Package org.apache.flink.table.runtime.operators.window.groupwindow.triggers

Class ProcessingTimeTriggers

java.lang.Object

org.apache.flink.table.runtime.operators.window.groupwindow.triggers.ProcessingTimeTriggers

public class ProcessingTimeTriggers
extends Object

A Trigger that reacts to processing-time timers. The behavior can be one of the following:

• fire when the processing time passes the end of the window (afterEndOfWindow()),
• fire when the processing time advances by a certain interval after reception of the first element after the last firing for a given window (every(Duration)).

In the first case, the trigger can also specify an early trigger. The early trigger will be responsible for specifying when the trigger should fire in the period between the beginning of the window and the time when the processing time passes the end of the window.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static final class	ProcessingTimeTriggers.AfterEndOfWindow<W extends Window>	A Trigger that fires once the current system time passes the end of the window to which a pane belongs.
static final class	ProcessingTimeTriggers.AfterEndOfWindowNoLate<W extends Window>	A composite Trigger that consist of AfterEndOfWindow and a early trigger.
static final class	ProcessingTimeTriggers.AfterFirstElementPeriodic<W extends Window>	Trigger every a given interval, the first trigger time is interval after the first element in the pane.

Method Summary

Modifier and Type	Method	Description
static <W extends Window> ProcessingTimeTriggers.AfterEndOfWindow<W>	afterEndOfWindow()	Creates a trigger that fires when the processing time passes the end of the window.
static <W extends Window> ProcessingTimeTriggers.AfterFirstElementPeriodic<W>	every(Duration time)	Creates a trigger that fires by a certain interval after reception of the first element.

Methods inherited from class java.lang.Object

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

Method Details

afterEndOfWindow

public static <W extends Window>
ProcessingTimeTriggers.AfterEndOfWindow<W> afterEndOfWindow()

Creates a trigger that fires when the processing time passes the end of the window.

every

public static <W extends Window>
ProcessingTimeTriggers.AfterFirstElementPeriodic<W> every(Duration time)

Creates a trigger that fires by a certain interval after reception of the first element.

Parameters:

time - the certain interval