WireTap

java.lang.Object
- akka.stream.stage.GraphStageWithMaterializedValue<S,NotUsed>
- - akka.stream.stage.GraphStage<FanOutShape2<T,T,T>>
  - - akka.stream.scaladsl.WireTap<T>

All Implemented Interfaces:

Graph<FanOutShape2<T,T,T>,NotUsed>
```
public final class WireTap<T>
extends GraphStage<FanOutShape2<T,T,T>>
```
Fan-out the stream to two output streams - a 'main' and a 'tap' one. Each incoming element is emitted to the 'main' output; elements are also emitted to the 'tap' output if there is demand; otherwise they are dropped.
'''Emits when''' element is available and demand exists from the 'main' output; the element will also be sent to the 'tap' output if there is demand.
'''Backpressures when''' the 'main' output backpressures
'''Completes when''' upstream completes
'''Cancels when''' the 'main' output cancels

Constructor Summary

Constructors
Constructor Description

WireTap()

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static <T> WireTap<T>`	`apply()`
`GraphStageLogic`	`createLogic(Attributes inheritedAttributes)`
`Inlet<T>`	`in()`
`Attributes`	`initialAttributes()`
`Outlet<T>`	`outMain()`
`Outlet<T>`	`outTap()`
`FanOutShape2<T,T,T>`	`shape()`	The shape of a graph is all that is externally visible: its inlets and outlets.
`java.lang.String`	`toString()`

Methods inherited from class akka.stream.stage.GraphStage
createLogicAndMaterializedValue

Methods inherited from class akka.stream.stage.GraphStageWithMaterializedValue
createLogicAndMaterializedValue, traversalBuilder, withAttributes

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

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

- Constructor Detail
  - WireTap
```
public WireTap()
```
- Method Detail
  - apply
```
public static <T> WireTap<T> apply()
```
    Returns:
    
    (undocumented)
    
    See Also:
    
    WireTap
  - in
```
public Inlet<T> in()
```
  - outMain
```
public Outlet<T> outMain()
```
  - outTap
```
public Outlet<T> outTap()
```
  - initialAttributes
```
public Attributes initialAttributes()
```
    Overrides:
    
    initialAttributes in class GraphStageWithMaterializedValue<FanOutShape2<T,T,T>,NotUsed>
  - shape
```
public FanOutShape2<T,T,T> shape()
```
    Description copied from interface: Graph
    
    The shape of a graph is all that is externally visible: its inlets and outlets.
    
    Returns:
    
    (undocumented)
  - createLogic
```
public GraphStageLogic createLogic(Attributes inheritedAttributes)
```
    Specified by:
    
    createLogic in class GraphStage<FanOutShape2<T,T,T>>
  - toString
```
public java.lang.String toString()
```
    Overrides:
    
    toString in class java.lang.Object