def __init__(self, name, status, result=None, context=None):
if not statuses.is_valid(status):
raise exc.InvalidStatus(status)
self.name = name
self.status = status
self.result = result
self.context = context
def is_transition_valid(cls, old_status, new_status):
if old_status is None:
old_status = 'null'
if new_status is None:
new_status = 'null'
if not statuses.is_valid(old_status):
raise exc.InvalidStatus(old_status)
if not statuses.is_valid(new_status):
raise exc.InvalidStatus(new_status)
if old_status not in TASK_STATE_MACHINE_DATA.keys():
return False
if old_status == new_status or new_status in TASK_STATE_MACHINE_DATA[old_status].values():
return True
return False
