower of Babel
Domain Driven Design & NoSQL

3. vI
class SpaceShuttle
end
!
class Astronaut
end

4. Domain Driven Design
Eric Evans
• Find an ubiquitous language
• Every person involved understands the
language
• The language is based on the domain

5. Domain Driven Design
Iterative Development
Close relationship
between
devs & domain experts

6. Hi.
I’m Lucas.

7. From Köln / Cologne

8. I work for
ArangoDB GmbH

9. We build
ArangoDB

10. ArangoDB
is an Open Source
NoSQL Database

11. But what is NoSQL?

12. NoSQL
SQL

13. Not only SQL
SQL

14. What is NoSQL?
What is SQL?
What is a relational
algebra?
What is a relation?
Not SQL
A relational algebra
An algebra on relations

15. {(Alice, 1983-07-1, 1)
(Bob, 2014-03-19, 2)}

16. name birthday city
Alice 1983-07-1 1
Bob 2014-03-19 2

17. Disconnect
Ownership
I
v
type: spaceshuttle
name: alice…

18. Entity Value Object Service
Identified by ID Value What it does
State Mutable Immutable Stateless

19. + Factories
+ Repositories
+ Aggregates

20. DENORMALIZATION

21. Lift the
restriction
• Tuples containing other Tuples
• Tuples with arbitrary attributes

22. Space Shuttle
Parts

23. Document
Space Shuttle
Store
Parts

24. Itype:
spaceshuttle
vname:
alice
astronaut: 1
spaceshuttle: 3

25. JOINS

26. Alice Ownership SpaceShuttle

27. Alice Ownership SpaceShuttle Graph
Database

28. Alice Ownership
SpaceShuttle
Parts

29. Alice Ownership
SpaceShuttle
Parts
I’m a
document!

30. Alice Ownership
SpaceShuttle
Parts
Me too!

31. Alice Ownership
SpaceShuttle
Parts

32. Multi Model
SpaceShuttle
Alice Database
Ownership
Parts

33. Disconnect
Ownership
I
v
type: spaceshuttle
name: alice…

34. Itype:
spaceshuttle
vname:
alice
Ownership
since:
2003

35. Explain
graphs.

36. Learn
about
the
domain.

37. Find
the
common
language.

38. Build
one
model
for
everyone
involved.

39. Evolve
the
model
alongside
the
implementation

40. moonglum
moonbeamlabs
arangodb.org
Explain graphs.
Learn about the domain.
Find the common language.
Build one model for everyone involved.
Evolve the model alongside the implementation