def pause(self):
"""
暂停状态机
:return: None
:raises EStatusMismatch: 状态不匹配
"""
if self._status == self.Status.RUNNING:
self._status = self.Status.PAUSED
else:
raise exception.EStatusMismatch(
"Only in running status can call this method. "
"current status:{}".format(self._status))
def resume(self):
"""
恢复状态机
:return: None
:raises EStatusMismatch: 状态不匹配
"""
if self._status == self.Status.PAUSED:
self._status = self.Status.RUNNING
else:
raise exception.EStatusMismatch(
"Only in paused status can call this method."
"current status:{}".format(self._status))
def prepare(self):
"""
状态机创建之后初次检查, 并设置当前状态节点
:return: None
:raises EUnInited: 未初始化
:raises EStatusMismatch: 状态不匹配
"""
if self._status != self.Status.CREATED \
and self._status != self.Status.INITED:
raise exception.EStatusMismatch(
"Only in created or inited status can call "
"this method.current status:{}".format(self._status))
if not self._nodes:
raise exception.EUnInited("nodes list length is 0")
self.status = self.Status.INITED
self._current_node = self._nodes[0].name
def start(self):
"""
启动状态机
:return: None
:raises EStatusMismatch: 状态不匹配
:raises Exception: 通用异常
"""
self.prepare()
if self._status == self.Status.INITED \
or self._status == self.Status.PAUSED:
self._status = self.Status.RUNNING
else:
raise exception.EStatusMismatch(
"Only in inited or paused status can call "
"this method.current status:{}".format(self._status))
while self._status == self.Status.RUNNING:
try:
self.run_next()
except Exception as e:
self._status = self.Status.FAILED
raise e