Getting an ActorRef when a WebSocket is closed in Play - scala

Question

According to the Play framework documentation, we have the option of overriding the postStop method, but it has no ActorRef. I need an ActorRef because I am using ActorRef as an identifier in a HashMap containing the mappings of actors to connected clients: on disconnect, I want to remove that mapping from the HashMap.
Edit:-
Here HashMap works as an authentication pool.The very first message from client is for Authentication, and on validation the instance of ActorRef is added to HashMap. On the following events/messages authorization is verified by checking the existence of ActorRef in HashMap, have a look at the following code:-
def authenticate(actorRef: ActorRef, message: SocketParsedMessage) {
(message.data \ "token").validate[String] match {
case s: JsSuccess[String] => {
val token = jwt.parse(s.get)
if (jwt.verify(token,jwtSecret)) {
val userId = UUID.fromString(jwt.getSubject(token))
hashMapU2A += (UUID.fromString(jwt.getSubject(token)) -> actorRef)
hashMapA2U += (actorRef -> userId)
actorRef ! SocketParsedMessage(AllowedSocketMessageTypes.AUTHENTICATE, Json.obj(
"success" -> true, "message" -> "Authorized for making further requests request")).toString
publishUserStatus(userId)
} else {
actorRef ! SocketParsedMessage(AllowedSocketMessageTypes.AUTHENTICATE, JsObject(
Seq("success" -> JsBoolean(false), "message" -> JsString("Invalid token"))
)).toString
}
}
case e: JsError => {
actorRef ! SocketParsedMessage(AllowedSocketMessageTypes.AUTHENTICATE, Json.obj(
"success" -> false, "message" -> "Token not supplied with request")).toString
actorRef ! PoisonPill
}
}
}
val hashMapA2U: mutable.HashMap[ActorRef, UUID] = mutable.HashMap()

Answer 1

My Stupidity.
Actually, ActorRef is already provided in my custom implementation of Actor, and I can use it.
class MyWebSocketActor(sh: HandleSocket, out: ActorRef) extends Actor {
def receive = {
case msg: String => {
Json.fromJson[SocketParsedMessage](Json.parse(msg)) match {
case s: JsSuccess[SocketParsedMessage] => {
sh.HandleSocketMessages(out, s.get)
}
case _: JsError => {
out ! PoisonPill
}
}
// println(parsedMsg)
// out ! (msg)
}
}
override def postStop(): Unit = {
// super.postStop()
sh.clientDisconnected(out)
}
}