Hi Vladimir, it is possible to complete the request with a Source (no materialization needed) if you provide a marshaller for the source. You need marshaller in this case basically only to set the content type of your response.
In your case, you would prepare a Source with: val mySource = Source.actorPublisher[UserRegisterSource.RegisterUser](UserRegisterSource.props) .mapAsync(1)(fakeSaveUserAndReturnCreatedUserId) and then use mySource to complete the request. You can find an example of marshaller for a Source in the akka-see <https://github.com/hseeberger/akka-sse/blob/0f35dc492f75a03e9091be5c7d0e04ff45f3f0de/akka-sse/src/main/scala/de/heikoseeberger/akkasse/EventStreamMarshalling.scala#L40> project. On Tue, Jun 9, 2015 at 2:55 PM, Владимир Морозов <[email protected]> wrote: > Hi, > > I try to write complete code example: > > import akka.actor.{ActorSystem, Props}import akka.http.scaladsl._import > akka.http.scaladsl.server.Directives._import > akka.http.scaladsl.server._import akka.stream.ActorFlowMaterializerimport > akka.stream.actor.ActorPublisherimport akka.stream.scaladsl.{Sink, Source} > import scala.annotation.tailrecimport scala.concurrent.Future > object UserRegisterSource { > def props: Props = Props[UserRegisterSource] > > final case class RegisterUser(username: String) > } > class UserRegisterSource extends > ActorPublisher[UserRegisterSource.RegisterUser] { > > import UserRegisterSource._ > import akka.stream.actor.ActorPublisherMessage._ > > val MaxBufferSize = 100 > var buf = Vector.empty[RegisterUser] > > override def receive: Receive = { > case request: RegisterUser => > if (buf.isEmpty && totalDemand > 0) > onNext(request) > else { > buf :+= request > deliverBuf() > } > case Request(_) => > deliverBuf() > case Cancel => > context.stop(self) > } > > @tailrec final def deliverBuf(): Unit = > if (totalDemand > 0) { > if (totalDemand <= Int.MaxValue) { > val (use, keep) = buf.splitAt(totalDemand.toInt) > buf = keep > use foreach onNext > } else { > val (use, keep) = buf.splitAt(Int.MaxValue) > buf = keep > use foreach onNext > deliverBuf() > } > }} > object Main extends App { > val host = "127.0.0.1" > val port = 8094 > > implicit val system = ActorSystem("my-testing-system") > implicit val fm = ActorFlowMaterializer() > implicit val executionContext = system.dispatcher > > val serverSource: Source[Http.IncomingConnection, > Future[Http.ServerBinding]] = Http(system).bind(interface = host, port = port) > > val mySource = > Source.actorPublisher[UserRegisterSource.RegisterUser](UserRegisterSource.props) > val requestProcessor = mySource > .mapAsync(1)(fakeSaveUserAndReturnCreatedUserId) > .to(Sink.head[Int]) > .run() > > val route: Route = > get { > path("test") { > parameter('test) { case t: String => > requestProcessor ! UserRegisterSource.RegisterUser(t) > > ??? > } > } > } > > def fakeSaveUserAndReturnCreatedUserId(param: > UserRegisterSource.RegisterUser): Future[Int] = > Future.successful { > 1 > } > > serverSource.to(Sink.foreach { > connection => > connection handleWith Route.handlerFlow(route) > }).run()} > > > I want return(obtain) Int value from stream in place with ??? in my code > example. > > Main Idea: > 1) akka-http accept request for registering user > 2) Then code I call mySource actor - do user registration > 3) I want to answer with user Id to HttpClient that call registration > > Now I have code that cover first two step and I need third... > > PS: I hope I have described well enough that I want, and that it does not > get done > > вторник, 9 июня 2015 г., 14:46:11 UTC+3 пользователь √ написал: >> >> Hi, >> >> I don't understand what you mean. What does "Does not solve my problem" >> mean in this case? >> What -is- the result of the flow? >> >> On Tue, Jun 9, 2015 at 9:30 AM, Владимир Морозов <[email protected]> >> wrote: >> >>> Hi, >>> >>> Oh... but if I change Sink.ignore to Sink.head[String] (for example) it >>> not solve my problem, because ref (my stream) have type ActorRef. >>> What type of Sink I need to use, for obtain result of flow, if as source >>> used actorPublisher? >>> >>> вторник, 9 июня 2015 г., 10:23:41 UTC+3 пользователь √ написал: >>>> >>>> The results will travel to the Sink, so you'll have to not `ignore` the >>>> result. >>>> >>>> On Tue, Jun 9, 2015 at 9:15 AM, Владимир Морозов <[email protected]> >>>> wrote: >>>> >>>>> Hi, >>>>> >>>>> I play more with actorPublisher, yes it is great thing, but - when I >>>>> have stream like this: >>>>> >>>>> val jobManagerSource = Source.actorPublisher[UserRegisterSource. >>>>> RegisterUser](UserRegisterSource.props) >>>>> >>>>> val ref = Flow[UserRegisterSource.RegisterUser] >>>>> .mapAsync(1)(callMe) >>>>> .to(Sink.ignore) >>>>> .runWith(jobManagerSource) >>>>> >>>>> ref ? UserRegisterSource.RegisterUser("test") >>>>> >>>>> And then ask it, like in previous message, in ask result I see what >>>>> jobManagerSource answer me. I can't understand how I can send some >>>>> value to actorPublisher source and then obtain result of flow >>>>> execution >>>>> >>>>> понедельник, 8 июня 2015 г., 1:10:01 UTC+3 пользователь Владимир >>>>> Морозов написал: >>>>> >>>>>> I solve this problem, but found new one: >>>>>> >>>>>> val ref = Flow[UserRegisterSource.RegisterUser] >>>>>> .mapAsync(1)(callMe) >>>>>> .to(Sink.ignore) >>>>>> .runWith(jobManagerSource) >>>>>> >>>>>> val t = (ref ask >>>>>> UserRegisterSource.RegisterUser("test")).mapTo[UserRegisterSource.RegisterUser] >>>>>> >>>>>> but t never complete, always end with Timeout exception >>>>>> >>>>>> воскресенье, 7 июня 2015 г., 23:13:29 UTC+3 пользователь Владимир >>>>>> Морозов написал: >>>>>>> >>>>>>> Hi, >>>>>>> >>>>>>> I try but get error message: >>>>>>> >>>>>>> java.lang.IllegalStateException: onNext is not allowed when the >>>>>>> stream has not requested elements, totalDemand was 0 >>>>>>> >>>>>>> My code is: >>>>>>> >>>>>>> val jobManagerSource = >>>>>>> Source.actorPublisher[UserRegisterSource.RegisterUser](UserRegisterSource.props) >>>>>>> >>>>>>> val ref = Flow[UserRegisterSource.RegisterUser] >>>>>>> .mapAsync(1)(callMe) >>>>>>> .to(Sink.ignore) >>>>>>> .runWith(jobManagerSource) >>>>>>> >>>>>>> ref ! UserRegisterSource.RegisterUser("test") >>>>>>> >>>>>>> >>>>>>> class UserRegisterSource extends >>>>>>> ActorPublisher[UserRegisterSource.RegisterUser] { >>>>>>> >>>>>>> import akka.stream.actor.ActorPublisherMessage._ >>>>>>> import UserRegisterSource._ >>>>>>> >>>>>>> val MaxBufferSize = 100 >>>>>>> var buf = Vector.empty[RegisterUser] >>>>>>> >>>>>>> override def receive: Receive = { >>>>>>> case request: RegisterUser => >>>>>>> onNext(request) >>>>>>> case Cancel => >>>>>>> context.stop(self) >>>>>>> } >>>>>>> } >>>>>>> >>>>>>> >>>>>>> воскресенье, 7 июня 2015 г., 14:53:15 UTC+3 пользователь Akka Team >>>>>>> написал: >>>>>>>> >>>>>>>> Hi, >>>>>>>> >>>>>>>> On Fri, Jun 5, 2015 at 7:53 PM, Владимир Морозов < >>>>>>>> [email protected]> wrote: >>>>>>>> >>>>>>>>> Yes, I know about mapAsync, but my problem with Source. A want to >>>>>>>>> use single stream for processing some