Scala PersistentEntity类代码示例

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

import akka.Done
import com.lightbend.lagom.scaladsl.persistence.PersistentEntity


class MessageEntity extends PersistentEntity {

  override type Command = MessageCommand[_]
  override type Event = MessageEvent
  override type State = MessageState

  override def initialState = MessageState("", LocalDateTime.now().toString)

  override def behavior: Behavior = {
    case MessageState(msg, _) => Actions().onCommand[SaveNewMessage, Done]{
      case (SaveNewMessage(msg), ctx, state) =>
        println(s"observe new message from kafka and save ${msg}")

        ctx.thenPersist( MessageSaved(msg)) { msgSaved: MessageSaved =>
          ctx.reply(Done)
        }
    }.onEvent {
      case (MessageSaved(message), state) =>
        println(s"MessgaeSaved event fire ...")

        MessageState(message, LocalDateTime.now().toString)
    }
  }
} 

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

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

object OrderEntityFormats {
  implicit val orderItemsFormat: Format[OrderItems] = Json.format
  implicit val createOrderFormat: Format[CreateOrder] = Json.format
  implicit val getOrderFormat = JsonSerializer.emptySingletonFormat(GetOrder)
  implicit val orderInitialisedFormat: Format[OrderInitialized] = Json.format
  implicit val orderStateFormat: Format[OrderState] = Json.format
}

case class OrderItems (items: Seq[String])

trait OrderCommand
case class CreateOrder(items: Seq[String]) extends OrderCommand with ReplyType[Done]
case object GetOrder extends OrderCommand with ReplyType[OrderItems]

trait OrderEvent
case class OrderInitialized(items: Seq[String]) extends OrderEvent
case class OrderState(items: Seq[String])

object OrderState {
  def empty = OrderState(Seq())
}

class Order extends PersistentEntity {
  override type Command = OrderCommand
  override type Event = OrderEvent
  override type State = OrderState

  override def initialState = OrderState.empty

  override def behavior: Behavior = Actions()
    .onCommand[CreateOrder, Done] {
      case (CreateOrder(items), ctx, state) => {
        ctx.thenPersist(OrderInitialized(items)){
          evt => ctx.reply(Done)
        }
      }
    }
    .onReadOnlyCommand[GetOrder.type, OrderItems] {
      case (GetOrder, ctx, state) => ctx.reply(OrderItems(state.items))
    }
    .onEvent{
      case (OrderInitialized(items), state) => OrderState(items)
    }
} 

//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 org.wex.cmsfs.monitor.impl

import akka.Done
import com.lightbend.lagom.scaladsl.persistence.PersistentEntity
import org.wex.cmsfs.monitor.api.Monitor

class MonitorEntity extends PersistentEntity {

  override type Command = MonitorCommand
  override type Event = MonitorEvent
  override type State = Option[Monitor]

  override def initialState = None

  override def behavior: Behavior = {
    case None => notCreated
  }

  private val notCreated = {
    Actions().onCommand[CreateMonitor, Done] {
      case (CreateMonitor(monitor), ctx, _) =>
        ctx.thenPersist(MonitorCreated(monitor))(_ => ctx.reply(Done))
    }.onEvent {
      case (MonitorCreated(monitor), _) => Some(monitor)
    }
  }
} 

//设置package包名称以及导入依赖的类
package com.packt.chapter11.trip.impl

import java.util.Date
import akka.Done
import com.lightbend.lagom.scaladsl.persistence.PersistentEntity

class ClientEntity extends PersistentEntity {
  override type Command = ClientCommand[_]
  override type Event = ClientEvent
  override type State = ClientState

  override def initialState = ClientState(false, Nil)

  override def behavior: Behavior =
    Actions()
      .onCommand[StartTrip.type, Done] {
      case (_, ctx, state) if !state.tripInProgress =>
        ctx.thenPersist(TripStarted(new Date().getTime)) { _ => ctx.reply(Done) }
      case (_, ctx, _) =>
        ctx.invalidCommand("The trip has started already.")
        ctx.done
    }
      .onCommand[EndTrip.type, Done] {
      case (_, ctx, state) if state.tripInProgress =>
        ctx.thenPersist(TripEnded(new Date().getTime)) { _ => ctx.reply(Done) }
      case (_, ctx, _)  =>
        ctx.invalidCommand("The trip has not started.")
        ctx.done
    }
      .onCommand[AddLocation, Done] {
      case (AddLocation(req), ctx, state) if state.tripInProgress =>
        ctx.thenPersist(LocationAdded(Location(req.latitude, req.longitude))) { _ => ctx.reply(Done) }
      case (_, ctx, _) =>
        ctx.invalidCommand("The trip has not started.")
        ctx.done
    }
      .onEvent {
        case (TripStarted(_), _) => ClientState(true, Nil)
        case (TripEnded(_), _) => ClientState(false, Nil)
        case (LocationAdded(loc), state) => state.copy(locations = state.locations :+ loc)
      }
} 

