[Catalyst] Caching an expensive "global" calculation?

[Chris]

I use CHI (http://search.cpan.org/~jswartz/CHI-0.60/) for this sort of
thing, usually with CHI::Driver::File as this is only for the one server.

- Chris

On Sat, Apr 15, 2017 at 1:01 AM, tirveni yadav <yadav.tirveni at gmail.com>
wrote:

> On Wed, Apr 12, 2017 at 4:14 PM, Dr. Jennifer Nussbaum
> <bg271828 at yahoo.com> wrote:
> >
> > Hi,
> >
> > This may not be strictly Catalyst-related, but I'd be grateful for any
> help - I dont know much about
> > either caching or making things available throughout an app :-(
> >
> > I have an app that uses a number of different outside configuration
> files; which one it uses depends on
> > several factors, and it will be the same one per request cycle. Parsing
> each file is an expensive
> > calculation. Originally I read it at the beginning of the cycle and
> passed the resulting variable around,
> > but my models are now so complicated that this has gotten tedious, and I
> wanted to do something
> > like have a utility method MyApp::Utilities->get_outside_config($id)
> that any model can call when it
> > needs to. However, I dont want to have to recalculate it in every
> get_outside_config call.
> >
> > Whats the best way of handling this? The config is used very often, and
> could be regarded as global,
> > but also most of my models are non-Catalyst ones that are glued in, so
> $c isnt available to them. The
> > config files dont change often.
> >
>
> Caching is a good choice for this problem.
>
> Store result of your calculations as a hash in a fastmmap/redis.
> Do also store the timestamp in the hash.
>
> Use the hash for all your subsequent request.
> And, all of these requests check timestamp for staleness before
> deciding to use the hash or go for calculations again.
>
> Redis Hash operations.
>
> --
> Regards,
>
> Tirveni Yadav
> www.udyansh.org
>
> What is this Universe ? From what it arises ? Into what does it go?
> In freedom it arises, In freedom it rests and into freedom it melts away.
> Upanishads.
>
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