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akka.stream.impl.SubFlowImpl.scala Maven / Gradle / Ivy
/**
* Copyright (C) 2015-2017 Lightbend Inc.
*/
package akka.stream.impl
import akka.NotUsed
import akka.annotation.InternalApi
import akka.stream._
import akka.stream.scaladsl._
import language.higherKinds
/**
* INTERNAL API
*/
@InternalApi private[akka] object SubFlowImpl {
trait MergeBack[In, F[+_]] {
def apply[T](f: Flow[In, T, NotUsed], breadth: Int): F[T]
}
}
/**
* INTERNAL API
*/
@InternalApi private[akka] class SubFlowImpl[In, Out, Mat, F[+_], C](
val subFlow: Flow[In, Out, NotUsed],
mergeBackFunction: SubFlowImpl.MergeBack[In, F],
finishFunction: Sink[In, NotUsed] ⇒ C)
extends SubFlow[Out, Mat, F, C] {
override def via[T, Mat2](flow: Graph[FlowShape[Out, T], Mat2]): Repr[T] =
new SubFlowImpl[In, T, Mat, F, C](subFlow.via(flow), mergeBackFunction, finishFunction)
override def withAttributes(attr: Attributes): SubFlow[Out, Mat, F, C] =
new SubFlowImpl[In, Out, Mat, F, C](subFlow.withAttributes(attr), mergeBackFunction, finishFunction)
override def addAttributes(attr: Attributes): SubFlow[Out, Mat, F, C] =
new SubFlowImpl[In, Out, Mat, F, C](subFlow.addAttributes(attr), mergeBackFunction, finishFunction)
override def named(name: String): SubFlow[Out, Mat, F, C] =
new SubFlowImpl[In, Out, Mat, F, C](subFlow.named(name), mergeBackFunction, finishFunction)
override def async: Repr[Out] = new SubFlowImpl[In, Out, Mat, F, C](subFlow.async, mergeBackFunction, finishFunction)
override def mergeSubstreamsWithParallelism(breadth: Int): F[Out] = mergeBackFunction(subFlow, breadth)
def to[M](sink: Graph[SinkShape[Out], M]): C = finishFunction(subFlow.to(sink))
}
