Giovanni, hi!
I used a way similar to the the first suggestion, but wasn't sure it is
elegant way to wrap zero into Future on rewriting folding function.
So, I'll experiment with both ways when some benchmarks be ready. And I
need some time to dig in the second suggestion :)
Thanks!!
On Saturday, March 5, 2016 at 7:41:18 PM UTC+3, Giovanni Alberto
Caporaletti wrote:
>
> how about this:
>
> def foldM[U, T](zero: U)(f: (U, T) ⇒ Future[U]): Sink[T, Future[U]] = {
> Sink
> .fold[Future[U], T](Future.successful(zero))((fu, t) => fu.flatMap(f(_,
> t)))
> .mapMaterializedValue(_ flatMap identity)
> }
>
> or this:
>
> def foldM[U, T](zero: U)(f: (U, T) ⇒ Future[U]): Sink[T, Future[U]] = {
> Flow[T]
> .fold(Future.successful(zero))((fu, t) => fu.flatMap(f(_, t)))
> .mapAsync(1)(identity)
> .toMat(Sink.head)(Keep.right)
> }
>
>
>
> On Saturday, 5 March 2016 17:00:08 UTC+1, Andrew Gaydenko wrote:
>>
>> Hi! There is
>>
>> f: (U, T) ⇒ Future[U]
>>
>> rather than
>>
>> f: (U, T) ⇒ U
>>
>> in hands. How to create
>>
>> Sink[T, Future[U]]
>>
>> ?
>>
>
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