Perrin Harkins wrote:
> valerian wrote:
>
>> So the weird thing is that it runs fine the first time, but when I
>> reload the page, it doesn't show the variable I imported from
>> My::Config
>
>
> Try changing this:
>
> use My::Config;
>
> to this:
>
> require My::Config;
> import My::Config;
>
> BEGIN blocks are only run once in PerlRun/Registry, and PerlRun clears
> the current namespace after each request, erasing the aliases created by
> import.
> Of course I can't explain why this worked for Stas. Maybe there is
> something about the specific versions of Perl/mod_perl that affects this.
I think I've had enough coffee. PerlRun recompiles the code on each
request, meaning that it re-runs any BEGIN blocks on each request.
Meaning that My::Config will re-import %CF afresh.
It's simply to check, add to your script:
BEGIN { warn "BEGIN was called\n"; }
you will see the message on every reload.
Since use is almost the same as: require+import. require won't be called
because the module will be already in %INC, but import will be always
called. Again it's simply to check. Add to My::Config:
sub import { warn "import was called" }
and don't inherit from Exporter. Again you will see import() called on
each request.
> In general, you'd be better off just avoiding aliases and
> Exporter altogether, since they waste memory and can cause confusion.
Seconded. See
http://perl.apache.org/docs/general/perl_reference/perl_reference.html#Using_Global_Variables_and_Sharing_Them_Between_Modules_Packages
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