Package org.apache.flink.streaming.util.watermark

Class WatermarkUtils

java.lang.Object

org.apache.flink.streaming.util.watermark.WatermarkUtils

public final class WatermarkUtils
extends Object

Utils class for Watermark.

Constructor Summary

Constructors

Constructor	Description
WatermarkUtils()

Method Summary

Modifier and Type	Method	Description
static void	addEventTimeWatermarkCombinerIfNeeded(Set<AbstractInternalWatermarkDeclaration<?>> watermarkDeclarationSet, Map<String,WatermarkCombiner> watermarkCombiners, int numberOfInputChannels)	Create watermark combiners if there are event time watermark declarations.
static Set<AbstractInternalWatermarkDeclaration<?>>	convertToInternalWatermarkDeclarations(Set<org.apache.flink.api.common.watermark.WatermarkDeclaration> watermarkDeclarations)	Convert user-oriented WatermarkDeclaration instance to internal-oriented AbstractInternalWatermarkDeclaration instance.
static Set<AbstractInternalWatermarkDeclaration<?>>	getInternalWatermarkDeclarationsFromStreamGraph(StreamGraph streamGraph)	Retrieve the declared watermarks from StreamGraph and convert them into InternalWatermarkDeclaration.

Methods inherited from class java.lang.Object

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

Constructor Details

WatermarkUtils

public WatermarkUtils()

Method Details

getInternalWatermarkDeclarationsFromStreamGraph

public static Set<AbstractInternalWatermarkDeclaration<?>> getInternalWatermarkDeclarationsFromStreamGraph(StreamGraph streamGraph)

Retrieve the declared watermarks from StreamGraph and convert them into InternalWatermarkDeclaration.

convertToInternalWatermarkDeclarations

public static Set<AbstractInternalWatermarkDeclaration<?>> convertToInternalWatermarkDeclarations(Set<org.apache.flink.api.common.watermark.WatermarkDeclaration> watermarkDeclarations)

Convert user-oriented WatermarkDeclaration instance to internal-oriented AbstractInternalWatermarkDeclaration instance.

addEventTimeWatermarkCombinerIfNeeded

public static void addEventTimeWatermarkCombinerIfNeeded(Set<AbstractInternalWatermarkDeclaration<?>> watermarkDeclarationSet,
 Map<String,WatermarkCombiner> watermarkCombiners,
 int numberOfInputChannels)

Create watermark combiners if there are event time watermark declarations.