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Merge pull request #22551 from akka/wip-lazy-TraversalBuilder-patriknw

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remove lazy from TraversalBuilder field
This commit is contained in:
Patrik Nordwall 2017-03-14 13:29:49 +01:00 • committed by GitHub
commit e77c3c3e8a
1 changed files with 13 additions and 3 deletions
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16
akka-stream/src/main/scala/akka/stream/stage/GraphStage.scala
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@ -22,6 +22,7 @@ import scala.concurrent.duration.FiniteDuration
import akka.stream.actor.ActorSubscriberMessage
import akka.stream.scaladsl.{ GenericGraph, GenericGraphWithChangedAttributes }
import akka.util.OptionVal
import akka.annotation.InternalApi
abstract class GraphStageWithMaterializedValue[+S <: Shape, +M] extends Graph[S, M] {
@ -30,9 +31,18 @@ abstract class GraphStageWithMaterializedValue[+S <: Shape, +M] extends Graph[S,
protected def initialAttributes: Attributes = Attributes.none
final override lazy val traversalBuilder: TraversalBuilder = {
val attr = initialAttributes
TraversalBuilder.atomic(GraphStageModule(shape, attr, this), attr)
private var _traversalBuilder: TraversalBuilder = null
/**
* INTERNAL API
*/
@InternalApi private[akka] final override def traversalBuilder: TraversalBuilder = {
// _traversalBuilder instance is cached to avoid allocations, no need for volatile or synchronization
if (_traversalBuilder eq null) {
val attr = initialAttributes
_traversalBuilder = TraversalBuilder.atomic(GraphStageModule(shape, attr, this), attr)
}
_traversalBuilder
}
final override def withAttributes(attr: Attributes): Graph[S, M] =