Scala EventStreamElement类代码示例

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

import com.lightbend.lagom.scaladsl.api.ServiceCall
import com.lightbend.lagom.scaladsl.api.broker.Topic
import com.lightbend.lagom.scaladsl.broker.TopicProducer
import com.lightbend.lagom.scaladsl.persistence.{EventStreamElement, PersistentEntityRegistry}
import sample.helloworld.api.model.GreetingMessage
import sample.helloworld.api.HelloService


class HelloServiceImpl(persistentEntityRegistry: PersistentEntityRegistry) extends HelloService {

  override def hello(id: String) = ServiceCall { _ =>
    // Look up the Hello entity for the given ID.
    val ref = persistentEntityRegistry.refFor[HelloEntity](id)

    // Ask the entity the Hello command.
    ref.ask(Hello(id, None))
  }

  override def useGreeting(id: String) = ServiceCall { request =>
    // Look up the Hello entity for the given ID.
         val ref = persistentEntityRegistry.refFor[HelloEntity](id)

    // Tell the entity to use the greeting message specified.
    ref.ask(UseGreetingMessage(request.message))
  }

  override def greetingsTopic(): Topic[GreetingMessage] = {
    TopicProducer.singleStreamWithOffset {
      offset =>
        persistentEntityRegistry.eventStream(HelloEventTag.instance, offset)
          .map(ev => (convertEvent(ev), offset))
    }
  }

  private def convertEvent(helloEvent: EventStreamElement[HelloEvent]): GreetingMessage = {
    helloEvent.event match {
      case GreetingMessageChanged(msg) => GreetingMessage(msg)
    }
  }

} 

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

import akka.Done
import com.datastax.driver.core.{BoundStatement, PreparedStatement}
import com.lightbend.lagom.scaladsl.persistence.ReadSideProcessor.ReadSideHandler
import com.lightbend.lagom.scaladsl.persistence.cassandra.{CassandraReadSide, CassandraSession}
import com.lightbend.lagom.scaladsl.persistence.{AggregateEventTag, EventStreamElement, ReadSideProcessor}

import scala.concurrent.{ExecutionContext, Future}


class MessageEventProcessor(cassandraReadSide: CassandraReadSide, cassandraSession: CassandraSession)
                           (implicit ec: ExecutionContext) extends ReadSideProcessor[MessageEvent] {

  private var insertWordStmt: PreparedStatement = _

  override def buildHandler(): ReadSideHandler[MessageEvent] = {
    cassandraReadSide.builder[MessageEvent]("message_offset")
      .setGlobalPrepare(createTable)
      .setPrepare { tags =>
        prepareStatements
      }
      .setEventHandler[MessageSaved](insertWord)
      .build()
  }

  override def aggregateTags: Set[AggregateEventTag[MessageEvent]] = Set(MessageEventTag.INSTANCE)

  private def createTable(): Future[Done] = {
    for {
      _ <- cassandraSession.executeCreateTable(
        """        CREATE TABLE IF NOT EXISTS wordcounttest (
                      words text,
                      insertion_time timestamp,
                      PRIMARY KEY (words,insertion_time)
                    )WITH CLUSTERING ORDER BY (insertion_time DESC)
        """)
    } yield Done
  }

  private def prepareStatements(): Future[Done] = {
    for {
      insert <- cassandraSession.prepare(
        """insert into wordcounttest(words ,insertion_time) values(? ,toTimestamp(now())) """)
    } yield {
      insertWordStmt = insert
      Done
    }
  }

  private def insertWord(started: EventStreamElement[MessageSaved]): Future[List[BoundStatement]] = {
    Future.successful {
     val words = started.event.msg.replaceAll("[^\\p{L}\\p{Nd}]+", " ").split(" ").toList
     words.map{ word=> insertWordStmt.bind(word) }
    }
  }

