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

Method Summary

Modifier and Type	Method and Description
void	clear(ProcessWindowFunction.Context context) Deletes any state in the Context when the Window is purged.
void	close()
void	open(org.apache.flink.configuration.Configuration configuration)
void	process(K k, ProcessWindowFunction.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 Detail

ReduceApplyProcessWindowFunction

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

Method Detail

process

public void process(K k,
                    ProcessWindowFunction.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.Context context)
           throws Exception

Description copied from class: ProcessWindowFunction

Deletes any state in the Context when the Window is purged.

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.configuration.Configuration configuration)
          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