[Koha-devel] Re: FAQ: Why am I prompted to save a .pl file? was: Problems adding a biblio...

[Rick Welykochy]

MJ Ray wrote:

> So by exceptions, you did not mean exceptions as such.  Thanks for
> clarifying.

I meant fatal errors raised as exceptions via die().
This is how all fatals are handled in perl.


> The manual entry for die suggests using Carp, which is what I
> suggested too.  Using core perl modules seems far safer than relying
> on everyone remembering on wrapping everything that can go wrong in an
> appropriate eval{}.  Sod's law says that an error would occur outside
> the eval{} anyway.

The "perldoc -f die" entry does not mention Carp.

Carp provides better formatting of message sent via die:

   "The Carp routines are useful in your own modules because
    they act like die() or warn(), but with a message which
    is more likely to be useful to a user of your module."

i.e. Carp is for terminating (via croak or confess)
or warning (via carp or cluck) in a "nicer way", to be
used for the benefit of CLIENTS of the software you are writing.



> I'm slightly scared that you have re-invented that wheel and then used
> that re-invention in large-scale ecommerce systems.  Why aren't you
> using the Carp modules or something based on them?

Carp does not provide exception catching. That has to be implemented
by the application writer.

Carp does not provide the functionality I have demonstrated at

   http://praxis.com.au/demo_error.pl/showio

which intercepts an IO error, and displays detailed information to
the browser in addition to notifying the sysadmin.

The demo_error.pl example intercepts ALL errors and works for all
perl applications :)



cheers
rickw




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