o

akka.stream.javadsl

MergeSequence

object MergeSequence

Takes multiple streams whose elements in aggregate have a defined linear sequence with difference 1, starting at 0, and outputs a single stream containing these elements, in order. That is, given a set of input streams with combined elements *ek*:

*e0*, *e1*, *e2*, ..., *en*

This will output a stream ordered by *k*.

The elements in the input streams must already be sorted according to the sequence. The input streams do not need to be linear, but the aggregate stream must be linear, no element *k* may be skipped or duplicated, either of these conditions will cause the stream to fail.

The typical use case for this is to merge a partitioned stream back together while maintaining order. This can be achieved by first using zipWithIndex on the input stream, then partitioning using a Partition fanout, and then maintaining the index through the processing of each partition before bringing together with this stage.

Emits when one of the upstreams has the next expected element in the sequence available.

Backpressures when downstream backpressures

Completes when all upstreams complete

Cancels when downstream cancels

Source
Graph.scala
Linear Supertypes
AnyRef, Any
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Visibility
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Value Members

  1. def create[T](clazz: Class[T], inputCount: Int, extractSequence: Function[T, Long]): Graph[UniformFanInShape[T, T], NotUsed]

    Create a new anonymous Concat operator with the specified input types.

    Create a new anonymous Concat operator with the specified input types.

    clazz

    a type hint for this method

    inputCount

    The number of input streams.

    extractSequence

    The function to extract the sequence from an element.

  2. def create[T](inputCount: Int, extractSequence: Function[T, Long]): Graph[UniformFanInShape[T, T], NotUsed]

    Create a new anonymous MergeSequence operator.

    Create a new anonymous MergeSequence operator.

    inputCount

    The number of input streams.

    extractSequence

    The function to extract the sequence from an element.

  3. def create[T](extractSequence: Function[T, Long]): Graph[UniformFanInShape[T, T], NotUsed]

    Create a new anonymous MergeSequence operator with two input ports.

    Create a new anonymous MergeSequence operator with two input ports.

    extractSequence

    The function to extract the sequence from an element.