Hi again, I have a very specific case. My flow looks like this one:
<https://lh3.googleusercontent.com/-qrP4yHkVYI8/WAaAO1-q67I/AAAAAAAAAbw/acUT-YaG48k0lo7MkePGv9QVVRkH5L_BACLcB/s1600/Flow.png> The idea of multi input/output shape was to redirect messages to a right output based on the message data. I just learn streams, so maybe you can suggest a better solution? Thanks! Cheers, Sergey вторник, 18 октября 2016 г., 18:34:22 UTC+3 пользователь Rafał Krzewski написал: > > It's not clear to me, what are you trying to accomplish. It looks like you > are trying to implement AmorphousShape (ie. arbitrary number of open inlets > and outlets) on your own, and then a specific variant of it, that has all > inlets sharing the same type, and all outlets sharing another type. The > "Fan" fragment in the names you used is a bit misleading, since in Akka > Stream's own usage of it names like FanIn / FanOut shape mean that such > grap has many inlets and single outlet / single inlet many outlets. The > analogy is to a Chinese-style hand held fan, rather than ceiling fan with > many blades :) I am wondering what use case you have in mind for your > AmorphousShape because the graphs that can be materialized and executed > must ultimately have a ClosedShape. You could use such multi-outlet graphs > for reusing pieces of functionality, but anything more complex than a > BidiShape seems rather unwieldy to me. > > My understanding is that Graph's shape should not interfere with message > flow, because it's just a canvas with contact points on the perimeter. What > matters are the components that you plug into it. Akka just makes sure that > you don't leave any of the contact points dangling. This makes me think > that the problems with messages getting "stuck" was caused somewhere other > than graph shape construction site. > > Have you tried inserting probes alon the lines of Flow.alsoTo(Sink.foreach(_ > => println("beep!"))) (shooting from the hip here, apologies if it does > not compile straight away) into your graph? That could help you locate > where the messages are stuck / discarded. > > Cheers, > Rafał > > W dniu poniedziałek, 17 października 2016 20:22:43 UTC+2 użytkownik Sergey > Sopin napisał: >> >> Hi, >> >> I am trying to create my own akka streams shape with several Inlets and >> Outlets. I have written following code: >> >> package kernel.modeller.workers.streamFinder.generic >> >> import akka.stream.{Shape, Outlet, Inlet} >> import scala.annotation.unchecked.uncheckedVariance >> import scala.collection.immutable >> >> object FanShape { >> sealed trait Init[_] { >> def inlets: immutable.Seq[Inlet[_]] >> def outlets: immutable.Seq[Outlet[_]] >> def name: String >> } >> final case class Name[_](override val name: String) extends Init[Any] { >> override def inlets: immutable.Seq[Inlet[_]] = Nil >> override def outlets: immutable.Seq[Outlet[_]] = Nil >> } >> final case class Ports[_](override val inlets: immutable.Seq[Inlet[_]], >> override val outlets: immutable.Seq[Outlet[_]]) extends Init[Any] { >> override def name: String = "FanShape" >> } >> } >> >> abstract class FanShape[_] private (_in: Iterator[Inlet[_]], _out: >> Iterator[Outlet[_]], _name: String) extends Shape { >> >> import FanShape._ >> >> def this(init: FanShape.Init[_]) = this(init.inlets.iterator, >> init.outlets.iterator, init.name) >> >> final override def outlets: immutable.Seq[Outlet[_]] = _outlets >> final override def inlets: immutable.Seq[Inlet[_]] = _inlets >> >> private var _outlets: Vector[Outlet[_]] = Vector.empty >> private var _inlets: Vector[Inlet[_]] = Vector.empty >> >> protected def newOutlet[T](name: String): Outlet[T] = { >> val p = if (_out.hasNext) _out.next().asInstanceOf[Outlet[T]] else >> Outlet[T](s"${_name}.$name") >> _outlets :+= p >> p >> } >> >> protected def newInlet[T](name: String): Inlet[T] = { >> val p = if (_in.hasNext) _in.next().asInstanceOf[Inlet[T]] else >> Inlet[T](s"${_name}.$name") >> _inlets :+= p >> p >> } >> >> protected def construct(init: Init[_]): FanShape[_] >> >> def deepCopy(): FanShape[_] = construct(Ports(inlets.map(_.carbonCopy()), >> outlets.map(_.carbonCopy()))) >> final def copyFromPorts(inlets: immutable.Seq[Inlet[_]], outlets: >> immutable.Seq[Outlet[_]]): FanShape[_] = { >> require(outlets.size == _outlets.size, s"proposed outlets >> [${outlets.mkString(", ")}] do not fit FanShape") >> require(inlets.size == _inlets.size, s"proposed inlects >> [${inlets.mkString(", ")}] do not fit FanShape") >> construct(Ports(inlets, outlets)) >> } >> } >> >> object UniformFanShape { >> def apply[I, O](inlets: Array[Inlet[I]], outlets: Outlet[O]*): >> UniformFanShape[I, O] = >> new UniformFanShape(inlets.size, outlets.size, >> FanShape.Ports(inlets.toList, outlets.toList)) >> } >> >> class UniformFanShape[-I, +O](n: Int, m: Int, _init: FanShape.Init[_]) >> extends FanShape(_init) { >> def this(n: Int, m: Int) = this (n, m, FanShape.Name("UniformFan")) >> def this(n: Int, m: Int, name: String) = this(n, m, FanShape.Name(name)) >> def this(inlets: Array[Inlet[I]], outlets: Array[Outlet[O]]) = >> this(inlets.size, outlets.size, FanShape.Ports(inlets.toList, >> outlets.toList)) >> override protected def construct(init: FanShape.Init[_]): FanShape[_] = >> new UniformFanShape(n, m, init) >> override def deepCopy(): UniformFanShape[I, O] = >> super.deepCopy().asInstanceOf[UniformFanShape[I, O]] >> >> val inArray: Array[Inlet[I @uncheckedVariance]] = Array.tabulate(n)(i ⇒ >> newInlet[I](s"in$i")) >> def in(n: Int): Inlet[I @uncheckedVariance] = inArray(n) >> >> val outArray: Array[Outlet[O @uncheckedVariance]] = Array.tabulate(m)(j ⇒ >> newOutlet[O](s"out$j")) >> def out(m: Int): Outlet[O @uncheckedVariance] = outArray(m) >> } >> >> >> This code allows creating graph, however, it is not possible to process >> messages with it. It doesn't call handlers for messages, they get stuck >> somewhere. >> Could you please help me to fix it? >> >> PS: I am not an expert in Scala. >> >> Thank you in advance! >> >> Regards, >> Sergey >> > -- >>>>>>>>>> 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 akka-user+unsubscr...@googlegroups.com. To post to this group, send email to akka-user@googlegroups.com. Visit this group at https://groups.google.com/group/akka-user. For more options, visit https://groups.google.com/d/optout.
