Scala AggregateEvent类代码示例

//设置package包名称以及导入依赖的类
package sample.helloworldconsumer.impl



import akka.Done
import akka.persistence.query.Offset
import akka.stream.Materializer
import akka.stream.scaladsl.{Sink, Source}
import com.lightbend.lagom.scaladsl.persistence.ReadSideProcessor.ReadSideHandler
import com.lightbend.lagom.scaladsl.persistence.{AggregateEvent, EventStreamElement, ReadSide, ReadSideProcessor}

import scala.concurrent.{ExecutionContext, Future}


class ReadSideTestDriver(implicit val materializer: Materializer, ec: ExecutionContext) extends ReadSide {
  private var processors = Map.empty[Class[_], Seq[Future[(ReadSideHandler[_], Offset)]]]

  override def register[Event <: AggregateEvent[Event]](processorFactory: => ReadSideProcessor[Event]): Unit = {
    val processor = processorFactory
    val eventTags = processor.aggregateTags
    val handler = processor.buildHandler()
    val future = for {
      _ <- handler.globalPrepare()
      offset <- handler.prepare(eventTags.head)
    } yield {
      handler -> offset
    }
    synchronized {
      val handlers = processors.getOrElse(eventTags.head.eventType, Nil)
      processors += (eventTags.head.eventType -> (handlers :+ future))
    }
  }

  def feed[Event <: AggregateEvent[Event]](entityId: String, event: Event, offset: Offset): Future[Done] = {
    processors.get(event.aggregateTag.eventType) match {
      case None => sys.error(s"No processor registered for Event ${event.aggregateTag.eventType.getCanonicalName}")
      case Some(handlerFutures) =>
        for {
          handlers <- Future.sequence(handlerFutures)
          _ <- Future.sequence(handlers.map {
            case (handler: ReadSideHandler[Event], _) =>
              Source.single(new EventStreamElement(entityId, event, offset))
                .via(handler.handle())
                .runWith(Sink.ignore)
          })
        } yield {
          Done
        }
    }
  }
} 

//设置package包名称以及导入依赖的类
package demo.impl.basket

import akka.{Done, NotUsed}
import com.lightbend.lagom.scaladsl.persistence.PersistentEntity.ReplyType
import com.lightbend.lagom.scaladsl.persistence.{AggregateEvent, AggregateEventTag, PersistentEntity}
import com.lightbend.lagom.scaladsl.playjson.JsonSerializer
import demo.api.basket.{Basket, Item}
import play.api.libs.json.{Format, Json}

object BasketEntityFormats {
  implicit val addItemFormat: Format[AddItem] = Json.format
  implicit val getBasketFormat: Format[GetBasket.type] = JsonSerializer.emptySingletonFormat(GetBasket)
  implicit val itemAddedFormat: Format[ItemAdded] = Json.format
  implicit val basketEntityStateFormat: Format[BasketEntityState] = Json.format
}

trait BasketEntityCommand
case class AddItem(item: Item) extends BasketEntityCommand with ReplyType[Done]
case object GetBasket extends BasketEntityCommand with ReplyType[Basket]

case class BasketEntityState(currentBasket: Basket)
object BasketEntityState{
  val initial = BasketEntityState(Basket(Seq(), 0))
}

sealed trait BasketEntityEvent extends AggregateEvent[BasketEntityEvent] {
  override def aggregateTag = BasketEntityEvent.Tag
}

object BasketEntityEvent {
  val Tag = AggregateEventTag.sharded[BasketEntityEvent](4)
}

case class ItemAdded(item: Item) extends BasketEntityEvent

final class BasketEntity extends PersistentEntity {
  override type Command = BasketEntityCommand
  override type Event = BasketEntityEvent
  override type State = BasketEntityState

  override def initialState = BasketEntityState.initial

  override def behavior: Behavior = {
    Actions()
      .onCommand[AddItem, Done] {
        case (AddItem(item), ctx, state) =>
          ctx.thenPersist(ItemAdded(item))(_ => ctx.reply(Done))
      }
      .onReadOnlyCommand[GetBasket.type, Basket] {
        case (GetBasket, ctx, state) => ctx.reply(state.currentBasket)
      }
      .onEvent {
        case (ItemAdded(item), state) => {
          val newItems = state.currentBasket.items :+ item
          state.copy(Basket(newItems, newItems.map(_.price).sum))
        }
      }
  }
} 

