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.\"
.IX Title "KiokuDB::Meta::Attribute::Lazy 3pm"
.TH KiokuDB::Meta::Attribute::Lazy 3pm "2022-05-23" "perl v5.34.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
KiokuDB::Meta::Attribute::Lazy \- Trait for lazy loaded attributes
.SH "VERSION"
.IX Header "VERSION"
version 0.57
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    # in your class:
\&
\&    package Foo;
\&    use KiokuDB::Class;
\&
\&    has bar => (
\&        traits => [qw(KiokuDB::Lazy)],
\&        isa => "Bar",
\&        is  => "ro",
\&    );
\&
\&
\&
\&    # Later:
\&
\&    my $foo = $dir\->lookup($id);
\&
\&    # bar is not yet loaded, it will be lazily fetched during this call:
\&    $foo\->bar;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This Moose::Meta::Attribute trait provides lazy loading on a per field basis
for objects stored in KiokuDB.
.PP
Instead of using proxy objects with \s-1AUTOLOAD,\s0 overloading, or similar hacks,
you can declaratively specify which attributes you want to make lazy, and this
will be done cleanly through the \s-1MOP.\s0
.PP
This is implemented by using a placeholder object, KiokuDB::Thunk which
contains references to the \s-1ID\s0 and the linker, and KiokuDB::Meta::Instance
will know to replace the placeholder with the actual loaded object when it is
fetched from the object by an accessor.
.SH "AUTHOR"
.IX Header "AUTHOR"
Yuval Kogman <nothingmuch@woobling.org>
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
This software is copyright (c) 2014 by Yuval Kogman, Infinity Interactive.
.PP
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.