Good luck -- I've been doing a lot with tagless final in my Akka Sharded /
Persistent code, and have the beginnings of a library for that
<https://github.com/jducoeur/Querki/tree/master/querki/scalajvm/app/funcakka>,
but I've found that *completely* doing away with the Futures is pretty
challenging. I've gotten it most of the way there, but I still have to
cheat occasionally...
On Tue, Jun 13, 2017 at 12:44 PM, Jeff <jknight12...@gmail.com> wrote:
> I am trying to learn tagless final style to remove concrete monads (ie
> futures) from my code. I have come up with the following strawman
> application (using cats)
>
> class RestaurantRoutes[F[_]: Monad](algebra: RestaurantAlgebra[F]) {
> import algebra._
>
> def route: Route =
> path("api" / "v4.0" / "restaurant" / IntNumber) { rid =>
> get {
> complete(getRestaurantById(rid).map(_.toString).value)
> }
> }
> }
>
> object RestaurantRoutes {
> def apply()(implicit ec: ExecutionContext): RestaurantRoutes[FutureOfOption]
> = {
> import cats.instances.future._
>
> new RestaurantRoutes(new RestaurantFutureInterpreter())
> }
>
> }
>
> the final type of
>
> getRestaurantById(rid).map(_.toString).value
>
> is a
>
> Future[Option[String]]
>
> However, I can't seem to figure out to get that marshalled. A marshaller
> exists for all those types, and had I had concrete types intstead of F[_],
> it would have worked. What is the best way to handle this to prevent
> implementation details from leaking in?
>
> Thanks
> Jeff
>
> --
> >>>>>>>>>> Read the docs: http://akka.io/docs/
> >>>>>>>>>> Check the FAQ: http://doc.akka.io/docs/akka/
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>>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html
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