我有一个简单的scala类CartService,它创建一个actor并向它发送一些消息,并且actor通过发送者向服务发回响应!结果演员代码

package actors

import java.util.UUID

import akka.persistence.PersistentActor
import entites._




/**
  * Created by spineor on 12/12/16.
  */

//Command to be processed by the Actors
case class AddSkuToCartCmd(cart_id :UUID, sku_id :String, price :Double)
case class RemoveSkufromCmd(cart_id :UUID, sku_id :String)
case class ChangeSkuQuantityCmd(cart_id: UUID, sku_id: String, new_quantity: Int)
case class GetCartUniqueSkuCountCmd(cart_id: UUID)
case class CheckoutCartCmd(cart_id: UUID)

//Events to be persisted in Journal
case class AddedSkutoCartEvent(cart_id :UUID, sku_id:String, price :Double)
case class RemovedSkuFromCartEvent(cart_id :UUID, sku_id :String)
case class ChangeSkuQuantityEvent(cart_id: UUID, sku_id: String, new_quantity: Int)


class CartActor extends PersistentActor{
  import kafka.producerConsumer._
  var cart :Cart = _
  override def preStart() {
    val actorName = self.path.name
    println("hi2")
    var cart_entries = Map[String, CartEntry]()
    var cart_new = new Cart(UUID.fromString(actorName), cart_entries)
    cart = cart_new

  }

  override def receiveRecover: Receive = {

    case AddedSkutoCartEvent(cart_id , sku_id, price) =>
       addSkutoCart(cart_id,sku_id, price)

    case RemovedSkuFromCartEvent(cart_id , sku_id) =>
       removeSkufromCart(cart_id,sku_id)

    case ChangeSkuQuantityEvent(cart_id , sku_id, new_quantity) =>
       changeSkuQuantity(cart_id,sku_id, new_quantity)

    case CheckoutCartCmd(cart_id) =>

    case GetCartUniqueSkuCountCmd(cart_id) =>
      println("in recover")
  }

  override def receiveCommand: Receive = {

    case AddSkuToCartCmd(cart_id , sku_id, price) =>
      println("hi")
      persist(AddedSkutoCartEvent(cart_id , sku_id, price)) (evt =>{
          addSkutoCart(cart_id,sku_id, price)
        })


    case RemoveSkufromCmd(cart_id , sku_id) =>
      persist(RemovedSkuFromCartEvent(cart_id , sku_id)) (evt =>{
          removeSkufromCart(cart_id,sku_id)
        })



    case ChangeSkuQuantityCmd(cart_id, sku_id, new_quantity) =>
      persist(ChangeSkuQuantityEvent(cart_id, sku_id, new_quantity)) (evt =>{
        changeSkuQuantity(cart_id, sku_id, new_quantity)
      })

    case GetCartUniqueSkuCountCmd(cart_id) =>
       sender ! getCartUniqueSkuCount(cart_id)

    case CheckoutCartCmd(cart_id) =>
       checkoutCart(cart_id)
  }


  override def persistenceId: String = self.path.name


  def addSkutoCart(cart_id: UUID, sku_id: String, price: Double) : UUID= {
    var entries = cart.cart_entries
    val new_entry =  CartEntry(sku_id, 1, price)
    val new_entries = entries + (sku_id -> new_entry)
    cart.cart_entries = new_entries
    cart.cart_id
  }

  def changeSkuQuantity(cart_id: UUID ,sku_id: String ,new_quant: Int)= {
    var entries = cart.cart_entries
    if(entries.contains(sku_id)){
      //If sku is already present  increase quantity by 1 set price as latest received and update the entries map
      var cart_entry = entries.get(sku_id).get
      var new_quantity = new_quant
      var new_price = cart_entry.price
      val new_entry = CartEntry(sku_id, new_quantity, new_price)
      entries + (sku_id -> new_entry)
     }
    else{
      //TODO : Throw Exception , item to be updated is not present in cart
    }
    /*for ((k,v) <- entries) printf("key: %s, value: %s\n", k, v)*/
  }

  def removeSkufromCart(cart_id: UUID, sku_id: String) = {

    var entries = cart.cart_entries
    var new_entries = entries - sku_id
    cart.cart_entries = new_entries
   }

  def getCartUniqueSkuCount(cart_id: UUID): Int = {
    val count = cart.cart_entries.size
     count
  }

  def checkoutCart(cart_id: UUID) = {
    val cartProducer = Producer[Cart]("Cart-Update-Topic")
    cartProducer.send(cart)
    //Consumer Test Code
    /*val consumer = SingleTopicConsumer("Cart-Update-Topic")
    var entries = cart.cart_entries
    var cart3 = new Cart(cart.cart_id,entries)
    cartProducer.send(cart3)
    entries += "ABC" -> new CartEntry("ABC",12,213)
    val kafkaCart = consumer.read()*/
  }

