KiokuDB::TypeMap::Composite(3) A role for KiokuDB::TypeMaps created out of many smaller typemaps


version 0.57


package MyTypeMap;
use Moose;
extends qw(KiokuDB::TypeMap);
with qw(KiokuDB::TypeMap::Composite);
# declare typemaps to inherit from using the KiokuDB::TypeMap trait
# the 'includes' attribute will be built by collecting these attrs:
has foo_typemap => (
traits => [qw(KiokuDB::TypeMap)], # register for inclusion
does => "KiokUDB::Role::TypeMap",
is => "ro",
lazy_build => 1,
# this role also provides convenience methods for creating typemap objects
# easily:
sub _build_foo_typemap {
my $self = shift;
isa_entries => {
$class => {
type => 'KiokuDB::TypeMap::Entry::Callback',
intrinsic => 1,
collapse => "collapse",
expand => "new",
sub _build_bar_typemap {
my $self = shift;
# create a typemap with one naive isa entry
$self->_naive_isa_typemap("Class::Foo", @entry_args);
# you also get some construction time customization:
exclude => [qw(Class::Blort foo)],
override => {
"Class::Blah", => $alternate_entry,


This role provides a declarative, customizable way to set values for KiokuDB::TypeMap's "includes" attribute.

Any class consuming this role can declare attributes with the trait "KiokuDB::TypeMap".

The result is a typemap instance that inherits from the specified typemap in a way that is composable for the author and flexible for the user.

KiokuDB::TypeMap::Default is created using this role.


An array reference containing typemap attribute names (e.g. "path_class" in the default typemap) or class name to exclude.

Class exclusions are handled by "_create_typemap" and do not apply to already constructed typemaps.

A hash reference of classes to KiokuDB::TypeMap::Entry objects.

Class overrides are handled by "_create_typemap" and do not apply to already constructed typemaps.

Classes which don't have a definition will not be merged into the resulting typemap, simply create a typemap of your own and inherit if that's what you want.


_create_typemap %args
Creates a new typemap.

The entry arguments are converted before passing to ``new'' in KiokuDB::TypeMap:

        entries => {
            Foo => {
                type => "KiokuDB::TypeMap::Entry::Naive",
                intrinsic => 1,

The nested hashref will be used as arguments to ``new'' in KiokuDB::TypeMap::Entry::Naive in this example.

"exclude" and "override" are taken into account by the hashref conversion code.

_naive_isa_typemap $class, %entry_args
A convenience method to create a one entry typemap with a single inherited entry for $class of the type KiokuDB::TypeMap::Entry::Naive.

This is useful for when you have a base class that you'd like KiokuDB to persist automatically:

    sub _build_my_class_typemap {
        shift->_naive_isa_typemap( "My::Class::Base" );


Yuval Kogman <[email protected]>


This software is copyright (c) 2014 by Yuval Kogman, Infinity Interactive.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.