final class SourceWithContext[+Out, +Ctx, +Mat] extends GraphDelegate[SourceShape[(Out, Ctx)], Mat] with FlowWithContextOps[Out, Ctx, Mat]
A source 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.
Can be created by calling Source.asSourceWithContext
- Source
- SourceWithContext.scala
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Type Members
- type Repr[+O, +C] = ReprMat[O, C, Mat]
- Definition Classes
- FlowWithContextOps
- type ReprMat[+O, +C, +M] = SourceWithContext[O, C, M]
- Definition Classes
- SourceWithContext → FlowWithContextOps
- type Shape = SourceShape[(Out, Ctx)]
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
- def addAttributes(attr: Attributes): Graph[SourceShape[(Out, Ctx)], 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
- def asJava[JOut >: Out, JCtx >: Ctx, JMat >: Mat]: javadsl.SourceWithContext[JOut, JCtx, JMat]
- def asSource: Source[(Out, Ctx), Mat]
Stops automatic context propagation from here and converts this to a regular stream of a pair of (data, context).
- def async(dispatcher: String, inputBufferSize: Int): Graph[SourceShape[(Out, Ctx)], Mat]
Put an asynchronous boundary around this
GraphPut 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
- def async(dispatcher: String): Graph[SourceShape[(Out, Ctx)], Mat]
Put an asynchronous boundary around this
GraphPut an asynchronous boundary around this
Graph- dispatcher
Run the graph on this dispatcher
- Definition Classes
- Graph
- def async: Graph[SourceShape[(Out, Ctx)], Mat]
Put an asynchronous boundary around this
GraphPut an asynchronous boundary around this
Graph- Definition Classes
- Graph
- def collect[Out2](f: PartialFunction[Out, Out2]): Repr[Out2, Ctx]
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
- def filter(pred: (Out) => Boolean): Repr[Out, Ctx]
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
- def filterNot(pred: (Out) => Boolean): Repr[Out, Ctx]
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
- def getAttributes: Attributes
- Definition Classes
- Graph
- def grouped(n: Int): Repr[Seq[Out], Seq[Ctx]]
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
Seqof corresponding context elements.- Definition Classes
- FlowWithContextOps
- See also
- def log(name: String, extract: (Out) => Any = ConstantFun.scalaIdentityFunction)(implicit log: LoggingAdapter = null): Repr[Out, Ctx]
Context-preserving variant of akka.stream.scaladsl.FlowOps.log.
Context-preserving variant of akka.stream.scaladsl.FlowOps.log.
- Definition Classes
- FlowWithContextOps
- See also
- def logWithMarker(name: String, marker: (Out, Ctx) => LogMarker, extract: (Out) => Any = ConstantFun.scalaIdentityFunction)(implicit log: MarkerLoggingAdapter = null): Repr[Out, Ctx]
Context-preserving variant of akka.stream.scaladsl.FlowOps.logWithMarker.
Context-preserving variant of akka.stream.scaladsl.FlowOps.logWithMarker.
- Definition Classes
- FlowWithContextOps
- See also
- def map[Out2](f: (Out) => Out2): Repr[Out2, Ctx]
Context-preserving variant of akka.stream.scaladsl.FlowOps.map.
Context-preserving variant of akka.stream.scaladsl.FlowOps.map.
- Definition Classes
- FlowWithContextOps
- See also
- def mapAsync[Out2](parallelism: Int)(f: (Out) => Future[Out2]): Repr[Out2, Ctx]
Context-preserving variant of akka.stream.scaladsl.FlowOps.mapAsync.
Context-preserving variant of akka.stream.scaladsl.FlowOps.mapAsync.
- Definition Classes
- FlowWithContextOps
- See also
- def mapConcat[Out2](f: (Out) => IterableOnce[Out2]): Repr[Out2, Ctx]
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
- def mapContext[Ctx2](f: (Ctx) => 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
- def mapError(pf: PartialFunction[Throwable, Throwable]): Repr[Out, Ctx]
Context-preserving variant of akka.stream.scaladsl.FlowOps.mapError.
Context-preserving variant of akka.stream.scaladsl.FlowOps.mapError.
- Definition Classes
- FlowWithContextOps
- See also
- def mapMaterializedValue[Mat2](f: (Mat) => Mat2): SourceWithContext[Out, Ctx, Mat2]
Context-preserving variant of akka.stream.scaladsl.Source.mapMaterializedValue.
Context-preserving variant of akka.stream.scaladsl.Source.mapMaterializedValue.
