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
>>>> ---
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>>>> To post to this group, send email to [email protected].
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>>>> 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
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