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

Class ReduceApplyProcessWindowFunction<K,W extends Window,T,R>

java.lang.Object

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

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

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

All Implemented Interfaces:

Serializable, org.apache.flink.api.common.functions.Function, org.apache.flink.api.common.functions.RichFunction

@Internal
public class ReduceApplyProcessWindowFunction<K,W extends Window,T,R>
extends ProcessWindowFunction<T,R,K,W>

Internal ProcessWindowFunction 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

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.flink.streaming.api.functions.windowing.ProcessWindowFunction

ProcessWindowFunction.Context

Constructor Summary

Constructors

Constructor	Description
ReduceApplyProcessWindowFunction(org.apache.flink.api.common.functions.ReduceFunction<T> reduceFunction, ProcessWindowFunction<T,R,K,W> windowFunction)

Method Summary

Modifier and Type	Method	Description
void	clear(ProcessWindowFunction<T,R,K,W>.Context context)	Deletes any state in the Context when the Window expires (the watermark passes its maxTimestamp + allowedLateness).
void	close()
void	open(org.apache.flink.api.common.functions.OpenContext openContext)
void	process(K k, ProcessWindowFunction<T,R,K,W>.Context context, Iterable<T> input, org.apache.flink.util.Collector<R> out)	Evaluates the window and outputs none or several elements.
void	setRuntimeContext(org.apache.flink.api.common.functions.RuntimeContext t)

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 Details

ReduceApplyProcessWindowFunction

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

Method Details

process

public void process(K k,
 ProcessWindowFunction<T,R,K,W>.Context context,
 Iterable<T> input,
 org.apache.flink.util.Collector<R> out)
             throws Exception

Description copied from class: ProcessWindowFunction

Evaluates the window and outputs none or several elements.

Specified by:

process in class ProcessWindowFunction<T,R,K,W extends Window>

Parameters:

k - The key for which this window is evaluated.

context - The context in which the window 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.

clear

public void clear(ProcessWindowFunction<T,R,K,W>.Context context)
           throws Exception

Description copied from class: ProcessWindowFunction

Deletes any state in the Context when the Window expires (the watermark passes its maxTimestamp + allowedLateness).

Overrides:

clear in class ProcessWindowFunction<T,R,K,W extends Window>

Parameters:

context - The context to which the window is being evaluated

Throws:

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

open

public void open(org.apache.flink.api.common.functions.OpenContext openContext)
          throws Exception

Specified by:

open in interface org.apache.flink.api.common.functions.RichFunction

Overrides:

open in class org.apache.flink.api.common.functions.AbstractRichFunction

Throws:

Exception

close

public void close()
           throws Exception

Specified by:

close in interface org.apache.flink.api.common.functions.RichFunction

Overrides:

close in class org.apache.flink.api.common.functions.AbstractRichFunction

Throws:

Exception

setRuntimeContext

public void setRuntimeContext(org.apache.flink.api.common.functions.RuntimeContext t)

Specified by:

setRuntimeContext in interface org.apache.flink.api.common.functions.RichFunction

Overrides:

setRuntimeContext in class org.apache.flink.api.common.functions.AbstractRichFunction