Extreme Isolation Workshop

Workshop given at Scottish Ruby Conference 2014. Some refactoring tools based around the ideas of Hexagonal Rails, the Actor Model of Concurrency, Immutability and functional programming.

1. EXTREME ISOLATION WORKSHOP @chrismdp Scottish Ruby Conference 2014
2. http://github.com/chrismdp/spacemud extreme isolation - @chrismdp git clone git://github.com:chrismdp/spacemud.git
3. I HAVE NO IDEA WHAT I’M DOING I just read other people’s blog posts and put them together
4. IS TDD DEAD? @chrismdp
7. PROBLEM
8. baz bar foo quux eke baz bar foo quux eke baz bar foo quux eke baz bar foo quux eke baz bar foo quux eke foo quux baz bar foo quux eke baz bar eke bar foo quux baz eke bar foo quux
9. HEXAGONAL RAILS Ports and Adaptors
10. persistence web mailer view controller domain
11. persistence web mailer view controller domain
12. persistence web Plain Ruby representing your domain mailer
13. SPACE MUD http://github.com/chrismdp/spacemud
14. LIVE CODING
15. YOUR TURN http://github.com/chrismdp/spacemud
16. SO HOW WOULD WE TEST THIS? ! Would you use system tests? Would you use mocks? Would you test at all?
17. ACTOR MODEL OF CONCURRENCY Separating Arrangement and Work
18. baz bar foo quux eke
19. bar test quux test foo test bar foo quux mock bar mock quuz mock bar
20. bar foo POROs baz calling code handles the arrangement ! objects handle the work, don’t know about others ! objects can be called in any order POROs POROs
21. LIVE CODING
22. YOUR TURN
23. domain persistence Person
24. Person Repository Person PORO Mongo
25. FROZEN OBJECTS
26. Person Repository Person
27. PersonRepository PersonValidator Person Web Handler Mongo web page request Request Handler InvalidPerson UpdatePerson
28. LIVE CODING
29. BENEFITS
30. Database (AR) Database (BerkeleyDB) CHANGEABILITY Drop in new adaptor implementation at the edges POROs calling code handles the arrangement ! objects handle the work, don’t know about others ! objects can be called in any order POROs Web (Rails) Web (Sinatra) Web Sockets
31. EACH OBJECT IS INDEPENDENT Dealing with value objects on the edges
32. UpdatePerson Web Handler web page InvalidPerson
33. PersonRepository UpdatePerson MySQL InvalidPerson
34. IMMUTABLE
    VALUE OBJECTS Freeze is your friend
35. DISADVANTAGES
36. TEST DRIVEN DESIGN DAMAGE
37. FURTHER EXAMPLE ON GITHUB http://github.com/thinkcodelearn/discover
38. SANDI METZ’S PRACTICAL OBJECT ORIENTED DESIGN LONDON 3 day course 25-27 June // 2 day course: 2-3 July 5% off! Use code SCO TRUBY http://kickstartacademy.io
39. BLOG SERIES http://chrismdp.com
40. THANKS @chrismdp