org.apache.beam.sdk.transforms

Annotation Type DoFn.NewTracker

@Documented
 @Retention(value=RUNTIME)
 @Target(value=METHOD)
 @Experimental(value=SPLITTABLE_DO_FN)
public static @interface DoFn.NewTracker

Annotation for the method that creates a new RestrictionTracker for the restriction of a splittable DoFn.

Signature: MyRestrictionTracker newTracker(RestrictionT restriction, <optional arguments>); where MyRestrictionTracker must be a subtype of RestrictionTracker<RestrictionT>.

The optional arguments are allowed to be:

• If one of its arguments is tagged with the DoFn.Timestamp annotation, then it will be passed the timestamp of the current element being processed; the argument must be of type Instant.
• If one of its arguments is a subtype of BoundedWindow, then it will be passed the window of the current element. When applied by ParDo the subtype of BoundedWindow must match the type of windows on the input PCollection. If the window is not accessed a runner may perform additional optimizations.
• If one of its arguments is of type PaneInfo, then it will be passed information about the current triggering pane.
• If one of the parameters is of type PipelineOptions, then it will be passed the options for the current pipeline.