Packages

p

akka.stream

scaladsl

package scaladsl

Scala API: The flow DSL allows the formulation of stream transformations based on some input. The starting point is called Source and can be a collection, an iterator, a block of code which is evaluated repeatedly or a org.reactivestreams.Publisher. A flow with an attached input and open output is also a Source.

A flow may also be defined without an attached input or output and that is then a Flow. The Flow can be connected to the Source later by using Source#via with the flow as argument, and it remains a Source.

Transformations can be appended to Source and Flow with the operations defined in FlowOps. Each DSL element produces a new flow that can be further transformed, building up a description of the complete transformation pipeline.

The termination point of a flow is called Sink and can for example be a Future or org.reactivestreams.Subscriber. A flow with an attached output and open input is also a Sink.

If a flow has both an attached input and an attached output it becomes a RunnableGraph. In order to execute this pipeline the flow must be materialized by calling RunnableGraph#run on it.

You can create your Source, Flow and Sink in any order and then wire them together before they are materialized by connecting them using Flow#via and Flow#to, or connecting them into a GraphDSL with fan-in and fan-out elements.

See Reactive Streams for details on org.reactivestreams.Publisher and org.reactivestreams.Subscriber.

It should be noted that the streams modeled by this library are “hot”, meaning that they asynchronously flow through a series of processors without detailed control by the user. In particular it is not predictable how many elements a given transformation step might buffer before handing elements downstream, which means that transformation functions may be invoked more often than for corresponding transformations on strict collections like List. *An important consequence* is that elements that were produced into a stream may be discarded by later processors, e.g. when using the #take operator.

By default every operation is executed within its own akka.actor.Actor to enable full pipelining of the chained set of computations. This behavior is determined by the akka.stream.Materializer which is required by those methods that materialize the Flow into a series of org.reactivestreams.Processor instances. The returned reactive stream is fully started and active.

Source
package.scala
Linear Supertypes
Ordering
  1. Alphabetic
  2. By Inheritance
Inherited
  1. scaladsl
  2. AnyRef
  3. Any
  1. Hide All
  2. Show All
Visibility
  1. Public
  2. All

Type Members

  1. final class Balance[T] extends GraphStage[UniformFanOutShape[T, T]]

    Fan-out the stream to several streams.

    Fan-out the stream to several streams. Each upstream element is emitted to the first available downstream consumer. It will not shut down until the subscriptions for at least two downstream subscribers have been established.

    A Balance has one in port and 2 or more out ports.

    Emits when any of the outputs stops backpressuring; emits the element to the first available output

    Backpressures when all of the outputs backpressure

    Completes when upstream completes

    Cancels when If eagerCancel is enabled: when any downstream cancels; otherwise: when all downstreams cancel

  2. final class BidiFlow[-I1, +O1, -I2, +O2, +Mat] extends Graph[BidiShape[I1, O1, I2, O2], Mat]
  3. final class Broadcast[T] extends GraphStage[UniformFanOutShape[T, T]]

    Fan-out the stream to several streams emitting each incoming upstream element to all downstream consumers.

    Fan-out the stream to several streams emitting each incoming upstream element to all downstream consumers. It will not shut down until the subscriptions for at least two downstream subscribers have been established.

    Emits when all of the outputs stops backpressuring and there is an input element available

    Backpressures when any of the outputs backpressure

    Completes when upstream completes

    Cancels when If eagerCancel is enabled: when any downstream cancels; otherwise: when all downstreams cancel

  4. final class Concat[T] extends GraphStage[UniformFanInShape[T, T]]

    Takes multiple streams and outputs one stream formed from the input streams by first emitting all of the elements from the first stream and then emitting all of the elements from the second stream, etc.

    Takes multiple streams and outputs one stream formed from the input streams by first emitting all of the elements from the first stream and then emitting all of the elements from the second stream, etc.

    A Concat has one first port, one second port and one out port.

