Resurrector(3) User Contributed Perl Documentation Resurrector(3)NAMELog::Log4perl::Resurrector - Dark Magic to resurrect hidden L4p
statements
DESCRIPTION
Loading "use Log::Log4perl::Resurrector" causes subsequently loaded
modules to have their hidden
###l4p use Log::Log4perl qw(:easy);
###l4p DEBUG(...)
###l4p INFO(...)
...
statements uncommented and therefore 'resurrected', i.e. activated.
This allows for a module "Foobar.pm" to be written with Log4perl
statements commented out and running at full speed in normal mode.
When loaded via
use Foobar;
all hidden Log4perl statements will be ignored.
However, if a script loads the module "Foobar" after loading
"Log::Log4perl::Resurrector", as in
use Log::Log4perl::Resurrector;
use Foobar;
then "Log::Log4perl::Resurrector" will have put a source filter in
place that will extract all hidden Log4perl statements in "Foobar"
before "Foobar" actually gets loaded.
Therefore, "Foobar" will then behave as if the
###l4p use Log::Log4perl qw(:easy);
###l4p DEBUG(...)
###l4p INFO(...)
...
statements were actually written like
use Log::Log4perl qw(:easy);
DEBUG(...)
INFO(...)
...
and the module "Foobar" will indeed be Log4perl-enabled. Whether any
activated Log4perl statement will actually trigger log messages, is up
to the Log4perl configuration, of course.
There's a startup cost to using "Log::Log4perl::Resurrector" (all
subsequently loaded modules are examined) but once the compilation
phase has finished, the perl program will run at full speed.
Some of the techniques used in this module have been stolen from the
"Acme::Incorporated" CPAN module, written by chromatic. Long live CPAN!
COPYRIGHT AND LICENSE
Copyright 2002-2009 by Mike Schilli <m@perlmeister.com> and Kevin Goess
<cpan@goess.org>.
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
perl v5.14.1 2011-05-02 Resurrector(3)
