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).
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
- Source
- Graph.scala
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- MergePreferred
- GraphStage
- GraphStageWithMaterializedValue
- Graph
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- Public
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Type Members
-
type
Shape = MergePreferredShape[T]
Type-level accessor for the shape parameter of this graph.
Type-level accessor for the shape parameter of this graph.
- Definition Classes
- Graph
Value Members
-
def
addAttributes(attr: Attributes): Graph[MergePreferredShape[T], NotUsed]
Add the given attributes to this Graph.
Add the given attributes to this Graph. If the specific attribute was already present on this graph this means the added attribute will be more specific than the existing one. If this Source is a composite of multiple graphs, new attributes on the composite will be less specific than attributes set directly on the individual graphs of the composite.
- Definition Classes
- Graph
-
def
async(dispatcher: String, inputBufferSize: Int): Graph[MergePreferredShape[T], NotUsed]
Put an asynchronous boundary around this
GraphPut an asynchronous boundary around this
Graph- dispatcher
Run the graph on this dispatcher
- inputBufferSize
Set the input buffer to this size for the graph
- Definition Classes
- Graph
-
def
async(dispatcher: String): Graph[MergePreferredShape[T], NotUsed]
Put an asynchronous boundary around this
GraphPut an asynchronous boundary around this
Graph- dispatcher
Run the graph on this dispatcher
- Definition Classes
- Graph
-
def
async: Graph[MergePreferredShape[T], NotUsed]
Put an asynchronous boundary around this
GraphPut an asynchronous boundary around this
Graph- Definition Classes
- Graph
-
def
createLogic(inheritedAttributes: Attributes): GraphStageLogic
- Definition Classes
- MergePreferred → GraphStage
-
final
def
createLogicAndMaterializedValue(inheritedAttributes: Attributes): (GraphStageLogic, NotUsed)
- Definition Classes
- GraphStage → GraphStageWithMaterializedValue
- val eagerComplete: Boolean
- def in(id: Int): Inlet[T]
-
def
initialAttributes: Attributes
- Definition Classes
- MergePreferred → GraphStageWithMaterializedValue
-
def
named(name: String): Graph[MergePreferredShape[T], NotUsed]
- Definition Classes
- Graph
- def out: Outlet[T]
- def preferred: Inlet[T]
- val secondaryPorts: Int
-
val
shape: MergePreferredShape[T]
The shape of a graph is all that is externally visible: its inlets and outlets.
The shape of a graph is all that is externally visible: its inlets and outlets.
- Definition Classes
- MergePreferred → Graph
-
final
def
withAttributes(attr: Attributes): Graph[MergePreferredShape[T], NotUsed]
- Definition Classes
- GraphStageWithMaterializedValue → Graph