Packages

final class FlowWithContext[-In, -CtxIn, +Out, +CtxOut, +Mat] extends GraphDelegate[FlowShape[(In, CtxIn), (Out, CtxOut)], Mat] with FlowWithContextOps[Out, CtxOut, Mat]

A flow that provides operations which automatically propagate the context of an element. Only a subset of common operations from FlowOps is supported. As an escape hatch you can use FlowWithContextOps.via to manually provide the context propagation for otherwise unsupported operations.

An "empty" flow can be created by calling FlowWithContext[Ctx, T].

Source
FlowWithContext.scala
Linear Supertypes
FlowWithContextOps[Out, CtxOut, Mat], GraphDelegate[FlowShape[(In, CtxIn), (Out, CtxOut)], Mat], Graph[FlowShape[(In, CtxIn), (Out, CtxOut)], Mat], AnyRef, Any
Type Hierarchy
Ordering
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  2. By Inheritance
Inherited
  1. FlowWithContext
  2. FlowWithContextOps
  3. GraphDelegate
  4. Graph
  5. AnyRef
  6. Any
Implicitly
  1. by GraphMapMatVal
  2. by any2stringadd
  3. by StringFormat
  4. by Ensuring
  5. by ArrowAssoc
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Visibility
  1. Public
  2. Protected

Instance Constructors

  1. new FlowWithContext(delegate: Flow[(In, CtxIn), (Out, CtxOut), Mat])

Type Members

  1. type Repr[+O, +C] = ReprMat[O, C, Mat]
    Definition Classes
    FlowWithContextOps
  2. type ReprMat[+O, +C, +M] = FlowWithContext[In, CtxIn, O, C, M]
    Definition Classes
    FlowWithContextFlowWithContextOps
  3. type Shape = FlowShape[(In, CtxIn), (Out, CtxOut)]

    Type-level accessor for the shape parameter of this graph.

    Type-level accessor for the shape parameter of this graph.

    Definition Classes
    Graph

Value Members

  1. def addAttributes(attr: Attributes): Graph[FlowShape[(In, CtxIn), (Out, CtxOut)], Mat]

    Add the given attributes to this Graph.

    Add the given attributes to this Graph. If the specific attribute was already present on this graph this means the added attribute will be more specific than the existing one. If this Source is a composite of multiple graphs, new attributes on the composite will be less specific than attributes set directly on the individual graphs of the composite.

    Definition Classes
    Graph
  2. def asFlow: Flow[(In, CtxIn), (Out, CtxOut), Mat]
  3. def asJava[JIn <: In, JCtxIn <: CtxIn, JOut >: Out, JCtxOut >: CtxOut, JMat >: Mat]: javadsl.FlowWithContext[JIn, JCtxIn, JOut, JCtxOut, JMat]
  4. def async(dispatcher: String, inputBufferSize: Int): Graph[FlowShape[(In, CtxIn), (Out, CtxOut)], Mat]

    Put an asynchronous boundary around this Graph

    Put an asynchronous boundary around this Graph

    dispatcher

    Run the graph on this dispatcher

    inputBufferSize

    Set the input buffer to this size for the graph

    Definition Classes
    Graph
  5. def async(dispatcher: String): Graph[FlowShape[(In, CtxIn), (Out, CtxOut)], Mat]

    Put an asynchronous boundary around this Graph

    Put an asynchronous boundary around this Graph

    dispatcher

    Run the graph on this dispatcher

    Definition Classes
    Graph
  6. def async: Graph[FlowShape[(In, CtxIn), (Out, CtxOut)], Mat]

    Put an asynchronous boundary around this Graph

    Put an asynchronous boundary around this Graph

    Definition Classes
    Graph
  7. def collect[Out2](f: PartialFunction[Out, Out2]): Repr[Out2, CtxOut]

    Context-preserving variant of akka.stream.scaladsl.FlowOps.collect.

    Context-preserving variant of akka.stream.scaladsl.FlowOps.collect.

    Note, that the context of elements that are filtered out is skipped as well.

    Definition Classes
    FlowWithContextOps
    See also

    akka.stream.scaladsl.FlowOps.collect

  8. def filter(pred: (Out) => Boolean): Repr[Out, CtxOut]

    Context-preserving variant of akka.stream.scaladsl.FlowOps.filter.

    Context-preserving variant of akka.stream.scaladsl.FlowOps.filter.

    Note, that the context of elements that are filtered out is skipped as well.

    Definition Classes
    FlowWithContextOps
    See also

    akka.stream.scaladsl.FlowOps.filter

  9. def filterNot(pred: (Out) => Boolean): Repr[Out, CtxOut]

    Context-preserving variant of akka.stream.scaladsl.FlowOps.filterNot.

