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Deleting Code
at Nokia
Tom Coupland
@tcoupland
#0254
InfoQ.com: News & Community Site
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Watch the video with slide
synchronization on InfoQ.com!
http://www.infoq.com/presentations
/java-nokia-case-study
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
What happened when we
set out for simplicity
Tom Coupland
@tcoupland
#0254
Nokia Entertainment Bristol
The Journey
Why did we set off?
Why did we set off?
575140
Why did we set off?
Why did we set off?
Why did we set off?
The Journey
Increased transparency
Easier to reason about
Can dive into the code
Less magic
The Journey
Simple configuration
Faster boot time
Does less
Deleting Code at Nokia
The Journey
Reduction in verbosity
Scriptable
Easier to reason
The Journey
Reduction in verbosity
Valid Java is valid Groovy
Functional concepts
Immature at the time
Lack of adoption drive
Cost/Benefit didn't add up
The Journey
Reduction in mapping code
Schema duplication
Familiar query structure
Built in sharding support
Similar write semantics
Stalked project
Engaged large group
Presented to department
Devops style deployment
The Journey
Both OO and FP paradigms
Developer satisfaction
Retains static types
Information Density
Both OO and FP paradigms
Complexity
Covert adoption
The Journey
Dynamic
Simple
Immutable
Functional
Declarative
Sense of fun
The Joy of Clojure
Embodied in Land of Lisp
Concise
Local user-group
Greenfield service
Early knowledge sharing
Brown bag meetings
The Journey
71%
~100ms
~10ms
40 12
16745751
What about Deleting Code?
How to escape
Think about what you want
Educate yourself
& those around you
Local user groups
Patience
How to move on
Perform experiments
Break down your system
Patience
Be inclusive
Be brave
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
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

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Deleting Code at Nokia