org.apache.flink.api.java.operators.translation

类 KeyExtractingMapper<T,K>

java.lang.Object

org.apache.flink.api.common.functions.AbstractRichFunction

org.apache.flink.api.common.functions.RichMapFunction<T,org.apache.flink.api.java.tuple.Tuple2<K,T>>

org.apache.flink.api.java.operators.translation.KeyExtractingMapper<T,K>

类型参数:

T - type of value

K - type of key

所有已实现的接口:

Serializable, org.apache.flink.api.common.functions.Function, org.apache.flink.api.common.functions.MapFunction<T,org.apache.flink.api.java.tuple.Tuple2<K,T>>, org.apache.flink.api.common.functions.RichFunction

@Internal
public final class KeyExtractingMapper<T,K>
extends org.apache.flink.api.common.functions.RichMapFunction<T,org.apache.flink.api.java.tuple.Tuple2<K,T>>

Mapper that extracts keys.

另请参阅:

序列化表格

构造器概要

构造器

构造器和说明
KeyExtractingMapper(org.apache.flink.api.java.functions.KeySelector<T,K> keySelector)

方法概要

限定符和类型	方法和说明
org.apache.flink.api.java.tuple.Tuple2<K,T>	map(T value)

从类继承的方法 org.apache.flink.api.common.functions.AbstractRichFunction

close, getIterationRuntimeContext, getRuntimeContext, open, setRuntimeContext

从类继承的方法 java.lang.Object

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

构造器详细资料

KeyExtractingMapper

public KeyExtractingMapper(org.apache.flink.api.java.functions.KeySelector<T,K> keySelector)

方法详细资料

map

public org.apache.flink.api.java.tuple.Tuple2<K,T> map(T value)
                                                throws Exception

指定者:

map 在接口中 org.apache.flink.api.common.functions.MapFunction<T,org.apache.flink.api.java.tuple.Tuple2<K,T>>

指定者:

map 在类中 org.apache.flink.api.common.functions.RichMapFunction<T,org.apache.flink.api.java.tuple.Tuple2<K,T>>

抛出:

Exception