Functional Architecture - goto copenhagen 2012
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Functional Architecture - goto copenhagen 2012

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Functional Architecture presentation on the Software Architecture track at goto conference in Copenhagen 2012.

Functional Architecture presentation on the Software Architecture track at goto conference in Copenhagen 2012.

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  • I work as a hands-on Software Architect AND Developer at Trayport.I work with the project team on the code on a day-to-day basis.
  • Wrote first commercial game when I was 13, nearly 30 years ago which makes me just over 27 ;)Characterized by functional concepts.Video games: state machines & DSLs, transformation, math, proceduralE-Commerce: immutable messages & commands (audit trail – no deletion)Machine Learning: computationTrading: immutable messages, computation, concurrency
  • C is assemblerC++ was initially called C with ClassesJava/C# = C with Classes + GC
  • 1980s/1990s Games written in C interpreters & custom DSLs with coroutines, engines written in Assembler including C2000s/2010s Games written in Lua & custom DSLs, engines written in C & C++
  • See: http://en.wikipedia.org/wiki/Coroutine#Common_usesCode sample:http://fssnip.net/ca
  • See: http://en.wikipedia.org/wiki/Coroutine#Common_usesCode sample:http://fssnip.net/ca
  • Runtime: 80/20 rule – performance of most code is not importantDevelopment: time to market is importantPsygnosis offered to pay: 25,000GBP to convert a video game in 6 months 75,000GBP to convert a video game in 3 months
  • Lightweight types with correct defaultsImmutabilityCompositionSeparation of concernsLightweight functions with correct defaultsIdempotentTestableType signatures
  • Map: (‘T -> ‘U) -> ‘T -> ‘U
  • Samples:Units in CellzLunar Landurz
  • Putting it all together: http://www.trayport.com/en/joule/video
  • Intellisense via the dot gives discoverabilityMakes it easy to explore an APIWorld bank sample

Functional Architecture - goto copenhagen 2012 Functional Architecture - goto copenhagen 2012 Presentation Transcript

  • FUNCTIONAL ARCHITECTURE Phillip Trelford Trayport
  • About MeFamily Values Retail Halo 3 Trade
  • Programming LanguagesAssemblers C with Classes Functional• 6502 • C++ • JavaScript• Z80 • Java • F#• 680x0 • C# • Lua• 80x86• 65c816• SH-2• R3000•C
  • Video Game Decades1980s/1990s 2000s/2010s Scripts Scripts C with Assemblers Classes
  • Coroutine ZombiesPseudo Coderandom_pause 10while not dead wait_until_in_range 50.0 home_in_on_target 10
  • Coroutine ZombiesPseudo Code F#random_pause 10 yield! random_pause 10while not dead while true do wait_until_in_range 50.0 yield! wait_range 50 home_in_on_target 10 yield! home_in 10
  • SpeedRuntime DevelopmentSuper Nintendo DSL• Interprets byte code • Close to domain• On 3.58MHz CPU • Easy to port• At 60FPS • Zero compile time
  • FP Sweet Spots DomainComputation Concurrency
  • Thoughtworks Tech Radar 2012F# Languages“F# is excellent at concisely expressing business and domain logic.”
  • TypesF# UML Class Diagramtype Object(name) = member this.Name = nametype Action = | Call of Object * string *Object | Async of Object * string *Object
  • FunctionsImply : Instrument[] -> Order[] -> Order[]
  • Computation
  • Concurrencyasync { do! control.MouseLeftButtonDown |> Async.AwaitEvent}
  • Joule Trading screen
  • Thoughtworks Tech Radar 2012“Developers trying to achieve explicit business logic within an application may opt to express their domain in F# with the majority of plumbing code in C#.”
  • ApplicationsErlang for Fault Tolerant Messaging• Messaging in Chat, Gaming, Messaging, NoSQL• Facebook, MMOG, RabbitMQ, Amazon, …F#/Scala• Computation in Insurance, Finance, Gaming• Credit Suisse, Jane Street, TrueSkill, Path of Go, …C#/Java/PHP/Python/Ruby…• CRUD in Line of Business Applications• Everything else
  • Classesreference.Member(argument, …)Member(reference, argument, …)
  • Dot Driven Development
  • ButtonsMethods 63Properties 63Events 35Constructors 1Total Members 162
  • XBLA: Path to Go – F# AI
  • Q&A• Twitter: @ptrelford• Email: phil at trelford.com• Blog: http://trelford.com/blog