Scala Tagged类代码示例

//设置package包名称以及导入依赖的类
package homeworkzen.domain.utils

import akka.persistence.journal.{Tagged, WriteEventAdapter}
import homeworkzen.domain.command.message.{UnitEvent, UserCreatedEvent, UserEvent}
import homeworkzen.util.Base64

class TaggingEventAdapter extends WriteEventAdapter {
  override def toJournal(event: Any): Any = event match {
    case unitEvent: UnitEvent => Tagged(unitEvent, Set(unitEvent.userId.id.toString, unitEvent.unitId.id.toString))
    case createdEvent: UserCreatedEvent => // add username to allow authentification query
      Tagged(createdEvent, Set(createdEvent.userId.id.toString, Base64.encodeString(createdEvent.userEntry.username)))
    case userEvent: UserEvent => Tagged(userEvent, Set(userEvent.userId.id.toString))
    case _ => event
  }

  override def manifest(event: Any): String = ""
} 

//设置package包名称以及导入依赖的类
package com.franklevering.banking.domain.model.account

import java.util.UUID

import akka.persistence.PersistentActor
import akka.persistence.journal.Tagged
import com.franklevering.common.domain.event.Event
import com.franklevering.ports.adapters.http.request.handlers.CreateCheckingsAccountResponse

abstract class AbstractAccount()

case class CheckingsAccountCreated(id: UUID, balance: BigDecimal = 0.0) extends Event
case class CreateCheckingsAccount(name: String)
case class CheckingsAccount(id: UUID, balance: BigDecimal = 0.0) extends AbstractAccount ()

case class SavingsAccountCreated(id: UUID, balance: BigDecimal = 0.0) extends Event
case class CreateSavingsAccount(id: UUID)
case class SavingsAccount(id: UUID, balance: BigDecimal = 0.0) extends AbstractAccount()

case class WithdrawMoney(id: UUID, amount: BigDecimal)
case class MoneyWithdrawn(id: UUID, amount: BigDecimal) extends Event

class Account(id: UUID) extends PersistentActor {

  var state: Option[AbstractAccount] = None
  var balance: BigDecimal = 0.0

  override def receiveRecover: Receive = {
    case checkingsAccountCreated: CheckingsAccountCreated => updateState(checkingsAccountCreated)
  }

  override def receiveCommand: Receive = {
    case createCheckingsAccount: CreateCheckingsAccount =>
      persist(Tagged(CheckingsAccountCreated(id), Set("account"))) { event =>
        val checkingsAccountCreatedEvent = event.payload.asInstanceOf[CheckingsAccountCreated]
        updateState(checkingsAccountCreatedEvent)
        sender ! CreateCheckingsAccountResponse(checkingsAccountCreatedEvent.id.toString)
      }
    case withdrawMoney: WithdrawMoney =>
      if ((balance - withdrawMoney.amount) < 0) {
        throw new Exception("Not enough funds")
      }

      persist(Tagged(MoneyWithdrawn(withdrawMoney.id, withdrawMoney.amount), Set("withdrawn"))) { event =>
        updateState(event.payload.asInstanceOf[MoneyWithdrawn])
      }
  }

  def updateState(evt: Event): Unit = {
    evt match {
      case checkingsAccountCreated: CheckingsAccountCreated =>
        state = Some(CheckingsAccount(checkingsAccountCreated.id, checkingsAccountCreated.balance))
        balance = checkingsAccountCreated.balance
    }
  }

  override def persistenceId: String = s"account-$id"
} 

//设置package包名称以及导入依赖的类
package im.actor.server.cqrs

import akka.actor.ExtendedActorSystem
import akka.persistence.journal.{ Tagged, EventSeq, EventAdapter }

final class ActorEventAdapter(system: ExtendedActorSystem) extends EventAdapter {
  override def manifest(event: Any): String = "V1"

  override def toJournal(event: Any): Any = {
    event match {
      case e: TaggedEvent ? Tagged(e, e.tags)
      case _              ? event
    }
  }

  override def fromJournal(event: Any, manifest: String): EventSeq =
    event match {
      case e: AnyRef ? EventSeq(e)
      case _         ? throw new IllegalArgumentException(s"Supported AnyRef but got: ${event.getClass}")
    }

} 

//设置package包名称以及导入依赖的类
package module9

import akka.actor._
import akka.persistence._
import java.util.Date

// commands
final case class CreateProduct(name: String, description: String)

// events
trait DomainEvent { val occurredOn = new Date() }
final case class ProductCreated(productId: String, name: String, description: String)

class Product(productId: String) extends PersistentActor {
  
  override def persistenceId = productId
  
  var state: Option[ProductState] = None
  
  override def receiveCommand: Receive = {
    case command: CreateProduct =>
      persist(ProductCreated(productId, command.name, command.description)) { event =>
        updateWith(event)
      }
  }
  
  override def receiveRecover: Receive = {
    case event: ProductCreated =>
      updateWith(event)
  }
  
  def updateWith(event: ProductCreated) {
    state = Some(ProductState(event.name, event.description))
  }
}

protected final case class ProductState(name: String, description: String)

import akka.persistence.journal.{Tagged, WriteEventAdapter}

class ProductEventsTaggingAdapter extends WriteEventAdapter {
  override def manifest(event: Any): String = ""
  
  override def toJournal(event: Any): Any = {
    println(s"TAGGING product: $event")
    Tagged(event, Set("product"))
  }
} 

