Package org.apache.flink.streaming.api.windowing.assigners

Class DynamicEventTimeSessionWindows<T>

java.lang.Object

org.apache.flink.streaming.api.windowing.assigners.WindowAssigner<T,W>

org.apache.flink.streaming.api.windowing.assigners.MergingWindowAssigner<T,org.apache.flink.streaming.api.windowing.windows.TimeWindow>

org.apache.flink.streaming.api.windowing.assigners.DynamicEventTimeSessionWindows<T>

Type Parameters:

T - The type of the input elements

All Implemented Interfaces:

Serializable

@PublicEvolving
public class DynamicEventTimeSessionWindows<T>
extends org.apache.flink.streaming.api.windowing.assigners.MergingWindowAssigner<T,org.apache.flink.streaming.api.windowing.windows.TimeWindow>

A WindowAssigner that windows elements into sessions based on the timestamp of the elements. Windows cannot overlap.

For example, in order to window into windows with a dynamic time gap:

 DataStream<Tuple2<String, Integer>> in = ...;
 KeyedStream<String, Tuple2<String, Integer>> keyed = in.keyBy(...);
 WindowedStream<Tuple2<String, Integer>, String, TimeWindows> windowed =
   keyed.window(DynamicEventTimeSessionWindows.withDynamicGap({@link SessionWindowTimeGapExtractor }));
 

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.flink.streaming.api.windowing.assigners.MergingWindowAssigner

org.apache.flink.streaming.api.windowing.assigners.MergingWindowAssigner.MergeCallback<W extends Object>

Nested classes/interfaces inherited from class org.apache.flink.streaming.api.windowing.assigners.WindowAssigner

org.apache.flink.streaming.api.windowing.assigners.WindowAssigner.WindowAssignerContext

Field Summary

Fields

Modifier and Type	Field	Description
protected SessionWindowTimeGapExtractor<T>	sessionWindowTimeGapExtractor

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	DynamicEventTimeSessionWindows(SessionWindowTimeGapExtractor<T> sessionWindowTimeGapExtractor)

Method Summary

Modifier and Type	Method	Description
Collection<org.apache.flink.streaming.api.windowing.windows.TimeWindow>	assignWindows(T element, long timestamp, org.apache.flink.streaming.api.windowing.assigners.WindowAssigner.WindowAssignerContext context)
org.apache.flink.streaming.api.windowing.triggers.Trigger<T,org.apache.flink.streaming.api.windowing.windows.TimeWindow>	getDefaultTrigger()
org.apache.flink.api.common.typeutils.TypeSerializer<org.apache.flink.streaming.api.windowing.windows.TimeWindow>	getWindowSerializer(org.apache.flink.api.common.ExecutionConfig executionConfig)
boolean	isEventTime()
void	mergeWindows(Collection<org.apache.flink.streaming.api.windowing.windows.TimeWindow> windows, org.apache.flink.streaming.api.windowing.assigners.MergingWindowAssigner.MergeCallback<org.apache.flink.streaming.api.windowing.windows.TimeWindow> c)	Merge overlapping TimeWindows.
String	toString()
static <T> DynamicEventTimeSessionWindows<T>	withDynamicGap(SessionWindowTimeGapExtractor<T> sessionWindowTimeGapExtractor)	Creates a new SessionWindows WindowAssigner that assigns elements to sessions based on the element timestamp.

Methods inherited from class java.lang.Object

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

Field Detail

sessionWindowTimeGapExtractor

protected SessionWindowTimeGapExtractor<T> sessionWindowTimeGapExtractor

Constructor Detail

DynamicEventTimeSessionWindows

protected DynamicEventTimeSessionWindows(SessionWindowTimeGapExtractor<T> sessionWindowTimeGapExtractor)

Method Detail

assignWindows

public Collection<org.apache.flink.streaming.api.windowing.windows.TimeWindow> assignWindows(T element,
                                                                                             long timestamp,
                                                                                             org.apache.flink.streaming.api.windowing.assigners.WindowAssigner.WindowAssignerContext context)

Specified by:

assignWindows in class org.apache.flink.streaming.api.windowing.assigners.WindowAssigner<T,org.apache.flink.streaming.api.windowing.windows.TimeWindow>

getDefaultTrigger

public org.apache.flink.streaming.api.windowing.triggers.Trigger<T,org.apache.flink.streaming.api.windowing.windows.TimeWindow> getDefaultTrigger()

Specified by:

getDefaultTrigger in class org.apache.flink.streaming.api.windowing.assigners.WindowAssigner<T,org.apache.flink.streaming.api.windowing.windows.TimeWindow>

toString

public String toString()

Overrides:

toString in class Object

withDynamicGap

public static <T> DynamicEventTimeSessionWindows<T> withDynamicGap(SessionWindowTimeGapExtractor<T> sessionWindowTimeGapExtractor)

Creates a new SessionWindows WindowAssigner that assigns elements to sessions based on the element timestamp.

Parameters:

sessionWindowTimeGapExtractor - The extractor to use to extract the time gap from the input elements

Returns:

The policy.

getWindowSerializer

public org.apache.flink.api.common.typeutils.TypeSerializer<org.apache.flink.streaming.api.windowing.windows.TimeWindow> getWindowSerializer(org.apache.flink.api.common.ExecutionConfig executionConfig)

Specified by:

getWindowSerializer in class org.apache.flink.streaming.api.windowing.assigners.WindowAssigner<T,org.apache.flink.streaming.api.windowing.windows.TimeWindow>

isEventTime

public boolean isEventTime()

Specified by:

isEventTime in class org.apache.flink.streaming.api.windowing.assigners.WindowAssigner<T,org.apache.flink.streaming.api.windowing.windows.TimeWindow>

mergeWindows

public void mergeWindows(Collection<org.apache.flink.streaming.api.windowing.windows.TimeWindow> windows,
                         org.apache.flink.streaming.api.windowing.assigners.MergingWindowAssigner.MergeCallback<org.apache.flink.streaming.api.windowing.windows.TimeWindow> c)

Merge overlapping TimeWindows.

Specified by:

mergeWindows in class org.apache.flink.streaming.api.windowing.assigners.MergingWindowAssigner<T,org.apache.flink.streaming.api.windowing.windows.TimeWindow>