Yes, I know about mapAsync, but my problem with Source. A want to use
single stream for processing some group of events
пятница, 5 июня 2015 г., 20:29:16 UTC+3 пользователь Paul Kinsky написал:
>
> Use mapAsync: `def mapAsync[T](parallelism: Int)(f: (Out) ⇒ Future[T]):
> Repr[T, Mat]`.
>
> On Friday, June 5, 2015 at 9:23:24 AM UTC-7, Владимир Морозов wrote:
>>
>> Hi all,
>>
>> I have some simple application based on akka streams and http:
>>
>> My Flow items:
>>
>> val resultSink = Sink.head[String]
>>
>> val fl0 = Flow[String].map(_.toInt)
>> val fl2 = Flow[Int].map{
>> case value =>
>> Thread.sleep(10000)
>> value.toString
>> }
>> val fl3 = Flow[String].mapAsync(1)(callMe)
>>
>>
>> Part of my akka-http route:
>>
>> val route = get {
>> path("test") {
>> path("register") {
>> parameter('username) { case username: Username =>
>>
>> Source.single(username).via(fl0).via(fl2).via(fl3).runWith(resultSink):
>> Future[String]
>> }
>> }
>> }
>>
>> I want to use one flow : Source.single(username).
>> via(fl0).via(fl2).via(fl3).runWith(resultSink) for processing all
>> requests. I want this for use streams back-pressure. But I can't figure out
>> how create Source that can accept values like call def proccess(username:
>> String): Future[String] but with back-pressure, because, for example, a
>> want long-call DB in fl2 step, and DB can't accept more than 1 request
>> per time (only for example)
>>
>> With best regards, Vladimir.
>>
>>
--
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