Trigger.OnMergeContext (Google Cloud Dataflow SDK 1.9.1 API)

Google Cloud Dataflow SDK for Java, version 1.9.1

Warning: Dataflow SDK 1.x for Java is unsupported as of October 16, 2018. See Migrating from Dataflow SDK 1.x for Java for migration guidance.

Note: If you are using Cloud Dataflow SDK version 2.x, see the Apache Beam API reference documentation.

com.google.cloud.dataflow.sdk.transforms.windowing

Class Trigger.OnMergeContext

• java.lang.Object
• • com.google.cloud.dataflow.sdk.transforms.windowing.Trigger.TriggerContext
  • • com.google.cloud.dataflow.sdk.transforms.windowing.Trigger.OnMergeContext

• Enclosing class:

  Trigger<W extends BoundedWindow>

  ---

  
  

  public abstract class Trigger.OnMergeContext
  extends Trigger.TriggerContext

  Extended Trigger.TriggerContext containing information accessible to the Trigger.onMerge(com.google.cloud.dataflow.sdk.transforms.windowing.Trigger<W>.OnMergeContext) operational hook.

• • Constructor Summary

    Constructors 

    Constructor and Description
    OnMergeContext()

  • Method Summary

    All Methods Instance Methods Abstract Methods 

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

    • Methods inherited from class com.google.cloud.dataflow.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,
                                    com.google.cloud.dataflow.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(com.google.cloud.dataflow.sdk.util.ExecutableTrigger<W> trigger)

      Create an OnMergeContext for executing the given trigger.

      Specified by:

      forTrigger in class Trigger.TriggerContext

    • state

      public abstract com.google.cloud.dataflow.sdk.util.state.MergingStateAccessor<?,W> 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<W> trigger()

      Description copied from class: Trigger.TriggerContext
      Returns the interface for accessing trigger info.

      Specified by:

      trigger in class Trigger.TriggerContext