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 <[email protected]
> <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
>> >>>>>>>>>> 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 [email protected] <javascript:>.
>> To post to this group, send email to [email protected]
>> <javascript:>.
>> Visit this group at http://groups.google.com/group/akka-user.
>> For more options, visit https://groups.google.com/d/optout.
>>
>
>
>
> --
> Cheers,
> √
>
--
>>>>>>>>>> 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 [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/akka-user.
For more options, visit https://groups.google.com/d/optout.
