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[gitmo/moose-htdocs.git] / ppw_roles_talk / roles.xul

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<html:textarea id="builtinCode" style="visibility: collapse"><![CDATA[
Horizontal
Code Reuse
with
Møøse::Role
----
Stevan Little
stevan.little@iinteractive.com
http://www.iinteractive.com/moose
http://search.cpan.org/~stevan/
----
Roles
----
≠
----
Classes
----
Roles
do /not/
inherit.
----
Inheritance is
↕
vertical reuse.
----
Roles
compose.
----
Composition is
↔
horizontal reuse.
----
...
----
When
to use
Roles
----
My general rule 
of thumb is ...
----
s/MI/Roles/g
----
When 
to /not/ use 
Roles
----
When a class 
just makes 
more sense.
----
Roles are /not/ a
replacement for
inheritance.
----
How Roles 
Work
----
Roles are
orphans.
----
Roles are 
composed.
----
Local class
overrides role.
----
Role overrides 
inherited class.
----
Roles can 
conflict.
----
Method conflicts
must be 
disambiguated.
----
Attribute conflicts
cannot be 
disambiguated.
----
How
to use
Roles
----
  package My::Role;
  use Moose::Role;
  
  has my_attr => (is => 'rw');
  
  requires 'a_method';
  
  sub my_method { ... }
----
  package My::Class;
  use Moose;
  
  with 'My::Role';
  
  sub a_method { ... }
----
  my $o = My::Class->new(
      my_attr => '...'
  );
  
  $o->my_method();
----
Role 
Examples
----
Behavior
Reuse
----
  package My::App::Conversions;
  use Moose::Role;
  
  sub decimal_to_percentage { ... }
  sub percentage_to_decimal { ... }
----
Attribute
Reuse
----
  package My::App::WithDBICSchema;
  use Moose::Role;
  
  has 'schema' => (
      is      => 'ro',
      isa     => 'DBIx::Class::Schema',
      lazy    => 1,
      default => sub {
          My::App::DB->connect(...)
      }
  );
----
Abstract
Interfaces
----
  package My::App::Iterator::Abstract;
  use Moose::Role;
  
  requires 'has_next';
  requires 'next';
  requires 'peek';
----
Partial
“Classes”
----
  package My::App::Report::Base;
  use Moose::Role;
  
  requires 'calculate';
  
  sub run {
      my $self = shift;
      $self->setup;
      $self->calculate;
      $self->teardown;
  }
  
  sub setup { ... }
  sub teardown { ... }
----
Modules 
which use 
Roles
----
MooseX::Getopt
----
  package My::App;
  use Moose;
  
  with 'MooseX::Getopt';
  
  has 'foo' => (is => 'rw', isa => 'Int');
  
  sub run { ... }
  
  package main;
  My::App->new_with_options->run
----
  stevan>./my_app.pl --foo 10
----
MooseX::Storage
----
MooseX::AttributeHelpers
----
Thank You
for coming.
----
And always
remember ...
----
Roles
≠
Classes
]]></html:textarea>











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<!-- ***** BEGIN LICENSE BLOCK *****
   - Version: MPL 1.1
   -
   - The contents of this file are subject to the Mozilla Public License Version
   - 1.1 (the "License"); you may not use this file except in compliance with
   - the License. You may obtain a copy of the License at
   - http://www.mozilla.org/MPL/
   -
   - Software distributed under the License is distributed on an "AS IS" basis,
   - WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
   - for the specific language governing rights and limitations under the
   - License.
   -
   - The Original Code is the Takahashi-Method-based Presentation Tool in XUL.
   -
   - The Initial Developer of the Original Code is SHIMODA Hiroshi.
   - Portions created by the Initial Developer are Copyright (C) 2005
   - the Initial Developer. All Rights Reserved.
   -
   - Contributor(s): SHIMODA Hiroshi <piro@p.club.ne.jp>
   -
   - ***** END LICENSE BLOCK ***** -->