The problem with this solution is absence of actorRef during upstream
complete. Any ideas how to get it?
пятница, 16 октября 2015 г., 15:18:51 UTC+6 пользователь Alexey Romanchuk
написал:
>
> 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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