flink-scala-api
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flink-scala-api/org.apache.flinkx.api/org.apache.flinkx.api.function/WindowFunction

WindowFunction

org.apache.flinkx.api.function.WindowFunction
@Public
trait WindowFunction[IN, OUT, KEY, W <: Window] extends Function, Serializable

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

Type parameters

IN

The type of the input value.

KEY

The type of the key.

OUT

The type of the output value.

Attributes

Graph
Supertypes
trait Function
trait Serializable
class Object
trait Matchable
class Any
Known subtypes
class RichWindowFunction[IN, OUT, KEY, W]

Members list

Value members

Abstract methods

def apply(key: KEY, window: W, input: Iterable[IN], out: Collector[OUT]): Unit

Evaluates the window and outputs none or several elements.

Evaluates the window and outputs none or several elements.

Value parameters

input

The elements in the window being evaluated.

key

The key for which this window is evaluated.

out

A collector for emitting elements.

window

The window that is being evaluated.

Attributes

Throws
Exception

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

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