Output (Flink : Runtime 2.0-preview1 API)

Type Parameters:

T - The type of the elements that can be emitted.

All Superinterfaces:

org.apache.flink.util.Collector<T>

All Known Subinterfaces:

OutputWithChainingCheck<OUT>, WatermarkGaugeExposingOutput<T>

All Known Implementing Classes:

CountingOutput, FinishedOnRestoreMainOperatorOutput, RecordWriterOutput, TimestampedCollector
```
@PublicEvolving
public interface Output<T>
extends org.apache.flink.util.Collector<T>
```
A StreamOperator is supplied with an object of this interface that can be used to emit elements and other messages, such as barriers and watermarks, from an operator.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`<X> void`	`collect(org.apache.flink.util.OutputTag<X> outputTag, StreamRecord<X> record)`	Emits a record to the side output identified by the given `OutputTag`.
`void`	`emitLatencyMarker(LatencyMarker latencyMarker)`
`void`	`emitRecordAttributes(RecordAttributes recordAttributes)`	Emits a `RecordAttributes` from an operator.
`void`	`emitWatermark(Watermark mark)`	Emits a `Watermark` from an operator.
`void`	`emitWatermarkStatus(WatermarkStatus watermarkStatus)`

Methods inherited from interface org.apache.flink.util.Collector
close, collect

- Method Detail
  - emitWatermark
```
void emitWatermark(Watermark mark)
```
    Emits a Watermark from an operator. This watermark is broadcast to all downstream operators.
    A watermark specifies that no element with a timestamp lower or equal to the watermark timestamp will be emitted in the future.
  - emitWatermarkStatus
```
void emitWatermarkStatus(WatermarkStatus watermarkStatus)
```
  - collect
```
<X> void collect(org.apache.flink.util.OutputTag<X> outputTag,
                 StreamRecord<X> record)
```
    Emits a record to the side output identified by the given OutputTag.
    
    Parameters:
    
    record - The record to collect.
  - emitLatencyMarker
```
void emitLatencyMarker(LatencyMarker latencyMarker)
```
  - emitRecordAttributes
```
@Experimental
void emitRecordAttributes(RecordAttributes recordAttributes)
```
    Emits a RecordAttributes from an operator. This element is broadcast to all downstream operators.