问题陈述:
我正在尝试添加一个方法 ( Test::start()
),scheduler.add_date_job()
该方法被配置为将作业存储在SQLAlchemyJobStore
作业商店中。将作业添加到作业存储成功。但是当我尝试启动调度程序时,obj_to_ref
(in apscheduler/util.py
) 无法获取ref_to_obj()
给定对象的 [在这种情况下,给定对象是Test::start()
- 换句话说,<bound method Test.start of <__main__.Test instance at 0xa119a6c>>
]。
但是在以下情况下,相同的操作可以正常工作:
- 其他作业存储(fe
RAMJobStore
- 这是未添加/配置作业存储时的默认设置)。 - 当
scheduler.add_date_job()
使用其他函数(func
下面代码中的 fe)而不是像Test::start()
(作业商店是SQLAlchemyJobStore
)[theref_to_obj()
andobj_to_ref()
forfunc
is<function func at 0xb768ed14>
] 之类的方法调用时。我添加了一些调试(在 中apscheduler/util.py
)以确认相同。
代码如下:
from apscheduler.scheduler import Scheduler as scheduler
from datetime import datetime, date, time, timedelta
import time
import logging
logging.basicConfig(filename='/tmp/log', level=logging.DEBUG,
format='[%(asctime)s]: %(levelname)s : %(message)s')
class Failed(Exception):
def __str__(self):
return 'Failed!!'
# APScheduler Configure Options
_g_aps_default_config = {
'apscheduler.standalone' : True,
'apscheduler.jobstore.default.class' : 'apscheduler.jobstores.sqlalchemy_store:SQLAlchemyJobStore',
'apscheduler.jobstore.default.url' : 'mysql://root:root123@localhost/jobstore',
'apscheduler.jobstore.default.tablename' : 'mytable'
}
class Test:
def __init__(self, *args, **kwargs):
self.scheduler = scheduler(_g_aps_default_config)
self.__running = False
# Intentionally don't want to start!!
self.__dont_start = True
self.__retry_count = 0
self.__start_max_retries = 5
def start(self):
try:
# Try to start here!
# Intentionally don't want to start for the first 5 times
if self.__retry_count < self.__start_max_retries:
self.__retry_count += 1
raise Failed
if self.__running:
raise Failed
self.__running = True
print 'started successfully :)'
except Failed:
# log the start failure and reschedule the start()
print 'attempt (#%d): unable to start now.. ' \
'so rescheduling to start after 5 seconds' % self.__retry_count
alarm_time = datetime.now() + timedelta(seconds=5)
self.scheduler.add_date_job(self.start, alarm_time)
self.scheduler.start()
def func():
print 'this is a func and not a method!!!'
if __name__ == '__main__':
t = Test()
t.start()
while True:
time.sleep(10)
t.stop()
堆栈跟踪如下:
Traceback (most recent call last):
File "user1.py", line 55, in <module>
t.start()
File "user1.py", line 48, in start
self.scheduler.start()
File "/usr/lib/python2.7/site-packages/APScheduler-2.1.0-py2.7.egg/apscheduler/scheduler.py", line 109, in start
self._real_add_job(job, jobstore, False)
File "/usr/lib/python2.7/site-packages/APScheduler-2.1.0-py2.7.egg/apscheduler/scheduler.py", line 259, in _real_add_job
store.add_job(job)
File "/usr/lib/python2.7/site-packages/APScheduler-2.1.0-py2.7.egg/apscheduler/jobstores/sqlalchemy_store.py", line 58, in add_job
job_dict = job.__getstate__()
File "/usr/lib/python2.7/site-packages/APScheduler-2.1.0-py2.7.egg/apscheduler/job.py", line 120, in __getstate__
state['func_ref'] = obj_to_ref(self.func)
File "/usr/lib/python2.7/site-packages/APScheduler-2.1.0-py2.7.egg/apscheduler/util.py", line 174, in obj_to_ref
raise ValueError('Cannot determine the reference to %s' % repr(obj))
ValueError: Cannot determine the reference to <bound method Test.start of <__main__.Test instance at 0xa119a6c>>
我添加的调试apscheduler/util.py
如下:
161 def obj_to_ref(obj):
162 """
163 Returns the path to the given object.
164 """
165 ref = '%s:%s' % (obj.__module__, get_callable_name(obj))
166 print 'obj_to_ref : obj : %s' % obj
167 print 'obj_to_ref : ref : %s' % ref
168 try:
169 obj2 = ref_to_obj(ref)
170 print 'obj_to_ref : obj2 : %s' % obj2
171 if obj != obj2:
172 raise ValueError
173 except Exception:
174 raise ValueError('Cannot determine the reference to %s' % repr(obj))
175
176 return ref
以下是 的调试打印Test::start()
:
obj_to_ref : obj : <bound method Test.start of <__main__.Test instance at 0xa119a6c>>
obj_to_ref : ref : __main__:Test.start
obj_to_ref : obj2 : <unbound method Test.start>
将 更改scheduler.add_date_job()
为function
(fe func
) 而不是method
(fe Test::start()
)
self.scheduler.add_date_job(func, alarm_time)
以下是 的调试打印func()
:
obj_to_ref : obj : <function func at 0xb768ed14>
obj_to_ref : ref : __main__:func
obj_to_ref : obj2 : <function func at 0xb768ed14>
我在这里做错了吗?还是这是apscheduler/util.py
函数 wrt中的错误SQLAlchemyJobStore
?
任何已知的解决方法?!