:return: the Ariane gears cache size defined by InjectorCachedGearService.cache_id

def get_gears_cache_size():
        """
        :return: the Ariane gears cache size defined by InjectorCachedGearService.cache_id
        """
        LOGGER.debug("InjectorCachedGearService.get_gears_cache_size")
        ret = None
        args = {'properties': {'OPERATION': 'COUNT_GEARS_CACHE',
                               'CACHE_ID': InjectorCachedGearService.cache_id}}

        result = InjectorCachedGearService.requester.call(args).get()
        if result.rc == 0:
            ret = int(result.response_content)
        else:
            err_msg = 'InjectorCachedGearService.get_gears_cache_size - Problem while getting gears cache size' + \
                      'Reason: ' + str(result.response_content) + '-' + str(result.error_message) + \
                      " (" + str(result.rc) + ")"
            LOGGER.warning(err_msg)
        return ret