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Towards Functional Programming through Hexagonal Architecture

The document discusses introducing functional programming through hexagonal architecture, emphasizing the importance of modularity and clean design principles in software development. It covers domain models, implementation details, error handling, and various techniques for decoupling components in applications. The goal is to enhance testing ease and adaptability in the development process by implementing standardized practices and richer domain models.

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Towards Functional Programming 🦄 through Hexagonal Architecture 🎯 Habla Computing + CodelyTV
Acercándonos a la Programación Funcional 🦄 a través de la Arquitectura Hexagonal 🎯 Habla Computing + CodelyTV
Text #SCBCN18 Software Crafters Barcelona - VI Edition
Functional Programming intro based on Hexagonal Architecture Who we are @JavierCane@juanshac
Session goal 🤔
 Rethinking time Functional Programming intro based on Hexagonal Architecture Reviewing different technics to solve the same problems with more modularity
👤 Domain models Contents 🗺Design principles &Implementation details 🦄 Functional Architectures 🎯 Hexagonal Architecture 🏗 Layers implementation Functional Programming intro based on Hexagonal Architecture ⚡ Error Handling
👤 Domain models Contents 🗺Design principles &Implementation details 🦄 Functional Architectures 🎯 Hexagonal Architecture 🏗 Layers implementation Functional Programming intro based on Hexagonal Architecture ⚡ Error Handling
🗺 Design principles > 🎯 Hexagonal Architecture 🛀 Clean Architectures
🤯 Ports & adapters 🚫 🗺 Design principles > 🎯 Hexagonal Architecture
Layers & dependency rule Infrastructure Application Domain 🗺 Design principles > 🎯 Hexagonal Architecture
Layered Architecture Presentation Domain Database 🗺 Design principles > 🎯 Hexagonal Architecture
Layered vs Hexagonal Presentation Domain Database Infrastructure Application Domain 🗺 Design principles > 🎯 Hexagonal Architecture
CONTROLLER REPOS MODELS SERVICES APPLICATION SERVICE D A I Request flow IMPLEMENTATION Acceptance test Unit test Integration test 🗺 Design principles > 🎯 Hexagonal Architecture
Acceptance test Unit test Integration test CONTROLLER REPOS MODELS SERVICES APPLICATION SERVICE D A I Request flow IMPLEMENTATION 🗺 Design principles > 🎯 Hexagonal Architecture Port Adapter
VideoPostController VideoRepository VideoVideoCreator D A I DoobieMySqlVideoRepo Acceptance test Unit test Integration test Request flow example 🗺 Design principles > 🎯 Hexagonal Architecture
VideoPostController VideoRepository VideoVideoCreator D A I DoobieMySqlVideoRepo Acceptance test Unit test Integration test Port Adapter 🗺 Design principles > 🎯 Hexagonal Architecture Request flow example
Domain Events, CQRS, and Event Sourcing as an optional further step
👤 Domain models Contents 🗺Design principles &Implementation details 🦄 Functional Architectures 🎯 Hexagonal Architecture 🏗 Layers implementation Functional Programming intro based on Hexagonal Architecture ⚡ Error Handling
👤 Domain models Contents 🗺Design principles &Implementation details 🦄 Functional Architectures 🎯 Hexagonal Architecture 🏗 Layers implementation Functional Programming intro based on Hexagonal Architecture ⚡ Error Handling
What is a functional architecture? DSL1 DSL2 DSLN … 🗺 Design principles > 🦄 Functional Architectures A FUNCTIONAL LANGUAGE IS A DOMAIN- SPECIFIC LANGUAGE FOR DEFINING DOMAIN-SPECIFIC LANGUAGES
The DSLs of your application • Infrastructure DSLs • HTTP • Databases • Messaging • Application-specific DSLs • Use cases • Repos • … HTTP SERVICE DSL SQL REPO DSL 🗺 Design principles > 🦄 Functional Architectures
Are hexagonal and functional architectures like apples and oranges? HTTP SERVICE DSL SQL REPO DSL CONTROLLER SERVICE IMPL. ORM DB ADAPTER/INTERP. PORT/DSL 🗺 Design principles > 🦄 Functional Architectures
There are no exceptions • Everything is either a port or an adapter • Every adapter implements a given port • Adapters are implemented on top of other ports VideoPostController VideoRepositoryVideoRepoC DoobieMySqlVideoRepo VideoCreator HTTP 🗺 Design principles > 🦄 Functional Architectures
🎯 🦄 VideoPostController VideoRepository VideoCreator DoobieMySqlVideoRepo VideoPostController VideoRepositoryVideoRepoC DoobieMySqlVideoRepo VideoCreator HTTP
🤔 Rethinking time 🗺 Design principles
🗺 Design principles > 🤔 Rethinking time Final goals • Decouple from infrastructure • Testing easiness (test doubles when testing out use cases) • Change tolerance • ¡Same goals!