    Emits when the current stream has an element available; if the current input completes, it tries the next one

    Backpressures when downstream backpressures

    Completes when all upstreams complete

    Cancels when downstream cancels

  5. final class Flow[-In, +Out, +Mat] extends FlowOpsMat[Out, Mat] with Graph[FlowShape[In, Out], Mat]

    A Flow is a set of stream processing steps that has one open input and one open output.

  6. trait FlowOps[+Out, +Mat] extends AnyRef

    Scala API: Operations offered by Sources and Flows with a free output side: the DSL flows left-to-right only.

    Scala API: Operations offered by Sources and Flows with a free output side: the DSL flows left-to-right only.

    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.

    Annotations
    @DoNotInherit()
  7. trait FlowOpsMat[+Out, +Mat] extends FlowOps[Out, Mat]

    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!

    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.

  8. trait GraphApply extends AnyRef
  9. final class Interleave[T] extends GraphStage[UniformFanInShape[T, T]]

    Interleave represents deterministic merge which takes N elements per input stream, in-order of inputs, emits them downstream and then cycles/"wraps-around" the inputs.

    Interleave represents deterministic merge which takes N elements per input stream, in-order of inputs, emits them downstream and then cycles/"wraps-around" the inputs.

    Emits when element is available from current input (depending on phase)

    Backpressures when downstream backpressures

    Completes when all upstreams complete (eagerClose=false) or one upstream completes (eagerClose=true)

    Cancels when downstream cancels

  10. final class Merge[T] extends GraphStage[UniformFanInShape[T, T]]

    Merge several streams, taking elements as they arrive from input streams (picking randomly when several have elements ready).

    Merge several streams, taking elements as they arrive from input streams (picking randomly when several have elements ready).

    Emits when one of the inputs has an element available

    Backpressures when downstream backpressures

    Completes when all upstreams complete (eagerComplete=false) or one upstream completes (eagerComplete=true), default value is false

    Cancels when downstream cancels

  11. final class MergeLatest[T, M] extends GraphStage[UniformFanInShape[T, M]]
  12. final class MergePreferred[T] extends GraphStage[MergePreferredShape[T]]

    Merge several streams, taking elements as they arrive from input streams (picking from preferred when several have elements ready).

    Merge several streams, taking elements as they arrive from input streams (picking from preferred when several have elements ready).

    A MergePreferred has one out port, one preferred input port and 1 or more secondary in ports.

    Emits when one of the inputs has an element available, preferring a specified input if multiple have elements available

    Backpressures when downstream backpressures

    Completes when all upstreams complete (eagerComplete=false) or one upstream completes (eagerComplete=true), default value is false

    Cancels when downstream cancels

  13. final class MergePrioritized[T] extends GraphStage[UniformFanInShape[T, T]]

    Merge several streams, taking elements as they arrive from input streams (picking from prioritized once when several have elements ready).

    Merge several streams, taking elements as they arrive from input streams (picking from prioritized once when several have elements ready).

    A MergePrioritized has one out port, one or more input port with their priorities.

    Emits when one of the inputs has an element available, preferring a input based on its priority if multiple have elements available

    Backpressures when downstream backpressures

    Completes when all upstreams complete (eagerComplete=false) or one upstream completes (eagerComplete=true), default value is false

    Cancels when downstream cancels

  14. final class MergeSorted[T] extends GraphStage[FanInShape2[T, T, T]]

    Merge two pre-sorted streams such that the resulting stream is sorted.

    Merge two pre-sorted streams such that the resulting stream is sorted.

    Emits when both inputs have an element available

    Backpressures when downstream backpressures

    Completes when all upstreams complete

    Cancels when downstream cancels

  15. final class Partition[T] extends GraphStage[UniformFanOutShape[T, T]]

    Fan-out the stream to several streams.

    Fan-out the stream to several streams. emitting an incoming upstream element to one downstream consumer according to the partitioner function applied to the element

    Emits when emits when an element is available from the input and the chosen output has demand

    Backpressures when the currently chosen output back-pressures

    Completes when upstream completes and no output is pending

    Cancels when all downstreams have cancelled (eagerCancel=false) or one downstream cancels (eagerCancel=true)

  16. final case class RunnableGraph[+Mat](traversalBuilder: TraversalBuilder) extends Graph[ClosedShape, Mat] with Product with Serializable

    Flow with attached input and output, can be executed.

