Package org.apache.flink.streaming.api.operators

Interface Output<T>

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, TimestampedCollectorWithDeclaredVariable
@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 Details

    • 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.

    • emitWatermark

      @Experimental void emitWatermark(WatermarkEvent watermark)
      Emits a Watermark from an operator, wrapped in a WatermarkEvent.