What is Int, Out type in Akka (Scala)












1















I am researching about Akka Stream. When i read an example about Balance in Akka.



What is In and Out type in this example?



def balancer[In, Out](worker: Flow[In, Out, Any], workerCount: Int): Flow[In, Out, NotUsed] = {
import GraphDSL.Implicits._

Flow.fromGraph(GraphDSL.create() { implicit b ⇒
val balancer = b.add(Balance[In](workerCount, waitForAllDownstreams = true))
val merge = b.add(Merge[Out](workerCount))

for (_ ← 1 to workerCount) {
// for each worker, add an edge from the balancer to the worker, then wire
// it to the merge element
balancer ~> worker.async ~> merge
}

FlowShape(balancer.in, merge.out)
})
}

val processedJobs: Source[Result, NotUsed] = myJobs.via(balancer(worker, 3))









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  • They are InputType and OutputType for your Flow.

    – Ra Ka
    Dec 31 '18 at 7:15
















1















I am researching about Akka Stream. When i read an example about Balance in Akka.



What is In and Out type in this example?



def balancer[In, Out](worker: Flow[In, Out, Any], workerCount: Int): Flow[In, Out, NotUsed] = {
import GraphDSL.Implicits._

Flow.fromGraph(GraphDSL.create() { implicit b ⇒
val balancer = b.add(Balance[In](workerCount, waitForAllDownstreams = true))
val merge = b.add(Merge[Out](workerCount))

for (_ ← 1 to workerCount) {
// for each worker, add an edge from the balancer to the worker, then wire
// it to the merge element
balancer ~> worker.async ~> merge
}

FlowShape(balancer.in, merge.out)
})
}

val processedJobs: Source[Result, NotUsed] = myJobs.via(balancer(worker, 3))









share|improve this question























  • They are InputType and OutputType for your Flow.

    – Ra Ka
    Dec 31 '18 at 7:15














1












1








1








I am researching about Akka Stream. When i read an example about Balance in Akka.



What is In and Out type in this example?



def balancer[In, Out](worker: Flow[In, Out, Any], workerCount: Int): Flow[In, Out, NotUsed] = {
import GraphDSL.Implicits._

Flow.fromGraph(GraphDSL.create() { implicit b ⇒
val balancer = b.add(Balance[In](workerCount, waitForAllDownstreams = true))
val merge = b.add(Merge[Out](workerCount))

for (_ ← 1 to workerCount) {
// for each worker, add an edge from the balancer to the worker, then wire
// it to the merge element
balancer ~> worker.async ~> merge
}

FlowShape(balancer.in, merge.out)
})
}

val processedJobs: Source[Result, NotUsed] = myJobs.via(balancer(worker, 3))









share|improve this question














I am researching about Akka Stream. When i read an example about Balance in Akka.



What is In and Out type in this example?



def balancer[In, Out](worker: Flow[In, Out, Any], workerCount: Int): Flow[In, Out, NotUsed] = {
import GraphDSL.Implicits._

Flow.fromGraph(GraphDSL.create() { implicit b ⇒
val balancer = b.add(Balance[In](workerCount, waitForAllDownstreams = true))
val merge = b.add(Merge[Out](workerCount))

for (_ ← 1 to workerCount) {
// for each worker, add an edge from the balancer to the worker, then wire
// it to the merge element
balancer ~> worker.async ~> merge
}

FlowShape(balancer.in, merge.out)
})
}

val processedJobs: Source[Result, NotUsed] = myJobs.via(balancer(worker, 3))






scala akka akka-stream






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asked Dec 31 '18 at 7:06









Toan NguyenToan Nguyen

114




114













  • They are InputType and OutputType for your Flow.

    – Ra Ka
    Dec 31 '18 at 7:15



















  • They are InputType and OutputType for your Flow.

    – Ra Ka
    Dec 31 '18 at 7:15

















They are InputType and OutputType for your Flow.

– Ra Ka
Dec 31 '18 at 7:15





They are InputType and OutputType for your Flow.

– Ra Ka
Dec 31 '18 at 7:15












1 Answer
1






active

oldest

votes


















1














From the definition of Flow:




Flow



A processing stage which has exactly one input and output, which
connects its up- and downstreams by transforming the data elements
flowing through it.




Generally speaking, In and Out are type parameters. Specifically, they are used to convey the input type, which is type you put into the stream, and the output type which is the type produced by the stream.






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    1 Answer
    1






    active

    oldest

    votes








    1 Answer
    1






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    1














    From the definition of Flow:




    Flow



    A processing stage which has exactly one input and output, which
    connects its up- and downstreams by transforming the data elements
    flowing through it.




    Generally speaking, In and Out are type parameters. Specifically, they are used to convey the input type, which is type you put into the stream, and the output type which is the type produced by the stream.






    share|improve this answer




























      1














      From the definition of Flow:




      Flow



      A processing stage which has exactly one input and output, which
      connects its up- and downstreams by transforming the data elements
      flowing through it.




      Generally speaking, In and Out are type parameters. Specifically, they are used to convey the input type, which is type you put into the stream, and the output type which is the type produced by the stream.






      share|improve this answer


























        1












        1








        1







        From the definition of Flow:




        Flow



        A processing stage which has exactly one input and output, which
        connects its up- and downstreams by transforming the data elements
        flowing through it.




        Generally speaking, In and Out are type parameters. Specifically, they are used to convey the input type, which is type you put into the stream, and the output type which is the type produced by the stream.






        share|improve this answer













        From the definition of Flow:




        Flow



        A processing stage which has exactly one input and output, which
        connects its up- and downstreams by transforming the data elements
        flowing through it.




        Generally speaking, In and Out are type parameters. Specifically, they are used to convey the input type, which is type you put into the stream, and the output type which is the type produced by the stream.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Dec 31 '18 at 9:18









        Yuval ItzchakovYuval Itzchakov

        114k26171240




        114k26171240






























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