    Context-preserving variant of akka.stream.scaladsl.FlowOps.filterNot.

    Note, that the context of elements that are filtered out is skipped as well.

    Definition Classes
    FlowWithContextOps
    See also

    akka.stream.scaladsl.FlowOps.filterNot

  10. def getAttributes: Attributes
    Definition Classes
    Graph
  11. def grouped(n: Int): Repr[Seq[Out], Seq[CtxOut]]

    Context-preserving variant of akka.stream.scaladsl.FlowOps.grouped.

    Context-preserving variant of akka.stream.scaladsl.FlowOps.grouped.

    Each output group will be associated with a Seq of corresponding context elements.

    Definition Classes
    FlowWithContextOps
    See also

    akka.stream.scaladsl.FlowOps.grouped

  12. def log(name: String, extract: (Out) => Any = ConstantFun.scalaIdentityFunction)(implicit log: LoggingAdapter = null): Repr[Out, CtxOut]

    Context-preserving variant of akka.stream.scaladsl.FlowOps.log.

    Context-preserving variant of akka.stream.scaladsl.FlowOps.log.

    Definition Classes
    FlowWithContextOps
    See also

    akka.stream.scaladsl.FlowOps.log

  13. def logWithMarker(name: String, marker: (Out, CtxOut) => LogMarker, extract: (Out) => Any = ConstantFun.scalaIdentityFunction)(implicit log: MarkerLoggingAdapter = null): Repr[Out, CtxOut]

    Context-preserving variant of akka.stream.scaladsl.FlowOps.logWithMarker.

  14. def map[Out2](f: (Out) => Out2): Repr[Out2, CtxOut]

    Context-preserving variant of akka.stream.scaladsl.FlowOps.map.

    Context-preserving variant of akka.stream.scaladsl.FlowOps.map.

    Definition Classes
    FlowWithContextOps
    See also

    akka.stream.scaladsl.FlowOps.map

  15. def mapAsync[Out2](parallelism: Int)(f: (Out) => Future[Out2]): Repr[Out2, CtxOut]

    Context-preserving variant of akka.stream.scaladsl.FlowOps.mapAsync.

  16. def mapConcat[Out2](f: (Out) => IterableOnce[Out2]): Repr[Out2, CtxOut]

    Context-preserving variant of akka.stream.scaladsl.FlowOps.mapConcat.

    Context-preserving variant of akka.stream.scaladsl.FlowOps.mapConcat.

    The context of the input element will be associated with each of the output elements calculated from this input element.

    Example:

    def dup(element: String) = Seq(element, element)

    Input:

    ("a", 1) ("b", 2)

    inputElements.mapConcat(dup)

    Output:

    ("a", 1) ("a", 1) ("b", 2) ("b", 2)

    Definition Classes
    FlowWithContextOps
    See also

    akka.stream.scaladsl.FlowOps.mapConcat

  17. def mapContext[Ctx2](f: (CtxOut) => Ctx2): Repr[Out, Ctx2]

    Apply the given function to each context element (leaving the data elements unchanged).

    Apply the given function to each context element (leaving the data elements unchanged).

    Definition Classes
    FlowWithContextOps
  18. def mapError(pf: PartialFunction[Throwable, Throwable]): Repr[Out, CtxOut]

    Context-preserving variant of akka.stream.scaladsl.FlowOps.mapError.

  19. def mapMaterializedValue[Mat2](f: (Mat) => Mat2): FlowWithContext[In, CtxIn, Out, CtxOut, Mat2]

    Context-preserving variant of akka.stream.scaladsl.Flow.mapMaterializedValue.

  20. def named(name: String): Graph[FlowShape[(In, CtxIn), (Out, CtxOut)], Mat]

    Specifies the name of the Graph.

    Specifies the name of the Graph. If the name is null or empty the name is ignored, i.e. #none is returned.

    Definition Classes
    Graph
  21. final def shape: FlowShape[(In, CtxIn), (Out, CtxOut)]

    The shape of a graph is all that is externally visible: its inlets and outlets.

    The shape of a graph is all that is externally visible: its inlets and outlets.

    Definition Classes
    GraphDelegate → Graph
  22. def sliding(n: Int, step: Int = 1): Repr[Seq[Out], Seq[CtxOut]]

    Context-preserving variant of akka.stream.scaladsl.FlowOps.sliding.

    Context-preserving variant of akka.stream.scaladsl.FlowOps.sliding.

    Each output group will be associated with a Seq of corresponding context elements.

