def undo(self, job_set=taskhandle.NullJobSet()):
try:
done = []
for change in reversed(self.changes):
change.undo(job_set)
done.append(change)
except Exception:
for change in done:
change.do()
raise
def do(self, job_set=taskhandle.NullJobSet()):
try:
done = []
for change in self.changes:
change.do(job_set)
done.append(change)
self.time = time.time()
except Exception:
for change in done:
change.undo()
raise
def call(self, job_set=taskhandle.NullJobSet()):
job_set.started_job(str(self))
function(self)
job_set.finished_job()