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

枚举 WindowStagger

java.lang.Object

java.lang.Enum<WindowStagger>

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

所有已实现的接口:

Serializable, Comparable<WindowStagger>

@PublicEvolving
public enum WindowStagger
extends Enum<WindowStagger>

A WindowStagger staggers offset in runtime for each window assignment.

枚举常量概要

枚举常量

枚举常量和说明
ALIGNED Default mode, all panes fire at the same time across all partitions.
NATURAL When the first event is received in the window operator, take the difference between the start of the window and current procesing time as the offset.
RANDOM Stagger offset is sampled from uniform distribution U(0, WindowSize) when first event ingested in the partitioned operator.

方法概要

限定符和类型	方法和说明
abstract long	getStaggerOffset(long currentProcessingTime, long size)
static WindowStagger	valueOf(String name) 返回带有指定名称的该类型的枚举常量。
static WindowStagger[]	values() 按照声明该枚举类型的常量的顺序, 返回 包含这些常量的数组。

从类继承的方法 java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

从类继承的方法 java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

枚举常量详细资料

ALIGNED

public static final WindowStagger ALIGNED

Default mode, all panes fire at the same time across all partitions.

RANDOM

public static final WindowStagger RANDOM

Stagger offset is sampled from uniform distribution U(0, WindowSize) when first event ingested in the partitioned operator.

NATURAL

public static final WindowStagger NATURAL

When the first event is received in the window operator, take the difference between the start of the window and current procesing time as the offset. This way, windows are staggered based on when each parallel operator receives the first event.

方法详细资料

values

public static WindowStagger[] values()

按照声明该枚举类型的常量的顺序, 返回 包含这些常量的数组。该方法可用于迭代 常量, 如下所示:

for (WindowStagger c : WindowStagger.values())
    System.out.println(c);

返回:

按照声明该枚举类型的常量的顺序返回的包含这些常量的数组

valueOf

public static WindowStagger valueOf(String name)

返回带有指定名称的该类型的枚举常量。 字符串必须与用于声明该类型的枚举常量的 标识符完全匹配。(不允许有多余 的空格字符。)

参数:

name - 要返回的枚举常量的名称。

返回:

返回带有指定名称的枚举常量

抛出:

IllegalArgumentException - 如果该枚举类型没有带有指定名称的常量

NullPointerException - 如果参数为空值

getStaggerOffset

public abstract long getStaggerOffset(long currentProcessingTime,
                                      long size)