- def named(name: String): Graph[SourceShape[(Out, Ctx)], 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
- def runWith[Mat2](sink: Graph[SinkShape[(Out, Ctx)], Mat2])(implicit materializer: Materializer): Mat2
Connect this akka.stream.scaladsl.SourceWithContext to a akka.stream.scaladsl.Sink and run it.
Connect this akka.stream.scaladsl.SourceWithContext to a akka.stream.scaladsl.Sink and run it. The returned value is the materialized value of the
Sink.Note that the
ActorSystemcan be used as the implicitmaterializerparameter to use the akka.stream.SystemMaterializer for running the stream. - final def shape: SourceShape[(Out, Ctx)]
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
- def sliding(n: Int, step: Int = 1): Repr[Seq[Out], Seq[Ctx]]
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
Seqof corresponding context elements.- Definition Classes
- FlowWithContextOps
- See also
- def throttle(cost: Int, per: FiniteDuration, maximumBurst: Int, costCalculation: (Out) => Int, mode: ThrottleMode): Repr[Out, Ctx]
Context-preserving variant of akka.stream.scaladsl.FlowOps.throttle.
Context-preserving variant of akka.stream.scaladsl.FlowOps.throttle.
- Definition Classes
- FlowWithContextOps
- See also
- def throttle(cost: Int, per: FiniteDuration, costCalculation: (Out) => Int): Repr[Out, Ctx]
Context-preserving variant of akka.stream.scaladsl.FlowOps.throttle.
Context-preserving variant of akka.stream.scaladsl.FlowOps.throttle.
- Definition Classes
- FlowWithContextOps
- See also
- def throttle(elements: Int, per: FiniteDuration, maximumBurst: Int, mode: ThrottleMode): Repr[Out, Ctx]
Context-preserving variant of akka.stream.scaladsl.FlowOps.throttle.
Context-preserving variant of akka.stream.scaladsl.FlowOps.throttle.
- Definition Classes
- FlowWithContextOps
- See also
- def throttle(elements: Int, per: FiniteDuration): Repr[Out, Ctx]
Context-preserving variant of akka.stream.scaladsl.FlowOps.throttle.
Context-preserving variant of akka.stream.scaladsl.FlowOps.throttle.
- Definition Classes
- FlowWithContextOps
- See also
- def to[Mat2](sink: Graph[SinkShape[(Out, Ctx)], Mat2]): RunnableGraph[Mat]
Connect this akka.stream.scaladsl.SourceWithContext to a akka.stream.scaladsl.Sink, concatenating the processing steps of both.
- def toMat[Mat2, Mat3](sink: Graph[SinkShape[(Out, Ctx)], Mat2])(combine: (Mat, Mat2) => Mat3): RunnableGraph[Mat3]
Connect this akka.stream.scaladsl.SourceWithContext to a akka.stream.scaladsl.Sink, concatenating the processing steps of both.
- def unsafeDataVia[Out2, Mat2](viaFlow: Graph[FlowShape[Out, Out2], Mat2]): Repr[Out2, Ctx]
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
- SourceWithContext → FlowWithContextOps
- def via[Out2, Ctx2, Mat2](viaFlow: Graph[FlowShape[(Out, Ctx), (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
- SourceWithContext → FlowWithContextOps
- See also
- def viaMat[Out2, Ctx2, Mat2, Mat3](flow: Graph[FlowShape[(Out, Ctx), (Out2, Ctx2)], Mat2])(combine: (Mat, Mat2) => Mat3): SourceWithContext[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
combinefunction is used to compose the materialized values of this flow and that flow into the materialized value of the resulting Flow.- Definition Classes
- SourceWithContext → FlowWithContextOps
- See also
- def withAttributes(attr: Attributes): SourceWithContext[Out, Ctx, Mat]
Context-preserving variant of akka.stream.scaladsl.Source.withAttributes.
Context-preserving variant of akka.stream.scaladsl.Source.withAttributes.
- Definition Classes
- SourceWithContext → Graph
- See also
Shadowed Implicit Value Members
- def mapMaterializedValue[M2](f: (Mat) => M2): Graph[SourceShape[(Out, Ctx)], 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 SourceWithContext[Out, Ctx, Mat] toGraphMapMatVal[SourceShape[(Out, Ctx)], 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:(sourceWithContext: GraphMapMatVal[SourceShape[(Out, Ctx)], Mat]).mapMaterializedValue(f)
- Definition Classes
- GraphMapMatVal