MooseX::Storage::Traits::OnlyWhenBuilt - A custom trait to bypass serialization
version 0.53
{ package Point;
use Moose;
use MooseX::Storage;
with Storage( traits => [qw|OnlyWhenBuilt|] );
has 'x' => (is => 'rw', lazy_build => 1 );
has 'y' => (is => 'rw', predicate => '_has_y' );
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;
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 (i.e., where the predicate returns ’true’) will be serialized. This avoids any potentially expensive computations.
See the SYNOPSIS for a nice example that can be easily cargo-culted.
Bugs may be submitted through the RT bug tracker <https://rt.cpan.org/Public/Dist/Display.html?Name=MooseX-Storage> (or bug-MooseX-Storage AT rt DOT cpan DOT org <mailto:bug-MooseX-Storage AT rt DOT cpan DOT org>).
There is also a mailing list available for users of this distribution, at <http://lists.perl.org/list/moose.html>.
There is also an irc channel available for users of this distribution, at "#moose" on "irc.perl.org" <irc://irc.perl.org/#moose>.
• |
Chris Prather <chris DOT prather AT iinteractive DOT com> |
||
• |
Stevan Little <stevan DOT little AT iinteractive DOT com> |
||
• |
יובל קוג’מן (Yuval Kogman) <nothingmuch AT woobling DOT org> |
This software is copyright (c) 2007 by Infinity Interactive, Inc.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.