  17. trait ScalaSessionAPI extends AnyRef

    Allows access to an SSLSession with Scala types

  18. final class Sink[-In, +Mat] extends Graph[SinkShape[In], Mat]

    A Sink is a set of stream processing steps that has one open input.

    A Sink is a set of stream processing steps that has one open input. Can be used as a Subscriber

  19. trait SinkQueue[T] extends AnyRef

    Trait allows to have the queue as a sink for some stream.

    Trait allows to have the queue as a sink for some stream. "SinkQueue" pulls data from stream with backpressure mechanism.

  20. trait SinkQueueWithCancel[T] extends SinkQueue[T]

    This trait adds cancel support to SinkQueue.

  21. implicit final class SinkToCompletionStage[In, T] extends AnyVal
  22. final class Source[+Out, +Mat] extends FlowOpsMat[Out, Mat] with Graph[SourceShape[Out], Mat]

    A Source is a set of stream processing steps that has one open output.

    A Source is a set of stream processing steps that has one open output. It can comprise any number of internal sources and transformations that are wired together, or it can be an “atomic” source, e.g. from a collection or a file. Materialization turns a Source into a Reactive Streams Publisher (at least conceptually).

  23. trait SourceQueue[T] extends AnyRef

    This trait allows to have the queue as a data source for some stream.

  24. trait SourceQueueWithComplete[T] extends SourceQueue[T]

    This trait adds completion support to SourceQueue.

  25. implicit final class SourceToCompletionStage[Out, T] extends AnyVal
  26. trait SubFlow[+Out, +Mat, +F[+_], C] extends FlowOps[Out, Mat]

    A “stream of streams” sub-flow of data elements, e.g.

    A “stream of streams” sub-flow of data elements, e.g. produced by groupBy. SubFlows cannot contribute to the super-flow’s materialized value since they are materialized later, during the runtime of the flow graph processing.

  27. final class Tcp extends Extension
  28. final class TcpIdleTimeoutException extends TimeoutException with NoStackTrace
  29. final class Unzip[A, B] extends UnzipWith2[(A, B), A, B]

    Takes a stream of pair elements and splits each pair to two output streams.

    Takes a stream of pair elements and splits each pair to two output streams.

    An Unzip has one in port and one left and one right output port.

    Emits when all of the outputs stop backpressuring and there is an input element available

    Backpressures when any of the outputs backpressure

    Completes when upstream completes

    Cancels when any downstream cancels

  30. class UnzipWith10[In, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10] extends GraphStage[FanOutShape10[In, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10]]

    UnzipWith specialized for 10 outputs

  31. class UnzipWith11[In, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11] extends GraphStage[FanOutShape11[In, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11]]

    UnzipWith specialized for 11 outputs

  32. class UnzipWith12[In, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12] extends GraphStage[FanOutShape12[In, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12]]

    UnzipWith specialized for 12 outputs

  33. class UnzipWith13[In, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13] extends GraphStage[FanOutShape13[In, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13]]

    UnzipWith specialized for 13 outputs

  34. class UnzipWith14[In, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14] extends GraphStage[FanOutShape14[In, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14]]

    UnzipWith specialized for 14 outputs

  35. class UnzipWith15[In, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15] extends GraphStage[FanOutShape15[In, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15]]

    UnzipWith specialized for 15 outputs

  36. class UnzipWith16[In, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16] extends GraphStage[FanOutShape16[In, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16]]

    UnzipWith specialized for 16 outputs

  37. class UnzipWith17[In, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17] extends GraphStage[FanOutShape17[In, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17]]

    UnzipWith specialized for 17 outputs

  38. class UnzipWith18[In, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18] extends GraphStage[FanOutShape18[In, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18]]

    UnzipWith specialized for 18 outputs

  39. class UnzipWith19[In, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19] extends GraphStage[FanOutShape19[In, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19]]

