最新DDDアーキテクチャとAkkaでの実装ヒントについて

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࠷৽DDDΞʔΩςΫνϟ ͱAkkaͰͷ࣮૷ώϯτ ʹ͍ͭͯ Ճ౻५Ұ ͔ͱ͡ΎΜ $IBU8PSL

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࠷৽DDDΞʔΩςΫνϟͱAkkaͰͷ࣮૷ώϯτʹ͍ͭͯ 2016/03/26 © ChatWork All rights reserved. 46 υϝΠϯαʔϏεͱͯ͠ͷ1SPDFTT.BOBHFS w ޱ࠲ؒసૹͷυϝΠ ϯαʔϏεɻ w #BOL"DDPVOUؒͰ͓ ۚΛసૹ͢Δɻ w 1FSTJTUFODF'4.಺ ෦ঢ়ଶ͕ӬଓԽՄೳ ͳ༗ݶεςʔτϚγ ϯɻൃੜ͢ΔυϝΠϯ ΠϕϯτΛӬଓԽ͢ Δɻ class TransferDomainService(id: UUID) extends PersistentFSM[State, Data, Event] {  override def persistenceId: String = id.toString  override def domainEventClassTag: ClassTag[Event] = classTag[Event]  override def applyEvent(domainEvent: Event, currentData: Data): Data =   domainEvent match {  case Transferred(id, money, from, to, ref) => TransferData(id, money, from, to, ref)  case Transferring(id, money, from, to, ref) => TransferData(id, money, from, to, ref)  }    startWith(Stopped, Empty)  when(Stopped) {  case Event(Transfer(requestId, money, from, to), _) =>  context.system.eventStream.subscribe(self, classOf[Decreased])  val ev = Transferring(UUID.randomUUID(), money, from, to, sender())  goto(Started) applying ev andThen {  case d: TransferData =>  from ! Decrease(UUID.randomUUID(), money)  sender() ! CommandSucceeded(UUID.randomUUID(), requestId)  context.system.eventStream.publish(ev)  }  }  when(Started) {  case Event(Decreased(_, _), _) =>  goto(FromDecreased) andThen {  case d@TransferData(_, money, from, to) =>  context.system.eventStream.unsubscribe(self, classOf[Decreased])  context.system.eventStream.subscribe(self, classOf[Increased])  to ! Increase(UUID.randomUUID(), money)  }  case ev@Event(CommandSucceeded(_, _),_) =>  stay  }  when(FromDecreased) {  case Event(Increased(_, _), TransferData(_, money, from, to, ref)) =>  goto(Stopped) applying Transferred(UUID.randomUUID(), money, from, to, ref) andThen {  case d: TransferData =>  context.system.eventStream.unsubscribe(self, classOf[Increased])  context.system.eventStream.publish(Transferred(UUID.randomUUID(), money, from, to))  }  case ev@Event(CommandSucceeded(_, _),_) =>  stay  }  initialize()  }

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࠷৽DDDΞʔΩςΫνϟͱAkkaͰͷ࣮૷ώϯτʹ͍ͭͯ 2016/03/26 © ChatWork All rights reserved. 52 3FBE.PEFM6QEBUFS w BLLBQFSTJTUFODFRVFSZ Λ࢖ͬͯϦʔυϞσϧΛ ߏங͢ΔඇಉظετϦʔ ϜॲཧΛ࣮૷͢Δɻ w ॻ͖ࠐΈετϨʔδʹ ߹Θ࣮ͤͨ૷͕ඞཁʹ ͳΔͷͰɺ࣮૷͕೉͠ ͍ɻ ͨͱ͑͹ɺ.Z42- ͰϚελʔҰ୆ͩͱ෼ ࢄॻ͖ࠐΈͯ͠΋͋·Γ ҙຯ͕ͳ͍ɻଞʹ΋ί ωΫγϣϯϓʔϧͷ໰୊ ΋͋ΔɻNBQ"TZODͰଟ ॏ౓Λઃఆ͢ΔͱΑ ͍ɻ class ReadModelUpdater(implicit val system: ActorSystem) {  private val readJournal = PersistenceQuery(system).readJournalFor[LeveldbReadJournal] (LeveldbReadJournal.Identifier)   private val persistenceIdsSource = readJournal.allPersistenceIds()  private val getPersistenceWithModelNameFlow = Flow[String].map { persistenceId =>  val modelName = persistenceId.split("-").head  PersistenceWithModelName(persistenceId, modelName)  }   val getUserLatestVersionFlow = Flow[PersistenceWithModelName].map {  case PersistenceWithModelName(pid, m) if m == UserAggregate.typeName =>  PersistenceWithVersion(pid, DB.readOnly(InfraUser.getLatestVersion(_)).getOrElse(0L))  } private val getEventsFlow = Flow[PersistenceWithVersion].flatMapConcat {  case PersistenceWithVersion(pid, version) =>  readJournal.eventsByPersistenceId(pid, version + 1, Long.MaxValue)  }   val updateUserEventFlow = Flow[EventEnvelope].map {  case v@EventEnvelope(_, _, sequenceNr, UserInitialized(_, id, name, datetime)) =>  InfraUser.createWithAttributes('id -> InfraUserId(id.value.toString),'deleted -> false,'name -> name,'createAt -> datetime,'updateAt -> datetime,'version -> 1)  case v@EventEnvelope(_, _, sequenceNr, UserNameUpdated(_, id, name, datetime)) =>  val updated = InfraUser.updateByIdAndVersion(InfraUserId(id.value.toString), sequenceNr).withAttributes('name -> name,'updateAt -> datetime,'version -> sequenceNr)  if (updated == 0) throw new Exception(s"cannot be updated: $id")  case v@EventEnvelope(_, _, sequenceNr, UserDestroyed(_, id, datetime)) =>  val updated = InfraUser.updateByIdAndVersion(InfraUserId(id.value.toString), sequenceNr).withAttributes('deleted -> true,'updateAt -> datetime,'version -> sequenceNr)  if (updated == 0) throw new Exception(s"cannot be updated: $id")  }   def start(): Future[Unit] = persistenceIdsSource  .via(getPersistenceWithModelNameFlow)  .via(getUserLatestVersionFlow)  .via(getEventsFlow)  .via(updateUserEventFlow)  .toMat(Sink.last)(Keep.right)  .run()    }

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