On 12/10/14, Oleg Broytman <p...@phdru.name> wrote: > Hi! > > On Wed, Dec 10, 2014 at 12:47:17AM +0100, "Fetchinson ." > <fetchin...@googlemail.com> wrote: >> What's the best strategy for some kind of caching of an expensive >> property? >> >> Let's say I have the following: >> >> class obj( SQLObject ): >> somefield = StringCol( ) >> someotherfield = StringCol( ) >> >> def _get_expensivestuff( self ): >> # takes a long time >> return result >> >> And if my obj instance is alive for a long time and expensivestuff >> gets accessed many times I'd like to just compute result once, store >> it somewhere (where?) and return it from there. >> >> I'm aware of memoizing the result of a function using a suitable >> decorator but I'm concerned about thread safety and I'm not terribly >> knowledgeable about the internals of sqlobject. >> >> Any ideas would help a lot. Thanks, >> Daniel > > I hope you know that SQLObject converts _get_* and _set_* methods to > properties so you shouldn't decorate the methods.
Sure! I really like this feature of SQLObject. > Also most caching > decorators are not thread-safe so you'd better implement your own > caching with proper locking. Well, that was exactly the question, how would I do that? :) Precisely for the reason you mention above I was wary of using a more or less standard caching decorator. Can't I attach the computed value to the instance itself somehow by setting a new property? Cheers, Daniel > Oleg. > -- > Oleg Broytman http://phdru.name/ p...@phdru.name > Programmers don't die, they just GOSUB without RETURN. > > ------------------------------------------------------------------------------ > Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server > from Actuate! Instantly Supercharge Your Business Reports and Dashboards > with Interactivity, Sharing, Native Excel Exports, App Integration & more > Get technology previously reserved for billion-dollar corporations, FREE > http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk > _______________________________________________ > sqlobject-discuss mailing list > sqlobject-discuss@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/sqlobject-discuss > -- Psss, psss, put it down! - http://www.cafepress.com/putitdown ------------------------------------------------------------------------------ Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration & more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk _______________________________________________ sqlobject-discuss mailing list sqlobject-discuss@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sqlobject-discuss
