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.\" ========================================================================
.\"
.IX Title "KiokuDB::Role::ID::Content 3pm"
.TH KiokuDB::Role::ID::Content 3pm "2014-03-25" "perl v5.18.2" "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::Role::ID::Content \- Content dependent object IDs
.SH "VERSION"
.IX Header "VERSION"
version 0.57
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&    package BLOB;
\&    use Moose;
\&
\&    use Digest::SHA1;
\&
\&    with qw(KiokuDB::Role::ID::Content);
\&
\&    sub kiokudb_object_id {
\&        my $self = shift;
\&        sha1_hex($self\->data);
\&    }
\&
\&    has data => (
\&        isa => "Str",
\&        is  => "ro",
\&        required => 1,
\&    );
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This is a role for KiokuDB::Role::Immutable objects whose IDs depend on
their content, or in other words content addressable objects.
.PP
A canonical example is a string identified by its \s-1SHA\-1\s0 hash, as is
demonstrated in the \*(L"\s-1SYNOPSIS\*(R"\s0.
.PP
Objects which do this role are never updated in the database just like
KiokuDB::Role::Immutable objects.
.PP
Additionally, it is not an error to insert such objects twice since the objects
are assumed to be identical.
.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.