程序包 org.apache.pulsar.functions.windowing.evictors

类 WatermarkTimeEvictionPolicy<T>

java.lang.Object

org.apache.pulsar.functions.windowing.evictors.TimeEvictionPolicy<T>

org.apache.pulsar.functions.windowing.evictors.WatermarkTimeEvictionPolicy<T>

所有已实现的接口:

EvictionPolicy<T,EvictionContext>

public class WatermarkTimeEvictionPolicy<T>
extends TimeEvictionPolicy<T>

An eviction policy that evicts events based on time duration taking watermark time and event lag into account.

嵌套类概要

从接口继承的嵌套类/接口 org.apache.pulsar.functions.windowing.EvictionPolicy

EvictionPolicy.Action

字段概要

从类继承的字段 org.apache.pulsar.functions.windowing.evictors.TimeEvictionPolicy

evictionContext

构造器概要

构造器

构造器	说明
WatermarkTimeEvictionPolicy(long windowLength)	Constructs a WatermarkTimeEvictionPolicy that evicts events older than the given window length in millis.
WatermarkTimeEvictionPolicy(long windowLength, long lag)	Constructs a WatermarkTimeEvictionPolicy that evicts events older than the given window length in millis.

方法概要

修饰符和类型	方法	说明
EvictionPolicy.Action	evict(Event<T> event)	Decides if an event should be expired from the window, processed in the current window or kept for later processing.
String	toString()

从类继承的方法 org.apache.pulsar.functions.windowing.evictors.TimeEvictionPolicy

getContext, getState, reset, restoreState, setContext, track

从类继承的方法 java.lang.Object

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

构造器详细资料

WatermarkTimeEvictionPolicy

public WatermarkTimeEvictionPolicy(long windowLength)

Constructs a WatermarkTimeEvictionPolicy that evicts events older than the given window length in millis.

参数:

windowLength - the window length in milliseconds

WatermarkTimeEvictionPolicy

public WatermarkTimeEvictionPolicy(long windowLength,
 long lag)

Constructs a WatermarkTimeEvictionPolicy that evicts events older than the given window length in millis. The lag parameter can be used in the case of event based ts to break the queue scan early.

参数:

windowLength - the window length in milliseconds

lag - the max event lag in milliseconds

方法详细资料

evict

public EvictionPolicy.Action evict(Event<T> event)

Decides if an event should be expired from the window, processed in the current window or kept for later processing.

Keeps events with future ts in the queue for processing in the next window. If the ts difference is more than the lag, stops scanning the queue for the current window.

指定者:

evict 在接口中 EvictionPolicy<T,EvictionContext>

覆盖:

evict 在类中 TimeEvictionPolicy<T>

参数:

event - the input event

返回:

the EvictionPolicy.Action to be taken based on the input event

toString

public String toString()

覆盖:

toString 在类中 TimeEvictionPolicy<T>