@classmethod
def get_activity_storage(cls):
    """
        Returns an instance of the activity storage
        """
    options = {}
    options['serializer_class'] = cls.activity_serializer
    options['activity_class'] = cls.activity_class
    if cls.activity_storage_class is not None:
        activity_storage = cls.activity_storage_class(**options)
        return activity_storage