} 

//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.NotUsed
import com.lightbend.lagom.scaladsl.api.ServiceCall
import com.lightbend.lagom.scaladsl.api.broker.Topic
import com.lightbend.lagom.scaladsl.broker.TopicProducer
import com.lightbend.lagom.scaladsl.persistence.PersistentEntity.InvalidCommandException
import com.lightbend.lagom.scaladsl.persistence.{EventStreamElement, PersistentEntityRegistry}
import demo.api.basket.{Basket, BasketService, ExtraTransportExceptions, Item}

import scala.collection.immutable
import scala.concurrent.ExecutionContext

class BasketServiceImpl(persistentEntities: PersistentEntityRegistry)(implicit ec: ExecutionContext)
  extends BasketService with ExtraTransportExceptions{
  override def getBasket(basketId: String): ServiceCall[NotUsed, Basket] = ServiceCall { req =>
    persistentEntities.refFor[BasketEntity](basketId).ask(GetBasket)
  }

  override def addItem(basketId: String): ServiceCall[Item, NotUsed] = ServiceCall { item =>
    persistentEntities.refFor[BasketEntity](basketId).ask(AddItem(item))
      .map(_ => NotUsed)
      .recoverWith {
        case e: InvalidCommandException => throw BadRequest(e.message)
      }
  }

  override def getTotal(basketId: String): ServiceCall[NotUsed, Int] = ServiceCall { req =>
    persistentEntities.refFor[BasketEntity](basketId).ask(GetTotal)
  }

  override def clearAll(basketId: String): ServiceCall[NotUsed, NotUsed] = ServiceCall { req =>
    persistentEntities.refFor[BasketEntity](basketId).ask(ClearAll)
      .map(x => NotUsed)
      .recoverWith {
        case e: InvalidCommandException => throw BadRequest(e.message)
      }
  }

  override def placeOrder(basketId: String): ServiceCall[NotUsed, NotUsed] = ServiceCall { req =>
    persistentEntities.refFor[BasketEntity](basketId).ask(PlaceOrder)
      .map(x => NotUsed)
      .recoverWith {
        case e: InvalidCommandException => throw BadRequest(e.message)
      }
  }

  override def placedOrders: Topic[demo.api.basket.OrderPlaced] =
      TopicProducer.taggedStreamWithOffset(BasketEntityEvent.Tag.allTags.to[immutable.Seq]) { (tag, offset) =>
        persistentEntities.eventStream(tag, offset).collect {
          case EventStreamElement(t, OrderPlaced(id, basket), o)  => {
            demo.api.basket.OrderPlaced(id, basket) -> o
          }
        }
    }
} 

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

import akka.NotUsed
import com.lightbend.lagom.scaladsl.api.ServiceCall
import com.lightbend.lagom.scaladsl.api.broker.Topic
import com.lightbend.lagom.scaladsl.broker.TopicProducer
import com.lightbend.lagom.scaladsl.persistence.PersistentEntity.InvalidCommandException
import com.lightbend.lagom.scaladsl.persistence.{EventStreamElement, PersistentEntityRegistry}
import demo.api.basket.{Basket, BasketService, ExtraTransportExceptions, Item}

import scala.collection.immutable
import scala.concurrent.ExecutionContext

class BasketServiceImpl(persistentEntities: PersistentEntityRegistry)(implicit ec: ExecutionContext)
  extends BasketService with ExtraTransportExceptions{
  override def getBasket(basketId: String): ServiceCall[NotUsed, Basket] = ServiceCall { req =>
    persistentEntities.refFor[BasketEntity](basketId).ask(GetBasket)
  }

  override def addItem(basketId: String): ServiceCall[Item, NotUsed] = ServiceCall { item =>
    persistentEntities.refFor[BasketEntity](basketId).ask(AddItem(item))
      .map(_ => NotUsed)
      .recoverWith {
        case e: InvalidCommandException => throw BadRequest(e.message)
      }
  }

  override def getTotal(basketId: String): ServiceCall[NotUsed, Int] = ServiceCall { req =>
    persistentEntities.refFor[BasketEntity](basketId).ask(GetTotal)
  }

  override def clearAll(basketId: String): ServiceCall[NotUsed, NotUsed] = ServiceCall { req =>
    persistentEntities.refFor[BasketEntity](basketId).ask(ClearAll)
      .map(x => NotUsed)
      .recoverWith {
        case e: InvalidCommandException => throw BadRequest(e.message)
      }
  }

  override def placeOrder(basketId: String): ServiceCall[NotUsed, NotUsed] = ServiceCall { req =>
    persistentEntities.refFor[BasketEntity](basketId).ask(PlaceOrder).map(_ => NotUsed)
  }

  override def placedOrders: Topic[demo.api.basket.OrderPlaced] =
      TopicProducer.taggedStreamWithOffset(BasketEntityEvent.Tag.allTags.to[immutable.Seq]) { (tag, offset) =>
        persistentEntities.eventStream(tag, offset).collect {
          case EventStreamElement(t, OrderPlaced(id, basket), o)  => {
            demo.api.basket.OrderPlaced(id, basket) -> o
          }
        }
    }
} 