    UnzipWith specialized for 19 outputs

  40. class UnzipWith2[In, A1, A2] extends GraphStage[FanOutShape2[In, A1, A2]]

    UnzipWith specialized for 2 outputs

  41. class UnzipWith20[In, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20] extends GraphStage[FanOutShape20[In, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20]]

    UnzipWith specialized for 20 outputs

  42. class UnzipWith21[In, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21] extends GraphStage[FanOutShape21[In, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21]]

    UnzipWith specialized for 21 outputs

  43. class UnzipWith22[In, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22] extends GraphStage[FanOutShape22[In, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22]]

    UnzipWith specialized for 22 outputs

  44. class UnzipWith3[In, A1, A2, A3] extends GraphStage[FanOutShape3[In, A1, A2, A3]]

    UnzipWith specialized for 3 outputs

  45. class UnzipWith4[In, A1, A2, A3, A4] extends GraphStage[FanOutShape4[In, A1, A2, A3, A4]]

    UnzipWith specialized for 4 outputs

  46. class UnzipWith5[In, A1, A2, A3, A4, A5] extends GraphStage[FanOutShape5[In, A1, A2, A3, A4, A5]]

    UnzipWith specialized for 5 outputs

  47. class UnzipWith6[In, A1, A2, A3, A4, A5, A6] extends GraphStage[FanOutShape6[In, A1, A2, A3, A4, A5, A6]]

    UnzipWith specialized for 6 outputs

  48. class UnzipWith7[In, A1, A2, A3, A4, A5, A6, A7] extends GraphStage[FanOutShape7[In, A1, A2, A3, A4, A5, A6, A7]]

    UnzipWith specialized for 7 outputs

  49. class UnzipWith8[In, A1, A2, A3, A4, A5, A6, A7, A8] extends GraphStage[FanOutShape8[In, A1, A2, A3, A4, A5, A6, A7, A8]]

    UnzipWith specialized for 8 outputs

  50. class UnzipWith9[In, A1, A2, A3, A4, A5, A6, A7, A8, A9] extends GraphStage[FanOutShape9[In, A1, A2, A3, A4, A5, A6, A7, A8, A9]]

    UnzipWith specialized for 9 outputs

  51. trait UnzipWithApply extends AnyRef
  52. final class Zip[A, B] extends ZipWith2[A, B, (A, B)]

    Combine the elements of 2 streams into a stream of tuples.

    Combine the elements of 2 streams into a stream of tuples.

    A Zip has a left and a right input port and one out port

    Emits when all of the inputs has an element available

    Backpressures when downstream backpressures

    Completes when any upstream completes

    Cancels when downstream cancels

  53. final class ZipLatest[A, B] extends ZipLatestWith2[A, B, (A, B)]

    Combine the elements of 2 streams into a stream of tuples, picking always the latest element of each.

    Combine the elements of 2 streams into a stream of tuples, picking always the latest element of each.

    A ZipLatest has a left and a right input port and one out port.

    No element is emitted until at least one element from each Source becomes available.

    Emits when all of the inputs have at least an element available, and then each time an element becomes * available on either of the inputs

    Backpressures when downstream backpressures

    Completes when any upstream completes

    Cancels when downstream cancels

  54. class ZipLatestWith10[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, O] extends GraphStage[FanInShape10[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, O]]

    ZipLatestWith specialized for 10 inputs

  55. class ZipLatestWith11[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, O] extends GraphStage[FanInShape11[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, O]]

    ZipLatestWith specialized for 11 inputs

  56. class ZipLatestWith12[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, O] extends GraphStage[FanInShape12[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, O]]

    ZipLatestWith specialized for 12 inputs

  57. class ZipLatestWith13[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, O] extends GraphStage[FanInShape13[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, O]]

    ZipLatestWith specialized for 13 inputs

  58. class ZipLatestWith14[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, O] extends GraphStage[FanInShape14[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, O]]

    ZipLatestWith specialized for 14 inputs

  59. class ZipLatestWith15[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, O] extends GraphStage[FanInShape15[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, O]]