    Definition Classes
    FlowWithContextOps
    See also

    akka.stream.scaladsl.FlowOps.sliding

  23. def throttle(cost: Int, per: FiniteDuration, maximumBurst: Int, costCalculation: (Out) => Int, mode: ThrottleMode): Repr[Out, CtxOut]

    Context-preserving variant of akka.stream.scaladsl.FlowOps.throttle.

  24. def throttle(cost: Int, per: FiniteDuration, costCalculation: (Out) => Int): Repr[Out, CtxOut]

    Context-preserving variant of akka.stream.scaladsl.FlowOps.throttle.

  25. def throttle(elements: Int, per: FiniteDuration, maximumBurst: Int, mode: ThrottleMode): Repr[Out, CtxOut]

    Context-preserving variant of akka.stream.scaladsl.FlowOps.throttle.

  26. def throttle(elements: Int, per: FiniteDuration): Repr[Out, CtxOut]

    Context-preserving variant of akka.stream.scaladsl.FlowOps.throttle.

  27. def unsafeDataVia[Out2, Mat2](viaFlow: Graph[FlowShape[Out, Out2], Mat2]): Repr[Out2, CtxOut]

    Transform this flow by the regular flow.

    Transform this flow by the regular flow. The given flow works on the data portion of the stream and ignores the context.

    The given flow *must* not re-order, drop or emit multiple elements for one incoming element, the sequence of incoming contexts is re-combined with the outgoing elements of the stream. If a flow not fulfilling this requirement is used the stream will not fail but continue running in a corrupt state and re-combine incorrect pairs of elements and contexts or deadlock.

    For more background on these requirements see https://doc.akka.io/libraries/akka-core/current/stream/stream-context.html.

    Definition Classes
    FlowWithContextFlowWithContextOps
  28. def via[Out2, Ctx2, Mat2](viaFlow: Graph[FlowShape[(Out, CtxOut), (Out2, Ctx2)], Mat2]): Repr[Out2, Ctx2]

    Transform this flow by the regular flow.

    Transform this flow by the regular flow. The given flow must support manual context propagation by taking and producing tuples of (data, context).

    It is up to the implementer to ensure the inner flow does not exhibit any behaviour that is not expected by the downstream elements, such as reordering. For more background on these requirements see https://doc.akka.io/libraries/akka-core/current/stream/stream-context.html.

    This can be used as an escape hatch for operations that are not (yet) provided with automatic context propagation here.

    Definition Classes
    FlowWithContextFlowWithContextOps
    See also

    akka.stream.scaladsl.FlowOps.via

  29. def viaMat[Out2, Ctx2, Mat2, Mat3](flow: Graph[FlowShape[(Out, CtxOut), (Out2, Ctx2)], Mat2])(combine: (Mat, Mat2) => Mat3): FlowWithContext[In, CtxIn, Out2, Ctx2, Mat3]

    Transform this flow by the regular flow.

    Transform this flow by the regular flow. The given flow must support manual context propagation by taking and producing tuples of (data, context).

    It is up to the implementer to ensure the inner flow does not exhibit any behaviour that is not expected by the downstream elements, such as reordering. For more background on these requirements see https://doc.akka.io/libraries/akka-core/current/stream/stream-context.html.

    This can be used as an escape hatch for operations that are not (yet) provided with automatic context propagation here.

    The combine function is used to compose the materialized values of this flow and that flow into the materialized value of the resulting Flow.

    Definition Classes
    FlowWithContextFlowWithContextOps
    See also

    akka.stream.scaladsl.FlowOpsMat.viaMat

  30. def withAttributes(attr: Attributes): FlowWithContext[In, CtxIn, Out, CtxOut, Mat]

    Context-preserving variant of akka.stream.scaladsl.Flow.withAttributes.

Shadowed Implicit Value Members

  1. def mapMaterializedValue[M2](f: (Mat) => M2): Graph[FlowShape[(In, CtxIn), (Out, CtxOut)], M2]

    Transform the materialized value of this Graph, leaving all other properties as they were.

    Transform the materialized value of this Graph, leaving all other properties as they were.

    f

    function to map the graph's materialized value

    Implicit
    This member is added by an implicit conversion from FlowWithContext[In, CtxIn, Out, CtxOut, Mat] toGraphMapMatVal[FlowShape[(In, CtxIn), (Out, CtxOut)], Mat] performed by method GraphMapMatVal in akka.stream.Graph.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
    To access this member you can use a type ascription:
    (flowWithContext: GraphMapMatVal[FlowShape[(In, CtxIn), (Out, CtxOut)], Mat]).mapMaterializedValue(f)
    Definition Classes
    GraphMapMatVal