//设置package包名称以及导入依赖的类
package com.grossbit.user.impl.persistance.event

import java.util.UUID

import com.grossbit.user.api.ResponseDone
import com.lightbend.lagom.scaladsl.persistence.{AggregateEvent, AggregateEventTag, AggregateEventTagger}
import play.api.libs.json.{Format, Json}


sealed trait UserEvent extends  AggregateEvent[UserEvent]{
  override def aggregateTag: AggregateEventTagger[UserEvent] = UserEvent.UserEventTag

}
object UserEvent{
  val NumShards=4
  val UserEventTag = AggregateEventTag.sharded[UserEvent](NumShards)
}

case class UserCreated(uuid:String,name: String, email: String, password: String) extends UserEvent
case class UserUpdated(uuid:String,name: String, email: String, password: String) extends UserEvent
case class UserDeleted(name: String) extends UserEvent

object UserCreated {
  implicit val format: Format[UserCreated] = Json.format
}
object UserUpdated {
  implicit val format: Format[UserUpdated] = Json.format
}
object UserDeleted {
  implicit val format: Format[UserDeleted] = Json.format
} 

//设置package包名称以及导入依赖的类
package com.example.auction.item.impl

import akka.Done
import akka.persistence.query.Offset
import akka.stream.Materializer
import akka.stream.scaladsl.{Sink, Source}
import com.lightbend.lagom.scaladsl.persistence.ReadSideProcessor.ReadSideHandler
import com.lightbend.lagom.scaladsl.persistence.{AggregateEvent, EventStreamElement, ReadSide, ReadSideProcessor}

import scala.concurrent.{ExecutionContext, Future}


class ReadSideTestDriver(implicit val materializer: Materializer, ec: ExecutionContext) extends ReadSide {
  private var processors = Map.empty[Class[_], Seq[Future[(ReadSideHandler[_], Offset)]]]

  override def register[Event <: AggregateEvent[Event]](processorFactory: => ReadSideProcessor[Event]): Unit = {
    val processor = processorFactory
    val eventTags = processor.aggregateTags
    val handler = processor.buildHandler()
    val future = for {
      _ <- handler.globalPrepare()
      offset <- handler.prepare(eventTags.head)
    } yield {
      handler -> offset
    }
    synchronized {
      val handlers = processors.getOrElse(eventTags.head.eventType, Nil)
      processors += (eventTags.head.eventType -> (handlers :+ future))
    }
  }

  def feed[Event <: AggregateEvent[Event]](entityId: String, event: Event, offset: Offset): Future[Done] = {
    processors.get(event.aggregateTag.eventType) match {
      case None => sys.error(s"No processor registered for Event ${event.aggregateTag.eventType.getCanonicalName}")
      case Some(handlerFutures) =>
        for {
          handlers <- Future.sequence(handlerFutures)
          _ <- Future.sequence(handlers.map {
            case (handler: ReadSideHandler[Event], _) =>
              Source.single(new EventStreamElement(entityId, event, offset))
                .via(handler.handle())
                .runWith(Sink.ignore)
          })
        } yield {
          Done
        }
    }
  }
} 

//设置package包名称以及导入依赖的类
package org.wex.cmsfs.monitor.impl

import com.lightbend.lagom.scaladsl.persistence.{AggregateEvent, AggregateEventTag}
import org.wex.cmsfs.monitor.api.Monitor
import play.api.libs.json.{Format, Json}

sealed trait MonitorEvent extends AggregateEvent[MonitorEvent] {
  override def aggregateTag = MonitorEvent.Tag
}

object MonitorEvent {
  val NumShards = 1
  val Tag = AggregateEventTag.sharded[MonitorEvent](NumShards)
}

case class MonitorCreated(monitor: Monitor) extends MonitorEvent

object MonitorCreated {
  implicit val format: Format[MonitorCreated] = Json.format
} 

//设置package包名称以及导入依赖的类
package com.example.exone.api

import com.lightbend.lagom.scaladsl.api.Service
import com.lightbend.lagom.scaladsl.api.broker.Topic
import com.lightbend.lagom.scaladsl.persistence.{AggregateEvent, AggregateEventTag, AggregateEventTagger}
import play.api.libs.json.{Format, Json}

object ExOneService {

  val TOPIC_NAME = "exoneEvents"

