org.apache.beam.sdk.transforms.windowing

Class Trigger.OnMergeContext

java.lang.Object

org.apache.beam.sdk.transforms.windowing.Trigger.TriggerContext

org.apache.beam.sdk.transforms.windowing.Trigger.OnMergeContext

Enclosing class:

Trigger

public abstract class Trigger.OnMergeContext
extends Trigger.TriggerContext

Extended Trigger.TriggerContext containing information accessible to the Trigger.onMerge(org.apache.beam.sdk.transforms.windowing.Trigger.OnMergeContext) operational hook.

Constructor Summary

Constructors

Constructor and Description
OnMergeContext()

Method Summary

Modifier and Type	Method and Description
abstract Trigger.OnMergeContext	forTrigger(org.apache.beam.sdk.util.ExecutableTrigger trigger) Create an OnMergeContext for executing the given trigger.
abstract void	setTimer(Instant timestamp, org.apache.beam.sdk.util.TimeDomain domain) Sets a timer to fire when the watermark or processing time is beyond the given timestamp.
abstract org.apache.beam.sdk.util.state.MergingStateAccessor<?,?>	state() Returns the interface for accessing persistent state.
abstract Trigger.MergingTriggerInfo	trigger() Returns the interface for accessing trigger info.

Methods inherited from class org.apache.beam.sdk.transforms.windowing.Trigger.TriggerContext

currentEventTime, currentProcessingTime, currentSynchronizedProcessingTime, deleteTimer, window

Methods inherited from class java.lang.Object

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

Constructor Detail

OnMergeContext

public OnMergeContext()

Method Detail

setTimer

public abstract void setTimer(Instant timestamp,
                              org.apache.beam.sdk.util.TimeDomain domain)

Sets a timer to fire when the watermark or processing time is beyond the given timestamp. Timers are not guaranteed to fire immediately, but will be delivered at some time afterwards.

As with state(), timers are implicitly scoped to the current window. All timer firings for a window will be received, but the implementation should choose to ignore those that are not applicable.

Parameters:

timestamp - the time at which the trigger should be re-evaluated

domain - the domain that the timestamp applies to

forTrigger

public abstract Trigger.OnMergeContext forTrigger(org.apache.beam.sdk.util.ExecutableTrigger trigger)

Create an OnMergeContext for executing the given trigger.

Specified by:

forTrigger in class Trigger.TriggerContext

state

public abstract org.apache.beam.sdk.util.state.MergingStateAccessor<?,?> state()

Description copied from class: Trigger.TriggerContext

Returns the interface for accessing persistent state.

Specified by:

state in class Trigger.TriggerContext

trigger

public abstract Trigger.MergingTriggerInfo trigger()

Description copied from class: Trigger.TriggerContext

Returns the interface for accessing trigger info.

Specified by:

trigger in class Trigger.TriggerContext