Look at idea behind this: http://code.djangoproject.com/wiki/CookBookThreadlocalsAndUser
On Feb 14, 6:40 pm, Amit Ramon <[EMAIL PROTECTED]> wrote: > Hello, > > I'm developing a site that need to display ads. The ad to display on a page > is selected by a function based on the value of a global state - an > application state that need to be maintained across requests and different > users. In other words, the state is a "website singleton". > > This state is read and changed on every request. One trivial way to achive > this is to store the state in the database, but I'm afraid that changing the > value in the database with every request might create a performance > bottleneck (I'm using MySql, don't know if it matters). > > I thought about having a global (plain python) variable to store the state. > However, there are some points to think about, especially since I'm not sure > how FastCGI works: > 1. Is there single process that handles all the requests? (so it can keep > state) > 2. If so, are different requests handles by separate threads? If this is > true, then I probably need to make this state variable thread-safe. > 3. How long does the FastCGI process (or the relevant application process) > lives? I don't mind reseting the state from time to time, but not too often. > > The ad selection mechanism is somewhat probabilstic - ads should be displayed > more or less randomly (with some uniform or weighted distribution), so > another option I'm thinking of is using python's random() function to select > an ad. That way I won't have to maintian state explicitly, although a state > would be maintained by python for the random number generator. This also > raises some questions: again, to make this work well there need to be a > single server process, the random number generator (or its state) need to be > global. > > I hope this is not too long, and clear enough. I would appreciate any ideas. > > Thanks, > > Amit Ramon --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
