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

Class FoldApplyWindowFunction<K,W extends Window,T,ACC>

java.lang.Object

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

org.apache.flink.api.java.operators.translation.WrappingFunction<WindowFunction<ACC,ACC,K,W>>

org.apache.flink.streaming.api.functions.windowing.FoldApplyWindowFunction<K,W,T,ACC>

All Implemented Interfaces:

Serializable, org.apache.flink.api.common.functions.Function, org.apache.flink.api.common.functions.RichFunction, WindowFunction<T,ACC,K,W>, OutputTypeConfigurable<ACC>

@Internal
public class FoldApplyWindowFunction<K,W extends Window,T,ACC>
extends org.apache.flink.api.java.operators.translation.WrappingFunction<WindowFunction<ACC,ACC,K,W>>
implements WindowFunction<T,ACC,K,W>, OutputTypeConfigurable<ACC>

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
FoldApplyWindowFunction(ACC initialValue, org.apache.flink.api.common.functions.FoldFunction<T,ACC> foldFunction, WindowFunction<ACC,ACC,K,W> windowFunction)

Method Summary

Modifier and Type	Method and Description
void	apply(K key, W window, Iterable<T> values, org.apache.flink.util.Collector<ACC> out) Evaluates the window and outputs none or several elements.
void	open(org.apache.flink.configuration.Configuration configuration)
void	setOutputType(org.apache.flink.api.common.typeinfo.TypeInformation<ACC> outTypeInfo, org.apache.flink.api.common.ExecutionConfig executionConfig) Is called by the StreamGraph.addOperator(Integer, String, StreamOperator, TypeInformation, TypeInformation, String) method when the StreamGraph is generated.

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

close, getWrappedFunction, 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

FoldApplyWindowFunction

public FoldApplyWindowFunction(ACC initialValue,
                               org.apache.flink.api.common.functions.FoldFunction<T,ACC> foldFunction,
                               WindowFunction<ACC,ACC,K,W> windowFunction)

Method Detail

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.java.operators.translation.WrappingFunction<WindowFunction<ACC,ACC,K,W extends Window>>

Throws:

Exception

apply

public void apply(K key,
                  W window,
                  Iterable<T> values,
                  org.apache.flink.util.Collector<ACC> out)
           throws Exception

Description copied from interface: WindowFunction

Evaluates the window and outputs none or several elements.

Specified by:

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

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.

setOutputType

public void setOutputType(org.apache.flink.api.common.typeinfo.TypeInformation<ACC> outTypeInfo,
                          org.apache.flink.api.common.ExecutionConfig executionConfig)

Description copied from interface: OutputTypeConfigurable

Is called by the StreamGraph.addOperator(Integer, String, StreamOperator, TypeInformation, TypeInformation, String) method when the StreamGraph is generated. The method is called with the output TypeInformation which is also used for the StreamTask output serializer.

Specified by:

setOutputType in interface OutputTypeConfigurable<ACC>

Parameters:

outTypeInfo - Output type information of the StreamTask

executionConfig - Execution configuration