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

import akka.NotUsed
import com.lightbend.lagom.scaladsl.api.ServiceCall
import com.lightbend.lagom.scaladsl.api.broker.Topic
import com.lightbend.lagom.scaladsl.broker.TopicProducer
import com.lightbend.lagom.scaladsl.persistence.{EventStreamElement, PersistentEntityRegistry}
import demo.api.basket.{Basket, BasketService, Item}

import scala.collection.immutable
import scala.concurrent.ExecutionContext

class BasketServiceImpl(persistentEntities: PersistentEntityRegistry)(implicit ec: ExecutionContext)
  extends BasketService {
  override def getBasket(basketId: String): ServiceCall[NotUsed, Basket] = ServiceCall { req =>
    persistentEntities.refFor[BasketEntity](basketId).ask(GetBasket)
  }

  override def addItem(basketId: String): ServiceCall[Item, NotUsed] = ServiceCall { item =>
    persistentEntities.refFor[BasketEntity](basketId).ask(AddItem(item)).map(_ => NotUsed)
  }

  override def getTotal(basketId: String): ServiceCall[NotUsed, Int] = ServiceCall { req =>
    persistentEntities.refFor[BasketEntity](basketId).ask(GetTotal)
  }

  override def clearAll(basketId: String): ServiceCall[NotUsed, NotUsed] = ServiceCall { req =>
    persistentEntities.refFor[BasketEntity](basketId).ask(ClearAll).map(x => NotUsed)
  }

  override def placeOrder(basketId: String): ServiceCall[NotUsed, NotUsed] = ServiceCall { req =>
    persistentEntities.refFor[BasketEntity](basketId).ask(PlaceOrder).map(_ => NotUsed)
  }

  override def placedOrders: Topic[demo.api.basket.OrderPlaced] =
      TopicProducer.taggedStreamWithOffset(BasketEntityEvent.Tag.allTags.to[immutable.Seq]) { (tag, offset) =>
        persistentEntities.eventStream(tag, offset).collect {
          case EventStreamElement(t, OrderPlaced(id, basket), o)  => {
            demo.api.basket.OrderPlaced(id, basket) -> o
          }
        }
    }
} 

//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 java.util.UUID

import akka.persistence.query.Offset
import com.datastax.driver.core.utils.UUIDs
import com.lightbend.lagom.scaladsl.api.ServiceCall
import com.lightbend.lagom.scaladsl.broker.TopicProducer
import com.lightbend.lagom.scaladsl.persistence.{EventStreamElement, PersistentEntityRegistry}
import org.wex.cmsfs.monitor.api
import org.wex.cmsfs.monitor.api._

import scala.concurrent.{ExecutionContext, Future}

class MonitorServiceImpl(registry: PersistentEntityRegistry)(implicit ec: ExecutionContext) extends MonitorService {
  override def createMonitor: ServiceCall[Monitor, Monitor] = ServiceCall { m =>
    val id = UUIDs.timeBased()
    val monitor = Monitor(Some(id), m.cron, m.mode, m.monitorId, m.connectorId, MonitorStatus.Created)
    val command = CreateMonitor(monitor)
    entityRef(id).ask(command).map(_ => monitor)
  }

  override def monitorCollectEvents = TopicProducer.taggedStreamWithOffset(MonitorEvent.Tag.allTags.toList) { (tag, offset) =>
    println(11)
    registry.eventStream(tag, offset).mapAsync(1)(p => Future{
      println(offset);
      (api.MonitorCreated(UUIDs.random(), 1, 1), offset)
    })
  }


    private def convertEvent(eventStreamElement: EventStreamElement[MonitorEvent]): Future[(api.MonitorEvent, Offset)] = {
      eventStreamElement match {
        case EventStreamElement(_, MonitorCreated(m), offset) =>
          Future((api.MonitorCreated(m.id.get, m.monitorId, m.connectorId), offset))
      }
    }

