WatermarkGenerator (Flink : Table : Runtime 2.0.0 API)

java.lang.Object
- org.apache.flink.api.common.functions.AbstractRichFunction
- - org.apache.flink.table.runtime.generated.WatermarkGenerator

All Implemented Interfaces:

Serializable, org.apache.flink.api.common.functions.Function, org.apache.flink.api.common.functions.RichFunction

Direct Known Subclasses:

BoundedOutOfOrderWatermarkGenerator
```
public abstract class WatermarkGenerator
extends org.apache.flink.api.common.functions.AbstractRichFunction
```
The WatermarkGenerator is used to generate watermark based the input elements.

See Also:

Serialized Form

Constructor Summary

Constructors
Constructor Description

WatermarkGenerator()

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`abstract Long`	`currentWatermark(org.apache.flink.table.data.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
  - WatermarkGenerator
```
public WatermarkGenerator()
```
- Method Detail
  - currentWatermark
```
@Nullable
public abstract Long currentWatermark(org.apache.flink.table.data.RowData row)
                               throws Exception
```
    Returns the watermark for the current row or null if no watermark should be generated.
    
    Parameters:
    
    row - The current row.
    
    Returns:
    
    The watermark for this row or null if no watermark should be generated.
    
    Throws:
    
    Exception