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MooseX::Storage::Engine::Trait::OnlyWhenBuilt(3)buted Perl Documentationage::Engine::Trait::OnlyWhenBuilt(3)



NAME
       MooseX::Storage::Engine::Trait::OnlyWhenBuilt - An engine trait to bypass serialization

SYNOPSIS
           {   package Point;
               use Moose;
               use MooseX::Storage;

               with Storage( traits => [qw|OnlyWhenBuilt|] );

               has 'x' => (is => 'rw', lazy_build => 1 );
               has 'y' => (is => 'rw', lazy_build => 1 );
               has 'z' => (is => 'rw', builder => '_build_z' );

               sub _build_x { 3 }
               sub _build_y { expensive_computation() }
               sub _build_z { 3 }
           }

           my $p = Point->new( 'x' => 4 );

           # the result of ->pack will contain:
           # { x => 4, z => 3 }
           $p->pack;

DESCRIPTION
       Sometimes you don't want a particular attribute to be part of the serialization if it has not been
       built yet. If you invoke "Storage()" as outlined in the "Synopsis", only attributes that have been
       built (ie, where the predicate returns 'true') will be serialized.  This avoids any potentially
       expensive computations.

       This trait is applied to an instance of MooseX::Storage::Engine, for the user-visible version shown
       in the SYNOPSIS, see MooseX::Storage::Traits::OnlyWhenBuilt

METHODS
   Introspection
       meta

BUGS
       All complex software has bugs lurking in it, and this module is no exception. If you find a bug
       please either email me, or add the bug to cpan-RT.

AUTHOR
       Stevan Little <stevan.little@iinteractive.com>

COPYRIGHT AND LICENSE
       Copyright 2007-2008 by Infinity Interactive, Inc.

       <http://www.iinteractive.com>

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



perl v5.12.5                                     2009-08-11 MooseX::Storage::Engine::Trait::OnlyWhenBuilt(3)