NAME
MooseX::Storage::Traits::OnlyWhenBuilt - A custom trait to bypass serialization
VERSION
version 0.53
SYNOPSIS
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
;
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 (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.
SUPPORT
Bugs may be submitted through the RT bug tracker (or bug-MooseX-Storage@rt.cpan.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
.
AUTHORS
Chris Prather <chris.prather@iinteractive.com>
Stevan Little <stevan.little@iinteractive.com>
יובל קוג'מן (Yuval Kogman) <nothingmuch@woobling.org>
COPYRIGHT AND LICENSE
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.