@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>
WindowFunction
that is used for implementing a fold on a window configuration
that only allows WindowFunction
and cannot directly execute a ReduceFunction
.构造器和说明 |
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ReduceApplyWindowFunction(org.apache.flink.api.common.functions.ReduceFunction<T> reduceFunction,
WindowFunction<T,R,K,W> windowFunction) |
限定符和类型 | 方法和说明 |
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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.
|
close, getWrappedFunction, open, setRuntimeContext
public void apply(K k, W window, Iterable<T> input, org.apache.flink.util.Collector<R> out) throws Exception
WindowFunction
apply
在接口中 WindowFunction<T,R,K,W extends Window>
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.Exception
- The function may throw exceptions to fail the program and trigger recovery.Copyright © 2014–2019 The Apache Software Foundation. All rights reserved.