    ZipLatestWith specialized for 15 inputs

  60. class ZipLatestWith16[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, O] extends GraphStage[FanInShape16[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, O]]

    ZipLatestWith specialized for 16 inputs

  61. class ZipLatestWith17[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, O] extends GraphStage[FanInShape17[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, O]]

    ZipLatestWith specialized for 17 inputs

  62. class ZipLatestWith18[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, O] extends GraphStage[FanInShape18[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, O]]

    ZipLatestWith specialized for 18 inputs

  63. class ZipLatestWith19[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, O] extends GraphStage[FanInShape19[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, O]]

    ZipLatestWith specialized for 19 inputs

  64. class ZipLatestWith2[A1, A2, O] extends GraphStage[FanInShape2[A1, A2, O]]

    ZipLatestWith specialized for 2 inputs

  65. class ZipLatestWith20[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, O] extends GraphStage[FanInShape20[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, O]]

    ZipLatestWith specialized for 20 inputs

  66. class ZipLatestWith21[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, O] extends GraphStage[FanInShape21[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, O]]

    ZipLatestWith specialized for 21 inputs

  67. class ZipLatestWith22[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, O] extends GraphStage[FanInShape22[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, O]]

    ZipLatestWith specialized for 22 inputs

  68. class ZipLatestWith3[A1, A2, A3, O] extends GraphStage[FanInShape3[A1, A2, A3, O]]

    ZipLatestWith specialized for 3 inputs

  69. class ZipLatestWith4[A1, A2, A3, A4, O] extends GraphStage[FanInShape4[A1, A2, A3, A4, O]]

    ZipLatestWith specialized for 4 inputs

  70. class ZipLatestWith5[A1, A2, A3, A4, A5, O] extends GraphStage[FanInShape5[A1, A2, A3, A4, A5, O]]

    ZipLatestWith specialized for 5 inputs

  71. class ZipLatestWith6[A1, A2, A3, A4, A5, A6, O] extends GraphStage[FanInShape6[A1, A2, A3, A4, A5, A6, O]]

    ZipLatestWith specialized for 6 inputs

  72. class ZipLatestWith7[A1, A2, A3, A4, A5, A6, A7, O] extends GraphStage[FanInShape7[A1, A2, A3, A4, A5, A6, A7, O]]

    ZipLatestWith specialized for 7 inputs

  73. class ZipLatestWith8[A1, A2, A3, A4, A5, A6, A7, A8, O] extends GraphStage[FanInShape8[A1, A2, A3, A4, A5, A6, A7, A8, O]]

    ZipLatestWith specialized for 8 inputs

  74. class ZipLatestWith9[A1, A2, A3, A4, A5, A6, A7, A8, A9, O] extends GraphStage[FanInShape9[A1, A2, A3, A4, A5, A6, A7, A8, A9, O]]

    ZipLatestWith specialized for 9 inputs

  75. trait ZipLatestWithApply extends AnyRef
  76. final class ZipN[A] extends ZipWithN[A, Seq[A]]

    Combine the elements of multiple streams into a stream of sequences.

    Combine the elements of multiple streams into a stream of sequences.

    A ZipN has a n input ports and one out port

    Emits when all of the inputs has an element available

    Backpressures when downstream backpressures

    Completes when any upstream completes

    Cancels when downstream cancels

  77. class ZipWith10[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, O] extends GraphStage[FanInShape10[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, O]]

    ZipWith specialized for 10 inputs

  78. class ZipWith11[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, O] extends GraphStage[FanInShape11[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, O]]

    ZipWith specialized for 11 inputs

  79. class ZipWith12[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, O] extends GraphStage[FanInShape12[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, O]]

    ZipWith specialized for 12 inputs

  80. class ZipWith13[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, O] extends GraphStage[FanInShape13[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, O]]

    ZipWith specialized for 13 inputs

  81. class ZipWith14[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, O] extends GraphStage[FanInShape14[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, O]]

    ZipWith specialized for 14 inputs

  82. class ZipWith15[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, O] extends GraphStage[FanInShape15[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, O]]