}


trait ExOneService extends Service {

  def exOneEvents(): Topic[ExOneEvent]

  override final def descriptor = {
    import Service._
    named("exonedocs").withTopics(
      topic(ExOneService.TOPIC_NAME, exOneEvents)
    ).withAutoAcl(true)
  }

}

case class ExOneEvent(id:String, value:String) extends AggregateEvent[ExOneEvent]{
  override def aggregateTag: AggregateEventTagger[ExOneEvent] = ExOneEvent.Tag
}
object ExOneEvent{
  val NumShards = 4
  val Tag = AggregateEventTag.sharded[ExOneEvent](4)
  implicit val format: Format[ExOneEvent] = Json.format[ExOneEvent]
} 

//设置package包名称以及导入依赖的类
package com.example.counter.impl

import akka.Done
import com.lightbend.lagom.scaladsl.persistence.PersistentEntity.ReplyType
import com.lightbend.lagom.scaladsl.persistence.{AggregateEvent, AggregateEventTag, PersistentEntity}
import com.lightbend.lagom.scaladsl.playjson.{JsonSerializer, JsonSerializerRegistry}
import play.api.libs.json.Json

import scala.collection.immutable.Seq

class CounterEntity extends PersistentEntity {
  type Command = CounterCommand[_]
  type Event = CounterEvent
  type State = CounterState

  def initialState = CounterState(0)

  def behavior = {
    case CounterState(_) => Actions()
      .onCommand[Add, Done] { case (Add(x), ctx, _) => ctx.thenPersist(Added(x)) { _ => ctx.reply(Done) } }
      .onReadOnlyCommand[GetState.type, Int] { case (GetState, ctx, CounterState(n)) => ctx.reply(n) }
      .onEvent { case (Added(x), CounterState(n)) => CounterState(n + x) }
  }
}

case class CounterState(n: Int)
object CounterState { implicit val format = Json.format[CounterState] }

sealed trait CounterEvent extends AggregateEvent[CounterEvent] { def aggregateTag = CounterEvent.Tag }
object CounterEvent { val Tag = AggregateEventTag[CounterEvent] }
case class Added(n: Int) extends CounterEvent
object Added { implicit val format = Json.format[Added] }

sealed trait CounterCommand[R] extends ReplyType[R]
case class Add(n: Int) extends CounterCommand[Done]
object Add { implicit val format = Json.format[Add] }
case object GetState extends CounterCommand[Int] { implicit val format = JsonSerializer.emptySingletonFormat(GetState) }

object CounterSerializerRegistry extends JsonSerializerRegistry {
  override def serializers: Seq[JsonSerializer[_]] = Seq(
    JsonSerializer[Add],
    JsonSerializer[Added],
    JsonSerializer[CounterState],
    JsonSerializer[GetState.type]
  )
} 

//设置package包名称以及导入依赖的类
package io.digitalcat.publictransportation.services.identity.impl

import java.util.UUID

import com.lightbend.lagom.scaladsl.persistence.{AggregateEvent, AggregateEventShards, AggregateEventTag}
import play.api.libs.json.{Format, Json}

object IdentityEvent {
  val NumShards = 5
  val Tag = AggregateEventTag.sharded[IdentityEvent]("IdentityEvent", NumShards)
}

sealed trait IdentityEvent extends AggregateEvent[IdentityEvent] {
  override def aggregateTag(): AggregateEventShards[IdentityEvent] = IdentityEvent.Tag
}

case class ClientCreated(company: String) extends IdentityEvent
object ClientCreated {
  implicit val format: Format[ClientCreated] = Json.format
}

case class UserCreated(userId: UUID, firstName: String, lastName: String, email: String, username: String, hashedPassword: String) extends IdentityEvent
object UserCreated {
  implicit val format: Format[UserCreated] = Json.format
} 

//设置package包名称以及导入依赖的类
package docs.home.scaladsl.persistence

import com.lightbend.lagom.scaladsl.persistence.AggregateEventShards
import com.lightbend.lagom.scaladsl.persistence.AggregateEvent
import com.lightbend.lagom.scaladsl.persistence.AggregateEventTag

class ShardedBlogEventTag {

  //#sharded-tags
  object BlogEvent {
    val NumShards = 20
    val Tag = AggregateEventTag.sharded[BlogEvent](NumShards)
  }

  sealed trait BlogEvent extends AggregateEvent[BlogEvent] {
    override def aggregateTag: AggregateEventShards[BlogEvent] = BlogEvent.Tag
  }
  //#sharded-tags
} 

