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我遇到了一个演员延伸Stash的问题，当在简单的ActorSystem中使用actorOf实例化它时，它工作得很好。现在我真的想在我的程序中使用它们之前为我的存储演员编写一些测试。但是我无法想出一个在我的测试套件中使用TestActorRef和这个actor的方法。测试Akka演员mixin藏着TestActorRef
，工程的代码看起来是这样的：
import akka.actor.{Stash, Actor, ActorSystem, Props}
import com.typesafe.config.ConfigFactory
object StashTest {
val config = ConfigFactory.parseString(
"""
|akka.actor.default-mailbox {
| mailbox-type = "akka.dispatch.UnboundedDequeBasedMailbox"
|}
""".stripMargin)
}
class StashTestActor extends Stash {
def receive: Actor.Receive = {
case "unstash" =>
unstashAll()
context become print
case msg => stash()
}
def print: Actor.Receive = {
case msg => println(s"Unstashed message: $msg")
}
}
val system = ActorSystem("stashSystem", StashTest.config)
val ref = system.actorOf(Props[StashTestActor])
ref ! "stash me"
ref ! "blah"
ref ! "unstash"
它打印
Unstashed message: stash me
Unstashed message: blah
但是，如果我尝试写一个WordSpec测试这个演员，这给我留下了一些讨厌的例外，我可以弄清楚他们希望我在代码中改变什么。
测试类看起来像这样
import akka.testkit.{TestActorRef, TestKit}
import akka.actor.{Stash, Actor, ActorSystem}
import org.scalatest.{WordSpecLike, MustMatchers}
import com.typesafe.config.ConfigFactory
class StashTestActor extends Stash {
def receive: Actor.Receive = {
case "unstash" =>
unstashAll()
context become print
case msg => stash()
}
def print: Actor.Receive = {
case msg => println(s"Unstashed message: $msg")
}
}
class StashTest extends TestKit(ActorSystem("testSystem", StashTest.config))
with WordSpecLike
with MustMatchers {
"A simple stashing actor" must {
val actorRef = TestActorRef[StashTestActor]
"stash messages" in {
actorRef ! "stash me!"
}
"unstash all messages" in {
actorRef ! "unstash"
}
}
}
object StashTest {
val config = ConfigFactory.parseString(
"""
|akka.actor.default-mailbox {
| mailbox-type = "akka.dispatch.UnboundedDequeBasedMailbox"
|}
""".stripMargin)
}
运行测试时，我获得以下属于TestActorRef的实例化时抛出的异常。
[ERROR] [08/20/2013 14:19:40.765] [testSystem-akka.actor.default-dispatcher-3] [akka://testSystem/user/$$a] Could not instantiate Actor
Make sure Actor is NOT defined inside a class/trait,
if so put it outside the class/trait, f.e. in a companion object,
OR try to change: 'actorOf(Props[MyActor]' to 'actorOf(Props(new MyActor)'.
akka.actor.ActorInitializationException: exception during creation
at akka.actor.ActorInitializationException$.apply(Actor.scala:218)
at akka.actor.ActorCell.create(ActorCell.scala:578)
at akka.actor.ActorCell.invokeAll$1(ActorCell.scala:425)
at akka.actor.ActorCell.systemInvoke(ActorCell.scala:447)
at akka.dispatch.Mailbox.processAllSystemMessages(Mailbox.scala:262)
at akka.testkit.CallingThreadDispatcher.process$1(CallingThreadDispatcher.scala:244)
at akka.testkit.CallingThreadDispatcher.runQueue(CallingThreadDispatcher.scala:284)
at akka.testkit.CallingThreadDispatcher.register(CallingThreadDispatcher.scala:153)
at akka.dispatch.MessageDispatcher.attach(AbstractDispatcher.scala:133)
at akka.actor.dungeon.Dispatch$class.start(Dispatch.scala:84)
at akka.actor.ActorCell.start(ActorCell.scala:338)
at akka.testkit.TestActorRef.<init>(TestActorRef.scala:50)
at akka.testkit.TestActorRef$.apply(TestActorRef.scala:141)
at akka.testkit.TestActorRef$.apply(TestActorRef.scala:137)
at akka.testkit.TestActorRef$.apply(TestActorRef.scala:146)
at akka.testkit.TestActorRef$.apply(TestActorRef.scala:144)
at stashActorTest.StashTest$$anonfun$1.apply$mcV$sp(StashTestActor.scala:29)
at stashActorTest.StashTest$$anonfun$1.apply(StashTestActor.scala:28)
at stashActorTest.StashTest$$anonfun$1.apply(StashTestActor.scala:28)
at org.scalatest.SuperEngine.registerNestedBranch(Engine.scala:613)