    ZipWith specialized for 15 inputs

  83. class ZipWith16[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, O] extends GraphStage[FanInShape16[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, O]]

    ZipWith specialized for 16 inputs

  84. class ZipWith17[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, O] extends GraphStage[FanInShape17[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, O]]

    ZipWith specialized for 17 inputs

  85. class ZipWith18[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, O] extends GraphStage[FanInShape18[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, O]]

    ZipWith specialized for 18 inputs

  86. class ZipWith19[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, O] extends GraphStage[FanInShape19[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, O]]

    ZipWith specialized for 19 inputs

  87. class ZipWith2[A1, A2, O] extends GraphStage[FanInShape2[A1, A2, O]]

    ZipWith specialized for 2 inputs

  88. class ZipWith20[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, O] extends GraphStage[FanInShape20[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, O]]

    ZipWith specialized for 20 inputs

  89. class ZipWith21[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, O] extends GraphStage[FanInShape21[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, O]]

    ZipWith specialized for 21 inputs

  90. class ZipWith22[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, O] extends GraphStage[FanInShape22[A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, O]]

    ZipWith specialized for 22 inputs

  91. class ZipWith3[A1, A2, A3, O] extends GraphStage[FanInShape3[A1, A2, A3, O]]

    ZipWith specialized for 3 inputs

  92. class ZipWith4[A1, A2, A3, A4, O] extends GraphStage[FanInShape4[A1, A2, A3, A4, O]]

    ZipWith specialized for 4 inputs

  93. class ZipWith5[A1, A2, A3, A4, A5, O] extends GraphStage[FanInShape5[A1, A2, A3, A4, A5, O]]

    ZipWith specialized for 5 inputs

  94. class ZipWith6[A1, A2, A3, A4, A5, A6, O] extends GraphStage[FanInShape6[A1, A2, A3, A4, A5, A6, O]]

    ZipWith specialized for 6 inputs

  95. class ZipWith7[A1, A2, A3, A4, A5, A6, A7, O] extends GraphStage[FanInShape7[A1, A2, A3, A4, A5, A6, A7, O]]

    ZipWith specialized for 7 inputs

  96. class ZipWith8[A1, A2, A3, A4, A5, A6, A7, A8, O] extends GraphStage[FanInShape8[A1, A2, A3, A4, A5, A6, A7, A8, O]]

    ZipWith specialized for 8 inputs

  97. class ZipWith9[A1, A2, A3, A4, A5, A6, A7, A8, A9, O] extends GraphStage[FanInShape9[A1, A2, A3, A4, A5, A6, A7, A8, A9, O]]

    ZipWith specialized for 9 inputs

  98. trait ZipWithApply extends AnyRef
  99. class ZipWithN[A, O] extends GraphStage[UniformFanInShape[A, O]]

    Combine the elements of multiple streams into a stream of sequences using a combiner function.

    Combine the elements of multiple streams into a stream of sequences using a combiner function.

    A ZipWithN has a n input ports and one out port

    Emits when all of the inputs has an element available

    Backpressures when downstream backpressures

    Completes when any upstream completes

    Cancels when downstream cancels

Value Members

  1. object Balance
  2. object BidiFlow
  3. object Broadcast
  4. object BroadcastHub

    A BroadcastHub is a special streaming hub that is able to broadcast streamed elements to a dynamic set of consumers.

    A BroadcastHub is a special streaming hub that is able to broadcast streamed elements to a dynamic set of consumers. It consists of two parts, a Sink and a Source. The Sink broadcasts elements from a producer to the actually live consumers it has. Once the producer has been materialized, the Sink it feeds into returns a materialized value which is the corresponding Source. This Source can be materialized an arbitrary number of times, where each of the new materializations will receive their elements from the original Sink.

  5. object Compression
  6. object Concat
  7. object CoupledTerminationFlow

    Allows coupling termination (cancellation, completion, erroring) of Sinks and Sources while creating a Flow them them.

    Allows coupling termination (cancellation, completion, erroring) of Sinks and Sources while creating a Flow them them. Similar to Flow.fromSinkAndSource however that API does not connect the completion signals of the wrapped operators.

