自定义ApplicationLoader如何启动依赖项注入执行元并进行测试？

Question

在“依赖注入Actors”中，展示了如何将参数注入子Actors的构造函数中。父执行元使用injectedChild只允许将未注入的参数传递给子执行元（在子执行元创建时），然后让Guice注入其馀的参数。为此，它扩展了InjectedActorSupport并将子工厂注入构造函数：

class MyParent @Inject() (childFactory: MyChild.Factory,
                           @Assisted something: Something,
                           @Assisted somethingElse: SomethingElse) extends Actor with InjectedActorSupport
[..]
    val child: ActorRef = injectedChild(childFactory(something, somethingElse), childName)

但是启动父级并且不是执行元而是自定义ApplicationLoader的类怎么办？如何从那里启动父级演员？文件中没有提到这一点。

class MyLoader @Inject() (parentFactory: MyParent.Factory) extends ApplicationLoader with Actor with InjectedActorSupport {
[..]
val parent = injectedChild(parentFactory(something, somethingElse), parentName)

class MyModule extends AbstractModule with AkkaGuiceSupport {
  def configure = {
    bindActor[MyParent](parentName)
    bindActor[MyLoader](loaderName)
    bindActorFactory[MyChild, MyChild.Factory]
    bindActorFactory[MyParent, MyParent.Factory]
  }
}

类MyLoaderSpec(_System:ActorSystem,隐式val ec：ExecutionContext）使用WordSpecLike扩展TestKit(_System),并使用Matchers{val loader=new SimstimLoader（？？？）

重写def beforeAll（）：Unit={Loader.Load（ApplicationLoader.CreateContext（new Environment（new File（“.”）,ApplicationLoader.GetClass.GetClassLoader,Mode.Test）））}

提前一百万谢谢你！

Answer 1

下面是我如何解决这个问题的。

-->如何启动需要依赖注入的父执行元。首先，如果您像我一样需要依赖注入一个不知道如何传递和从哪里传递的实例，那么手动启动这样的actor是不可能的。解决方案是让Guice自动启动执行元。这是怎么做的。首先，为Guice创建绑定模块：

class MyModule extends AbstractModule with AkkaGuiceSupport{

  override def configure(): Unit = {
    bindActor[Root](Root.NAME)
    bind(classOf[StartupActors]).asEagerSingleton()
  }
}

然后，通过在conf/application.conf中添加以下内容，告诉Play绑定器模块的位置：

play.modules={
  enabled += "my.path.to.MyModule"
}

class StartupActors @Inject() (@Named(Root.NAME) root: ActorRef) {
  play.api.Logger.info(s"Initialised $root")
}

object Root {
  final val NAME = "THERoot"
  case class ParseConfiguration()
}

class Root @Inject()(configuration: Configuration, projectDAO: ProjectDAO) extends Actor {
  val resultingVar: Something = myConfigParsing()

  override def preStart(): Unit = {
    context.actorOf(Props(new MyParent(resultingVar: Something, somethingElse: SomethingElse, projectDAO: ProjectDAO)))
  }

  override def receive: Receive = {
    case ParseConfiguration => sender ! myConfigParsing()
    case _ => logger.error("Root actor received an unsupported message")
  }
}

class MyParent(something: Something, somethingElse: SomethingElse, projectDAO: ProjectDAO) extends Actor { ... }

import akka.actor.{ActorRef, ActorSystem, Props}
import akka.testkit.{TestKit, TestProbe}
import com.typesafe.config.ConfigFactory
import org.mockito.Mockito.mock
import org.scalatest.{BeforeAndAfterAll, WordSpecLike}
import org.specs2.matcher.MustMatchers
import play.api.Configuration
import scala.concurrent.ExecutionContext

class RootSpec(_system: ActorSystem) extends TestKit(_system)
  with WordSpecLike with BeforeAndAfterAll with MustMatchers {

  implicit val ec: ExecutionContext = scala.concurrent.ExecutionContext.global
  val conf: com.typesafe.config.Config = ConfigFactory.load()
  val configuration: Configuration = Configuration(conf)
  val projectDAOMock: ProjectDAO = mock(classOf[ProjectDAO])

  private var mainActor: ActorRef = _
  private var something: Something = Something.empty

  def this() = this(ActorSystem("MySpec"))

  override def afterAll: Unit = {
    system.shutdown()
  }

  override def beforeAll(): Unit = {
    mainActor = system.actorOf(Props(new Root(configuration, projectDAOMock)), Root.NAME)
  }

  "RootSpec: Root Actor" should {
    val probe = TestProbe()

    "successfully parse the configuration file" in {
      probe.send(mainActor, ParseConfiguration)
      something = probe.expectMsgPF() {
        case msg => msg.asInstanceOf[Something]
      }
    }
  }
}

然后通过方便地提供mock对象来代替配置解析产生的var来测试MyParent：

import akka.actor.{ActorRef, ActorSystem, Props}
import akka.testkit.{TestKit, TestProbe}
import org.mockito.Mockito
import org.mockito.Mockito._
import org.scalatest.{BeforeAndAfterAll, WordSpecLike}
import org.specs2.matcher.MustMatchers
import scala.concurrent.ExecutionContext.Implicits.global
import scala.concurrent.{ExecutionContext, Future}

case class AnyProjectAPI(val projectAPI: ProjectAPI) extends AnyVal
class MyParentSpec(_system: ActorSystem, implicit val ec: ExecutionContext) extends TestKit(_system)
  with WordSpecLike with BeforeAndAfterAll with MustMatchers {
  val something = mock(classOf[Something])
  val somethingElse = mock(classOf[somethingElse])
  val projectDAOMock: ProjectDAO = mock(classOf[ProjectDAO])

  val projectTest: ProjectAPI = new ProjectAPI(allMyRandomConstructorArguments),
  val projectsList: List[ProjectAPI] = List(projectTest)
  val expectedCreationId = 1
  private var parent: ActorRef = _

  def this() = this(ActorSystem("MySpec"), scala.concurrent.ExecutionContext.global)

  override def afterAll: Unit = {
    system.shutdown()
  }

  override def beforeAll(): Unit = {
    parent = system.actorOf(Props(new MyParent(something, somethingElse, projectDAOMock)), MyParent.NAME)
  }

  "MyParentTesting: parent's pull request" should {
    when(myProjApi.getAllProjects).thenReturn(Future {projectsList})
    val anyProject: AnyProjectAPI = AnyProjectAPI(org.mockito.Matchers.any[ProjectAPI])
    Mockito.when(projectDAOMock.create(org.mockito.Matchers.any[ProjectAPI]))
      .thenReturn(Future {expectedCreationId}: Future[Int])
    val probe = TestProbe()
    val probe1 = TestProbe()

    "be successfully satisfied by all children when multiple senders are waiting for an answer" in {
      probe.send(parent, UpdateProjects)
      probe1.send(parent, UpdateProjects)
      allChildren.foreach(child =>
        probe.expectMsg(expectedCreationId))
      allChildren.foreach(child =>
        probe1.expectMsg(expectedCreationId))
    }
  }
}