org.apache.flink.streaming.api.windowing.evictors

Class DeltaEvictor<T,W extends Window>

java.lang.Object

org.apache.flink.streaming.api.windowing.evictors.DeltaEvictor<T,W>

Type Parameters:

W - The type of Windows on which this Evictor can operate.

All Implemented Interfaces:

Serializable, Evictor<T,W>

@PublicEvolving
public class DeltaEvictor<T,W extends Window>
extends Object
implements Evictor<T,W>

An Evictor that keeps elements based on a DeltaFunction and a threshold.

Eviction starts from the first element of the buffer and removes all elements from the buffer which have a higher delta then the threshold. As soon as there is an element with a lower delta, the eviction stops.

See Also:

Serialized Form

Method Summary

Modifier and Type	Method and Description
int	evict(Iterable<StreamRecord<T>> elements, int size, W window) Computes how many elements should be removed from the pane.
static <T,W extends Window> DeltaEvictor<T,W>	of(double threshold, DeltaFunction<T> deltaFunction) Creates a DeltaEvictor from the given threshold and DeltaFunction.
String	toString()

Methods inherited from class java.lang.Object

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

Method Detail

evict

public int evict(Iterable<StreamRecord<T>> elements,
                 int size,
                 W window)

Description copied from interface: Evictor

Computes how many elements should be removed from the pane. The result specifies how many elements should be removed from the beginning.

Specified by:

evict in interface Evictor<T,W extends Window>

Parameters:

elements - The elements currently in the pane.

size - The current number of elements in the pane.

window - The Window

toString

public String toString()

Overrides:

toString in class Object

of

public static <T,W extends Window> DeltaEvictor<T,W> of(double threshold,
                                                        DeltaFunction<T> deltaFunction)

Creates a DeltaEvictor from the given threshold and DeltaFunction.

Parameters:

threshold - The threshold

deltaFunction - The DeltaFunction