  8. object FileIO

    Factories to create sinks and sources from files

  9. object Flow
  10. object Framing
  11. object GraphDSL extends GraphApply
  12. object Interleave
  13. object JsonFraming

    Provides JSON framing operators that can separate valid JSON objects from incoming ByteString objects.

  14. object Keep

    Convenience functions for often-encountered purposes like keeping only the left (first) or only the right (second) of two input values.

  15. object Merge
  16. object MergeHub

    A MergeHub is a special streaming hub that is able to collect streamed elements from a dynamic set of producers.

    A MergeHub is a special streaming hub that is able to collect streamed elements from a dynamic set of producers. It consists of two parts, a Source and a Sink. The Source streams the element to a consumer from its merged inputs. Once the consumer has been materialized, the Source returns a materialized value which is the corresponding Sink. This Sink can then be materialized arbitrary many times, where each of the new materializations will feed its consumed elements to the original Source.

  17. object MergeLatest

    MergeLatest joins elements from N input streams into stream of lists of size N.

    MergeLatest joins elements from N input streams into stream of lists of size N. i-th element in list is the latest emitted element from i-th input stream. MergeLatest emits list for each element emitted from some input stream, but only after each stream emitted at least one element

    Emits when element is available from some input and each input emits at least one element from stream start

    Completes when all upstreams complete (eagerClose=false) or one upstream completes (eagerClose=true)

    Cancels when downstream cancels

  18. object MergePreferred
  19. object MergePrioritized
  20. object OrElse
  21. object Partition
  22. object PartitionHub

    A PartitionHub is a special streaming hub that is able to route streamed elements to a dynamic set of consumers.

    A PartitionHub is a special streaming hub that is able to route streamed elements to a dynamic set of consumers. It consists of two parts, a Sink and a Source. The Sink e elements from a producer to the actually live consumers it has. The selection of consumer is done with a function. Each element can be routed to only one consumer. Once the producer has been materialized, the Sink it feeds into returns a materialized value which is the corresponding Source. This Source can be materialized an arbitrary number of times, where each of the new materializations will receive their elements from the original Sink.

  23. object RestartFlow

    A RestartFlow wraps a Flow that gets restarted when it completes or fails.

    A RestartFlow wraps a Flow that gets restarted when it completes or fails.

    They are useful for graphs that need to run for longer than the Flow can necessarily guarantee it will, for example, for Flow streams that depend on a remote server that may crash or become partitioned. The RestartFlow ensures that the graph can continue running while the Flow restarts.

  24. object RestartSink

    A RestartSink wraps a Sink that gets restarted when it completes or fails.

    A RestartSink wraps a Sink that gets restarted when it completes or fails.

    They are useful for graphs that need to run for longer than the Sink can necessarily guarantee it will, for example, for Sink streams that depend on a remote server that may crash or become partitioned. The RestartSink ensures that the graph can continue running while the Sink restarts.

  25. object RestartSource

    A RestartSource wraps a Source that gets restarted when it completes or fails.

    A RestartSource wraps a Source that gets restarted when it completes or fails.

    They are useful for graphs that need to run for longer than the Source can necessarily guarantee it will, for example, for Source streams that depend on a remote server that may crash or become partitioned. The RestartSource ensures that the graph can continue running while the Source restarts.

  26. object RestartWithBackoffFlow
  27. object RunnableGraph extends Serializable
  28. object ScalaSessionAPI
  29. object Sink
  30. object Source
  31. object StreamConverters

    Converters for interacting with the blocking java.io streams APIs and Java 8 Streams

  32. object StreamRefs

    API MAY CHANGE: The functionality of stream refs is working, however it is expected that the materialized value will eventually be able to remove the Future wrapping the stream references.

    API MAY CHANGE: The functionality of stream refs is working, however it is expected that the materialized value will eventually be able to remove the Future wrapping the stream references. For this reason the API is now marked as API may change. See ticket https://github.com/akka/akka/issues/24372 for more details.

    Factories for creating stream refs.

