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#!/usr/bin/perl
package KiokuDB::Role::ID::Content;
use Moose::Role;
use namespace::clean -except => 'meta';
with qw(
KiokuDB::Role::ID
KiokuDB::Role::Immutable
);
__PACKAGE__
__END__
=pod
=head1 NAME
KiokuDB::Role::ID::Content - Content dependent object IDs
=head1 SYNOPSIS
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,
);
=head1 DESCRIPTION
This is a role for L<KiokuDB::Role::Immutable> objects whose IDs depend on
their content, or in other words content addressable objects.
A canonical example is a string identified by its SHA-1 hash, as is
demonstrated in the L</SYNOPSIS>.
Objects which do this role are never updated in the database just like
L<KiokuDB::Role::Immutable> objects.
Additionally, it is not an error to insert such objects twice since the objects
are assumed to be identical.
=cut