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

类 CountEvictor<W extends Window>

java.lang.Object

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

类型参数:

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

所有已实现的接口:

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.

另请参阅:

序列化表格

嵌套类概要

从接口继承的嵌套类/接口 org.apache.flink.streaming.api.windowing.evictors.Evictor

Evictor.EvictorContext

方法概要

限定符和类型	方法和说明
void	evictAfter(Iterable<TimestampedValue<Object>> elements, int size, W window, Evictor.EvictorContext ctx) Optionally evicts elements.
void	evictBefore(Iterable<TimestampedValue<Object>> elements, int size, W window, Evictor.EvictorContext ctx) Optionally evicts elements.
static <W extends Window> CountEvictor<W>	of(long maxCount) Creates a CountEvictor that keeps the given number of elements.
static <W extends Window> CountEvictor<W>	of(long maxCount, boolean doEvictAfter) Creates a CountEvictor that keeps the given number of elements in the pane Eviction is done before/after the window function based on the value of doEvictAfter.

从类继承的方法 java.lang.Object

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

方法详细资料

evictBefore

public void evictBefore(Iterable<TimestampedValue<Object>> elements,
                        int size,
                        W window,
                        Evictor.EvictorContext ctx)

从接口复制的说明: Evictor

Optionally evicts elements. Called before windowing function.

指定者:

evictBefore 在接口中 Evictor<Object,W extends Window>

参数:

elements - The elements currently in the pane.

size - The current number of elements in the pane.

window - The Window

ctx - The context for the Evictor

evictAfter

public void evictAfter(Iterable<TimestampedValue<Object>> elements,
                       int size,
                       W window,
                       Evictor.EvictorContext ctx)

从接口复制的说明: Evictor

Optionally evicts elements. Called after windowing function.

指定者:

evictAfter 在接口中 Evictor<Object,W extends Window>

参数:

elements - The elements currently in the pane.

size - The current number of elements in the pane.

window - The Window

ctx - The context for the Evictor

of

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

Creates a CountEvictor that keeps the given number of elements. Eviction is done before the window function.

参数:

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

of

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

Creates a CountEvictor that keeps the given number of elements in the pane Eviction is done before/after the window function based on the value of doEvictAfter.

参数:

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

doEvictAfter - Whether to do eviction after the window function.