//设置package包名称以及导入依赖的类
package docs.home.scaladsl.persistence

import com.lightbend.lagom.scaladsl.persistence.AggregateEventShards
import com.lightbend.lagom.scaladsl.persistence.AggregateEvent
import com.lightbend.lagom.scaladsl.persistence.AggregateEventTag

class BlogEventTag {

  //#aggregate-tag
  object BlogEvent {
    val BlogEventTag = AggregateEventTag[BlogEvent]
  }

  sealed trait BlogEvent extends AggregateEvent[BlogEvent] {
    override def aggregateTag: AggregateEventTag[BlogEvent] =
      BlogEvent.BlogEventTag
  }
  //#aggregate-tag
} 

//设置package包名称以及导入依赖的类
package docs.home.scaladsl.persistence

//#full-example
import com.lightbend.lagom.scaladsl.persistence.AggregateEvent
import com.lightbend.lagom.scaladsl.persistence.AggregateEventShards
import com.lightbend.lagom.scaladsl.persistence.AggregateEventTag
import com.lightbend.lagom.scaladsl.playjson.JsonSerializer

object BlogEvent {
  val NumShards = 20
  // second param is optional, defaults to the class name
  val Tag = AggregateEventTag.sharded[BlogEvent](NumShards)

  import play.api.libs.json._
  private implicit val postContentFormat = Json.format[PostContent]

  val serializers = Vector(
    JsonSerializer(Json.format[PostAdded]),
    JsonSerializer(Json.format[BodyChanged]),
    JsonSerializer(Json.format[PostPublished]))
}

sealed trait BlogEvent extends AggregateEvent[BlogEvent] {
  override def aggregateTag: AggregateEventShards[BlogEvent] = BlogEvent.Tag
}

final case class PostAdded(postId: String, content: PostContent) extends BlogEvent

final case class BodyChanged(postId: String, body: String) extends BlogEvent

final case class PostPublished(postId: String) extends BlogEvent
//#full-example 

//设置package包名称以及导入依赖的类
package com.lightbend.lagom.internal.scaladsl.persistence.cassandra

import akka.Done
import akka.actor.ActorSystem
import com.datastax.driver.core.BoundStatement
import com.lightbend.lagom.internal.persistence.cassandra.CassandraOffsetStore
import com.lightbend.lagom.scaladsl.persistence.ReadSideProcessor.ReadSideHandler
import com.lightbend.lagom.scaladsl.persistence.cassandra.CassandraReadSide.ReadSideHandlerBuilder
import com.lightbend.lagom.scaladsl.persistence.cassandra.{ CassandraReadSide, CassandraSession }
import com.lightbend.lagom.scaladsl.persistence.{ AggregateEvent, AggregateEventTag, EventStreamElement }

import scala.collection.immutable
import scala.concurrent.Future
import scala.reflect.ClassTag


private[lagom] final class CassandraReadSideImpl(
  system: ActorSystem, session: CassandraSession, offsetStore: CassandraOffsetStore
) extends CassandraReadSide {

  private val dispatcher = system.settings.config.getString("lagom.persistence.read-side.use-dispatcher")
  implicit val ec = system.dispatchers.lookup(dispatcher)

  override def builder[Event <: AggregateEvent[Event]](eventProcessorId: String): ReadSideHandlerBuilder[Event] = {
    new ReadSideHandlerBuilder[Event] {
      import CassandraAutoReadSideHandler.Handler
      private var prepareCallback: AggregateEventTag[Event] => Future[Done] = tag => Future.successful(Done)
      private var globalPrepareCallback: () => Future[Done] = () => Future.successful(Done)
      private var handlers = Map.empty[Class[_ <: Event], Handler[Event]]

      override def setGlobalPrepare(callback: () => Future[Done]): ReadSideHandlerBuilder[Event] = {
        globalPrepareCallback = callback
        this
      }

      override def setPrepare(callback: (AggregateEventTag[Event]) => Future[Done]): ReadSideHandlerBuilder[Event] = {
        prepareCallback = callback
        this
      }

      override def setEventHandler[E <: Event: ClassTag](handler: EventStreamElement[E] => Future[immutable.Seq[BoundStatement]]): ReadSideHandlerBuilder[Event] = {
        val eventClass = implicitly[ClassTag[E]].runtimeClass.asInstanceOf[Class[Event]]
        handlers += (eventClass -> handler.asInstanceOf[Handler[Event]])
        this
      }

      override def build(): ReadSideHandler[Event] = {
        new CassandraAutoReadSideHandler[Event](session, offsetStore, handlers, globalPrepareCallback, prepareCallback, eventProcessorId, dispatcher)
      }
    }
  }
} 

