THEIMPROBABLESTORYOF:

FPANDENTREPRENEURSHIP

WHOAREWE?

XAVIERTORDOIR

ANDYPETRELLA

Findyourways

Picksomeanddig

Mémoire:polishingphase

STUDYING=:=FUTURE[OPTION[JOB]]

Grabthebasis

JOB=:=(WORK=>OPTION[EXPERIENCE])=>OPTION[MONEY]

Workingwillprobablyraiseyourexperience

Basedonthisexperience,youmightgetsomemoney

Experiencemightnotbeenough

Itwilldependonthekindofexperience

IT'SNOTTHATEASYProposal:

Job=:=((Work,Explore,Learn)=>Option[Expertize])=>Option[(Money,()=>Future[Option[Job]])]

Stillsomework*sight* Butneverstoplearning,norexploring

Expertizeislikeexperience,yetrarer

Money,theunfortunateobligation

Createyoursecretsauce,alazycalltoJob

WORKINGINIT

Everythingisdistributed

Cluesforanswersareindata

Answerquestions

MOREANDMOREDATA

Industrialdata

energygridproductionlinesfinancetransport...

MOREANDMOREDATA

Peopledata

web1.0:fewcontrolcontentweb2.0:lotsofend-usersmanualfeedwebx.y:lotsofcaptorsperuser

MOREANDMOREDATA

Whydowecollectdata?

Wealwaysmisssomeatsomepointsomethingofvalueisencodedcollaborativeconsiousness

MOBILE?REALLY?

Providingcontent=aggregatedistributedsources

BUTinsmallquantity(networkisthebottleneck)

Yesdataisavailablefromanywhere

ITISACOMMODITY

...evendevelopment

Everythingdoneisdistributed

Software(SaaS):usermanagement,social

loginproductsupportonlinebilling/paymentaccesstodatasources

Infrastructure(IaaS):storage,servers...

ATECHSTARTUP

Managingdistributedresourcesiskey!

GathersdistributeddatasourcesCallsdistributedservicescollectsrawdatadoessomeaggregationMustbeabletoscaleresourcesandcosts

FP?

Failuremanagement

Asynchronouscalls

FPdescribetheresultyouwant,nothowyougetit

Threads,cores,servers,datacenters

IfFPgetsaglobaladoptionitwillbebecauseitsolvesissuesrelatedtothedistributedenvironment.

Complexityofdistribution

FPINTHEINDUSTRY?ExamplesofpopularlanguageswithOOand

FPjavascriptrubyJava8scala

AWAIT[_]

EVAL[EXPRESSION]SCALA

valgetQueryParameter[T]=(request:Request)=>(name:String)=>request.query.parameters.get(name).as[T]

abstractclassRequest[T](valbody:Body[T])extendsQuerywithHeader{defparser:BodyParser[T]

valcontent:Option[T]=parser(body)

defsend(to:Service)=???}

caseclassHttpRequest[T](method:Method,body:Body)(implicitparser:BodyParser[T])extendsRequest(body){//...}

PLAY!FRAMEWORK2

AsyncHTTP

Eventdriven/ConcurrencyusingActor

Non-blockingIO(reactive:Iteratee/CPS)

Stateless

objectDummyextendsController{//returnasync'lythe#ofusersw/namestart'gw/q"char"defcountAs=Action.async{request=>valchar=request.queryString("char")valall:Future[Seq[User]]=users.all//orWS.urlOk(all.map(_.count(_.namestartsWith"a")))}

}

AKKA

Messagepassingstyle

Messagesareimmutable

Actorsaremutable(stateful) Threadsafetyby

confinement

Locationtransparency

classUserRepoextendsActor{varusers=Set.empty

defreceive={caseAdd(user:User)=>users=users+usercaseAll=>sender!userscaseGet(id:String)=>user=users.find(_.id==id)sender!user}}

objectAkkaAppextendsApp{//...

valrepo=system.actorOf(Props[UserRepo])

//addrepo!Add(User(1L,"")

//getvaluser=repo?Get(1L)}

SPARK

TendstoresolveBigDatasolutionflawsProvidesanabstractionondistributeddata

Usinganextendedfunctionalstyle(notonlyMR)Representsadistributedcomputationasa

GraphIn-Memory!

valsc=newSparkContext(/*...*/)lines=sc.textFile("hdfs://...")errors=lines.filter(_.startsWith("ERROR"))errors.filter(_.contains("HDFS")).map(_.split('\t')(3)).collect()