I just got it working using the global variable (the first of your
suggestions). I did not know about Python's global statement, but that
did the trick. I just had to say:
final_graph = None
def graph_search(request):
global final_graph
if not final_graph:
final_graph = build_graph()
result = search_graph(final_graph, some_parameters_from_request)
return render_to_response('template.html',{'result': result})
Thanks again, Dan!
On Feb 13, 6:42 am, mickey ristroph <[EMAIL PROTECTED]> wrote:
> Dan-
>
> Thanks a lot for the ideas.
>
> I tried the first suggestion, but get an UnboundLocalError, local
> variable 'graph' referenced before assignment. Not sure how to fix
> this.
>
> I also tried the following:
>
> local_data = threading.local()
> local_data.__dict__.setdefault('graph', None)
> if not local_data.graph:
> local_data.graph = build_graph()
>
> But the graph is still rebuilt every time. This occurs through
> mod_python and FastCGI. I guess there is a seperate thread handling
> each request, so there is no persistence.
>
> I just wanted to give you an update on what I was trying. Thanks again
> for the suggestions. I'll post again when I figure it out.
>
> -Mickey
>
> On Feb 1, 4:16 am, Dan Fairs <[EMAIL PROTECTED]> wrote:
>
> > > Is there anyway I can make g persistent? In other words, I want to
> > > build it once, and then search that copy for each additional request.
>
> > If this thing doesn't change, then you could build it once and then
> > stick it in a module-level variable. Something like:
>
> > final_graph = None
>
> > def graph_search(request):
> > if not final_graph:
> > final_graph = build_graph()
> > result = search_graph(final_graph, some_parameters_from_request)
> > return render_to_response('template.html',{'result': result})
>
> > Note that this is a *very* naive implementation - you'll need some
> > locking around final_graph access to prevent race conditions. You
> > might want to consider using a thread-local storage. You'll also need
> > to unset this module-level variable (again with locking) if your
> > underlying graph data changes.
>
> > Cheers,
> > Dan
>
> > --
> > Dan Fairs <[EMAIL PROTECTED]> |http://www.stereoplex.com/
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