KiokuDB::Thunk - Internal only placeholder for deferred objects

KiokuDB documentation Contained in the KiokuDB distribution.

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NAME

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KiokuDB::Thunk - Internal only placeholder for deferred objects

SYNOPSIS

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    # do not use directly,
    # KiokuDB::Meta::Attribute::Lazy, KiokuDB::Meta::Instance and
    # KiokuDB::TypeMap::Entry::MOP will do the actual thunking of data so that
    # the thunk will never be visible unless you break encapsulation.

DESCRIPTION

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This is an internal placeholder object. It will be used on attributes that you mark with KiokuDB::Meta::Attribute::Lazy automatically, and should never be visible to the user because KiokuDB::Meta::Instance will automatically inflate it before it's even seen by the accessor's code.

KiokuDB documentation Contained in the KiokuDB distribution. 
#!/usr/bin/perl

package KiokuDB::Thunk;
use Moose;

use namespace::clean -except => 'meta';

has collapsed => (
    isa => "Ref",
    is  => "ro",
    required => 1,
);

has linker => (
    isa => "KiokuDB::Linker",
    is  => "ro",
);

has attr => (
    isa => "Class::MOP::Attribute",
    is  => "ro",
);

has value => (
    isa => "Ref",
    is  => "ro",
    lazy_build => 1,
);

sub _build_value {
    my $self = shift;

    return $self->linker->expand_object($self->collapsed);
}

sub vivify {
    my ( $self, $instance ) = @_;

    my $value = $self->value;

    my $attr = $self->attr;

    $attr->set_raw_value($instance, $value);

    $attr->_weaken_value($instance)
        if ref $value and $attr->is_weak_ref;

    return $value;
}

__PACKAGE__->meta->make_immutable;

__PACKAGE__

__END__