at org.scalatest.WordSpecLike$class.org$scalatest$WordSpecLike$$registerBranch(WordSpecLike.scala:120)
at org.scalatest.WordSpecLike$$anon$2.apply(WordSpecLike.scala:851)
at org.scalatest.words.MustVerb$StringMustWrapperForVerb$class.must(MustVerb.scala:189)
at org.scalatest.matchers.MustMatchers$StringMustWrapper.must(MustMatchers.scala:6167)
at stashActorTest.StashTest.<init>(StashTestActor.scala:28)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at java.lang.Class.newInstance(Class.java:374)
at org.scalatest.tools.Framework$ScalaTestTask.execute(Framework.scala:444)
at sbt.TestRunner.runTest$1(TestFramework.scala:84)
at sbt.TestRunner.run(TestFramework.scala:94)
at sbt.TestFramework$$anon$2$$anonfun$$init$$1$$anonfun$apply$8.apply(TestFramework.scala:224)
at sbt.TestFramework$$anon$2$$anonfun$$init$$1$$anonfun$apply$8.apply(TestFramework.scala:224)
at sbt.TestFramework$.sbt$TestFramework$$withContextLoader(TestFramework.scala:212)
at sbt.TestFramework$$anon$2$$anonfun$$init$$1.apply(TestFramework.scala:224)
at sbt.TestFramework$$anon$2$$anonfun$$init$$1.apply(TestFramework.scala:224)
at sbt.TestFunction.apply(TestFramework.scala:229)
at sbt.Tests$$anonfun$7.apply(Tests.scala:196)
at sbt.Tests$$anonfun$7.apply(Tests.scala:196)
at sbt.std.Transform$$anon$3$$anonfun$apply$2.apply(System.scala:45)
at sbt.std.Transform$$anon$3$$anonfun$apply$2.apply(System.scala:45)
at sbt.std.Transform$$anon$4.work(System.scala:64)
at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:237)
at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:237)
at sbt.ErrorHandling$.wideConvert(ErrorHandling.scala:18)
at sbt.Execute.work(Execute.scala:244)
at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:237)
at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:237)
at sbt.ConcurrentRestrictions$$anon$4$$anonfun$1.apply(ConcurrentRestrictions.scala:160)
at sbt.CompletionService$$anon$2.call(CompletionService.scala:30)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:724)
Caused by: akka.actor.ActorInitializationException: Could not instantiate Actor
Make sure Actor is NOT defined inside a class/trait,
if so put it outside the class/trait, f.e. in a companion object,
OR try to change: 'actorOf(Props[MyActor]' to 'actorOf(Props(new MyActor)'.
at akka.actor.ActorInitializationException$.apply(Actor.scala:218)
at akka.testkit.TestActorRef$$anonfun$apply$2$$anonfun$apply$1.applyOrElse(TestActorRef.scala:148)
at akka.testkit.TestActorRef$$anonfun$apply$2$$anonfun$apply$1.applyOrElse(TestActorRef.scala:147)
at scala.runtime.AbstractPartialFunction.apply(AbstractPartialFunction.scala:33)
at scala.util.Failure$$anonfun$recover$1.apply(Try.scala:185)
at scala.util.Try$.apply(Try.scala:161)
at scala.util.Failure.recover(Try.scala:185)
at akka.testkit.TestActorRef$$anonfun$apply$2.apply(TestActorRef.scala:147)
at akka.testkit.TestActorRef$$anonfun$apply$2.apply(TestActorRef.scala:153)
at akka.actor.CreatorFunctionConsumer.produce(Props.scala:369)
at akka.actor.Props.newActor(Props.scala:323)
at akka.actor.ActorCell.newActor(ActorCell.scala:534)
at akka.actor.ActorCell.create(ActorCell.scala:560)
... 58 more
Caused by: java.lang.NullPointerException
at akka.actor.UnrestrictedStash$class.$init$(Stash.scala:82)
at stashActorTest.StashTestActor.<init>(StashTestActor.scala:9)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at akka.actor.ReflectiveDynamicAccess$$anonfun$createInstanceFor$2.apply(DynamicAccess.scala:78)
at scala.util.Try$.apply(Try.scala:161)
at akka.actor.ReflectiveDynamicAccess.createInstanceFor(DynamicAccess.scala:73)
... 64 more
我对使用TestActorRefs和不扩展Stash的actor有任何问题。所以我不知道这是一个配置错误还是我错过的其他东西。
会更好的解决方案不是有一个允许使用某种形式的无限邮箱的仅测试包装器？ – fommil