spray-can simple-http-server 示例如何处理绑定消息？

Question

在 spray-can HTTP 服务器示例中，当我运行服务器时，我没有在日志中看到任何 "Bound" 消息：

https://github.com/spray/spray/tree/master/examples/spray-can/simple-http-server/src/main

但是，如果我尝试创建自己的服务器并忽略 Bound 消息，我会让他们进入死信：

$ sbt run
[info] Set current project to pingpong (in build file:/D:/Projects/pingpong/)
[info] Updating {file:/D:/Projects/pingpong/}pingpong...
[info] Resolving jline#jline;2.12.1 ...
[info] Done updating.
[info] Running drozdyuk.pingpong.Main
[INFO] [08/03/2015 20:05:47.246] [default-akka.actor.default-dispatcher-2] [akka
://default/user/IO-HTTP/listener-0] Bound to localhost/127.0.0.1:8081
[INFO] [08/03/2015 20:05:47.246] [default-akka.actor.default-dispatcher-2] [akka
://default/deadLetters] Message [akka.io.Tcp$Bound] from Actor[akka://default/us
er/IO-HTTP/listener-0#-892116855] to Actor[akka://default/deadLetters] was not d
elivered. [1] dead letters encountered. This logging can be turned off or adjust
ed with configuration settings 'akka.log-dead-letters' and 'akka.log-dead-letter
s-during-shutdown'.

我的问题主要是出于好奇，示例中如何处理 Bound 消息？是某种日志吞噬了它们还是其他什么？

我的代码 Main.scala:

package drozdyuk.pingpong

import akka.actor.{ActorSystem, Props}
import akka.io.IO
import spray.can.Http

object Main extends App {
  implicit val system = ActorSystem()

  // the handler actor replies to incoming HttpRequests
  val handler = system.actorOf(Props[WebService], name = "handler")

  val PORT = 8081
  val DOMAIN = "localhost"
  IO(Http) ! Http.Bind(handler, interface = DOMAIN, port = PORT)
}

和我的 WebService.scala:

package drozdyuk.pingpong

import akka.actor._
import spray.http.HttpMethods.{GET}
import spray.can.Http
import spray.http.{HttpRequest, HttpResponse, Uri}

class WebService extends Actor with ActorLogging {
    def receive = {
      // New connection - register self as handler
      case _: Http.Connected => sender ! Http.Register(self)

      case HttpRequest(GET, Uri.Path("/ping"), _, _, _) =>
        sender ! HttpResponse(entity = "pong")

      case HttpRequest(GET, Uri.Path("/pong"), _, _, _) =>
        sender ! HttpResponse(entity = "ping")


      case _: HttpRequest => sender ! HttpResponse(status = 404, entity = "Unknown resource!")


    }
}

Answer 1

您可以在 Main 中使用另一个版本的 tell:

IO(Http).tell(Http.Bind(handler, interface = DOMAIN, port = PORT), sender = handler)

然后在您的 WebService 中处理 Bound 消息：

class WebService extends Actor with ActorLogging {
    def receive = {
        case Http.Bound(address) =>
        //all other cases...
    }
}

在您的情况下，您使用的是

def !(message: Any)(implicit sender: ActorRef = Actor.noSender): Unit

并且 Main 范围内没有隐式发件人，因此将使用默认值 noSender。

Answer 2

我试过了，对我来说效果很好：

import akka.actor._
import akka.io._
import spray.can.Http
import spray.http.HttpResponse
import spray.http.HttpRequest
import spray.http.Uri
import spray.http.HttpMethods.{GET}

class WebService extends Actor with ActorLogging {
    def receive = {
        case _: Http.Connected => sender ! Http.Register(self)

        case _: HttpRequest => sender ! HttpResponse(status = 404, entity =     "Unknown resource!")

        case HttpRequest(GET, Uri.Path("/ping"), _, _, _) =>
                    sender ! HttpResponse(entity = "pong")

        //all other cases...
    }
}

object TestSpray extends App {
    implicit val system = ActorSystem()
    val myListener: ActorRef = system.actorOf(Props[WebService], name = "handler")
    IO(Http) ! Http.Bind(myListener, interface = "localhost", port = 8080)
}

spray-can simple-http-server 示例 如何处理绑定消息？

spray-can simple-http-server example how are Bound messages handled?

scala

akka

spray

spray-can simple-http-server 示例如何处理绑定消息？