org.apache.flink.streaming.api.windowing.triggers

枚举 TriggerResult

java.lang.Object

java.lang.Enum<TriggerResult>

org.apache.flink.streaming.api.windowing.triggers.TriggerResult

所有已实现的接口:

Serializable, Comparable<TriggerResult>

public enum TriggerResult
extends Enum<TriggerResult>

Result type for trigger methods. This determines what happens with the window, for example whether the window function should be called, or the window should be discarded.

If a Trigger returns FIRE or FIRE_AND_PURGE but the window does not contain any data the window function will not be invoked, i.e. no data will be produced for the window.

枚举常量概要

枚举常量

枚举常量和说明
CONTINUE No action is taken on the window.
FIRE On FIRE, the window is evaluated and results are emitted.
FIRE_AND_PURGE FIRE_AND_PURGE evaluates the window function and emits the window result.
PURGE All elements in the window are cleared and the window is discarded, without evaluating the window function or emitting any elements.

方法概要

限定符和类型	方法和说明
boolean	isFire()
boolean	isPurge()
static TriggerResult	valueOf(String name) 返回带有指定名称的该类型的枚举常量。
static TriggerResult[]	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

CONTINUE

public static final TriggerResult CONTINUE

No action is taken on the window.

FIRE_AND_PURGE

public static final TriggerResult FIRE_AND_PURGE

FIRE_AND_PURGE evaluates the window function and emits the window result.

FIRE

public static final TriggerResult FIRE

On FIRE, the window is evaluated and results are emitted. The window is not purged, though, all elements are retained.

PURGE

public static final TriggerResult PURGE

All elements in the window are cleared and the window is discarded, without evaluating the window function or emitting any elements.

方法详细资料

values

public static TriggerResult[] 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 (TriggerResult c : TriggerResult.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 TriggerResult 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

isFire

public boolean isFire()

isPurge

public boolean isPurge()