Transparent deserialization of a JsValue in pattern matching

works.scala

import spray.json._

object MyProtocol extends DefaultJsonProtocol {
  implicit object MyMessageFormat extends RootJsonFormat[MyMessage] {
    def write(msg: MyMessage) = JsObject("arg1" -> JsString(msg.arg1), "arg2" -> JsString(msg.arg2))
    def read(value: JsValue) = value.asJsObject.getFields("arg1", "arg2") match {
      case Seq(JsString(arg1), JsString(arg2)) => new MyMessage(arg1, arg2)
      case _ => deserializationError("MyMessage expected")
    }
  }
}

case class MyMessage(arg1: String, arg2: String)
object MyMessage {
  def unapply(any: Any): Option[(String, String)] = {
    if (any.isInstanceOf[MyMessage]) {
      val msg = any.asInstanceOf[MyMessage]
      Some((msg.arg1, msg.arg2))
    } else if (any.isInstanceOf[JsValue]) {
      any.asInstanceOf[JsValue].asJsObject.getFields("arg1", "arg2") match {
        case Seq(JsString(arg1), JsString(arg2)) =>
          Some(arg1, arg2)
        case _ => None
      }
    } else {
      None
    }
  }
}

object ProtocolMixing extends App {
  import MyProtocol._
  type Receive = PartialFunction[Any, Unit]
  def receive: Receive = {
    case MyMessage(arg1, arg2) =>
      println(s"arg1: $arg1, arg2: $arg2")
  }
  receive(MyMessage("one", "two"))
  receive(MyMessage("one", "two").toJson)
}