org.apache.flink.runtime.state

接口 KeyExtractorFunction<T>

类型参数:

T - type of the element from which we extract the key.

函数接口:

这是一个函数接口, 因此可用作 lambda 表达式或方法引用的赋值目标。

@FunctionalInterface
public interface KeyExtractorFunction<T>

Function to extract a key from a given object.

字段概要

字段

限定符和类型	字段和说明
static KeyExtractorFunction<? extends Keyed<?>>	FOR_KEYED_OBJECTS

方法概要

限定符和类型	方法和说明
Object	extractKeyFromElement(T element) Returns the key for the given element by which the key-group can be computed.
static <T extends Keyed<?>> KeyExtractorFunction<T>	forKeyedObjects()

字段详细资料

FOR_KEYED_OBJECTS

static final KeyExtractorFunction<? extends Keyed<?>> FOR_KEYED_OBJECTS

方法详细资料

extractKeyFromElement

@Nonnull
Object extractKeyFromElement(@Nonnull
                                      T element)

Returns the key for the given element by which the key-group can be computed.

forKeyedObjects

static <T extends Keyed<?>> KeyExtractorFunction<T> forKeyedObjects()