scala - Play Scala Akka WebSockets 更改 Actor 路径

Question

我遵循了使用 Scala Play 和 Akka Actor 创建 Web 套接字的示例:

https://www.playframework.com/documentation/2.5.x/ScalaWebSockets#Handling-WebSockets-with-Akka-Streams-and-actors

在恢复时， Controller :

import play.api.mvc._
import play.api.libs.streams._

class Controller1 @Inject() (implicit system: ActorSystem, materializer: Materializer) {

  def socket = WebSocket.accept[String, String] { request =>
    ActorFlow.actorRef(out => MyWebSocketActor.props(out))
  }

还有 Actor :

import akka.actor._

object MyWebSocketActor {
  def props(out: ActorRef) = Props(new MyWebSocketActor(out))
}

class MyWebSocketActor(out: ActorRef) extends Actor {
  def receive = {
    case msg: String =>
      out ! ("I received your message: " + msg)
  }
}

创建的 Actor (每个 websocket 连接一个)是/user Actor 的 child 。我创建了 3 个连接，创建的 Actor 是:

/user/$b

/user/$c

/user/$d

我想根据网络套接字消息的字段更改 Actor 的姓名。我怎么能这样做？

Answer 1

您可以按如下方式设置actor的名称:

创建文件 BetterActorFlow.scala

package your.package

import akka.actor._
import akka.stream.scaladsl.{Keep, Sink, Source, Flow}
import akka.stream.{Materializer, OverflowStrategy}

object BetterActorFlow {

  def actorRef[In, Out](props: ActorRef => Props, bufferSize: Int = 16, overflowStrategy: OverflowStrategy = OverflowStrategy.dropNew, maybeName: Option[String] = None)(implicit factory: ActorRefFactory, mat: Materializer): Flow[In, Out, _] = {

    val (outActor, publisher) = Source.actorRef[Out](bufferSize, overflowStrategy)
                        .toMat(Sink.asPublisher(false))(Keep.both).run()

    def flowActorProps: Props = {
      Props(new Actor {
        val flowActor = context.watch(context.actorOf(props(outActor), "flowActor"))

        def receive = {
          case Status.Success(_) | Status.Failure(_) => flowActor ! PoisonPill
          case Terminated(_) => context.stop(self)
          case other => flowActor ! other
        }

        override def supervisorStrategy = OneForOneStrategy() { case _ => SupervisorStrategy.Stop }
      })
    }

    def actorRefForSink =
      maybeName.fold(factory.actorOf(flowActorProps)) { name => factory.actorOf(flowActorProps, name) }

    Flow.fromSinkAndSource(Sink.actorRef(actorRefForSink, Status.Success(())), Source.fromPublisher(publisher))

  }
}

使用 BetterActorFlow 代替 ActorFlow:

BetterActorFlow.actorRef(out =>
  ChatActor.props(out), 16, OverflowStrategy.dropNew, Some("alicebob"))

这对我有用。创建的 Actor 在 user/alicebob (将此与 context.system.actorSelection("user/alicebob") 一起使用)