  private def entityRef(id: UUID) = entityRefString(id.toString)

  private def entityRefString(id: String) = registry.refFor[MonitorEntity](id)
} 

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

import java.sql.Connection

import com.lightbend.lagom.scaladsl.persistence.{EventStreamElement, ReadSideProcessor}
import com.lightbend.lagom.scaladsl.persistence.jdbc.{JdbcReadSide, JdbcSession}

import scala.concurrent.ExecutionContext

class MessageRepository(session: JdbcSession)(implicit ec: ExecutionContext) {

}

class MessageEventProcessor(readSide: JdbcReadSide)(implicit ec: ExecutionContext) extends ReadSideProcessor[MessageEvent] {

  import JdbcSession.tryWith

  override def aggregateTags = MessageEvent.Tag.allTags

  override def buildHandler() = {
    readSide.builder[MessageEvent]("messageEventOffset")
      .setGlobalPrepare(createTables)
      .setEventHandler[MessageCreated](processMessageChanged)
      .build()
  }

  private def createTables(connection: Connection): Unit = {
    tryWith(connection.prepareStatement("""
      CREATE TABLE IF NOT EXISTS messages (
        messageId varchar(36),
        message TEXT,
        PRIMARY KEY (messageId)
      )
    """))(_.execute())
  }

  private def processMessageChanged(connection: Connection, eventElement: EventStreamElement[MessageCreated]): Unit = {
    tryWith(connection.prepareStatement("INSERT INTO messages (messageId, message) VALUES (?, ?)")) { ps =>
      ps.setString(1, eventElement.event.message.id.toString)
      ps.setString(2, eventElement.event.message.message)
      ps.execute()
    }
  }

  /*
  private def createTables(connection: Connection): Unit = {
    tryWith(connection.prepareStatement("INSERT INTO messages (message) VALUES (?)")) { ps =>
      ps.execute()
    }
  }
  */
} 

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

import akka.Done
import com.lightbend.lagom.scaladsl.api.ServiceCall
import com.lightbend.lagom.scaladsl.api.broker.Topic
import com.lightbend.lagom.scaladsl.broker.TopicProducer
import com.lightbend.lagom.scaladsl.persistence.{EventStreamElement, PersistentEntityRegistry}
import com.orion.add.api
import com.orion.add.api.AddService


class AddServiceImpl(persistentEntityRegistry: PersistentEntityRegistry) extends AddService {
  override def add(): ServiceCall[api.AddNumber, String] = ServiceCall { request =>
    val ref = persistentEntityRegistry.refFor[NumberEntity]("constant")

    ref.ask(AddNumber(request.number))
  }

  override def curry(): ServiceCall[api.CurryWith, Done] = ServiceCall { request =>
    val ref = persistentEntityRegistry.refFor[NumberEntity]("constant")

    ref.ask(CurryWith(request.number))
  }

  override def additionTopic(): Topic[api.CurriedWith] =
    TopicProducer.singleStreamWithOffset {
      fromOffset =>
        persistentEntityRegistry.eventStream(NumberEvent.Tags, fromOffset)
        .map(ev => (convertEvent(ev), ev.offset))
    }

  private def convertEvent(numberEvent: EventStreamElement[NumberEvent]): api.CurriedWith = {
    numberEvent.event match {
      case CurriedWith(num) => api.CurriedWith(num)
    }
  }
} 

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

import com.example.hello.api
import com.example.hello.api.{HelloService}
import com.lightbend.lagom.scaladsl.api.ServiceCall
import com.lightbend.lagom.scaladsl.api.broker.Topic
import com.lightbend.lagom.scaladsl.broker.TopicProducer
import com.lightbend.lagom.scaladsl.persistence.{EventStreamElement, PersistentEntityRegistry}


class HelloServiceImpl(persistentEntityRegistry: PersistentEntityRegistry) extends HelloService {

  override def hello(id: String) = ServiceCall { _ =>
    // Look up the Hello entity for the given ID.
    val ref = persistentEntityRegistry.refFor[HelloEntity](id)

    // Ask the entity the Hello command.
    ref.ask(Hello(id))
  }

  override def useGreeting(id: String) = ServiceCall { request =>
    // Look up the Hello entity for the given ID.
    val ref = persistentEntityRegistry.refFor[HelloEntity](id)