🗺 Design principles > 🤔 Rethinking time Differences: More decoupling and indirection levels • Controllers: • Consistency (APIs for all DSLs) vs. Specific needs • Conclusion: We need industry standards. PHP-FIG as example to follow • Application Services: • Consistency (APIs for all DSLs) vs. Specific needs • Reuse use case APIs in clients (e.g. user clients)
👤 Domain models Contents 🗺Design principles &Implementation details 🦄 Functional Architectures 🎯 Hexagonal Architecture 🏗 Layers implementation Functional Programming intro based on Hexagonal Architecture ⚡ Error Handling
👤 Domain models Contents 🗺Design principles &Implementation details 🦄 Functional Architectures 🎯 Hexagonal Architecture 🏗 Layers implementation Functional Programming intro based on Hexagonal Architecture ⚡ Error Handling
🎯 OOP 👤 Domain models
final case class Video( id: VideoId, title: VideoTitle, quality: VideoQuality ) 👤 Domain models > 🎯 OOP > Video Entity
object Video { def apply(id: String, title: String, quality: Int): Video = Video( VideoId(id), VideoTitle(title), VideoQuality(quality) ) } final case class Video( id: VideoId, title: VideoTitle, quality: VideoQuality ) 👤 Domain models > 🎯 OOP > Video Entity
object Video { def apply(id: String, title: String, quality: Int): Video = Video( VideoId(id), VideoTitle(title), VideoQuality(quality) ) } final case class Video( id: VideoId, title: VideoTitle, quality: VideoQuality ) 👤 Domain models > 🎯 OOP > Video Entity
object VideoQuality { val maxQuality = 50 val minQuality = 0 } final case class VideoQuality(value: Int) { require(value <= maxQuality, s"Video quality value greater than $maxQuality") require(value >= minQuality, s"Video quality value less than $minQuality") def increase(): VideoQuality = { if (value >= maxQuality) this else copy(value + 1) } } OOP: Data+Behaviour 👤 Domain models > 🎯 OOP > VideoQuality Value Object
object VideoQuality { val maxQuality = 50 val minQuality = 0 } final case class VideoQuality(value: Int) { require(value <= maxQuality, s"Video quality value greater than $maxQuality") require(value >= minQuality, s"Video quality value less than $minQuality") def increase(): VideoQuality = { if (value >= maxQuality) this else copy(value + 1) } } Behaviour Simpler API + domain semantics + immutability 👤 Domain models > 🎯 OOP > VideoQuality Value Object
case class Video( id: VideoId, title: VideoTitle, quality: VideoQuality ) { def increaseQuality(): Video = copy(quality = quality.increase()) } VideoQualityIncreaser Video increaseQuality() Behaviour Rich domain model - Tell don’t ask 👤 Domain models > 🎯 OOP > Video Entity
public final class Video { private VideoId id; private VideoQuality quality; // … public VideoQuality getQuality() { return quality; } public void setQuality( VideoQuality quality ) { this.quality = quality; } } VideoQualityIncreaser Video getQuality() increaseQuality() setQuality() Behaviour 👤 Domain models > 🎯 OOP > Video Entity
setQuality() getQuality() increaseQuality() …Increaser Video Behaviour …Increaser Video Behaviour 👤 Domain models > 🎯 OOP > Video Entity increaseQuality()
🦄 Functional Programming 👤 Domain models
…Increaser Video Behaviour 👤 Domain models > 🦄 FP > Video Entity increaseQuality() …Increaser increaseQuality() Behaviour Video …
def increaser[V: VideoBehaviour]( video: V): V = video.increaseQuality() Increaser increaseQuality() LOGIC VideoBehaviour Rich domain layer - Tell don’t ask Do not expose quality property 👤 Domain models > 🦄 FP > Video EntityTYPE CLASSES: API trait VideoBehaviour[T]{ val maxQuality: Int val minQuality: Int def increaseQuality(thing: T): T } +Less coupling!
