Class OrElse<T>

Takes two streams and passes the first through, the secondary stream is only passed through if the primary stream completes without passing any elements through. When the first element is passed through from the primary the secondary is cancelled. Both incoming streams are materialized when the stage is materialized.

On errors the stage is failed regardless of source of the error.

'''Emits when''' element is available from primary stream or the primary stream closed without emitting any elements and an element is available from the secondary stream

'''Backpressures when''' downstream backpressures

'''Completes when''' the primary stream completes after emitting at least one element, when the primary stream completes without emitting and the secondary stream already has completed or when the secondary stream completes

'''Cancels when''' downstream cancels

Inheritance
Object
GraphStageWithMaterializedValue<UniformFanInShape<T, T>, NotUsed>
GraphStage<UniformFanInShape<T, T>>
OrElse<T>
Implements
Inherited Members
Namespace: Akka.Streams.Dsl
Assembly: Akka.Streams.dll
Syntax
public sealed class OrElse<T> : GraphStage<UniformFanInShape<T, T>>, IGraphStageWithMaterializedValue<UniformFanInShape<T, T>, NotUsed>, IGraph<UniformFanInShape<T, T>, NotUsed>, IGraph<UniformFanInShape<T, T>>
Type Parameters
Name Description
T

TBD

Constructors

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OrElse()

Initializes a new instance of the OrElse<T> class.

Declaration
public OrElse()

Properties

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InitialAttributes

TBD

Declaration
protected override Attributes InitialAttributes { get; }
Property Value
Type Description
Attributes
Overrides
Akka.Streams.Stage.GraphStageWithMaterializedValue<Akka.Streams.UniformFanInShape<T, T>, Akka.NotUsed>.InitialAttributes
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Out

TBD

Declaration
public Outlet<T> Out { get; }
Property Value
Type Description
Outlet<T>
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Primary

TBD

Declaration
public Inlet<T> Primary { get; }
Property Value
Type Description
Inlet<T>
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Secondary

TBD

Declaration
public Inlet<T> Secondary { get; }
Property Value
Type Description
Inlet<T>
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Shape

TBD

Declaration
public override UniformFanInShape<T, T> Shape { get; }
Property Value
Type Description
UniformFanInShape<T, T>
Overrides
Akka.Streams.Stage.GraphStageWithMaterializedValue<Akka.Streams.UniformFanInShape<T, T>, Akka.NotUsed>.Shape

Methods

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CreateLogic(Attributes)

TBD

Declaration
protected override GraphStageLogic CreateLogic(Attributes inheritedAttributes)
Parameters
Type Name Description
Attributes inheritedAttributes

TBD
Returns
Type Description
GraphStageLogic

TBD
Overrides
Akka.Streams.Stage.GraphStage<Akka.Streams.UniformFanInShape<T, T>>.CreateLogic(Akka.Streams.Attributes)
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ToString()

TBD

Declaration
public override string ToString()
Returns
Type Description
String

TBD
Overrides

Implements

Extension Methods