On Thu, Feb 5, 2015 at 2:50 PM, Roberto De Ioris <[email protected]> wrote:
>
>> is there some way to restrict the signal to be registered only once?
>
> Put it in wsgi.py or place in a dedicated file you can import with
>
> --shared-pyimport file
thanks!
in this specific case i'd rather not import these functions too early,
since i need most of the Django environment running. I'm sure it can
be done with a little care, but it's not something i want to do right
now.
Since these periodic tasks can be quite long, but i don't want more
than one running at the same time, i did a simple decorator to ensure
non-overlapping execution. so now i don't care (too much) if the
signal is emitted too often.
my non-overlap decorator is simply:
def unique_on(name, lockdir='/tmp'):
fpath = os.path.join(lockdir, name)
def decorator(f):
@wraps(f)
def wrapper(*args, **kwargs):
with open(fpath, 'w+') as lockfile:
try:
flock(lockfile, LOCK_EX+LOCK_NB)
except IOError:
return
return f(*args, **kwargs)
return wrapper
return decorator
so now my scan function is like:
@timer(60)
@unique_on('scan')
def scan()
for hf in HotFolder.objects.filter(active=True):
.....
and now i'm sure i run only one scan process at a time.
--
Javier
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