org.apache.flink.table.runtime.operators.wmassigners

Class BoundedOutOfOrderWatermarkGenerator

java.lang.Object

org.apache.flink.api.common.functions.AbstractRichFunction

org.apache.flink.table.runtime.generated.WatermarkGenerator

org.apache.flink.table.runtime.operators.wmassigners.BoundedOutOfOrderWatermarkGenerator

All Implemented Interfaces:

Serializable, Function, RichFunction

public class BoundedOutOfOrderWatermarkGenerator
extends WatermarkGenerator

A watermark generator for rowtime attributes which are out-of-order by a bounded time interval.

Emits watermarks which are the observed timestamp minus the specified delay.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
BoundedOutOfOrderWatermarkGenerator(int rowtimeIndex, long delay)

Method Summary

Modifier and Type	Method and Description
Long	currentWatermark(RowData row) Returns the watermark for the current row or null if no watermark should be generated.

Methods inherited from class org.apache.flink.api.common.functions.AbstractRichFunction

close, getIterationRuntimeContext, getRuntimeContext, open, setRuntimeContext

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

BoundedOutOfOrderWatermarkGenerator

public BoundedOutOfOrderWatermarkGenerator(int rowtimeIndex,
                                           long delay)

Parameters:

rowtimeIndex - the field index of rowtime attribute, the value of rowtime should never be null.

delay - The delay by which watermarks are behind the observed timestamp.

Method Detail

currentWatermark

@Nullable
public Long currentWatermark(RowData row)

Description copied from class: WatermarkGenerator

Returns the watermark for the current row or null if no watermark should be generated.

Specified by:

currentWatermark in class WatermarkGenerator

Parameters:

row - The current row.

Returns:

The watermark for this row or null if no watermark should be generated.