Apache Mahout: Real-Time Decisioning in the MapReduce Framework

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apache::singleton

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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