Play + Akka-加入集群並在另一個ActorSystem上詢問actor

Question

我能夠使Play應用加入現有的Akka集群，然后對在另一個ActorSystem上運行的actor進行詢問，並返回結果。 但是我在幾件事上遇到麻煩-

1. 當游戲嘗試加入集群時，我在日志中看到以下內容。 我懷疑Play正在啟動自己的Akka集群嗎？ 我真的不確定這意味着什么。

   無法注冊name=akka:type=Cluster集群JMX MBean，因為它已被注冊。 如果您在同一個JVM中運行多個集群，請在配置中設置“ akka.cluster.jmx.multi-mbeans-in-same-jvm = on”

2. 現在，每次我收到不正確的方法請求到Controller時，我都會重新初始化actor系統。 我是Scala，Akka和Play的新手，很難弄清楚如何使其成為Singleton服務並注入我的控制器。

到目前為止，我已經知道了-

class DataRouter @Inject()(controller: DataController) extends SimpleRouter {
  val prefix = "/v1/data"

  override def routes: Routes = {
    case GET(p"/ip/$datatype") =>
      controller.get(datatype)

    case POST(p"/ip/$datatype") =>
      controller.process

  }

} 

---

case class RangeInput(start: String, end: String)
object RangeInput {

  implicit val implicitWrites = new Writes[RangeInput] {
    def writes(range: RangeInput): JsValue = {
      Json.obj(
        "start" -> range.start,
        "end" -> range.end

      )
    }
  }
}

@Singleton
class DataController @Inject()(cc: ControllerComponents)(implicit exec: ExecutionContext) extends AbstractController(cc) {

  private val logger = Logger("play")
  implicit val timeout: Timeout = 115.seconds
  private val form: Form[RangeInput] = {
    import play.api.data.Forms._

    Form(
      mapping(
        "start" -> nonEmptyText,
        "end" -> text
      )(RangeInput.apply)(RangeInput.unapply)
    )
  }


  def get(datatype: String): Action[AnyContent] = Action.async { implicit request =>
    logger.info(s"show: datatype = $datatype")
    logger.trace(s"show: datatype = $datatype")
    //val r: Future[Result] = Future.successful(Ok("hello " + datatype ))
    val config = ConfigFactory.parseString("akka.cluster.roles = [gateway]").
      withFallback(ConfigFactory.load())
    implicit val system: ActorSystem = ActorSystem(SharedConstants.Actor_System_Name, config)
    implicit val materializer: ActorMaterializer = ActorMaterializer()
    implicit val executionContext = system.dispatcher

    val ipData = system.actorOf(
      ClusterRouterGroup(RandomGroup(Nil), ClusterRouterGroupSettings(
        totalInstances = 100, routeesPaths = List("/user/getipdata"),
        allowLocalRoutees = false, useRoles = Set("static"))).props())

    val res: Future[String] = (ipData ? datatype).mapTo[String]
    //val res: Future[List[Map[String, String]]] = (ipData ? datatype).mapTo[List[Map[String,String]]]
    val futureResult: Future[Result] = res.map { list =>
      Ok(Json.toJson(list))
    }
    futureResult
  }

  def process: Action[AnyContent] = Action.async { implicit request =>
    logger.trace("process: ")
    processJsonPost()
  }

  private def processJsonPost[A]()(implicit request: Request[A]): Future[Result] = {
    logger.debug(request.toString())
    def failure(badForm: Form[RangeInput]) = {
      Future.successful(BadRequest("Test"))
    }

    def success(input: RangeInput) = {
      val r: Future[Result] = Future.successful(Ok("hello " + Json.toJson(input)))
      r
    }

    form.bindFromRequest().fold(failure, success)
  }

}

---

akka {
  log-dead-letters = off
  log-dead-letters-during-shutdown = off
  actor {
    provider = "akka.cluster.ClusterActorRefProvider"
  }
  remote {
    log-remote-lifecycle-events = off
    enabled-transports = ["akka.remote.netty.tcp"]
    netty.tcp {
      hostname = ${myhost}
      port = 0
    }
  }
  cluster {
    seed-nodes = [
      "akka.tcp://MyCluster@localhost:2541"
    ]

} seed-nodes = ${?SEEDNODE}
}

Answer 1

答案

1. 引用此URL。 https://www.playframework.com/documentation/2.6.x/ScalaAkka#Built-in-actor-system-name包含有關配置actor系統名稱的詳細信息。

2. 您不應在每個請求上初始化actor系統，而應在Application類中使用Play注入的actor系統，如果要自定義Actor系統，則應通過修改AKKA配置來實現。 為此，您應該創建自己的ApplicationLoader擴展GuiceApplicationLoader並重寫builder方法以具有自己的AKKA配置。 Play照顧的其他事情，例如在您的Application中注入這個actor系統。

請參閱下面的URL

https://www.playframework.com/documentation/2.6.x/ScalaDependencyInjection#Advanced:-Extending-the-GuiceApplicationLoader