nova.service.Service
主要用于启动rpc服务，启动定时任务
create
以nova.service.Service.create方法为例：
# 父类为oslo_service.Service
@classmethod
def create(cls, host=None, binary=None, topic=None, manager=None,
report_interval=None, periodic_enable=None,
periodic_fuzzy_delay=None, periodic_interval_max=None):
# 相关配置检查
if not host:
host = CONF.host
if not binary:
binary = os.path.basename(sys.argv[0])
if not topic:
topic = binary.rpartition('nova-')[2]
if not manager:
# 为当前的wsgi服务配置对应的manager，manager中用来启动定时任务，或暴露endpoint服务端点
manager = SERVICE_MANAGERS.get(binary)
if report_interval is None:
report_interval = CONF.report_interval
if periodic_enable is None:
periodic_enable = CONF.periodic_enable
if periodic_fuzzy_delay is None:
periodic_fuzzy_delay = CONF.periodic_fuzzy_delay
debugger.init()
# 调用超类的构造方法
service_obj = cls(host, binary, topic, manager,
report_interval=report_interval,
periodic_enable=periodic_enable,
periodic_fuzzy_delay=periodic_fuzzy_delay,
periodic_interval_max=periodic_interval_max)
try:
utils.raise_if_old_compute()
except exception.TooOldComputeService as e:
if CONF.workarounds.disable_compute_service_check_for_ffu:
LOG.warning(str(e))
else:
raise
return service_obj2025/3/8大约 6 分钟