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Bread-Board-Declare-0.09
River stage one • 3 direct dependents • 5 total dependents
8 ++
/ Bread::Board::Declare

NAME

Bread::Board::Declare - create Bread::Board containers as normal Moose objects

VERSION

version 0.09

SYNOPSIS

  package MyApp;
  use Moose;
  use Bread::Board::Declare;

  has dsn => (
      is    => 'ro',
      isa   => 'Str',
      value => 'dbi:mysql:my_db',
  );

  has dbic => (
      is           => 'ro',
      isa          => 'MyApp::Model::DBIC',
      dependencies => ['dsn'],
      lifecycle    => 'Singleton',
  );

  has tt => (
      is  => 'ro',
      isa => 'MyApp::View::TT',
  );

  has controller => (
      is           => 'ro',
      isa          => 'MyApp::Controller',
      dependencies => {
          model => 'dbic',
          view  => 'tt',
      },
  );

  MyApp->new->controller; # new controller object with new model and view
  MyApp->new(
      model => MyApp::Model::KiokuDB->new,
  )->controller; # new controller object with new view and kioku model

DESCRIPTION

This module is a Moose extension which allows for declaring Bread::Board container classes in a more straightforward and natural way. It sets up Bread::Board::Container as the superclass, and creates services associated with each attribute that you create, according to these rules:

  • If the service => 0 option is passed to has, no service is created.

  • If the value option is passed to has, a Bread::Board::Literal service is created, with the given value.

  • If the block option is passed to has, a Bread::Board::BlockInjection service is created, with the given coderef as the block. In addition to receiving the service object (as happens in Bread::Board), this coderef will also be passed the container object.

  • If the attribute has a type constraint corresponding to a class, a Bread::Board::ConstructorInjection service is created, with the class corresponding to the type constraint.

  • Otherwise, a BlockInjection service is created which throws an exception. This allows services to be created for the sole purpose of being set through the attribute, without requiring a default to be specified. Note that required => 1 is still valid on these attributes.

Constructor parameters for services (dependencies, lifecycle, etc) can also be passed into the attribute definition; these will be forwarded to the service constructor. See Bread::Board::Declare::Meta::Role::Attribute for a full list of additional parameters to has.

If infer => 1 is passed in the attribute definition, the class in the type constraint will be introspected to find its required dependencies, and those dependencies will be automatically fulfilled as much as possible by corresponding services in the container. See Bread::Board::Manual::Concepts::Typemap for more information.

In addition to creating the services, this module also modifies the attribute reader generation, so that if the attribute has no value, a value will be resolved from the associated service. It also modifies the get method on services so that if the associated attribute has a value, that value will be returned immediately. This allows for overriding service values by passing replacement values into the constructor, or by calling setter methods.

Note that default/builder doesn't make a lot of sense in this setting, so they are explicitly disabled. In addition, multiple inheritance would just cause a lot of problems, so it is also disabled (although single inheritance and role application works properly).

NOTE: When using this module in roles with Moose versions prior to 2.0, the attribute trait will need to be applied explicitly to attributes that should become services, as in:

  has attr => (
      traits => ['Service'],
      is     => 'ro',
      isa    => 'Str',
      value  => 'value',
  )

BUGS

No known bugs.

Please report any bugs through RT: email bug-bread-board-declare at rt.cpan.org, or browse to http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Bread-Board-Declare.

SEE ALSO

Please see those modules/websites for more information related to this module.

SUPPORT

You can find this documentation for this module with the perldoc command.

    perldoc Bread::Board::Declare

You can also look for information at:

AUTHOR

Jesse Luehrs <doy at tozt dot net>

COPYRIGHT AND LICENSE

This software is copyright (c) 2011 by Jesse Luehrs.

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