Finally ended with
```scala
val managedMySource = FlowGraph.partial(MySource()) {
implicit b => source =>
val control = b.add(Flow[Command]])
val zip = b.add(Zip[ActorRef, Command])
b.materializedValue.map(Source.repeat).flatten(FlattenStrategy.concat) ~>
zip.in0
control.outlet ~> zip.in1
zip.out ~> Sink.foreach[(ActorRef, Command)] {
case (ref, cmd) => ref ! cmd
}
FlowShape(control.inlet, source.outlet)
}
```
Any ideas or comments?
пятница, 16 октября 2015 г., 11:48:27 UTC+6 пользователь Alexey Romanchuk
написал:
>
> Hey hAkkers!
>
> I need your advise in akka streams materialization question.
>
> I have custom protocol source `MySource` of type`Source[String, ActorRef]`
> which accepts messages to control protocol via ActorRef after
> materialization. Example of message is something like connect to server or
> change parameters of existing connection and so on.
>
> Creation of flow with this API is easy:
>
> ```
> val actor = MySource().to(Sink.ignore).run
> actor ! SomeCommand()
> ```
>
> Next, I have `Source[Command, Unit]` and I want to be able to connect it
> to `MySource`. So I need to lift `MySource` from source to `Flow`:
>
> ```
> val source: Source[String, ActorRef] = ???
>
> //some magic with custom stage or partial flow here and
> val controlledSource: Flow[Command, String, ActorRef] = ???
> ```
>
> I tried to do it with partial flow:
>
> ```
> val flow = FlowGraph.partial() { implicit b =>
> import FlowGraph.Implicits._
> val mySource = MySource
> val commandsInput = Sink.foreach[Command](???) //I need ActorRef here
> :(
> FlowShape(b.add(commandsInput).inlet, b.add(mySource).outlet)
> }
> ```
>
> but to connect commands with source I need result of materialization.
>
> Any ideas how to keep `Source[String, ActorRef]` and have `Flow[Command,
> String, ActorRef]`?
>
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