//设置package包名称以及导入依赖的类
package backend

import akka.persistence.journal.{ Tagged, WriteEventAdapter }
import model.write.Order
import model.write.OrderProtocol.OrderEvent

class TagWriterEventAdapter extends WriteEventAdapter {

  def manifest(event: Any): String = ""

  def toJournal(event: Any): Any = {
    event match {

      // Order events get tagged with Order tag!
      case evt: OrderEvent => Tagged(evt, Set(Order.tag.value))

      // other events are not tagged
      case evt => evt
    }
  }
} 

//设置package包名称以及导入依赖的类
package poc.persistence.write

import java.nio.charset.Charset

import akka.actor.ExtendedActorSystem
import akka.event.Logging
import akka.persistence.journal.{Tagged, WriteEventAdapter}
import org.json4s.DefaultFormats
import poc.persistence.events.{OrderCancelled, OrderInitialized}

class OrderTaggingEventAdapter(actorSystem: ExtendedActorSystem) extends WriteEventAdapter {

  private val log = Logging.getLogger(actorSystem, this)

  override def toJournal(event: Any): Any = event match {
    case e: OrderInitialized =>
      log.debug("tagging OrderInitialized event")
      Tagged(e, Set("UserEvent"))
    case e: OrderCancelled =>
      log.debug("tagged OrderCancelled event")
      Tagged(e, Set("UserEvent"))
  }

  override def manifest(event: Any): String = ""
}

import akka.serialization.Serializer

class EventSerialization(actorSystem: ExtendedActorSystem) extends Serializer {

  import org.json4s.jackson.Serialization.{read, write}

  private val log = Logging.getLogger(actorSystem, this)

  val UTF8: Charset = Charset.forName("UTF-8")

  implicit val formats = DefaultFormats

  // Completely unique value to identify this implementation of Serializer, used to optimize network traffic.
  // Values from 0 to 16 are reserved for Akka internal usage.
  // Make sure this does not conflict with any other kind of serializer or you will have problems
  override def identifier: Int = 90020001

  override def includeManifest = true

  override def fromBinary(bytes: Array[Byte], manifestOpt: Option[Class[_]]): AnyRef = {
    implicit val manifest = manifestOpt match {
      case Some(x) => Manifest.classType(x)
      case None => Manifest.AnyRef
    }
    val str = new String(bytes, UTF8)
    val result = read(str)
    result
  }

  override def toBinary(o: AnyRef): Array[Byte] = {
    val jsonString = write(o)
    val dat = write(o).getBytes(UTF8)
    dat
  }
} 

//设置package包名称以及导入依赖的类
package de.htw.pgerhard

import akka.persistence.journal.{Tagged, WriteEventAdapter}
import de.htw.pgerhard.domain.users.events._
import de.htw.pgerhard.domain.tweets.events._

class TaggingEventAdapter extends WriteEventAdapter {

  override def toJournal(event: Any): Any = event match {

    case ev: UserRegisteredEvent          ? Tagged(event, Set("user-event", "user-registered"))
    case ev: UserNameSetEvent             ? Tagged(event, Set("user-event", "user-name-set"))
    case ev: UserSubscriptionAddedEvent   ? Tagged(event, Set("user-event", "user-subscription-added"))
    case ev: UserSubscriptionRemovedEvent ? Tagged(event, Set("user-event", "user-subscription-removed"))
    case ev: UserDeletedEvent             ? Tagged(event, Set("user-event", "user-deleted"))

    case ev: TweetPostedEvent             ? Tagged(event, Set("tweet-event", "tweet-posted"))
    case ev: TweetRepostedEvent           ? Tagged(event, Set("tweet-event", "tweet-reposted"))
    case ev: TweetRepostDeletedEvent      ? Tagged(event, Set("tweet-event", "tweet-repost-deleted"))
//    case ev: TweetLikedEvent              ? Tagged(event, Set("tweet-event", "tweet-liked"))
//    case ev: TweetUnLikedEvent            ? Tagged(event, Set("tweet-event", "tweet-unliked"))
    case ev: TweetDeletedEvent            ? Tagged(event, Set("tweet-event", "tweet-deleted"))

    case _ ? event
  }

  override def manifest(event: Any): String = ""
} 

//设置package包名称以及导入依赖的类
package com.packt.masteringakka.bookstore.common

import akka.persistence.journal.EventAdapter
import akka.persistence.journal.EventSeq
import com.google.protobuf.Message
import akka.persistence.journal.Tagged


class ProtobufDatamodelAdapter extends EventAdapter{
  override def manifest(event:Any) = event.getClass.getName
    
  override def toJournal(event:Any) = event match {
    case ev:EntityEvent with DatamodelWriter => 
      val message = ev.toDatamodel
      
      //Add tags for the entity type and the event class name
      val eventType = ev.getClass.getName().toLowerCase().split("\\$").last
      Tagged(message, Set(ev.entityType, eventType))      
      
    case _ => throw new RuntimeException(s"Protobuf adapter can't write adapt type: $event")
  }
  
  override def fromJournal(event:Any, manifest:String) = {
    event match{
      case m:Message =>
        //Reflect to get the companion for the domain class that was serialized and then
        //use that to perform the conversion back into the domain model
        val reader = Class.forName(manifest + "$").getField("MODULE$").get(null).asInstanceOf[DatamodelReader]
        reader.
          fromDatamodel.
          lift(m).
          map(EventSeq.single).
          getOrElse(throw readException(event))        
        
      case _ => throw readException(event)
    }    
  }
  
  private def readException(event:Any) = new RuntimeException(s"Protobuf adapter can't read adapt for type: $event")
}