}

和服务代码

package services

import java.util.UUID

import actors._
import akka.actor.{ActorRef, ActorSystem, Props}
import akka.pattern.ask
import akka.util.Timeout

import scala.concurrent.Await
import scala.concurrent.ExecutionContext.Implicits.global
import scala.concurrent.duration._
import scala.util.{Failure, Success}
import scala.concurrent.duration.Duration



/**
  * Created by spineor on 9/12/16.
  */
class CartService {

  var system = ActorSystem("System")

  def addSkutoCart(cart_id :UUID, sku_id :String, price :Double) :String = {

    //get Actor for this cart_id
    //implicit val timeout: Timeout = 20 seconds
    val cart_actor = routeMessagesToCart(cart_id)
    cart_actor ! AddSkuToCartCmd(cart_id, sku_id ,price)
    cart_actor.path.name
  }

  def removeSkuFromCart(cart_id :UUID, sku_id :String)  = {

    //get Actor for this cart_id
    val cart_actor = routeMessagesToCart(cart_id)
    cart_actor ! RemoveSkufromCmd(cart_id, sku_id )
  }

  def changeSkuQuantity(cart_id: UUID,sku_id: String ,new_quantity: Int) = {
    val cart_actor = routeMessagesToCart(cart_id)
    cart_actor ! ChangeSkuQuantityCmd(cart_id, sku_id, new_quantity)
  }

  def checkoutCart(cart_id: UUID) ={
    val cart_actor = routeMessagesToCart(cart_id)
    cart_actor ! CheckoutCartCmd(cart_id)
  }

  /*This is cental method to locate cart Actors in the node
  in case a actor is not present or has terminated ,it will be created
  In case of a terminated cart actor ,its previous events will be replayed
  from the journal first and then the new message is applied
  The Cart actor name and its persistence id both are same as the Cart's unique UUID*/

  def routeMessagesToCart(cart_id: UUID): ActorRef = {
    var cartActor :ActorRef = null

    if(null == cart_id){
      //No cart id in request create a new Cart Actor for the request
      val new_cart_id = createNewCartId()
      cartActor = system.actorOf(Props[CartActor],new_cart_id.toString)
      cartActor
    }
    //Find if actor for the cart already exists,or is Terminated
    else{
      implicit val timeout = Timeout(5 seconds)
      val name = "/user/" + cart_id.toString
      val future = system.actorSelection("/user/" + cart_id.toString).resolveOne()

      future onComplete {
        case Success(v) => { cartActor = v
        }
        case Failure(e) => {
          //The cart actor no longer exists and must be recreated
          cartActor = system.actorOf(Props[CartActor],cart_id.toString)
        }
      }
     //Sleep for Actor to be created
     Thread.sleep(500)
     cartActor
    }

  }

  /*
  This method creates a new random UUID which is used to uniquely
  identify the cart and thus cart actors
  */

  def createNewCartId() :UUID = {
    val cart_id = UUID.randomUUID()
     cart_id
  }

  def getCartUniqueSkuCount(cart_id: UUID) ={

    val cart_actor = routeMessagesToCart(cart_id)

    implicit val timeout = Timeout(15 seconds)
    val count = cart_actor ? GetCartUniqueSkuCountCmd(cart_id)
    val result = Await.result(count, 15 second)
    result
    /*count onComplete {
      case Success(x) =>  println("Unique Items in cart : " + x)
      case Failure(t) => println("An error has occured: " + t.getMessage)
    }*/


  }



}

现在我正在为我创建服务对象的服务编写测试用例,并调用将消息发送给actor的服务方法

val service = new CartService()
val new_cart_id = UUID.fromString(service.addSkutoCart(null, "12", 12))

val count = service.getCartUniqueSkuCount(new_cart_id)

但是这次等待时间过去了,我收到了一条消息

[INFO] [12/28/2016 16:07:10.441] [System-akka.actor.default-dispatcher-7] [akka:// System / user / fd38f1b1-6f03-4997-8625-0ce7e0ef2626]消息[从Actor [akka:// System / temp / $ a]到Actor [akka:// System / user / fd38f1b1-6f03-4997-8625-0ce7e0ef2626#279696660]的actors.GetCartUniqueSkuCountCmd]未送达 . [2]遇到死信 . 可以使用配置设置'akka.log-dead-letters'和'akka.log-dead-letters-during-shutdown'关闭或调整此日志记录 .

从一些谷歌搜索我知道它与发件人被关闭有关,但我无法解决这个问题 . 任何输入都表示赞赏 .

