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

Class ReduceApplyAllWindowFunction<W extends Window,T,R>

java.lang.Object

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

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

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

All Implemented Interfaces:

Serializable, Function, RichFunction, AllWindowFunction<T,R,W>

@Internal
public class ReduceApplyAllWindowFunction<W extends Window,T,R>
extends WrappingFunction<AllWindowFunction<T,R,W>>
implements AllWindowFunction<T,R,W>

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

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.flink.api.java.operators.translation.WrappingFunction

wrappedFunction

Constructor Summary

Constructors

Constructor and Description
ReduceApplyAllWindowFunction(ReduceFunction<T> reduceFunction, AllWindowFunction<T,R,W> windowFunction)

Method Summary

Modifier and Type	Method and Description
void	apply(W window, Iterable<T> input, Collector<R> out) Evaluates the window and outputs none or several elements.

Methods inherited from class org.apache.flink.api.java.operators.translation.WrappingFunction

close, getWrappedFunction, open, setRuntimeContext

Methods inherited from class org.apache.flink.api.common.functions.AbstractRichFunction

getIterationRuntimeContext, getRuntimeContext, open

Methods inherited from class java.lang.Object

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

Constructor Detail

ReduceApplyAllWindowFunction

public ReduceApplyAllWindowFunction(ReduceFunction<T> reduceFunction,
                                    AllWindowFunction<T,R,W> windowFunction)

Method Detail

apply

public void apply(W window,
                  Iterable<T> input,
                  Collector<R> out)
           throws Exception

Description copied from interface: AllWindowFunction

Evaluates the window and outputs none or several elements.

Specified by:

apply in interface AllWindowFunction<T,R,W extends Window>

Parameters:

window - The window that is being evaluated.

input - The elements in the window being evaluated.

out - A collector for emitting elements.

Throws:

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