Here is a strawman program which illustrates the issue I am having
trait RequestBuilder {
type Out
def complete(p: Promise[Out]): Unit
}
def makeRequest(in: RequestBuilder): Source[(RequestBuilder, Promise[in.Out]),
Future[in.Out]] = {
val p = Promise[in.Out]
Source.single(in -> p).mapMaterializedValue(_ => p.future)
}
val sink = MergeHub.source[(RequestBuilder, Promise[???])].to(Sink.foreach {
case (r, p) => r.complete(p)
}).run()
sink.runWith(makeRequest(new RequestBuilder {
type Out = Int
def complete(p: Promise[Out]): Unit = p.success(1)
}))
The issue is, how do I type the Promise[???] in the sink? I have been able
to work around this by making the Promise a part of the RequestBuilder
trait itself, but this seems like a code smell to me
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