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NAME
Apache::Singleton - Singleton class for mod_perl
SYNOPSIS
package Printer;
# default:
# Request for mod_perl env
# Process for non-mod_perl env
use base qw(Apache::Singleton);
package Printer::PerRequest;
use base qw(Apache::Singleton::Request);
package Printer::PerProcess;
use base qw(Apache::Singleton::Process);
DESCRIPTION
Apache::Singleton works the same as Class::Singleton, but with various
object lifetime (scope). See the Class::Singleton manpage first.
OBJECT LIFETIME
By inheriting one of the following sublasses of Apache::Singleton, you
can change the scope of your object.
Request
use base qw(Apache::Singleton::Request);
One instance for one request. Apache::Singleton will remove instance
on each request. Implemented using mod_perl "pnotes" API. In
mod_perl environment (where $ENV{MOD_PERL} is defined), this is the
default scope, so inheriting from Apache::Singleton would do the
same effect.
Process
use base qw(Apache::Singleton::Process);
One instance for one httpd process. Implemented using package
global. In non-mod_perl environment, this is the default scope, and
you may notice this is the same beaviour with Class::Singleton ;)
So you can use this module safely under non-mod_perl environment.
AUTHOR
Original idea by Matt Sergeant <matt@sergeant.org> and Perrin Harkins
<perrin@elem.com>.
Code by Tatsuhiko Miyagawa <miyagawa@bulknews.net>.
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
SEE ALSO
the Apache::Singleton::Request manpage, the Apache::Singleton::Process
manpage, the Class::Singleton manpage
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