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.\" ========================================================================
.\"
.IX Title "KiokuDB::Linker 3pm"
.TH KiokuDB::Linker 3pm "2014-03-25" "perl v5.18.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
KiokuDB::Linker \- Relinks live objects from storage entries
.SH "VERSION"
.IX Header "VERSION"
version 0.57
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    # mostly internal
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The linker reconnects entry data, recreating the connected object graph in
memory.
.PP
The linkage process starts with an \s-1ID \s0(or several IDs) to be loaded passed to
the \f(CW\*(C`get_or_load_objects\*(C'\fR method.
.PP
This \s-1ID\s0 will first be searched for in the live object set
(KiokuDB::LiveObjects). If the object is already live, then it will be
returned as is.
.PP
If the object is not live, then the corresponding entry is fetched from the
backend, and expanded into an actual instance.
.PP
Expansion consults the KiokuDB::TypeMap using KiokuDB::TypeMap::Resolver,
to find the correct typemap entry (see
\&\*(L"\s-1COLLAPSING STRATEGIES\*(R"\s0 in KiokuDB::Collapser and KiokuDB::TypeMap), and
that is used for the actual expansion.
.PP
Most of the grunt work is delegated by the entries back to the linker using the
\&\f(CW\*(C`inflate_data\*(C'\fR method, which handles circular structures, retrying of tied
structures, etc.
.PP
Inflated objects are registered with KiokuDB::LiveObjects, and get inserted
into the current live object scope (KiokuDB::LiveObjects::Scope). The
scope's job is to maintain a reference count of at least 1 for any loaded
object, until it is destroyed itself. This ensures that weak references are not
destroyed prematurely, but allows their use in order to avoid memory leaks.
.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.