Video and slides synchronized, mp3 and slide download available at http://bit.ly/16BGPyu. Tom Coupland discusses some of the various technologies investigated, and in many cases deployed at Nokia including Gradle, Spring, MongoDB and Clojure. Filmed at qconlondon.com. Tom Coupland is a Senior Engineer at Nokia Entertainment Bristol. After years of Java, he set out to find more productive and elegant tools, currently very much enjoying spending time with Clojure. When not trying to make his bit of the world of software a better place, he can be found out in the real one, running, preferably in the mud, wind and rain. Twitter: @tcoupland

1. Deleting Code
at Nokia
Tom Coupland
@tcoupland
#0254

2. InfoQ.com: News & Community Site
• 750,000 unique visitors/month
• Published in 4 languages (English, Chinese, Japanese and Brazilian
Portuguese)
• Post content from our QCon conferences
• News 15-20 / week
• Articles 3-4 / week
• Presentations (videos) 12-15 / week
• Interviews 2-3 / week
• Books 1 / month
Watch the video with slide
synchronization on InfoQ.com!
http://www.infoq.com/presentations
/java-nokia-case-study

3. Presented at QCon London
www.qconlondon.com
Purpose of QCon
- to empower software development by facilitating the spread of
knowledge and innovation
Strategy
- practitioner-driven conference designed for YOU: influencers of
change and innovation in your teams
- speakers and topics driving the evolution and innovation
- connecting and catalyzing the influencers and innovators
Highlights
- attended by more than 12,000 delegates since 2007
- held in 9 cities worldwide

4. What happened when we
set out for simplicity
Tom Coupland
@tcoupland
#0254

5. Nokia Entertainment Bristol

6. The Journey

7. Why did we set off?

8. Why did we set off?
575140

9. Why did we set off?

10. Why did we set off?

11. Why did we set off?

12. The Journey

13. Increased transparency
Easier to reason about
Can dive into the code
Less magic

14. The Journey

15. Simple configuration
Faster boot time
Does less

17. The Journey

18. Reduction in verbosity
Scriptable
Easier to reason

19. The Journey

20. Reduction in verbosity
Valid Java is valid Groovy
Functional concepts

21. Immature at the time
Lack of adoption drive
Cost/Benefit didn't add up

22. The Journey

23. Reduction in mapping code
Schema duplication
Familiar query structure
Built in sharding support
Similar write semantics

24. Stalked project
Engaged large group
Presented to department
Devops style deployment

25. The Journey

26. Both OO and FP paradigms
Developer satisfaction
Retains static types
Information Density

27. Both OO and FP paradigms
Complexity
Covert adoption

28. The Journey

29. Dynamic
Simple
Immutable
Functional
Declarative

30. Sense of fun
The Joy of Clojure
Embodied in Land of Lisp
Concise

31. Local user-group
Greenfield service
Early knowledge sharing
Brown bag meetings

32. The Journey

33. 71%
~100ms
~10ms
40 12
16745751
What about Deleting Code?

34. How to escape
Think about what you want
Educate yourself
& those around you
Local user groups
Patience

35. How to move on
Perform experiments
Break down your system
Patience
Be inclusive
Be brave

36. Never make this mistake again?
You're going to
Prepare for it instead
Relax
Break down your system
Keep learning
Have fun
Time of 'The Stack' is over

37. Thank You
Refs:
"Simple Made Easy"
RHickey @ QCon 2012 (and others)
"Six Months of MongoDB"
TCoupland @ MongoUK 2012
"Clojure at Nokia Entertainment"
AJones & BGriffiths @ Skillsmatter 22/01/13
#0254