Usage

The simplest use is by using it as a context manager:

with NonBlockingLock.objects.acquire_lock(obj=model_obj):
    model_obj.do_something()

Or you can keep track of the lock yourself:

try:
    lock = NonBlockingLock.objects.acquire_lock(obj=model_obj)
except AlreadyLocked:
    return False

model_obj.do_something()
lock.release()

If you have no Django model, or you want to be able to specify the lock name yourself, you can do that too:

# this will raise AlreadyLocked, if it's locked
lock = NonBlockingLock.objects.acquire_lock(lock_name='my_lock')
do_something()
lock.release()

Note that locks can expire automatically. There is a LOCK_MAX_AGE settings where you can specify a default lock release value for locks in your entire Django codebase. This value can be overridden per lock by setting the max_age parameter.

Test

You can run the tests with

tox

Releases

v2.0.0:

Merging of master and pre-django-1.8 branches Removes management command in favor of a celery task

v1.2.1:

Fix problem in migration to UUIDField for PostGres

v1.2.0:

Move id to UUIDField, add code quality checks and CI

v1.1.0:

Rename model to NonBlockingLock and add additional features

v1.0.1:

Corrected tests and code clean-up

v1.0.0:

Intial release.