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

Class TumblingEventTimeWindows

java.lang.Object

org.apache.flink.streaming.api.windowing.assigners.WindowAssigner<Object,TimeWindow>

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

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

TumblingTimeWindows

@PublicEvolving
public class TumblingEventTimeWindows
extends WindowAssigner<Object,TimeWindow>

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

For example, in order to window into windows of 1 minute:

 
 DataStream<Tuple2<String, Integer>> in = ...;
 KeyedStream<Tuple2<String, Integer>, String> keyed = in.keyBy(...);
 WindowedStream<Tuple2<String, Integer>, String, TimeWindow> windowed =
   keyed.window(TumblingEventTimeWindows.of(Time.minutes(1)));
  

See Also:

Serialized Form

Nested Class Summary

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

WindowAssigner.WindowAssignerContext

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	TumblingEventTimeWindows(long size)

Method Summary

Modifier and Type	Method and Description
Collection<TimeWindow>	assignWindows(Object element, long timestamp, WindowAssigner.WindowAssignerContext context) Returns a Collection of windows that should be assigned to the element.
Trigger<Object,TimeWindow>	getDefaultTrigger(StreamExecutionEnvironment env) Returns the default trigger associated with this WindowAssigner.
long	getSize()
org.apache.flink.api.common.typeutils.TypeSerializer<TimeWindow>	getWindowSerializer(org.apache.flink.api.common.ExecutionConfig executionConfig) Returns a TypeSerializer for serializing windows that are assigned by this WindowAssigner.
boolean	isEventTime() Returns true if elements are assigned to windows based on event time, false otherwise.
static TumblingEventTimeWindows	of(Time size) Creates a new TumblingEventTimeWindows WindowAssigner that assigns elements to time windows based on the element timestamp.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

TumblingEventTimeWindows

protected TumblingEventTimeWindows(long size)

Method Detail

assignWindows

public Collection<TimeWindow> assignWindows(Object element,
                                            long timestamp,
                                            WindowAssigner.WindowAssignerContext context)

Description copied from class: WindowAssigner

Returns a Collection of windows that should be assigned to the element.

Specified by:

assignWindows in class WindowAssigner<Object,TimeWindow>

Parameters:

element - The element to which windows should be assigned.

timestamp - The timestamp of the element.

context - The WindowAssigner.WindowAssignerContext in which the assigner operates.

getSize

public long getSize()

getDefaultTrigger

public Trigger<Object,TimeWindow> getDefaultTrigger(StreamExecutionEnvironment env)

Description copied from class: WindowAssigner

Returns the default trigger associated with this WindowAssigner.

Specified by:

getDefaultTrigger in class WindowAssigner<Object,TimeWindow>

toString

public String toString()

Overrides:

toString in class Object

of

public static TumblingEventTimeWindows of(Time size)

Creates a new TumblingEventTimeWindows WindowAssigner that assigns elements to time windows based on the element timestamp.

Parameters:

size - The size of the generated windows.

Returns:

The time policy.

getWindowSerializer

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

Description copied from class: WindowAssigner

Returns a TypeSerializer for serializing windows that are assigned by this WindowAssigner.

Specified by:

getWindowSerializer in class WindowAssigner<Object,TimeWindow>

isEventTime

public boolean isEventTime()

Description copied from class: WindowAssigner

Returns true if elements are assigned to windows based on event time, false otherwise.

Specified by:

isEventTime in class WindowAssigner<Object,TimeWindow>