apache::singleton(3pm) [debian man page]

Apache::Singleton(3pm)					User Contributed Perl Documentation				    Apache::Singleton(3pm)

NAME

       Apache::Singleton - Singleton class for mod_perl

VERSION

       version 0.15

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 Class::Singleton 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.

	   NOTE: You need "PerlOptions +GlobalRequest" in your apache configuration in order to use the Request lifetime method.

       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.

CREDITS

       Original idea by Matt Sergeant <matt@sergeant.org> and Perrin Harkins <perrin@elem.com>.

       Initial implementation and versions 0.01 to 0.07 by Tatsuhiko Miyagawa <miyagawa@bulknews.net>.

SEE ALSO

       Apache::Singleton::Request, Apache::Singleton::Process, Class::Singleton

SOURCE

       The development version is on github at http://github.com/mschout/apache-singleton <http://github.com/mschout/apache-singleton> and may be
       cloned from git://github.com/mschout/apache-singleton.git <git://github.com/mschout/apache-singleton.git>

BUGS

       Please report any bugs or feature requests to bug-apache-singleton@rt.cpan.org or through the web interface at:
	http://rt.cpan.org/Public/Dist/Display.html?Name=Apache-Singleton

AUTHOR

       Michael Schout <mschout@cpan.org>

COPYRIGHT AND LICENSE

       This software is copyright (c) 2009 by Michael Schout.

       This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

perl v5.14.2							    2012-04-02						    Apache::Singleton(3pm)

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MakeMethods::Emulator::Singleton(3pm)			User Contributed Perl Documentation		     MakeMethods::Emulator::Singleton(3pm)

NAME

       Class::MakeMethods::Emulator::Singleton - Emulate Class::Singleton

SYNOPSIS

	 use Class::MakeMethods::Emulator::Singleton;

	 # returns a new instance
	 my $one = Class::MakeMethods::Emulator::Singleton->instance();

	 # returns same instance
	 my $two = Class::MakeMethods::Emulator::Singleton->instance();

COMPATIBILITY

       This module emulates the functionality of Class::Singleton, using Class::MakeMethods to generate similar methods.

       You may use it directly, as shown in the SYNOPSIS above,

       Furthermore, you may call  "use Class::MakeMethods::Emulator::Singleton '-take_namespace';" to alias the Class::Singleton namespace to this
       package, and subsequent calls to the original package will be transparently handled by this emulator. To remove the emulation aliasing,
       call "use Class::MakeMethods::Emulator::Singleton '-release_namespace'".

       Caution: This affects all subsequent uses of Class::Singleton in your program, including those in other modules, and might cause unexpected
       effects.

DESCRIPTION

       A Singleton describes an object class that can have only one instance in any system.  An example of a Singleton might be a print spooler or
       system registry.  This module implements a Singleton class from which other classes can be derived.  By itself, the Class::Singleton module
       does very little other than manage the instantiation of a single object.  In deriving a class from Class::Singleton, your module will
       inherit the Singleton instantiation method and can implement whatever specific functionality is required.

SEE ALSO

       See Class::MakeMethods for general information about this distribution.

       See Class::MakeMethods::Emulator for more about this family of subclasses.

       See Class::Singleton for documentation of the original module.

       For a description and discussion of the Singleton class, see "Design Patterns", Gamma et al, Addison-Wesley, 1995, ISBN 0-201-63361-2.

       See "new" in Class::MakeMethods::Hash and "instance" in Class::MakeMethods::ClassVar for documentation of the created methods.

perl v5.10.1							    2004-09-06				     MakeMethods::Emulator::Singleton(3pm)

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