=head1 NAME

Reaction::Manual::Internals

=head2 Hacking on Reaction

=head3 What is a component?

=head3 What component types are there?

=head3 How do I create a new component?

=head3 How does it work with a database?

=head3 What about Moose?

L<Moose>

=head3 Type system

=head3 What Perl modules should I be familiar with, in order to hack on Reaction's
internals?

=over

=item L<Moose>

A complete modern object system for Perl 5.

=item L<aliased>

Use shorter package names, i.e., "X::Y::Z" as "Z".

=item L<Catalyst>

The MVC application framework Reaction uses.

=over

=item * L<Catalyst::Controller::BindLex>

=item * L<Catalyst::Model::DBIC::Schema>

=item * L<Catalyst::Plugin::ConfigLoader> 

=item * L<Catalyst::Plugin::I18N>

=item * L<Catalyst::Plugin::Static::Simple>

=item * L<Catalyst::View::TT>

=back

=item TT

Template Toolkit

=item L<Config::General> 

Generic config file module.

=item L<DBIx::Class> 

Object/Relational mapper.

=item L<DateTime>

=item L<DateTime::Format::MySQL>

=item L<Digest::MD5>

=item L<Email::MIME>

=item L<Email::MIME::Creator>

=item L<Email::Send>

=item L<Email::Valid>

=item L<SQL::Translator>

=item L<Test::Class>

=item L<Test::Memory::Cycle>

=item L<Time::ParseDate>

=back

=head3 Packages involved

=over

=item L<Reaction::Class>

Utility class, sets up to export a few methods that return parameters for use
within Moose's C<has> (as new parameters) in other packages. It also C<use>s
Moose itself.

The methods it injects are:

=over

=item set_or_lazy_build($field_name)

The attribute is required, if not provided beforehand the build_${name} method
will be called on the object when the attribute's getter is first called. If
the method does not exist, or returns undef, an error will be thrown.

=item set_or_lazy_fail()

The attribute is required, if not provided beforehand the 'lazy' parameter of
Moose will make it fail.

=item trigger_adopt()

Calls adopt_${type} after the attribute value is set to $type.

=item register_inc_entry()

Will mark the calling package as already included, using %INC.

=back

=item Reaction::InterfaceModel::Action

=item Reaction::InterfaceModel::Action::DBIC::ResultSet::Create;

=item Reaction::InterfaceModel::Action::DBIC::ActionReflector;

A method "adaptor" that creates the needed objects to support CRUD DBIC
actions. In the future the code could be moved to a class higher in the
hierarchy and only contain the operations to adapt.

Sample run:

Reaction::InterfaceModel::Action::DBIC::ActionReflector->reflect_actions_for(
Reaction::InterfaceModel::Action::DBIC::ActionReflector=HASH(0x93cb2f0) 
RTest::TestDB::Foo 
ComponentUI::Model::Action
)

Generates and evaluates:

package ComponentUI::Model::Action::DeleteFoo;
use Reaction::Class;
extends 'Reaction::InterfaceModel::Action::DBIC::Result::Delete';
package ComponentUI::Model::Action::UpdateFoo;
use Reaction::Class;
extends 'Reaction::InterfaceModel::Action::DBIC::Result::Update';
has 'baz_list' => (isa => 'ArrayRef', is => 'rw', set_or_lazy_fail('baz_list'), default => sub { [] }, valid_values => sub {
$_[0]->target_model
->result_source
->related_source('links_to_baz_list')
->related_source('baz')
->resultset;
});
has 'last_name' => (isa => 'NonEmptySimpleStr', is => 'rw', set_or_lazy_fail('last_name'));
has 'first_name' => (isa => 'NonEmptySimpleStr', is => 'rw', set_or_lazy_fail('first_name'));
package ComponentUI::Model::Action::CreateFoo;
use Reaction::Class;
extends 'Reaction::InterfaceModel::Action::DBIC::ResultSet::Create';
has 'baz_list' => (isa => 'ArrayRef', is => 'rw', set_or_lazy_fail('baz_list'), default => sub { [] }, valid_values => sub {
$_[0]->target_model
->result_source
->related_source('links_to_baz_list')
->related_source('baz')
->resultset;
});
has 'last_name' => (isa => 'NonEmptySimpleStr', is => 'rw', set_or_lazy_fail('last_name'));
has 'first_name' => (isa => 'NonEmptySimpleStr', is => 'rw', set_or_lazy_fail('first_name'));

=item Reaction::InterfaceModel::Action::DBIC::Result::Delete

=item Reaction::InterfaceModel::Action::DBIC::Result::Update

=item Reaction::InterfaceModel::Action::DBIC::User::ResetPassword

=item Reaction::InterfaceModel::Action::DBIC::User::Role::SetPassword

=item Reaction::InterfaceModel::Action::DBIC::User::ChangePassword

=item Reaction::InterfaceModel::Action::User::ResetPassword

=item Reaction::InterfaceModel::Action::User::ChangePassword

=item Reaction::InterfaceModel::Action::User::SetPassword

=item Reaction::Meta::InterfaceModel::Action::ParameterAttribute

=item Reaction::Meta::InterfaceModel::Action::Class

=item Reaction::Types::Email

=item Reaction::Types::Core

=item Reaction::Types::DateTime

=item Reaction::Types::File

=item Reaction::Types::DBIC

=item Reaction::UI::ViewPort::ListView

=item Reaction::UI::ViewPort::Field::Text

=item Reaction::UI::ViewPort::Field::ChooseMany

=item Reaction::UI::ViewPort::Field::String

=item Reaction::UI::ViewPort::Field::Number

=item Reaction::UI::ViewPort::Field::HiddenArray

=item Reaction::UI::ViewPort::Field::DateTime

=item Reaction::UI::ViewPort::Field::File

=item Reaction::UI::ViewPort::Field::ChooseOne

=item Reaction::UI::ViewPort::Field::Password

=item Reaction::UI::ViewPort::ActionForm

=item Reaction::UI::ViewPort::Field

=item Reaction::UI::FocusStack

=item Reaction::UI::RootController

=item Reaction::UI::Window

=item Reaction::UI::Renderer::XHTML

=item Reaction::UI::ViewPort

=item Reaction::UI::CRUDController

=item Reaction::UI::Controller

=back

=head3 Remarks about POD

Don't use C<=over N>. POD assumes that the indent level is 4 if you leave
it out. Most POD renderers ignore your indent level anyway.

=head2 UNSORTED

Packages involved

t/lib/Rtest/TestDB*: TestDB DBIC declarations.
t/lib/RTest/TestDB.pm: does DBIC populate for t/.
t/lib/RTest/UI/ XXX

Reaction::Test::WithDB;
Reaction::Test;
Reaction::Test::Mock::Context;
Reaction::Test::Mock::Request;
Reaction::Test::Mock::Response;

=head1 AUTHORS

See L<Reaction::Class> for authors.

=head1 LICENSE

See L<Reaction::Class> for the license.

=cut