Thanks; so my new code is
logger.info("Create a Source based on a simple Iterable[T]")
val source = Source(1 to 10)
logger.info("create redundant flow1 because of Akka Streams API design
limitations")
val flow1 = Flow[Int].map(int => int)
logger.info("Create sink1 that can be connected to the Source" )
//val sink1 = Sink.foreach { int: Int => logger.info("sink1: " + int) }
val sink1 = Sink.foreach{ int: Int => logger.info("sink1: " + int) }
logger.info("Connect the Source to the sink1, obtaining a runnableFlow1")
//val runnableFlow1: RunnableFlow[Unit] = source.to(sink1)
val runnableFlow1 = (source via flow1).toMat(sink1)(Keep.right)
logger.info("Create flowMaterializer1")
val flowMaterializer1 = ActorFlowMaterializer()
logger.info("Materialize runnableFlow1 as materializedFlow1")
val materializedFlow1 = runnableFlow1.run()(flowMaterializer1)
materializedFlow1.onComplete(result => system.shutdown())
I wish this did not have to be so complicated. While I understand this is
still experimental, I hope some effort goes into simplifying the API
design. In particular, in my original code, I don't understand why
materializedFlow1 is Unit and not Future[Unit]. Also, why do explicitly
need to create the Flow, why can't the FlowMaterializer do that implicitly
if it needs to?
Sadly Keep is not defined in
http://doc.akka.io/api/akka-stream-and-http-experimental/0.10/#akka.stream.scaladsl.package
so there is no way to know what it does.
Also, is there some overriding reason that the method .toMat() cannot
simply be called .toMaterializer()?
- Eric
On Thursday, 11 June 2015 15:40:48 UTC-7, √ wrote:
>
> Hi Eric,
>
> You'll need to instruct the connect of the Sink to keep its materialized
> value rather than the Flows:
>
> val src = Source(immutable.Seq(1,2,3))
> val flo = Flow[Int].map(_ * 2)
> val sin = Sink.foreach(println)
> val runFlow = (src via flo).toMat(sin)(Keep.right)
> val fut = runFlow.run()
>
> fut.onComplete(_ => sys.shutdown())
>
>
> On Thu, Jun 11, 2015 at 6:26 PM, Eric Kolotyluk <eric.ko...@gmail.com
> <javascript:>> wrote:
>
>> I have some simple code
>>
>> logger.info( "Hello World!" )
>>
>> implicit val system = ActorSystem("System")
>> import system.dispatcher
>>
>> logger.info("Create a Source based on a simple Iterable[T]")
>> val source = Source(1 to 10)
>>
>> logger.info("Create sink1 that can be connected to the Source" )
>> val sink1 = Sink.foreach { int: Int => logger.info("sink1: " + int) }
>>
>> logger.info("Connect the Source to the sink1, obtaining a
>> runnableFlow1")
>> val runnableFlow1: RunnableFlow[Unit] = source.to(sink1)
>>
>> logger.info("Create flowMaterializer1")
>> val flowMaterializer1 = ActorFlowMaterializer()
>>
>> logger.info("Materialize runnableFlow1 as materializedFlow1")
>> val materializedFlow1 = runnableFlow1.run()(flowMaterializer1)
>>
>> // How do I know when materializedFlow1 is finished so I can shut down
>> the actor system?
>>
>> Cheers, Eric
>>
>> --
>> >>>>>>>>>> Read the docs: http://akka.io/docs/
>> >>>>>>>>>> Check the FAQ:
>> http://doc.akka.io/docs/akka/current/additional/faq.html
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>
>
>
> --
> Cheers,
> √
>
--
>>>>>>>>>> Read the docs: http://akka.io/docs/
>>>>>>>>>> Check the FAQ:
>>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html
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