    // Tell the entity to use the greeting message specified.
    ref.ask(UseGreetingMessage(request.message))
  }


  override def greetingsTopic(): Topic[api.GreetingMessageChanged] =
    TopicProducer.singleStreamWithOffset {
      fromOffset =>
        persistentEntityRegistry.eventStream(HelloEvent.Tag, fromOffset)
          .map(ev => (convertEvent(ev), ev.offset))
    }

  private def convertEvent(helloEvent: EventStreamElement[HelloEvent]): api.GreetingMessageChanged = {
    helloEvent.event match {
      case GreetingMessageChanged(msg) => api.GreetingMessageChanged(helloEvent.entityId, msg)
    }
  }
} 

//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 akka.Done
import com.datastax.driver.core.PreparedStatement
import com.lightbend.lagom.scaladsl.persistence.ReadSideProcessor.ReadSideHandler
import com.lightbend.lagom.scaladsl.persistence.cassandra.{CassandraReadSide, CassandraSession}
import com.lightbend.lagom.scaladsl.persistence.{AggregateEventTag, EventStreamElement, ReadSideProcessor}

import scala.concurrent.{ExecutionContext, Future}

class IdentityEventProcessor(session: CassandraSession, readSide: CassandraReadSide)(implicit ec: ExecutionContext) extends ReadSideProcessor[IdentityEvent] {
  private var insertUserStatement: PreparedStatement = _
  private var reportIdToReservedUsernamesStatement: PreparedStatement = _
  private var reportIdToReservedEmailsStatement: PreparedStatement = _

  override def buildHandler(): ReadSideHandler[IdentityEvent] = {
    readSide.builder[IdentityEvent]("identityEventOffset")
      .setPrepare { tag =>
        prepareStatements()
      }.setEventHandler[UserCreated](insertUser)
      .build()
  }

  override def aggregateTags: Set[AggregateEventTag[IdentityEvent]] = {
    IdentityEvent.Tag.allTags
  }

  private def prepareStatements(): Future[Done] = {
    for {
      insertUser <- session.prepare("INSERT INTO users(id, client_id, username, email, first_name, last_name, hashed_password) VALUES (?, ?, ?, ?, ?, ?, ?)")
      reportIdToReservedUsernames <- session.prepare("UPDATE reserved_usernames SET user_id = ? WHERE username = ?")
      reportIdToReservedEmails <- session.prepare("UPDATE reserved_emails SET user_id = ? WHERE email = ?")
    } yield {
      insertUserStatement = insertUser
      reportIdToReservedUsernamesStatement = reportIdToReservedUsernames
      reportIdToReservedEmailsStatement = reportIdToReservedEmails
      Done
    }
  }

  private def insertUser(user: EventStreamElement[UserCreated]) = {
    Future.successful(
      List(
        insertUserStatement.bind(
          user.event.userId,
          UUID.fromString(user.entityId),
          user.event.username,
          user.event.email,
          user.event.firstName,
          user.event.lastName,
          user.event.hashedPassword
        ),
        reportIdToReservedUsernamesStatement.bind(user.event.userId, user.event.username),
        reportIdToReservedEmailsStatement.bind(user.event.userId, user.event.email)
      )
    )
  }
} 

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

import akka.{Done, NotUsed}
import com.lightbend.lagom.scaladsl.api.ServiceCall
import com.lightbend.lagom.scaladsl.api.broker.Topic
import com.lightbend.lagom.scaladsl.broker.TopicProducer
import com.lightbend.lagom.scaladsl.persistence.{EventStreamElement, PersistentEntityRegistry}
import sample.helloworld.api.model.GreetingMessage
import sample.helloworld.api.HelloService


class HelloServiceImpl(persistentEntityRegistry: PersistentEntityRegistry) extends HelloService {

  override def hello(id: String): ServiceCall[NotUsed, _root_.sample.helloworld.impl.Hello#ReplyType] = ServiceCall { _ =>
    // Look up the Hello entity for the given ID.
    val ref = persistentEntityRegistry.refFor[HelloEntity](id)