PlainVideo 👤 Domain models > 🦄 FP > Video Entitycase class PlainVideo( id: VideoId, title: VideoTitle, quality: VideoQuality ) copy(quality=…) quality increase :VideoImpl VideoBeh INSTANTIATION implicit object VideoImpl extends VideoBehaviour[PlainVideo]{ val maxQuality = 100 val minQuality = 10 def increaseQuality(video: PlainVideo) = video.copy(quality = video.quality.increase) }
Video Behaviour 👤 Domain models > 🦄 FP > Video Entitycase class Video( id: VideoId, title: VideoTitle, quality: VideoQuality){ def increaseQuality(): Video = copy(quality = quality.increase()) } increaseQuality() :VideoImpl implicit object VideoImpl extends VideoBehaviour[Video]{ val maxQuality = Video.maxQuality def increaseQuality(video: Video) = video.increaseQuality } VideoBeh INSTANTIATION
👤 Domain models > 🦄 FP > Video Entity COMPOSITION def plainVideoIncreaser(video: PlainVideo): PlainVideo = increaser[PlainVideo](video) def videoIncreaser(video: Video): Video = increaser[Video](video)
🤔 Rethinking time 👤 Domain models
& Implementation > 👤 Domain models > 🤔 Rethinking time Differences on Domain Modelling goals • 🦄 FP Type classes: APIs with steroids • Goal: Coupling to behaviours (not to state) • Decouple behaviour and data • Support rich domain layers • 🎯 OOP: High cohesion (behaviour close to related data) • Modularity because abstractions => More indirection levels (complexity) • Goal: Rich domain models (data+behaviour) INSTANTIATION TYPECLASS: API COMPOSITION LOGIC
👤 Domain models Contents 🗺Design principles &Implementation details 🦄 Functional Architectures 🎯 Hexagonal Architecture 🏗 Layers implementation Functional Programming intro based on Hexagonal Architecture ⚡ Error Handling
👤 Domain models Contents 🗺Design principles &Implementation details 🦄 Functional Architectures 🎯 Hexagonal Architecture 🏗 Layers implementation Functional Programming intro based on Hexagonal Architecture ⚡ Error Handling
🎯 Hexagonal Architecture 🏗 Layers implementations
final class VideoPostController(creator: VideoCreator) { def post(id: String, title: String): StandardRoute = { creator.create(VideoId(id), VideoTitle(title)) complete(HttpResponse(Created)) } } VideoPostController - HTTP API Controller VideoPostController
final class VideoPostController(creator: VideoCreator) { def post(id: String, title: String): StandardRoute = { creator.create(VideoId(id), VideoTitle(title)) complete(HttpResponse(Created)) } } VideoPostController - HTTP API Controller VideoPostController
final class VideoCreator( repository: VideoRepository, publisher: MessagePublisher ) { def create(id: VideoId, title: VideoTitle): Unit = { val video = Video(id, title) repository.save(video) publisher.publish(VideoCreated(video)) } } VideoCreator - Application Service/Use case VideoPostController VideoCreator
final class VideoCreator( repository: VideoRepository, publisher: MessagePublisher ) { def create(id: VideoId, title: VideoTitle): Unit = { val video = Video(id, title) repository.save(video) publisher.publish(VideoCreated(video)) } } VideoCreator - Application Service/Use case VideoPostController VideoCreator
trait VideoRepository { def all(): Future[Seq[Video]] def save(video: Video): Future[Unit] } VideoRepository - Domain contract/Port VideoPostController VideoRepositoryVideoCreator
