Returns the data that is between the offsets (start
, end
].
Returns the data that is between the offsets (start
, end
]. When start
is None
then
the batch should begin with the first available record. This method must always return the
same data for a particular start
and end
pair.
Returns the maximum available offset for this source.
Returns the maximum available offset for this source.
Stop this source and free any resources it has allocated.
Stop this source and free any resources it has allocated.