这是堆栈跟踪:

java.util.concurrent.TimeoutException:期货在[15秒]后scala.concurrent.impl.Promise $ DefaultPromise.ready(Promise.scala:219)在scala.concurrent.impl.Promise $ DefaultPromise.result(Promise)后超时.scala:223)scala.concurrent.Await $$ anonfun $ result $ 1.apply(package.scala:190)scala.concurrent.BlockContext $ DefaultBlockContext $ .blockOn(BlockContext.scala:53)at scala.concurrent.Await $ .result(package.scala:190)atService.CartService.getCartUniqueSkuCount(CartService.scala:103)at CartActorSpec $$ anonfun $ 1 $$ anonfun $ apply $ mcV $ sp $ 1.apply $ mcV $ sp(CartActorSpec.scala: 48)在CartActorSpec $$ anonfun $ 1 $$ anonfun $在CartActorSpec申请$ mcV $ sp $ 1.apply(CartActorSpec.scala:44)$$ anonfun $ 1 $$ anonfun $ apply $ mcV $ sp $ 1.apply(CartActorSpec.scala: 44)在org.scalatest.Transformer $$ anonfun $在org.scalatest.OutcomeOf的org.scalatest.OutcomeOf $ class.outcomeOf(OutcomeOf.scala:85)申请$ 1.apply $ mcV $ sp(Transformer.scala:22) $ .outcomeOf(OutcomeOf.scala:104)at org.scalatest.Transformer.apply(Transfor mer.scala:22)org.scalatest.Transformer.apply(Transformer.scala:20)atg.scalatest.WordSpecLike $$ anon $ 1.apply(WordSpecLike.scala:953)at org.scalatest.Suite $ class.withFixture (Suite.scala:1122)CartActorSpec.withFixture(CartActorSpec.scala:19)at org.scalatest.WordSpecLike $ class.invokeWithFixture $ 1(WordSpecLike.scala:950)at org.scalatest.WordSpecLike $$ anonfun $ runTest $ 1.apply (WordSpecLike.scala:962)org.scalatest.WordSpecLike $$ oron.scalatest.WordSpecLike $ org.scalatest.SuperEngine.runTestImpl(Engine.scala:306)atg.scalatest.WordSpecLike $ anonfun $ runTest $ 1.apply(WordSpecLike.scala:962) class.runTest(WordSpecLike.scala:962)at CartActorSpec.runTest(CartActorSpec.scala:19)org.scalatest.WordSpecLike $$ anonfun $ runTests $ 1.apply(WordSpecLike.scala:1021)at org.scalatest.WordSpecLike $$ anonfun $ runTests $ 1.apply(WordSpecLike.scala:1021)org.scalatest.SuperEngine $$ anonfun $ traverseSubNodes $ 1 $ 1.apply(Engine.scala:413)at org.scalatest.SuperEngine $$ anonfun $ traverseSubNodes $ 1 $ 1.apply (Engine.scala:401)在scal a.collection.immutable.List.foreach(List.scala:381)位于org.scalatest.SuperEngine.traverseSubNodes $ 1(Engine.scala:401)org.scalatest.SuperEngine.org $ scalatest $ SuperEngine $$ runTestsInBranch(Engine . scala:390)at org.scalatest.SuperEngine $$ anonfun $ traverseSubNodes $ 1 $ 1.apply(Engine.scala:427)at org.scalatest.SuperEngine $$ anonfun $ traverseSubNodes $ 1 $ 1.apply(Engine.scala:401)at scala .collection.immutable.List.foreach(List.scala:381)org.scalatest.SuperEngine.traverseSubNodes $ 1(Engine.scala:401)org.scalatest.SuperEngine.org $ scalatest $ SuperEngine $$ runTestsInBranch(Engine.scala) :396)org.scalatest.SuperEngine.runTestsImpl(Engine.scala:483)atg.scalatest.WordSpecLike $ class.runTests(WordSpecLike.scala:1021)at CartActorSpec.runTests(CartActorSpec.scala:19)at org.scalatest .Suite $ class.run(Suite.scala:1424)at CartActorSpec.org $ scalatest $ WordSpecLike $$ super $ run(CartActorSpec.scala:19)at org.scalatest.WordSpecLike $$ anonfun $ run $ 1.apply(WordSpecLike . scala:1067)在org.scalatest.WordSp ecLike $$ anonfun $运行$ 1.apply(WordSpecLike.scala:1067)org.scalatest.SuperEngine.runImpl(Engine.scala:545)org.scalatest.WordSpecLike $ class.run(WordSpecLike.scala:1067)at CartActorSpec .org $ scalatest $ BeforeAndAfterAll $$ super $ run(CartActorSpec.scala:19)at org.scalatest.BeforeAndAfterAll $ class.liftedTree1 $ 1(BeforeAndAfterAll.scala:257)at org.scalatest.BeforeAndAfterAll $ class.run(BeforeAndAfterAll.scala :256)在CartActorSpec.run(CartActorSpec.scala:19)

PS我的测试课中确实有ImplictSender特性

class CartActorSpec extends TestKit(ActorSystem("CartActorSpec"))
  with WordSpecLike
  with Matchers
  with BeforeAndAfterAll
  with ImplicitSender  {...}