'Returns a sorted slice from the storage
:param key: the key at which the feed is stored'

def get_slice(self, key, start, stop, filter_kwargs=None, ordering_args=None):

    activities_data = self.get_slice_from_storage(key, start, stop, filter_kwargs=filter_kwargs, ordering_args=ordering_args)
    activities = []
    if activities_data:
        serialized_activities = list(zip(*activities_data))[1]
        activities = self.deserialize_activities(serialized_activities)
    self.metrics.on_feed_read(self.__class__, len(activities))
    return activities
