On Mon, 2008-10-13 at 19:18 -0700, Lifto wrote: > > Greetings Django Users, > > How do you control the initialization of your Django process? Do you > rely exclusively on Python's module-loading to initialize your > namespaces and reusable resource-connections?
Since modules can be (and are) loaded multiple times, that won't work. > I would like to perform initialization of certain features in my > Django project exactly once when the Django process is started, after > Django has initialized. Is there a best practice for doing this? I am > having difficulties because I am relying on Python's module loading > system (top-level __init__.py file) to perform my initialization. I > feel it would be, among other conveniences, more explicit to specify > an initialization procedure than to depend on module loading. There's an open ticket to add support for functions that are called after settings have been imported by before anything further is executed. However, that still won't solve your "once and only once" problem, since each thread of execution (be it an actual thread or multiple processes) will do this. Similarly, there will be process restarts caused by the webserver (perfectly normal behaviour, too. Apache, amongst others, kills child processes every N requests to avoid any inadvertent memory leaks). > > I attempted to solve my issue by using Python globals to ensure my > initialization is idempotent, but it seems that Django (or just > manage.py?) munges with Python globals behind-the scenes. This is a very fuzzy statement and not particularly accurate as written Neither Python nor Django does anything special to globals. What do you actually mean? I suspect that you're simply seeing that modules aren't simply imported once, but without any idea of what you're trying to do, it's hard to say. If you want something to happen once, you have to use an external synchronisation mechanism so that all the execution processes can synchronise on the same thing. Lock files are a particularly good way to do this -- that's how your system manages to only start one each of various services, for example. Regards, Malcolm --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~----------~----~----~----~------~----~------~--~---
