Class Fusing

This class holds some graph transformation functions that can fuse together multiple operation stages into synchronous execution islands. The purpose is to reduce the number of Actors that are created in order to execute the stream and thereby improve start-up cost as well as reduce element traversal latency for large graphs. Fusing itself is a time-consuming operation, meaning that usually it is best to cache the result of this computation and reuse it instead of fusing the same graph many times.

Fusing together all operations which allow this treatment will reduce the parallelism that is available in the stream graph’s execution—in the worst case it will become single-threaded and not benefit from multiple CPU cores at all. Where parallelism is required, the Attributes.AsyncBoundary attribute can be used to declare subgraph boundaries across which the graph shall not be fused.

Inheritance

object

Fusing

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object, object)

object.ToString()

Namespace: Akka.Streams

Assembly: Akka.Streams.dll

Syntax

public static class Fusing

Methods

Aggressive<TShape, TMat>(IGraph<TShape, TMat>)

Fuse all operations where this is technically possible (i.e. all implementations based on GraphStage<TShape>) and not forbidden via Attributes.AsyncBoundary

Declaration

public static Fusing.FusedGraph<TShape, TMat> Aggressive<TShape, TMat>(IGraph<TShape, TMat> graph) where TShape : Shape

Parameters

Type	Name	Description
IGraph<TShape, TMat>	graph	TBD

Returns

Type	Description
Fusing.FusedGraph<TShape, TMat>	TBD

Type Parameters

Name	Description
TShape	TBD
TMat	TBD

StructuralInfo<TShape, TMat>(IGraph<TShape, TMat>, Attributes)

Return the StructuralInfo for this Graph without any fusing

Declaration

public static StructuralInfoModule StructuralInfo<TShape, TMat>(IGraph<TShape, TMat> graph, Attributes attributes) where TShape : Shape

Parameters

Type	Name	Description
IGraph<TShape, TMat>	graph
Attributes	attributes

Returns

Type	Description
StructuralInfoModule

Type Parameters

Name	Description
TShape
TMat