org.apache.flink.streaming.runtime.operators.windowing.functions

Class InternalWindowFunction<IN,OUT,KEY,W extends Window>

java.lang.Object

org.apache.flink.streaming.runtime.operators.windowing.functions.InternalWindowFunction<IN,OUT,KEY,W>

Type Parameters:

IN - The type of the input value.

OUT - The type of the output value.

KEY - The type of the key.

All Implemented Interfaces:

Serializable, org.apache.flink.api.common.functions.Function, OutputTypeConfigurable<OUT>

Direct Known Subclasses:

InternalIterableAllWindowFunction, InternalIterableWindowFunction, InternalSingleValueAllWindowFunction, InternalSingleValueWindowFunction

public abstract class InternalWindowFunction<IN,OUT,KEY,W extends Window>
extends Object
implements org.apache.flink.api.common.functions.Function, Serializable, OutputTypeConfigurable<OUT>

Internal interface for functions that are evaluated over keyed (grouped) windows.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
InternalWindowFunction()

Method Summary

Modifier and Type	Method and Description
abstract void	apply(KEY key, W window, IN input, org.apache.flink.util.Collector<OUT> out) Evaluates the window and outputs none or several elements.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.flink.streaming.api.operators.OutputTypeConfigurable

setOutputType

Constructor Detail

InternalWindowFunction

public InternalWindowFunction()

Method Detail

apply

public abstract void apply(KEY key,
                           W window,
                           IN input,
                           org.apache.flink.util.Collector<OUT> out)
                    throws Exception

Evaluates the window and outputs none or several elements.

Parameters:

key - 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.

Throws:

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