Re: sharing data structures between scripts (forms)

[Jonathan Vanasco <suppressed>]

Mark-

you can not ensure that in-memory structures will be processed by the  
same server/child, let alone be available to another script.

You'll need to find an inter-process store for your persistent item

if you're using something that provides for sessions ( ie  
Apache::Session ) you can just stuff the data in there.

Otherwise  Your best options are:
	an RDMBS
	a memcached store

If you are only using 1 server , you could use a local storage option:
	some shared db store ( like berkley db , or a dbm )
	a flat-file store
	a tied file
	one of the shared memory modules ( like FastMMap )

If you're only on 1 machine and can't use a session, i'd suggest  
using an rdbms like mysql, postgres or sqlite.  the advantage is that  
you can run a quick cronjob that deletes keys that have been inactive  
for 30minutes or so.

There is one ugly other option -- you could turn your data structures  
into a serialized form, and either enccypt or digitally sign them,  
and then have them sent back to the server and processed.  you see  
that a lot in asp pages.  its damn messy and causes a ton of excess  
bandwidth and processing power.  pages with 2k of content quickly  
have 130k of session data in them.    i'd highly recommend against it.

On May 23, 2007, at 6:12 PM, Mark Henry wrote:

> Hi,
>
> I've done a decent amount of work in a particular script which  
> reads a (flatfile) database, builds some data structures (hashes of  
> arrays of arrays) does some processing and spits out a form.
>
> I then want the user to choose some values on the form, submit it,  
> then I would act upon that, ultimately updating the original data  
> structure and writing out the mods - sounds pretty standard..
>
> My question is, if I choose to handle the form submission  
> (action="...") via a second (etc. etc.) script, how do I ensure my  
> in-memory data structures will be available to that other script?
>
> I'm new to cgi/mod-perl, though I gather one could submit back to  
> the same script - though this sounds like a pretty unscalable  
> operation over the long haul, that is having *all* code in one script.
>
> Can someone point me down the right path?  I have a feeling  
> packages might have something to do with it - all my variables/ 
> structures are lexically scoped as is..
>
> I apologize if this is not the right forum, but I am using mod_perl!
>
> Many thanks,
>
> Happy Star Wars 30th!
>
> -Mark

// Jonathan Vanasco

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