    // Ask the entity the Hello command.
    ref.ask(Hello(id, None))
  }

  override def useGreeting(id: String): ServiceCall[GreetingMessage, Done] = ServiceCall { request =>
    // Look up the Hello entity for the given ID.
    val ref = persistentEntityRegistry.refFor[HelloEntity](id)

    // Tell the entity to use the greeting message specified.
    ref.ask(UseGreetingMessage(request.message))
  }

  override def greetingsTopic(): Topic[GreetingMessage] = {
    TopicProducer.singleStreamWithOffset {
      offset =>
        persistentEntityRegistry.eventStream(HelloEventTag.instance, offset)
          .map(ev => (convertEvent(ev), offset))
    }
  }

  private def convertEvent(helloEvent: EventStreamElement[HelloEvent]): GreetingMessage = {
    helloEvent.event match {
      case GreetingMessageChanged(msg) => GreetingMessage(msg)
    }
  }

} 

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

import com.lightbend.lagom.scaladsl.api.ServiceCall
import com.lightbend.lagom.scaladsl.api.broker.Topic
import com.lightbend.lagom.scaladsl.broker.TopicProducer
import com.lightbend.lagom.scaladsl.persistence.{EventStreamElement, PersistentEntityRegistry}
import com.onedrop.github
import com.onedrop.github.api.GithubService


class GithubServiceImpl(persistentEntityRegistry: PersistentEntityRegistry) extends GithubService {

  override def getOrg(org: String) = ServiceCall { _ =>
    // Look up the github entity for the given ID.
    val ref = persistentEntityRegistry.refFor[GithubEntity](id)

    // Ask the entity the Hello command.
    ref.ask(Hello(id))
  }

  override def getMembers(org: String) = ServiceCall { request =>
    // Look up the github entity for the given ID.
    val ref = persistentEntityRegistry.refFor[GithubEntity](id)

    // Tell the entity to use the greeting message specified.
    ref.ask(UseGreetingMessage(request.message))
  }


  override def getRepos(org: String): Topic[github.api.GreetingMessageChanged] =
    TopicProducer.singleStreamWithOffset {
      fromOffset =>
        persistentEntityRegistry.eventStream(GithubEvent.Tag, fromOffset)
          .map(ev => (convertEvent(ev), ev.offset))
    }

  private def convertEvent(helloEvent: EventStreamElement[GithubEvent]): github.api.GreetingMessageChanged = {
    helloEvent.event match {
      case GreetingMessageChanged(msg) => github.api.GreetingMessageChanged(helloEvent.entityId, msg)
    }
  }
} 

//设置package包名称以及导入依赖的类
package de.breitbandig.lagomhello.impl

import de.breitbandig.lagomhello.api
import de.breitbandig.lagomhello.api.{LagomhelloService}
import com.lightbend.lagom.scaladsl.api.ServiceCall
import com.lightbend.lagom.scaladsl.api.broker.Topic
import com.lightbend.lagom.scaladsl.broker.TopicProducer
import com.lightbend.lagom.scaladsl.persistence.{EventStreamElement, PersistentEntityRegistry}


class LagomhelloServiceImpl(persistentEntityRegistry: PersistentEntityRegistry) extends LagomhelloService {

  override def hello(id: String) = ServiceCall { _ =>
    // Look up the lagom-hello entity for the given ID.
    val ref = persistentEntityRegistry.refFor[LagomhelloEntity](id)

    // Ask the entity the Hello command.
    ref.ask(Hello(id))
  }

  override def useGreeting(id: String) = ServiceCall { request =>
    // Look up the lagom-hello entity for the given ID.
    val ref = persistentEntityRegistry.refFor[LagomhelloEntity](id)

    // Tell the entity to use the greeting message specified.
    ref.ask(UseGreetingMessage(request.message))
  }


  override def greetingsTopic(): Topic[api.GreetingMessageChanged] =
    TopicProducer.singleStreamWithOffset {
      fromOffset =>
        persistentEntityRegistry.eventStream(LagomhelloEvent.Tag, fromOffset)
          .map(ev => (convertEvent(ev), ev.offset))
    }

  private def convertEvent(helloEvent: EventStreamElement[LagomhelloEvent]): api.GreetingMessageChanged = {
    helloEvent.event match {
      case GreetingMessageChanged(msg) => api.GreetingMessageChanged(helloEvent.entityId, msg)
    }
  }
}