GraphStageWithMaterializedValue

java.lang.Object
- akka.stream.stage.GraphStageWithMaterializedValue<S,M>

All Implemented Interfaces:

Graph<S,M>

Direct Known Subclasses:

AbstractGraphStageWithMaterializedValue, GraphStage, KillSwitches.UniqueBidiKillSwitchStage$, KillSwitches.UniqueKillSwitchStage$
```
public abstract class GraphStageWithMaterializedValue<S extends Shape,M>
extends java.lang.Object
implements Graph<S,M>
```
Scala API: A GraphStage represents a reusable graph stream processing operator.
Extend this GraphStageWithMaterializedValue if you want to provide a materialized value, represented by the type parameter M. If your GraphStage does not need to provide a materialized value you can instead extende GraphStage which materializes a NotUsed value.
A GraphStage consists of a Shape which describes its input and output ports and a factory function that creates a GraphStageLogic which implements the processing logic that ties the ports together.
See also AbstractGraphStageWithMaterializedValue for Java DSL for this operator.

Nested Class Summary
- Nested classes/interfaces inherited from interface akka.stream.Graph
  Graph.GraphMapMatVal<S extends Shape,M>

Constructor Summary

Constructors
Constructor Description

GraphStageWithMaterializedValue()

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`abstract scala.Tuple2<GraphStageLogic,M>`	`createLogicAndMaterializedValue(Attributes inheritedAttributes)`
`protected Attributes`	`initialAttributes()`
`Graph<S,M>`	`withAttributes(Attributes attr)`	Replace the attributes of this `Flow` with the given ones.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface akka.stream.Graph
addAttributes, async, async, async, getAttributes, named, shape

- Constructor Detail
  - GraphStageWithMaterializedValue
```
public GraphStageWithMaterializedValue()
```
- Method Detail
  - createLogicAndMaterializedValue
```
public abstract scala.Tuple2<GraphStageLogic,M> createLogicAndMaterializedValue(Attributes inheritedAttributes)
                                                                               throws java.lang.Exception
```
    Throws:
    
    java.lang.Exception
  - initialAttributes
```
protected Attributes initialAttributes()
```
  - withAttributes
```
public final Graph<S,M> withAttributes(Attributes attr)
```
    Description copied from interface: Graph
    
    Replace the attributes of this Flow with the given ones. If this Flow 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.
    
    Specified by:
    
    withAttributes in interface Graph<S extends Shape,M>