Blue Cross Blue Shield grows their data center without adding space


 
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Old 09-09-2008
Blue Cross Blue Shield grows their data center without adding space

When Blue Cross Blue Shield was faced with the challenge of expanding their datacenter, they realized they were literally out of room.* They could not add anything further to their power grid or physically in the room itself.* They turned to HP and the new c-Class Blade System.

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Class::Data::Inheritable(3)				User Contributed Perl Documentation			       Class::Data::Inheritable(3)

NAME
Class::Data::Inheritable - Inheritable, overridable class data SYNOPSIS
package Stuff; use base qw(Class::Data::Inheritable); # Set up DataFile as inheritable class data. Stuff->mk_classdata('DataFile'); # Declare the location of the data file for this class. Stuff->DataFile('/etc/stuff/data'); # Or, all in one shot: Stuff->mk_classdata(DataFile => '/etc/stuff/data'); DESCRIPTION
Class::Data::Inheritable is for creating accessor/mutators to class data. That is, if you want to store something about your class as a whole (instead of about a single object). This data is then inherited by your subclasses and can be overriden. For example: Pere::Ubu->mk_classdata('Suitcase'); will generate the method Suitcase() in the class Pere::Ubu. This new method can be used to get and set a piece of class data. Pere::Ubu->Suitcase('Red'); $suitcase = Pere::Ubu->Suitcase; The interesting part happens when a class inherits from Pere::Ubu: package Raygun; use base qw(Pere::Ubu); # Raygun's suitcase is Red. $suitcase = Raygun->Suitcase; Raygun inherits its Suitcase class data from Pere::Ubu. Inheritance of class data works analogous to method inheritance. As long as Raygun does not "override" its inherited class data (by using Suitcase() to set a new value) it will continue to use whatever is set in Pere::Ubu and inherit further changes: # Both Raygun's and Pere::Ubu's suitcases are now Blue Pere::Ubu->Suitcase('Blue'); However, should Raygun decide to set its own Suitcase() it has now "overridden" Pere::Ubu and is on its own, just like if it had overriden a method: # Raygun has an orange suitcase, Pere::Ubu's is still Blue. Raygun->Suitcase('Orange'); Now that Raygun has overridden Pere::Ubu futher changes by Pere::Ubu no longer effect Raygun. # Raygun still has an orange suitcase, but Pere::Ubu is using Samsonite. Pere::Ubu->Suitcase('Samsonite'); Methods mk_classdata Class->mk_classdata($data_accessor_name); Class->mk_classdata($data_accessor_name => $value); This is a class method used to declare new class data accessors. A new accessor will be created in the Class using the name from $data_accessor_name, and optionally initially setting it to the given value. To facilitate overriding, mk_classdata creates an alias to the accessor, _field_accessor(). So Suitcase() would have an alias _Suitcase_accessor() that does the exact same thing as Suitcase(). This is useful if you want to alter the behavior of a single accessor yet still get the benefits of inheritable class data. For example. sub Suitcase { my($self) = shift; warn "Fashion tragedy" if @_ and $_[0] eq 'Plaid'; $self->_Suitcase_accessor(@_); } AUTHOR
Original code by Damian Conway. Maintained by Michael G Schwern until September 2005. Now maintained by Tony Bowden. BUGS and QUERIES Please direct all correspondence regarding this module to: bug-Class-Data-Inheritable@rt.cpan.org COPYRIGHT and LICENSE Copyright (c) 2000-2005, Damian Conway and Michael G Schwern. All Rights Reserved. This module is free software. It may be used, redistributed and/or modified under the same terms as Perl itself. SEE ALSO
perltooc has a very elaborate discussion of class data in Perl. perl v5.18.2 2008-01-25 Class::Data::Inheritable(3)