DoobieMySqlVideoRepository - Infrastructure implementation/Adapter VideoPostController VideoRepositoryVideoCreator DoobieMySqlVideoRepo final class DoobieMySqlVideoRepository(db: DoobieDbConnection) (implicit ec: ExecutionContext) extends VideoRepository { override def all(): Future[Seq[Video]] = db.read(sql”SELECT…”.query[Video].to[Seq]) override def save(video: Video): Future[Unit] = sql"INSERT INTO…”.update.run .transact(db.transactor) .unsafeToFuture().map(_ => ()) }
🦄 Functional Architectures 🏗 Layers implementations
trait VideoRepository { def all(): Future[Seq[Video]] def save(video: Video): Future[Unit] } Domain contract/PortVideoRepository ? trait VideoRepository { def all(): cats.IO[Seq[Video]] def save(video: Video): cats.IO[Unit] } trait VideoRepository { def all(): Seq[Video] def save(video: Video): Unit }
trait VideoRepository { def all(): Seq[Video] def save(video: Video): Unit } trait VideoRepository { def all(): Future[Seq[Video]] def save(video: Video): Future[Unit] } trait VideoRepository { def all(): cats.IO[Seq[Video]] def save(video: Video): cats.IO[Unit] } Domain contract/Port infrastructure leaks VideoRepository ?
trait VideoRepository[P[_]] { def all(): P[Seq[Video]] def save(video: Video): P[Unit] } TYPE (CONSTRUCTOR) CLASSES VideoRepository ? Domain contract/Port
Infrastructure implementation/Adapter import scala.concurent.Future final class DoobieMySqlVideoRepoFuture( db: DoobieDbConnection[Future])(implicit ec: ExecutionContext) extends VideoRepository[Future] { override def all(): Future[Seq[Video]] = db.read(sql"SELECT ...".query[Video].to[Seq]) override def save(video: Video): Future[Unit] = sql"INSERT INTO ... ".update.run .transact(db.transactor) .map(_ => ()) } VideoRepository DoobieVideoRepoFuture INSTANTIATION
Infrastructure implementation/Adapter import scala.concurent.Future final class DoobieMySqlVideoRepoFuture( db: DoobieDbConnection[Future])(implicit ec: ExecutionContext) extends VideoRepository[Future] { override def all(): Future[Seq[Video]] = db.read(sql"SELECT ...".query[Video].to[Seq]) override def save(video: Video): Future[Unit] = sql"INSERT INTO ... ".update.run .transact(db.transactor) .map(_ => ()) } VideoRepository DoobieVideoRepoFuture INSTANTIATION
Infrastructure implementation/AdapterVideoRepository DoobieVideoRepoIO import cats.effect.IO final class DoobieMySqlVideoRepoIO( db: DoobieDbConnection[IO]) extends VideoRepository[IO] { override def all(): IO[Seq[Video]] = db.read(sql"SELECT ...".query[Video].to[Seq]) override def save(video: Video): IO[Unit] = sql"INSERT INTO ... ".update.run .transact(db.transactor) .map(_ => ()) } INSTANTIATION
Infrastructure implementation/AdapterVideoRepository DoobieVideoRepoIO import cats.effect.IO final class DoobieMySqlVideoRepoIO( db: DoobieDbConnection[IO]) extends VideoRepository[IO] { override def all(): IO[Seq[Video]] = db.read(sql"SELECT ...".query[Video].to[Seq]) override def save(video: Video): IO[Unit] = sql"INSERT INTO ... ".update.run .transact(db.transactor) .map(_ => ()) } INSTANTIATION