//设置package包名称以及导入依赖的类
package io.namelos.journal.impl

import akka.Done
import com.lightbend.lagom.scaladsl.persistence.PersistentEntity.ReplyType
import com.lightbend.lagom.scaladsl.persistence.{AggregateEvent, AggregateEventTag, PersistentEntity}
import com.lightbend.lagom.scaladsl.playjson.{JsonSerializer, JsonSerializerRegistry}
import play.api.libs.json.Json

import scala.collection.immutable.Seq

class JournalEntity extends PersistentEntity {
  type Command = JournalCommand[_]
  type Event = JournalEvent
  type State = JournalState

  def initialState = JournalState(0)

  def behavior = {
    case JournalState(_) => Actions()
      .onCommand[Add, Done] { case (Add(x), ctx, _) => ctx.thenPersist(Added(x)) { _ => ctx.reply(Done) } }
      .onReadOnlyCommand[GetState.type, Int] { case (GetState, ctx, JournalState(n)) => ctx.reply(n) }
      .onEvent { case (Added(x), JournalState(n)) => JournalState(n + x) }
  }
}

case class JournalState(n: Int)
object JournalState { implicit val format = Json.format[JournalState] }

sealed trait JournalEvent extends AggregateEvent[JournalEvent] { def aggregateTag = JournalEvent.Tag }
object JournalEvent { val Tag = AggregateEventTag[JournalEvent] }
case class Added(n: Int) extends JournalEvent
object Added { implicit val format = Json.format[Added] }

sealed trait JournalCommand[R] extends ReplyType[R]
case class Add(n: Int) extends JournalCommand[Done]
object Add { implicit val format = Json.format[Add] }
case object GetState extends JournalCommand[Int] { implicit val format = JsonSerializer.emptySingletonFormat(GetState) }

object JournalSerializerRegistry extends JsonSerializerRegistry {
  override def serializers: Seq[JsonSerializer[_]] = Seq(
    JsonSerializer[Add],
    JsonSerializer[Added],
    JsonSerializer[JournalState],
    JsonSerializer[GetState.type]
  )
} 

//设置package包名称以及导入依赖的类
package com.livelygig.product.message.impl

import com.lightbend.lagom.scaladsl.persistence.{AggregateEvent, AggregateEventTag, AggregateEventTagger}
import com.lightbend.lagom.scaladsl.playjson.Jsonable
import com.livelygig.product.message.api.Message
import play.api.libs.json.Json


sealed trait MessageEvent extends AggregateEvent[MessageEvent] with Jsonable  {
  override def aggregateTag: AggregateEventTagger[MessageEvent] = MessageEvent.Tag
}

object MessageEvent {
  val NumShards = 4
  val Tag = AggregateEventTag.sharded[MessageEvent](NumShards)
}

case class MessagePosted(message: Message) extends MessageEvent

object MessagePosted {
  implicit val format = Json.format[MessagePosted]
} 

//设置package包名称以及导入依赖的类
package com.livelygig.product.user.impl

import com.lightbend.lagom.scaladsl.persistence.{AggregateEvent, AggregateEventTag, AggregateEventTagger}
import com.lightbend.lagom.scaladsl.playjson.Jsonable
import com.livelygig.product.user.api.User
import play.api.libs.json.{Format, Json}


sealed trait UserEvent extends AggregateEvent[UserEvent] with Jsonable  {
  override def aggregateTag: AggregateEventTagger[UserEvent] = UserEvent.Tag
}

object UserEvent {
  val NumShards = 4
  val Tag = AggregateEventTag.sharded[UserEvent](NumShards)
}

case class UserCreated(user: User) extends UserEvent

object UserCreated {
  implicit val format: Format[UserCreated] = Json.format
}