Controlled Chaos: A Case Study Of Introducing Rails Into An Operational NASA System - RailsConf 2011

Controlled Chaos A case study of introducing Rails into an operational NASA system Dan Pilone / Jason Gilman RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

ECHO Key Metrics Support 13 Data Centers 3200 Earth Science Datasets ~100M pieces of science information ~100% uptime* RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason Gilman *excluding planned maintenanceWednesday, June 1, 2011

Why are we talking about this... RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

http://pastorweasel.blogspot.com/ RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Why did we do it? RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Problem had changed RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

WIST ECHO ECHO DB RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Technology had changed RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

WIST Perl ECHO <!DOCTYPE xml PUBLIC “-//W3C//DT <html> bgcolor="red"> <body <?xml <html> bgcolor="red"> <body <h1> <h1> <body shouldnt be static. This bgcolor="red"> This shouldnt be static. </h1> <h1> </h1> This shouldnt be static. </body> </body> </h1> ECHO </html> </html> </body> DB </html> RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

?????? ECHO ECHO DB ? RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

WIST ECHO ECHO DB REST API... RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

But there was hope... RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Agile Process RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Very Talented Team RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Fantastic Customer and Management support RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

What did we want? RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Happy customer RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Top Notch Client RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Happy Developers RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Quality Development Experience RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

We had about 10 months... RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

...and 4 developers... RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

We went shopping. RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason Gilman http://www.cheapbeast.com/proﬁle-vickyWednesday, June 1, 2011

Prototyping is hard. RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Developers are harder. RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Why Rails? Lots of community “sell” JRuby gave us a transition path* RailsConf RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

What Rails offered us Developer interest and excitement Clearly the right tool for the job Hoped for a signiﬁcantly reduced code base Hoped for rapid development and releases RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

What did this impact? RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Everything. RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Java Developers RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

List<String> names = new ArrayList<String>(); Java Developers RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

List<String> names = new ArrayList<String>(); Java Developers expe rts! RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

List<String> names = new ArrayList<String>(); Java Developers expe rts! Monthly Iteration RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

List<String> names = new ArrayList<String>(); Java Developers Dedicated Test Team expe rts! Monthly Iteration RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

First Attempts RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Adopting a new language RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

ACTFL Stages 1. Novice 2. Intermediate 3. Advanced 4. Superior http://www.languagetesting.com/scale.htm http://www.sil.org/lingualinks/languagelearning/otherresources/ gudlnsfralnggandcltrlrnngprgrm/IntroductionToGuidelinesForALa.htm RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Novice Can not hold a conversation "memorized survival phrases" "Where is the bathroom?" "What time is it? "Check, please." RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Novice Equivalent $ rails generate scaffold Post name:string title:string content:text RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Intermediate Conversations with pauses, inaccuracies, and self corrections Struggle to answer questions "vocabulary and syntax are strongly inﬂuenced by their ﬁrst language" "I + want + beer + for + me + drink" RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Intermediate Equivalent class Person def getName() @name end def setName(newName) @name = newName end def self.getNames(peopleList) nameList = Array.new() for(person in peopleList) nameList.push(person.getName()) end return nameList end end RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Advanced "connected narrative discourse" "comprehend language related to a vast range of topics, situations and contexts" "easily process many social nuances" RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Advanced Equivalent class Person include XmlSerializer attr_accessor :name def self.names(people) people.map &:name end end RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Superior "increasing facility in abstract and hypothetical discussions" "provide lengthy and coherent narrations, all with ease, ﬂuency, and accuracy" Ability to speak at length on abstract topics without hesitation. RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Superior Equivalent module ActiveRecord class Base def method_missing(method_id, *arguments, &block) # generates find_by_field type methods ... end end end RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