    Annotations
    @ApiMayChange()
  33. object TLS

    Stream cipher support based upon JSSE.

    Stream cipher support based upon JSSE.

    The underlying SSLEngine has four ports: plaintext input/output and ciphertext input/output. These are modeled as a akka.stream.BidiShape element for use in stream topologies, where the plaintext ports are on the left hand side of the shape and the ciphertext ports on the right hand side.

    Configuring JSSE is a rather complex topic, please refer to the JDK platform documentation or the excellent user guide that is part of the Play Framework documentation. The philosophy of this integration into Akka Streams is to expose all knobs and dials to client code and therefore not limit the configuration possibilities. In particular the client code will have to provide the SSLContext from which the SSLEngine is then created. Handshake parameters are set using NegotiateNewSession messages, the settings for the initial handshake need to be provided up front using the same class; please refer to the method documentation below.

    IMPORTANT NOTE

    The TLS specification does not permit half-closing of the user data session that it transports—to be precise a half-close will always promptly lead to a full close. This means that canceling the plaintext output or completing the plaintext input of the SslTls operator will lead to full termination of the secure connection without regard to whether bytes are remaining to be sent or received, respectively. Especially for a client the common idiom of attaching a finite Source to the plaintext input and transforming the plaintext response bytes coming out will not work out of the box due to early termination of the connection. For this reason there is a parameter that determines whether the SslTls operator shall ignore completion and/or cancellation events, and the default is to ignore completion (in view of the client–server scenario). In order to terminate the connection the client will then need to cancel the plaintext output as soon as all expected bytes have been received. When ignoring both types of events the operator will shut down once both events have been received. See also TLSClosing.

  34. object TLSPlacebo

    This object holds simple wrapping akka.stream.scaladsl.BidiFlow implementations that can be used instead of TLS when no encryption is desired.

    This object holds simple wrapping akka.stream.scaladsl.BidiFlow implementations that can be used instead of TLS when no encryption is desired. The flows will just adapt the message protocol by wrapping into SessionBytes and unwrapping SendBytes.

  35. object Tcp extends ExtensionId[Tcp] with ExtensionIdProvider
  36. object Unzip

    Takes a stream of pair elements and splits each pair to two output streams.

    Takes a stream of pair elements and splits each pair to two output streams.

    An Unzip has one in port and one left and one right output port.

    Emits when all of the outputs stop backpressuring and there is an input element available

    Backpressures when any of the outputs backpressure

    Completes when upstream completes

    Cancels when any downstream cancels

  37. object UnzipWith extends UnzipWithApply

    Transforms each element of input stream into multiple streams using a splitter function.

    Transforms each element of input stream into multiple streams using a splitter function.

    Emits when all of the outputs stop backpressuring and there is an input element available

    Backpressures when any of the outputs backpressure

    Completes when upstream completes

    Cancels when any downstream cancels

  38. object UnzipWithApply
  39. object WireTap
  40. object Zip
  41. object ZipLatest
  42. object ZipLatestWith extends ZipLatestWithApply

    Combine the elements of multiple streams into a stream of combined elements using a combiner function, picking always the latest of the elements of each source.

    Combine the elements of multiple streams into a stream of combined elements using a combiner function, picking always the latest of the elements of each source.

    No element is emitted until at least one element from each Source becomes available. Whenever a new element appears, the zipping function is invoked with a tuple containing the new element and the other last seen elements.

    Emits when all of the inputs have at least an element available, and then each time an element becomes available on either of the inputs

    Backpressures when downstream backpressures

    Completes when any of the upstreams completes

    Cancels when downstream cancels

  43. object ZipN
  44. object ZipWith extends ZipWithApply

    Combine the elements of multiple streams into a stream of combined elements using a combiner function.

    Combine the elements of multiple streams into a stream of combined elements using a combiner function.

    Emits when all of the inputs has an element available

    Backpressures when downstream backpressures

    Completes when any upstream completes

    Cancels when downstream cancels

  45. object ZipWithN

Inherited from AnyRef

Inherited from Any

Ungrouped