Taming the Monolith - Are Microservices just an Implementation Detail? The slides of my presentation at the Microservices Meetup Hamburg on July 13th, 2015, hosted by Adobe Systems Engineering GmbH. Event details: http://www.meetup.com/de/Microservices-Meetup-Hamburg/events/220839035/

1. TAMING THE MONOLITH
Are microservices just an implementation detail?
Microservice Meetup Hamburg | July 13th, 2015 | Dennis Traub | @DTraub

2. EVERYBODY TALKS ABOUT MICROSERVICES
2

3. http://technabob.com/blog/wp-content/uploads/2014/12/back-to-the-future-delorean-dmc-12-time-machine-conversion-by-bobs-prop-shop-7-620x465.jpg
Back in the Day …

5. https://i2.wp.com/www.aydinstone.com/vic20.jpg

6. http://www.weihenstephan.org/~michaste/pagetable/64er/64er_1984-04.jpg | http://www.c64-wiki.de/images/thumb/4/43/listing_shape.jpg/300px-listing_shape.jpg

7. http://www.teslamotors.com/sites/default/files/images/model-s/gallery/interior/hero-01-LHD.jpg
Fast-Forward 30 Years

8. - A sphere of knowledge, influence, or activity -
- What an organisation does, and the world it does it in -
DOMAIN

9. - A system of abstractions describing selected aspects of a Domain -
- Used to solve problems related to that Domain -
MODEL

10. Sit down with the experts and listen

11. http://wikimediafoundation.org/wiki/File:Commodore-VIC-20-FL.jpg

12. http://wikimediafoundation.org/wiki/File:Commodore-VIC-20-FL.jpghttp://backgrounds.1nova.com/wp-content/uploads/sites/27/2015/02/One-Ring-to-Rule-them-All.jpg
One Model to Rule Them All

13. - A language structured around the Domain Model -
- Used by all team members and throughout the code -
UBIQUITOUS LANGUAGE

14. There is no such thing as a
Ubiquituous Language
… at least not company-wide …

15. Customer

16. Customer
Marketing
Target Group

17. Customer
Marketing
Target Group
Website
Visitor

18. Customer
Marketing
Target Group
Website
Visitor
Shopping Cart
Buyer

19. Customer
Recipient
ShippingMarketing
Target Group
Website
Visitor
Shopping Cart
Buyer

20. Customer
Recipient
ShippingMarketing
Target Group
Hotline
Caller
Website
Visitor
Shopping Cart
Buyer

21. Customer
Recipient
ShippingMarketing
Target Group
Hotline
Caller
Website
Visitor
Shopping Cart
Buyer
Purchasing
Customer

22. Customer
Recipient
ShippingMarketing
Target Group
Hotline
Caller
Website
Visitor
Shopping Cart
Buyer
Purchasing
Customer

23. Customer
Recipient
ShippingMarketing
Target Group
Hotline
Caller
Website
Visitor
Shopping Cart
Buyer
Purchasing
Customer

24. - An explicit boundary within which a Domain Model exists -
- Inside, all terms have a specific meaning -
- They are part of the Ubiquitous Language -
BOUNDED CONTEXT

25. KEY ATTRIBUTES OF A BOUNDED CONTEXT
High Cohesion
Loose Coupling
Represents Business Capability
Context-specific Model

26. KEY ATTRIBUTES OF A MICROSERVICE
High Cohesion
Loose Coupling
Represents Business Capability
Context-specific Model

28. Business Logic
Data Access
Presentation
our “Architecture”

29. Business Logic
Data Access
Presentation
our “Architecture”

30. Business Logic
Data Access
Presentation
our “Architecture”

31. Business Logic
Data Access
Presentation
our “Architecture”

32. Enterprise Service Bus

33. Orchestration
vs. Choreography

34. http://latimesblogs.latimes.com/.a/6a00d8341c630a53ef01538f58370b970b-pi
Orchestration

35. Choreography
http://sunny.moorparkcollege.edu/~dance/Stepping-Stones-2004-309.jpg

36. Key Takeaways:

37. Don’t model reality.
Model useful abstractions.

38. Don’t build a model.
that works for everyone.

39. Don’t design a
one-size-fits-all architecture.

40. So, what are
Microservices all about?

41. THANK YOU!
Dennis Traub | @DTraub | ThoughtWorks.com