100% 75% 50% 25% 0% Novice Intermediate Advanced Superior RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Everyone starts here 100% 75% 50% 25% 0% Novice Intermediate Advanced Superior RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Everyone starts here 100% 2 weeks to 2 months 75% 50% 25% 0% Novice Intermediate Advanced Superior RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Everyone starts here 100% 2 weeks to 2 months 75% 3 - 6 months 50% 25% 0% Novice Intermediate Advanced Superior RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

8 months to a year Everyone starts here 100% 2 weeks to 2 months 75% 3 - 6 months 50% 25% 0% Novice Intermediate Advanced Superior RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

We got a little better... RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

git RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

celerity git jasmine mocha FactoryGirl formtastic soap4r rspec echoe jammit sass cucumber capybara nokogiri rufus minitest webrat 2011 - Controlled Chaos - Dan Pilone - Jason Gilman xmlsimple RailsConf TestUnitWednesday, June 1, 2011

Deadlines were getting closer Developer unrest Working long hours We werent getting things done RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

http://www.ﬂickr.com/photos/ewwhite/4462922520/ RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Java • Got things done • Dissatisﬁed by the technology • Bored Unhappy RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Rails •We werent getting things done •Technology Unfamiliarity •Frustrated Unhappy RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Developer Happiness Challenged Meaningful Work Language Workplace ? RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Developer Happiness Challenged Meaningful Work Language Productivity Workplace ? RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Am I trying to understand a business problem or am I trying to ﬁgure out why bundle install just failed? RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

http://www.ﬂickr.com/photos/ladybeames/2896787167/ RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Addressing the problems Disciplined refactoring and introduction of new gems Communication Brown bags Chat rooms Pair programming Wiki RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

http://www.ﬂickr.com/photos/camknows RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Things we worried about... Maintainability Technical longevity Learning Curve Developer buy-in RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

...but didn’t need to. Maintainability Technical longevity Learning Curve Developer buy-in RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

...but didn’t need to. Lines of code 300000 Maintainability 225000 Technical longevity 150000 Learning Curve Developer buy-in 75000 0 WIST Reverb + REST RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

...but didn’t need to. Maintainability Technical longevity Learning Curve Developer buy-in RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

What were the real problems? http://www.ﬂickr.com/photos/stuant63/2255781557 RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Real Problems Learning curve Constant refactoring Cucumber testing is hard to get right Proliferation of technologies RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Better than expected... Ruby language productivity Metaprogramming application to domain problems Wide availability and applicability of gems Community (enthusiasm, meet ups, speed of improvements in technology) RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

It’s just Ruby 1.9 Gave us a transition path and ROI on our Java All the beneﬁts of the JVM - performance, threading, GC, etc. Combined with Warbler allows us to leverage existing deployment model RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

It’s just Ruby 1.9 Gave us a transition path and ROI on our Java All the beneﬁts of the JVM - performance, threading, GC, etc. Combined with Warbler allows us to leverage existing deployment model But we actually reused less Java than we thought... RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Time on a logarithmic scale! REXML source: http://www.rubyinside.com/ruby-xml-performance-benchmarks-1641.html RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Generated WSDL Java JAXB Schemas spring-ws RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Would we do it again? RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Absolutely RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

What would we have done differently? Not a whole lot Consultants? Training? Medium sized pilot project? Address build and deployment approaches earlier? RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Key Take-aways It will impact everything Communication is essential Rails has been a good choice but.. Dependent on team and management to pull it off Developer happiness = Developer Productivity Control the change RailsConf 2011 - Controlled Chaos - Dan Pilone - Jason GilmanWednesday, June 1, 2011

Questions? Dan Pilone - @danpilone http://spkr8.com/t/7577 Jason Gilman - @jasongilmanWednesday, June 1, 2011

Controlled Chaos: A Case Study Of Introducing Rails Into An Operational NASA System - RailsConf 2011

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Controlled Chaos: A Case Study Of Introducing Rails Into An Operational NASA System - RailsConf 2011 Presentation Transcript

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