MooseX::CacheBacked - back class attributes in a cache
package Shirt;
use Moose;
use MooseX::CacheBacked;
has id => ( is => 1, isa => 'Str', required => 1 ); # must exist
has color => ( is => 'rw', isa => 'Str' );
has size => ( is => 'ro', isa => 'Int' );
# later...
my $c = Shirt->new(id => '123', color => 'blue', size => 5);
# inside cache:
# 123:id => 123
# 123:color => blue
# 123:size => 5
$c->color('yellow');
# inside cache:
# 123:color => 'yellow'Usually Moose uses a blessed hash for the low level storage of attribute values. MooseX::CacheBacked causes a cache to be used instead. Each object's attribute/value combinations become key/value pairs in the cache. The cache key is a combination of the objects id and the attribute name. For this reason, MooseX::CacheBacked classes require an attribute called id that is unique in the context that the object is used.
Whenever a MooseX::Cache attribute is set (via init_arg or via the writer method) the corresponding value in the cache is immediately adjusted.
Newly instantiated MooseX::Cache objects automatically have their attributes set to the values of any previously instantiated objects with the same id.
my $x = Some::MooseX::Cache::Class->new(id => 7);
$x->size(14);
$x->color('green');
$x->material('silk');
# This could be in another processes that has access to the cache
my $y = Some::MooseX::Cache::Class->new(id => 7);
$y->size; # 14
$y->color; # 'green'
$y->material('wool');
$x->material; # wool