Re: cache a object in modperl

If the database doesn't change very often, and you don't mind only 
getting updates to your database when you restart apache, and you're 
using prefork mod_perl, then you could use a startup.pl to load your 
database before apache forks, and get a shared copy globally in all your 
apache children.

https://perl.apache.org/docs/1.0/guide/config.html#The_Startup_File

This thread from 13 years ago seems to have a clear-ish example of how 
to use startup.pl to do what i'm talking about.

If you need it to update more frequently than when you restart apache, 
you could potentially use a PerlChildInitHandler to load the data when 
apache creates children.  This will use more memory, as each child will 
have it's own copy, and can also result in situation where children can 
have different versions of the database loaded and be serving requests 
at the same time.  If you want to go this way you might want to also add 
a MaxRequestsPerChild directive to your apache config to make sure that 
you're children die and get refreshed on the regular, if you don't 
already have one.

Adam


On 9/13/2020 10:51 PM, Wesley Peng wrote:
> Hello
>
> I am not so familiar with modperl.
>
> For work requirement, I need to access IANA TLD database.
>
> So I wrote this perl module:
> https://metacpan.org/pod/Net::IANA::TLD
>
> But, for each new() in the module, the database file will be 
> downloaded from IANA's website.
>
> I know this is pretty Inefficient.
>
> My question is, can I cache the new'ed object by modperl?
>
> If so, how to do?
>
> Thanks.