"This is not DDD you're looking for" talk at KanDDDinsky conference 2017 in Berlin #dddesign

1. This page is intentionally left
almost blank

2. This is not DDD
you’re looking for
@zimareff

3. Stackoverflow

4. Programmers Exchange

5. one more
“Answer”
question

7. interviews
q: What was the biggest
challenge with DDD?
A: SELECT N+1
problem…

9. This is not DDD you’re looking for

10. Domain
Model
Concise, manageable

11. Domain
Model
After a little while

12. Domain
Model
After some more time

13. Domain
Model
After three years in
production

14. Big ball of mud

15. it started so well!
Look, i have entities!
Here is my aggregate root!
My repositories are awesome!

16. it started so well!

17. Cargo Cult
Repository
Aggregate Root
Value Object
Domain Service

18. This is not how DDD works

19. bounded context
ubiquitous language
context map

21. Flashback
“Answer”
question

22. Bounded Context

23. bounded Context is where
ubiquitous language lives

25. Context
The bandage was wound around the
wound.
We must polish the Polish.
he could lead if he would get the lead.
The soldier decided to desert his dessert in
the desert.
Since there is no time like the present, he
thought it was time to present the present.
http://www.mtmlinguasoft.com/context-is-everything-especially-in-translation/

26. one word - different meaning

27. dry is for the bounded context, not
for the entire system
eric evans

28. domain knowledge

29. requirements

30. Book
about requirements

31. meetings

32. meetings

33. big meetings

34. different languages

35. now i know
can write some
requirements

36. wysiati
what you see is all
there is

37. developer’s view

38. support’s view

39. one more meeting

40. deeper insight

41. illusion of competence
anchor
rejection of facts
oversimplification

42. examples

43. gather domain knowledge
challenge domain knowledge
take a break
get more domain knowledge
challenge your model
repeat

45. so, what’s with orm?

46. don’t care
aggregate boundaries
cqrs - split read and write models
state pattern
event sourcing

47. may the force of ddd
be with you