Infrastructure implementation/AdapterVideoRepository DoobieVideoRepo (GENERIC) INSTANTIATION final case class DoobieMySqlVideoRepo[P[_]: Monad]()( db: DoobieDbConnection[P]) extends VideoRepository[P] { override def all(): P[Seq[Video]] = db.read(sql"SELECT …”.query[Video].to[Seq]) override def save(video: Video): P[Unit] = sql"INSERT …”.update.run .transact(db.transactor) .map(_ => ()) }
Infrastructure implementation/AdapterVideoRepository DoobieVideoRepo (GENERIC) INSTANTIATION final case class DoobieMySqlVideoRepo[P[_]: Monad]()( db: DoobieDbConnection[P]) extends VideoRepository[P] { override def all(): P[Seq[Video]] = db.read(sql"SELECT …”.query[Video].to[Seq]) override def save(video: Video): P[Unit] = sql"INSERT …”.update.run .transact(db.transactor) .map(_ => ()) }
🤔 Rethinking time 🏗 Layers implementations
Differences on layers implementation • Same goal: Decouple from infrastructure • 🦄 FP: • One step forward to avoid infrastructure leaks • Again, through type classes: a better API • More complexity: monads, applicatives, etc. & Implementation > 🏗 Layers > 🤔 Rethinking time
👤 Domain models Contents 🗺Design principles &Implementation details 🦄 Functional Architectures 🎯 Hexagonal Architecture 🏗 Layers implementation Functional Programming intro based on Hexagonal Architecture ⚡ Error Handling
👤 Domain models Contents 🗺Design principles &Implementation details 🦄 Functional Architectures 🎯 Hexagonal Architecture 🏗 Layers implementation Functional Programming intro based on Hexagonal Architecture ⚡ Error Handling
🎯 OOP ⚡Error Handling
object VideoQuality { val maxQuality = 50 val minQuality = 0 } final case class VideoQuality(value: Int) { require(value <= maxQuality, s"Video quality value greater than $maxQuality") require(value >= minQuality, s"Video quality value less than $minQuality") def increase(): VideoQuality = { if (value >= maxQuality) this else copy(value + 1) } } VO: Raise exceptions for invalid states ⚡Error Handling > 🎯 OOP > Raise exceptions
final class VideoFinder(repository: VideoRepository) (implicit ec: ExecutionContext) { def find(id: VideoId): Future[Video] = repository.search(id).map { videoOption => if (videoOption.isEmpty) throw VideoNotFound(id) else videoOption.get } } Imperativeness ⚡Error Handling > 🎯 OOP > Raise exceptions trait VideoRepository { def search(id: VideoId): Future[Option[Video]] }
final class VideoGetController extends ApiController { protected function exceptions(): array { return [ VideoNotFound::class => Response::HTTP_NOT_FOUND, ]; } // … } HTTP Mapping ⚡Error Handling > 🎯 OOP > Handle exceptions
🦄 Functional Architectures ⚡Error Handling
Imperativeness ⚡Error Handling > 🦄 FP > Raise errors Declarativeness + final case class VideoFinderRepo[P[_]]()( implicit repository: VideoRepository[P] ) extends VideoFinder[P] { def find(id: VideoId)(implicit E: MonadError[P, VideoFinderError]): P[Video] = repository.search(id) flatMap { maybeVideo => maybeVideo.fold(E.raiseError[Video](VideoNotFound(id))){ video => video.pure[P] } } }
⚡Error Handling > 🦄 FP > Raise errors final case class VideoFinderRepo[P[_]]()( implicit repository: VideoRepository[P] ) extends VideoFinder[P] { def find(id: VideoId)(implicit E: MonadError[P, VideoFinderError]): P[Video] = repository.search(id) flatMap { maybeVideo => maybeVideo.fold(E.raiseError[Video](VideoNotFound(id))){ video => video.pure[P] } } } A functional signature doesn’t hide anything!