group of events >>>>>>>>> >>>>>>>> >>>>>>>> I am not sure if I understand your question properly, but if you >>>>>>>> want to run the stream *once* and then reuse the stream for all the >>>>>>>> requests, then you can try to create an ActorPublisher as your Source, >>>>>>>> then >>>>>>>> run the stream outside of the Http handler logic. You can then use >>>>>>>> "ask" on >>>>>>>> that actor in the Http route. >>>>>>>> >>>>>>>> -Endre >>>>>>>> >>>>>>>> >>>>>>>>> >>>>>>>>> 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. >>>>>>>>>>> >>>>>>>>>>> -- >>>>>>>>> >>>>>>>>>> Read the docs: http://akka.io/docs/ >>>>>>>>> >>>>>>>>>> Check the FAQ: >>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html >>>>>>>>> >>>>>>>>>> Search the archives: >>>>>>>>> https://groups.google.com/group/akka-user >>>>>>>>> --- >>>>>>>>> You received this message because you are subscribed to the Google >>>>>>>>> Groups "Akka User List" group. >>>>>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>>>>> send an email to [email protected]. >>>>>>>>> To post to this group, send email to [email protected]. >>>>>>>>> Visit this group at http://groups.google.com/group/akka-user. >>>>>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> -- >>>>>>>> Akka Team >>>>>>>> Typesafe - Reactive apps on the JVM >>>>>>>> Blog: letitcrash.com >>>>>>>> Twitter: @akkateam >>>>>>>> >>>>>>> -- >>>>> >>>>>>>>>> Read the docs: http://akka.io/docs/ >>>>> >>>>>>>>>> Check the FAQ: >>>>> http://doc.akka.io/docs/akka/current/additional/faq.html >>>>> >>>>>>>>>> Search the archives: >>>>> https://groups.google.com/group/akka-user >>>>> --- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "Akka User List" group. >>>>> To unsubscribe from this group and stop receiving emails from it, send >>>>> an email to [email protected]. >>>>> To post to this group, send email to [email protected]. >>>>> Visit this group at http://groups.google.com/group/akka-user. >>>>> For more options, visit https://groups.google.com/d/optout. >>>>> >>>> >>>> >>>> >>>> -- >>>> Cheers, >>>> √ >>>> >>> -- >>> >>>>>>>>>> Read the docs: http://akka.io/docs/ >>> >>>>>>>>>> Check the FAQ: >>> http://doc.akka.io/docs/akka/current/additional/faq.html >>> >>>>>>>>>> Search the archives: >>> https://groups.google.com/group/akka-user >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "Akka User List" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> To post to this group, send email to [email protected]. >>> Visit this group at http://groups.google.com/group/akka-user. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> >> >> -- >> Cheers, >> √ >> > -- > >>>>>>>>>> Read the docs: http://akka.io/docs/ > >>>>>>>>>> Check the FAQ: > http://doc.akka.io/docs/akka/current/additional/faq.html > >>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user > --- > You received this message because you are subscribed to the Google Groups > "Akka User List" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/akka-user. > For more options, visit https://groups.google.com/d/optout. > -- Martynas Mickevičius Typesafe <http://typesafe.com/> – Reactive <http://www.reactivemanifesto.org/> Apps on the JVM -- >>>>>>>>>> Read the docs: http://akka.io/docs/ >>>>>>>>>> Check the FAQ: >>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html >>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user --- You received this message because you are subscribed to the Google Groups "Akka User List" group. 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