public static @interface DoFn.GetInitialRestriction
This method must satisfy the following constraints:
RestrictionT defines the restriction type used within this
splittable DoFn. All other methods that use a
must use the same type that is used here. It is suggested to use as narrow of a return
type definition as possible (for example prefer to use a square type over a shape type as
a square is a type of a shape).
DoFn.Element annotation, then it will be
passed the current element being processed; the argument must be of type
Note that automatic conversion of
DoFn.FieldAccess parameters are
DoFn.Timestamp annotation, then it will be
passed the timestamp of the current element being processed; the argument must be of type
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.
PaneInfo, then it will be passed information
about the current triggering pane.
PipelineOptions, then it will be passed the
options for the current pipeline.