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

Class AggregateApplyWindowFunction<K,W extends Window,T,ACC,V,R>

java.lang.Object

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

org.apache.flink.api.common.functions.WrappingFunction<WindowFunction<V,R,K,W>>

org.apache.flink.streaming.api.functions.windowing.AggregateApplyWindowFunction<K,W,T,ACC,V,R>

Type Parameters:

K - The key type

W - The window type

T - The type of the input to the AggregateFunction

ACC - The type of the AggregateFunction's accumulator

V - The type of the AggregateFunction's result, and the input to the WindowFunction

R - The result type of the WindowFunction

All Implemented Interfaces:

Serializable, Function, RichFunction, WindowFunction<T,R,K,W>

@Internal
public class AggregateApplyWindowFunction<K,W extends Window,T,ACC,V,R>
extends WrappingFunction<WindowFunction<V,R,K,W>>
implements WindowFunction<T,R,K,W>

A WindowFunction that composes an AggregateFunction and WindowFunction. Upon invocation, this first applies AggregateFunction to the input, and then finally the WindowFunction to the single result element.

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.flink.api.common.functions.WrappingFunction

wrappedFunction

Constructor Summary

Constructors

Constructor	Description
AggregateApplyWindowFunction(AggregateFunction<T,ACC,V> aggFunction, WindowFunction<V,R,K,W> windowFunction)

Method Summary

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

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

close, getWrappedFunction, open, setRuntimeContext

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

getIterationRuntimeContext, getRuntimeContext

Methods inherited from class java.lang.Object

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

Constructor Detail

AggregateApplyWindowFunction

public AggregateApplyWindowFunction(AggregateFunction<T,ACC,V> aggFunction,
                                    WindowFunction<V,R,K,W> windowFunction)

Method Detail

apply

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

Description copied from interface: WindowFunction

Evaluates the window and outputs none or several elements.

Specified by:

apply in interface WindowFunction<K,W extends Window,T,ACC>

Parameters:

key - The key for which this window is evaluated.

window - The window that is being evaluated.

values - 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.