⚡Error Handling > 🦄 FP > Raise errors TYPE CLASSES trait MonadError[F[_], E] { def raiseError[A](e: E): F[A] def handleErrorWith[A](fa: F[A])(f: E => F[A]): F[A] }
⚡Error Handling > 🦄 FP > Raise errors final case class VideoFinderRepo[P[_]: Monad]()( implicit repository: VideoRepository[P] ) extends VideoFinder[P] { def find(id: VideoId)(implicit E: MonadError[P, VideoFinderError]): P[Video] = repository.search(id) flatMap { maybeVideo => maybeVideo.fold(E.raiseError[Video](VideoNotFound(id))){ video => video.pure[P] } } }
⚡Error Handling > 🦄 FP > Raise errors final case class VideoFinderRepo[P[_]: Monad]()( implicit repository: VideoRepository[P] ) extends VideoFinder[P] { def find(id: VideoId)(implicit E: MonadError[P, VideoFinderError]): P[Video] = repository.search(id) flatMap { maybeVideo => maybeVideo.fold(E.raiseError[Video](VideoNotFound(id))){ video => video.pure[P] } } } Imperativeness
⚡Error Handling > 🦄 FP > Raise errors final case class VideoFinderRepo[P[_]: Monad]()( implicit repository: VideoRepository[P] ) extends VideoFinder[P] { def find(id: VideoId)(implicit E: MonadError[P, VideoFinderError]): P[Video] = val maybeVideo = repository.search(id) ; if (videoOption.isEmpty) throw VideoNotFound(id) else videoOption.get } Monadic programming is imperative programming with steroids!
object FutureBasedController{ case class VideoController( videoFinder: VideoFinder[Future] )(implicit ec: ExecutionContext) extends Http4sDsl[Future] { val service = HttpService[Future] { case GET -> Root / "videos" / id => videoFinder.find(VideoId(id)) flatMap { case video => Ok(video.asJson) } recoverWith { case error: VideoNotFound => NotFound(error.asJson) } } } } ⚡Error Handling > 🦄 FP > Raise errors Future-based HTTP Mapping LOGIC
case class VideoController[P[_]: Effect]( videoFinder: VideoFinder[P] ) extends Http4sDsl[P] { val service = HttpService[P] { case GET -> Root / "videos" / id => videoFinder.find(VideoId(id)) flatMap { case video => Ok(video.asJson) } handleErrorWith { case error: VideoNotFound => NotFound(error.asJson) } } } ⚡Error Handling > 🦄 FP > Raise errors Generic HTTP Mapping MonadError API LOGIC
🤔 Rethinking time ⚡Error Handling
Differences on Error handling • 🦄 FP: • FP tell no lies (or, rather, doesn’t hide anything): more robust contracts using type system • Declarative: more abstract about how the error will be raised (exceptions, Option, Either, etc) & Implementation > ⚡Error Handling > 🤔 Rethinking time
🍕Takeaways
🎯 🦄 VideoPostController VideoRepository VideoCreator DoobieMySqlVideoRepo VideoPostController VideoRepositoryVideoRepoC DoobieMySqlVideoRepo VideoCreator HTTP
🍕Takeaways ⚡ Exceptions 🏗 Monolithic interfaces 👤 Rich domain models
🍕Takeaways ⚡ Exceptions 🏗 Monolithic interfaces 👤 Rich domain models 🦄 TypeClasses ⚛ APIs with steroids 🧐 FP as a subsuming paradigm
ℹ More info
References ℹ More info
👉Formación FP presencial 👈 hablapps.com
👉Cursos en vídeo online 👈 codely.tv/pro/cursos

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