org.apache.flink.streaming.api.functions.windowing

类 ReduceApplyWindowFunction<K,W extends Window,T,R>

java.lang.Object

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

org.apache.flink.api.java.operators.translation.WrappingFunction<WindowFunction<T,R,K,W>>

org.apache.flink.streaming.api.functions.windowing.ReduceApplyWindowFunction<K,W,T,R>

所有已实现的接口:

Serializable, org.apache.flink.api.common.functions.Function, org.apache.flink.api.common.functions.RichFunction, WindowFunction<T,R,K,W>

@Internal
public class ReduceApplyWindowFunction<K,W extends Window,T,R>
extends org.apache.flink.api.java.operators.translation.WrappingFunction<WindowFunction<T,R,K,W>>
implements WindowFunction<T,R,K,W>

Internal WindowFunction that is used for implementing a fold on a window configuration that only allows WindowFunction and cannot directly execute a ReduceFunction.

另请参阅:

序列化表格

字段概要

从类继承的字段 org.apache.flink.api.java.operators.translation.WrappingFunction

wrappedFunction

构造器概要

构造器

构造器和说明
ReduceApplyWindowFunction(org.apache.flink.api.common.functions.ReduceFunction<T> reduceFunction, WindowFunction<T,R,K,W> windowFunction)

方法概要

限定符和类型	方法和说明
void	apply(K k, W window, Iterable<T> input, org.apache.flink.util.Collector<R> out) Evaluates the window and outputs none or several elements.

从类继承的方法 org.apache.flink.api.java.operators.translation.WrappingFunction

close, getWrappedFunction, open, setRuntimeContext

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

getIterationRuntimeContext, getRuntimeContext

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

ReduceApplyWindowFunction

public ReduceApplyWindowFunction(org.apache.flink.api.common.functions.ReduceFunction<T> reduceFunction,
                                 WindowFunction<T,R,K,W> windowFunction)

方法详细资料

apply

public void apply(K k,
                  W window,
                  Iterable<T> input,
                  org.apache.flink.util.Collector<R> out)
           throws Exception

从接口复制的说明: WindowFunction

Evaluates the window and outputs none or several elements.

指定者:

apply 在接口中 WindowFunction<T,R,K,W extends Window>

参数:

k - The key for which this window is evaluated.

window - The window that is being evaluated.

input - The elements in the window being evaluated.

out - A collector for emitting elements.

抛出:

Exception - The function may throw exceptions to fail the program and trigger recovery.