//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 com.lightbend.lagom.scaladsl.persistence.PersistentEntity
import io.digitalcat.publictransportation.services.common.response.GeneratedIdDone
import io.digitalcat.publictransportation.services.identity.api.response.IdentityStateDone
import play.api.libs.json.{Format, Json}

sealed trait IdentityCommand

case class RegisterClient(
 company: String,
 firstName: String,
 lastName: String,
 email: String,
 username: String,
 password: String
) extends PersistentEntity.ReplyType[GeneratedIdDone] with IdentityCommand
object RegisterClient {
  implicit val format: Format[RegisterClient] = Json.format
}

case class CreateUser(
 firstName: String,
 lastName: String,
 email: String,
 username: String,
 password: String
) extends PersistentEntity.ReplyType[GeneratedIdDone] with IdentityCommand
object CreateUser {
  implicit val format: Format[CreateUser] = Json.format
}

case class GetIdentityState() extends PersistentEntity.ReplyType[IdentityStateDone] with IdentityCommand 

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

import java.time.LocalDateTime

import akka.Done
import com.lightbend.lagom.scaladsl.persistence.PersistentEntity


class MessageEntity extends PersistentEntity {

  override type Command = MessageCommand[_]
  override type Event = MessageEvent
  override type State = MessageState

  override def initialState = MessageState("", LocalDateTime.now().toString)

  override def behavior: Behavior = {
    case MessageState(msg, _) => Actions().onCommand[SaveNewMessage, Done] {
      case (SaveNewMessage(msg), ctx, state) =>
        println(s"observe new message from kafka and save ${msg}")
        ctx.thenPersist(MessageSaved(msg)) { msgSaved: MessageSaved =>
          ctx.reply(Done)
        }
    }.onEvent {
      case (MessageSaved(message), state) =>
        println(s"MessageSaved event fire ...")

        MessageState(message, LocalDateTime.now().toString)
    }
  }
} 

//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.PersistentEntity

final class Post3 extends PersistentEntity {

  override type Command = BlogCommand
  override type Event = BlogEvent
  override type State = BlogState

  override def initialState: BlogState = BlogState.empty

  //#same-behavior
  override def behavior: Behavior =
    Actions()
      .onCommand[AddPost, AddPostDone] {
        case (AddPost(content), ctx, state) if state.isEmpty =>
          ctx.thenPersist(PostAdded(entityId, content)) { evt =>
            ctx.reply(AddPostDone(entityId))
          }
      }
      .onEvent {
        case (PostAdded(postId, content), state) =>
          BlogState(Some(content), published = false)
      }
      .onReadOnlyCommand[GetPost.type, PostContent] {
        case (GetPost, ctx, state) if !state.isEmpty =>
          ctx.reply(state.content.get)
      }
  //#same-behavior
} 

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

import akka.actor.ActorSystem
import akka.persistence.jdbc.query.scaladsl.JdbcReadJournal
import akka.persistence.query.scaladsl.EventsByTagQuery
import akka.persistence.query.{ NoOffset, Offset, PersistenceQuery, Sequence }
import com.lightbend.lagom.internal.persistence.jdbc.SlickProvider
import com.lightbend.lagom.internal.scaladsl.persistence.AbstractPersistentEntityRegistry
import com.lightbend.lagom.scaladsl.persistence.PersistentEntity


private[lagom] final class JdbcPersistentEntityRegistry(system: ActorSystem, slickProvider: SlickProvider)
  extends AbstractPersistentEntityRegistry(system) {

  private lazy val ensureTablesCreated = slickProvider.ensureTablesCreated()

  override def register(entityFactory: => PersistentEntity): Unit = {
    ensureTablesCreated
    super.register(entityFactory)
  }

  override protected val journalId: String = JdbcReadJournal.Identifier
  private val jdbcReadJournal = PersistenceQuery(system).readJournalFor[JdbcReadJournal](journalId)
  override protected val eventsByTagQuery: Option[EventsByTagQuery] = Some(jdbcReadJournal)

  override protected def mapStartingOffset(storedOffset: Offset): Offset = storedOffset match {
    case NoOffset        => NoOffset
    case Sequence(value) => Sequence(value + 1)
    case other =>
      throw new IllegalArgumentException(s"JDBC does not support ${other.getClass.getSimpleName} offsets")
  }

} 

//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]
  )
}