@classmethod
def update_source_instance_status(cls, source_instance, status_ok, oldnew_check
    ):
    """ Updates state on given source_instance
            Returns True if source_instance have triggered a value change
        """
    value = source_instance.get
    stime = source_instance.source_time
    return cls.update_source_instance_value(source_instance, value, stime,
        status_ok, oldnew_check)
