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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 combinator.

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.

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ZipWithN[A, O]ZipN[A]ZipWithApplyZipWithZipWith2[A1, A2, O]Zip[A, B]UnzipWithApplyUnzipWithUnzipWith2[In, A1, A2]Unzip[A, B]SubFlow[Out, Mat, F, C]SourceQueueWithComplete[T]SourceQueue[T]Source[Out, Mat]SinkQueueWithCancel[T]SinkQueue[T]GraphDSLGraphApplyFlowOpsMat[Out, Mat]Flow[In, Out, Mat]FlowOps[Out, Mat]
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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 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 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 0 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

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

  12. 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

  13. 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 when all downstreams cancel

  14. final case class RunnableGraph [+Mat](module: Module) extends Graph[ClosedShape, Mat] with Product with Serializable

    Flow with attached input and output, can be executed.

  15. trait ScalaSessionAPI extends AnyRef

    Allows access to an SSLSession with Scala types

  16. 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

  17. 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.

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

    This trait adds cancel support to SinkQueue.

  19. implicit final class SinkToCompletionStage [In, T] extends AnyVal
  20. 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).

  21. trait SourceQueue [T] extends AnyRef

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

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

    This trait adds completion support to SourceQueue.

  23. implicit final class SourceToCompletionStage [Out, T] extends AnyVal
  24. 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.

  25. final class Tcp extends Extension
  26. final class TcpIdleTimeoutException extends TimeoutException
  27. final class Unzip [A, B] extends UnzipWith2[(A, B), A, B]

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

  28. 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

  29. 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

  30. 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

  31. 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

  32. 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

  33. 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

  34. 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

  35. 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

  36. 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

  37. 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

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

    UnzipWith specialized for 2 outputs

  39. 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

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

    UnzipWith specialized for 3 outputs

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

    UnzipWith specialized for 4 outputs

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

    UnzipWith specialized for 5 outputs

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

    UnzipWith specialized for 6 outputs

  44. 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

  45. 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

  46. 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

  47. trait UnzipWithApply extends AnyRef
  48. 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

  49. 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

  50. 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

  51. 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

  52. 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

  53. 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

  54. 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

  55. 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

  56. 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

  57. 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

  58. 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

  59. 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

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

    ZipWith specialized for 2 inputs

  61. 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

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

    ZipWith specialized for 3 inputs

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

    ZipWith specialized for 4 inputs

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

    ZipWith specialized for 5 inputs

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

    ZipWith specialized for 6 inputs

  66. 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

  67. 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

  68. 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

  69. trait ZipWithApply extends AnyRef
  70. 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 consissts 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 arbitrary many times, where weach 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 stages.

  8. object FileIO

    Java API: Factories to create sinks and sources from files

  9. object Flow
  10. object Framing
  11. object GraphApply

    INTERNAL API

  12. object GraphDSL extends GraphApply
  13. object Interleave
  14. object JsonFraming

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

  15. object Keep

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

  16. object Merge
  17. 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.

  18. object MergePreferred
  19. object ModuleExtractor

    INTERNAL API

  20. object OrElse
  21. object Partition
  22. object RunnableGraph extends Serializable
  23. object ScalaSessionAPI
  24. object Sink
  25. object Source
  26. object StreamConverters

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

  27. 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 stage 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 stage 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 stage will shut down once both events have been received. See also TLSClosing.

  28. 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.

  29. object Tcp extends ExtensionId[Tcp] with ExtensionIdProvider
  30. 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 stops backpressuring and there is an input element available

    Backpressures when any of the outputs backpressures

    Completes when upstream completes

    Cancels when any downstream cancels

  31. 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 stops backpressuring and there is an input element available

    Backpressures when any of the outputs backpressures

    Completes when upstream completes

    Cancels when any downstream cancels

  32. object UnzipWithApply
  33. object Zip
  34. object ZipN
  35. 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

  36. object ZipWithN

Inherited from AnyRef

Inherited from Any

Ungrouped