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+str #19390 Add 'monitor' flow combinator and stage

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Tal Pressman 2016-02-21 13:03:00 +02:00 • committed by Patrik Nordwall
parent bd8fcc9d9a
commit 26c25c89ed
12 changed files with 272 additions and 13 deletions
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23
akka-stream/src/main/scala/akka/stream/scaladsl/Flow.scala
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@ -7,7 +7,7 @@ import akka.event.LoggingAdapter
import akka.stream._
import akka.Done
import akka.stream.impl.Stages.{ DirectProcessor, StageModule }
import akka.stream.impl.StreamLayout.{ Module }
import akka.stream.impl.StreamLayout.Module
import akka.stream.impl._
import akka.stream.impl.fusing._
import akka.stream.stage.AbstractStage.{ PushPullGraphStage, PushPullGraphStageWithMaterializedValue }
@ -16,7 +16,7 @@ import org.reactivestreams.{ Processor, Publisher, Subscriber, Subscription }
import scala.annotation.unchecked.uncheckedVariance
import scala.collection.immutable
import scala.concurrent.Future
import scala.concurrent.duration.{ FiniteDuration }
import scala.concurrent.duration.FiniteDuration
import scala.language.higherKinds
import akka.stream.impl.fusing.FlattenMerge
@ -375,7 +375,10 @@ final case class RunnableGraph[+Mat](private[stream] val module: StreamLayout.Mo
/**
* Scala API: Operations offered by Sources and Flows with a free output side: the DSL flows left-to-right only.
*
* INTERNAL API: extending this trait is not supported under the binary compatibility rules for Akka.
* INTERNAL API: this trait will be changed in binary-incompatible ways for classes that are derived from it!
* Do not implement this interface outside the Akka code base!
*
* Binary compatibility is only maintained for callers of this trait’s interface.
*/
trait FlowOps[+Out, +Mat] {
import akka.stream.impl.Stages._
@ -1803,7 +1806,10 @@ trait FlowOps[+Out, +Mat] {
}
/**
* INTERNAL API: extending this trait is not supported under the binary compatibility rules for Akka.
* INTERNAL API: this trait will be changed in binary-incompatible ways for classes that are derived from it!
* Do not implement this interface outside the Akka code base!
*
* Binary compatibility is only maintained for callers of this trait’s interface.
*/
trait FlowOpsMat[+Out, +Mat] extends FlowOps[Out, Mat] {
@ -1995,6 +2001,15 @@ trait FlowOpsMat[+Out, +Mat] extends FlowOps[Out, Mat] {
*/
def mapMaterializedValue[Mat2](f: Mat ⇒ Mat2): ReprMat[Out, Mat2]
/**
* Materializes to `FlowMonitor[Out]` that allows monitoring of the the current flow. All events are propagated
* by the monitor unchanged. Note that the monitor inserts a memory barrier every time it processes an
* event, and may therefor affect performance.
* The `combine` function is used to combine the `FlowMonitor` with this flow's materialized value.
*/
def monitor[Mat2]()(combine: (Mat, FlowMonitor[Out]) => Mat2): ReprMat[Out, Mat2] =
viaMat(GraphStages.monitor)(combine)
/**
* INTERNAL API.
*/