def get_resource(self, resource_id='', params=None):
        """Return the value of the given resource parameter.
        """
        res_type = self._get_resource_type(resource_id)
        if self._has_agent(res_type):
            rac = ResourceAgentClient(resource_id=resource_id)
            return rac.get_resource(resource_id=resource_id, params=params)

        res_interface = self._get_type_interface(res_type)

        get_result = {}
        for param in params:
            getter = get_safe(res_interface, "params.%s.get" % param, None)
            if getter:
                get_res = self._call_getter(getter, resource_id, res_type)
                get_result[param] = get_res
            else:
                get_result[param] = None

        return get_result
    def get_resource(self, resource_id='', params=None):
        """Return the value of the given resource parameter.
        """
        res_type = self._get_resource_type(resource_id)
        if self._has_agent(res_type):
            rac = ResourceAgentClient(resource_id=resource_id)
            return rac.get_resource(resource_id=resource_id, params=params)

        res_interface = self._get_type_interface(res_type)

        get_result = {}
        for param in params:
            getter = get_safe(res_interface, "params.%s.get" % param, None)
            if getter:
                get_res = self._call_getter(getter, resource_id, res_type)
                get_result[param] = get_res
            else:
                get_result[param] = None

        return get_result