org.apache.flink.api.java.functions

类 FirstReducer<T>

java.lang.Object

org.apache.flink.api.java.functions.FirstReducer<T>

类型参数:

T -

所有已实现的接口:

Serializable, org.apache.flink.api.common.functions.Function, org.apache.flink.api.common.functions.GroupCombineFunction<T,T>, org.apache.flink.api.common.functions.GroupReduceFunction<T,T>

@Internal
public class FirstReducer<T>
extends Object
implements org.apache.flink.api.common.functions.GroupReduceFunction<T,T>, org.apache.flink.api.common.functions.GroupCombineFunction<T,T>

Reducer that only emits the first N elements in a group.

另请参阅:

序列化表格

构造器概要

构造器

构造器和说明
FirstReducer(int n)

方法概要

限定符和类型	方法和说明
void	combine(Iterable<T> values, org.apache.flink.util.Collector<T> out)
void	reduce(Iterable<T> values, org.apache.flink.util.Collector<T> out)

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

FirstReducer

public FirstReducer(int n)

方法详细资料

reduce

public void reduce(Iterable<T> values,
                   org.apache.flink.util.Collector<T> out)
            throws Exception

指定者:

reduce 在接口中 org.apache.flink.api.common.functions.GroupReduceFunction<T,T>

抛出:

Exception

combine

public void combine(Iterable<T> values,
                    org.apache.flink.util.Collector<T> out)
             throws Exception

指定者:

combine 在接口中 org.apache.flink.api.common.functions.GroupCombineFunction<T,T>

抛出:

Exception