SinkRef

```
public interface SinkRef<In>
```
A SinkRef allows sharing a "reference" to a Sink with others, with the main purpose of crossing a network boundary. Usually obtaining a SinkRef would be done via Actor messaging, in which one system asks a remote one, to accept some data from it, and the remote one decides to accept the request to send data in a back-pressured streaming fashion -- using a sink ref.
To create a SinkRef you have to materialize the Sink that you want to obtain a reference to by attaching it to a StreamRefs.sinkRef().
Stream refs can be seen as Reactive Streams over network boundaries. See also SourceRef which is the dual of a SinkRef.
For additional configuration see reference.conf as well as StreamRefAttributes.
Not for user extension.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`Sink<In,NotUsed>`	`getSink()`	Java API: Get `javadsl.Sink` underlying to this source ref.
`Sink<In,NotUsed>`	`sink()`	Scala API: Get `Sink` underlying to this source ref.

- Method Detail
  - sink
```
Sink<In,NotUsed> sink()
```
    Scala API: Get Sink underlying to this source ref.
  - getSink
```
Sink<In,NotUsed> getSink()
```
    Java API: Get javadsl.Sink underlying to this source ref.