Concat

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

All Implemented Interfaces:

Graph<UniformFanInShape<T,T>,NotUsed>
```
public final class Concat<T>
extends GraphStage<UniformFanInShape<T,T>>
```
Takes multiple streams and outputs one stream formed from the input streams by first emitting all of the elements from the first stream and then emitting all of the elements from the second stream, etc.
A Concat has one first port, one second port and one out port.
'''Emits when''' the current stream has an element available; if the current input completes, it tries the next one
'''Backpressures when''' downstream backpressures
'''Completes when''' all upstreams complete
'''Cancels when''' downstream cancels

Constructor Summary

Constructors
Constructor Description

Concat(int inputPorts)

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static <T> Graph<UniformFanInShape<T,T>,NotUsed>`	`apply(int inputPorts)`
`static <T> int`	`apply$default$1()`
`GraphStageLogic`	`createLogic(Attributes inheritedAttributes)`
`scala.collection.immutable.IndexedSeq<Inlet<T>>`	`in()`
`Attributes`	`initialAttributes()`
`int`	`inputPorts()`
`Outlet<T>`	`out()`
`UniformFanInShape<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
- Concat
```
public Concat(int inputPorts)
```

Method Detail

apply

public static <T> Graph<UniformFanInShape<T,T>,NotUsed> apply(int inputPorts)

apply$default$1

public static <T> int apply$default$1()

inputPorts
```
public int inputPorts()
```

in

public scala.collection.immutable.IndexedSeq<Inlet<T>> in()

out
```
public Outlet<T> out()
```

initialAttributes
```
public Attributes initialAttributes()
```
Overrides:

initialAttributes in class GraphStageWithMaterializedValue<UniformFanInShape<T,T>,NotUsed>

shape
```
public UniformFanInShape<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<UniformFanInShape<T,T>>

toString
```
public java.lang.String toString()
```
Overrides:

toString in class java.lang.Object