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

Class SlidingProcessingTimeWindows

java.lang.Object

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

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

All Implemented Interfaces:

Serializable

public class SlidingProcessingTimeWindows
extends WindowAssigner<Object,TimeWindow>

A WindowAssigner that windows elements into sliding windows based on the current system time of the machine the operation is running on. Windows can possibly overlap.

For example, in order to window into windows of 1 minute, every 10 seconds:

 
 DataStream<Tuple2<String, Integer>> in = ...;
 KeyedStream<String, Tuple2<String, Integer>> keyed = in.keyBy(...);
 WindowedStream<Tuple2<String, Integer>, String, TimeWindows> windowed =
   keyed.window(SlidingProcessingTimeWindows.of(Time.of(1, MINUTES), Time.of(10, SECONDS));
  

See Also:

Serialized Form

Nested Class Summary

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

WindowAssigner.WindowAssignerContext

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()
long	getSlide()
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 SlidingProcessingTimeWindows	of(Time size, Time slide) Creates a new SlidingProcessingTimeWindows WindowAssigner that assigns elements to sliding 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

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()

getSlide

public long getSlide()

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 SlidingProcessingTimeWindows of(Time size,
                                              Time slide)

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

Parameters:

size - The size of the generated windows.

slide - The slide interval 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>