Hi, Karen Tracey schrieb: > On Wed, Sep 30, 2009 at 1:49 PM, Gabriel Rossetti > <[email protected] <mailto:[email protected]>> wrote: > > > Why can't it be pickled? > > Because it has a socket open > > > Clearly, since every request is independent, > > if it really can't be pickled there is no way of passing it from one > > to the next. Could you store the necessary values to recreate the > > object? > > > > That is what I currently doing, but the object creation is expensive > which is why I was looking for another way. So I can't have some sort > of global dict that would store my objects and the key could be stored > in the session?
does the socket really need to be kept open? If it is the only item that prevents pickling the object consider using the __setstate__ and __getstate__ methods (s. http://docs.python.org/library/pickle.html#object.__getstate__ and http://docs.python.org/library/pickle.html#object.__setstate__ for details). For example delete the socket from the object's __dict__ in the __getstate__ method (called before the object is pickled) and place the parameters for socket recreation in the object's __dict__ so that they will get pickled. Return the object's __dict__ from this method. In __setstate__ (takes the unpickled __dict__ as parameter) get those parameters for the socket from the unpickled object's __dict__, recreate the socket and delete the parameters. Or is the socket creation the expensive action of this object. Then please forget what I have writte because it will not help you. Otherwise here are examples of possible __getstate__/__setstate__ methods for your case: def create_socket(self, socket_parameters): """Creates the socket with the given parameters""" def __getstate__(self): """Called when the object is pickled""" self.socket_parameters = parameters_for_recreation del self.socket return self.__dict__ def __setstate__(self, newstate): """Called when the object is unpickled""" self.__dict__ = newstate self.socket = self.create_socket(self.socket_parameters) del self.socket_parameters Hth with best regards Carsten -- Carsten Reimer Web Developer [email protected] Phone +49.228.42150.73 Galileo Press GmbH Rheinwerkallee 4 - 53227 Bonn - Germany Phone +49.228.42150.0 (Zentrale) .77 (Fax) http://www.galileo-press.de/ Managing Directors: Tomas Wehren, Ralf Kaulisch, Rainer Kaltenecker HRB 8363 Amtsgericht Bonn --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to [email protected] 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 -~----------~----~----~----~------~----~------~--~---
