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

Class CountEvictor<W extends Window>

java.lang.Object

org.apache.flink.streaming.api.windowing.evictors.CountEvictor<W>

Type Parameters:

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

All Implemented Interfaces:

Serializable, Evictor<Object,W>

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

An Evictor that keeps up to a certain amount of elements.

See Also:

Serialized Form

Method Summary

Modifier and Type	Method and Description
int	evict(Iterable<StreamRecord<Object>> elements, int size, W window) Computes how many elements should be removed from the pane.
static <W extends Window> CountEvictor<W>	of(long maxCount) Creates a CountEvictor that keeps the given number of elements.

Methods inherited from class java.lang.Object

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

Method Detail

evict

public int evict(Iterable<StreamRecord<Object>> 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<Object,W extends Window>

Parameters:

elements - The elements currently in the pane.

size - The current number of elements in the pane.

window - The Window

of

public static <W extends Window> CountEvictor<W> of(long maxCount)

Creates a CountEvictor that keeps the given number of elements.

Parameters:

maxCount - The number of elements to keep in the pane.