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

Class ProcessWindowFunction.Context

java.lang.Object

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

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

InternalProcessApplyWindowContext, InternalProcessWindowContext

Enclosing class:

ProcessWindowFunction<IN,OUT,KEY,W extends Window>

public abstract class ProcessWindowFunction.Context
extends Object
implements Serializable

The context holding window metadata.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
Context()

Method Summary

Modifier and Type	Method and Description
abstract long	currentProcessingTime() Returns the current processing time.
abstract long	currentWatermark() Returns the current event-time watermark.
abstract KeyedStateStore	globalState() State accessor for per-key global state.
abstract <X> void	output(OutputTag<X> outputTag, X value) Emits a record to the side output identified by the OutputTag.
abstract W	window() Returns the window that is being evaluated.
abstract KeyedStateStore	windowState() State accessor for per-key and per-window state.

Methods inherited from class java.lang.Object

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

Constructor Detail

Context

public Context()

Method Detail

window

public abstract W window()

Returns the window that is being evaluated.

currentProcessingTime

public abstract long currentProcessingTime()

Returns the current processing time.

currentWatermark

public abstract long currentWatermark()

Returns the current event-time watermark.

windowState

public abstract KeyedStateStore windowState()

State accessor for per-key and per-window state.

NOTE:If you use per-window state you have to ensure that you clean it up by implementing ProcessWindowFunction.clear(Context).

globalState

public abstract KeyedStateStore globalState()

State accessor for per-key global state.

output

public abstract <X> void output(OutputTag<X> outputTag,
                                X value)

Emits a record to the side output identified by the OutputTag.

Parameters:

outputTag - the OutputTag that identifies the side output to emit to.

value - The record to emit.