[Catalyst] Multiple instances of same app with 5.80 under mod_perl

[Tomas Doran]

Stuart Watt wrote:
> I did a simple tweak to the configuration file management so environment 
> variables could be substituted into configuration files. All I added to 
> MyApp.pm was:
<snip>
> Then, I could use YAML settings like:
> 
> session:
>   storage:       '__ENV(TEMP)__/sessions'
> 
> It was pretty easy for us to get web servers to set environment 
> variables, so this trick allowed us to have multiple systems with 
> different database and file directories set pretty straightforwardly.

That's a nice trick, it would be great to see it documented. Do you 
fancy writing up a wiki page, or adding something to the manual, or even 
patching ConfigLoader so that it supports a syntax like this by default?

> This may be one approach you could use, but there are likely better 
> ones. Especially since I'm still stuck at 5.70 waiting for a good 
> opportunity to upgrade without anyone (even my colleagues) noticing. 
> This is a 5.70 solution, but should be OK in 5.80, I would guess.

Yes, that'll work in 5.80, but still won't solve the issue at hand.

If you try to run multiple copies of the same application in the same 
perl process, it won't work like you expect - the setting will come from 
the first application loaded..

Your solution just makes it much easier to have multiple deployment 
environments with different configurations, but these environments still 
have to have a different perl interpreter each.

Cheers
t0m