Dennis Traub's talk from the first GOTO Night in Cologne. Domain-Driven Design changed the way we reason about large software systems. Modern practices, tools and technologies like continuous delivery, NoSQL, and cloud-based virtualization allow the creation of fine-grained systems to solve the specific problems at hand. Having DDD in mind and technical expertise at our hands, with microservice architectures we can build complex systems that reflect our businesses’ complex realities and are easy to change at the same time. This talk will show what DDD and microservice architectures have in common and how you can use both to create software systems that fit your domain.

1. TAMING THE MONOLITH
Are microservices just an implementation detail?
#GOTOnight Cologne | June 22nd, 2015 | Dennis Traub | @DTraub

2. EVERYBODY TALKS ABOUT MICROSERVICES
2

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

5. 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

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

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

8. SIT DOWN WITH THE EXPERTS & LISTEN

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

10. 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

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

12. Customer

13. Customer
Marketing
Target Group

14. Customer
Marketing
Target Group
Website
Visitor

15. Customer
Marketing
Target Group
Website
Visitor
Shopping Cart
Buyer

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

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

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

19. - 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

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

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

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

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

24. We don’t model reality
We model useful abstractions

25. We don’t build a model
that works for everyone

26. THANK YOU!
Dennis Traub | @DTraub | #GOTOnight