Exploring more flexible handlers in Play

Handler.scala

trait Handler

trait HandlerOp[+A]
case class HandlerVal[+A](value: A) extends HandlerOp[A]
case class HandlerThunk[+A](thunk: () => A) extends HandlerOp[A]
case class HandlerFuture[+A](future: Future[A]) extends HandlerOp[A]
case class HandlerEither[+A,B<:A,C<:A](either: Either[B,C]) extends HandlerOp[A]

object Handler {
  trait RequestHeader
  case class PlayRequestHeader(rh: play.api.mvc.RequestHeader) extends RequestHandler

  trait Request
  case class PlayRequest[A](req: play.api.mvc.Request[A]) extends Request
  case class AkkaHttpRequest(req: HttpRequest) extends Request

  trait Response
  case class PlayResult(resp: Result) extends Response
  case class AkkaHttpResponse(resp: HttpResponse) extends Response
}

trait RequestHandler extends Handler
case class RequestHandlerOp(op: HandlerOp[RequestHandler]) extends RequestHandler
case class HeaderHandler(f: Handler.RequestHeader => HandlerOp[RequestHandler]) extends RequestHandler
case class RawRequestHandler(raw: Any => HandlerOp[ResponseHandler]) extends RequestHandler
case class


case class
case class ActionHandler(acc: Accumulator[ByteString, HandlerOp[RequestHandler]]) extends RequestHandler

trait ResponseHandler extends RequestHandler
case object UnhandledResponseHandler extends ResponseHandler
case class ResultResponse(res: Result) extends ResponseHandler
case class ResponseHandlerThunk(thunk: () => ResponseHandler) extends ResponseHandler
case class FutureResponseHandler(fut: Future[ResponseHandler]) extends ResponseHandler
case class RawResponseHandler(response: Any) extends ResponseHandler

case class RawAkkaHttpHandler(f: HttpRequest => Future[HttpResponse]) extends Handler