ppw_roles_talk/roles.xul

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   3 Horizontal
   4 Code Reuse
   5 with
   6 Møøse::Role
   7 ----
   8 Stevan Little
   9 stevan.little@iinteractive.com
  10 http://www.iinteractive.com/moose
  11 http://search.cpan.org/~stevan/
  12 ----
  13 Roles
  14 ----
  15 ≠
  16 ----
  17 Classes
  18 ----
  19 Roles
  20 do /not/
  21 inherit.
  22 ----
  23 Inheritance is
  24 ↕
  25 vertical reuse.
  26 ----
  27 Roles
  28 compose.
  29 ----
  30 Composition is
  31 ↔
  32 horizontal reuse.
  33 ----
  34 ...
  35 ----
  36 When
  37 to use
  38 Roles
  39 ----
  40 My general rule
  41 of thumb is ...
  42 ----
  43 s/MI/Roles/g
  44 ----
  45 When
  46 to /not/ use
  47 Roles
  48 ----
  49 When a class
  50 just makes
  51 more sense.
  52 ----
  53 Roles are /not/ a
  54 replacement for
  55 inheritance.
  56 ----
  57 How Roles
  58 Work
  59 ----
  60 Roles are
  61 orphans.
  62 ----
  63 Roles are
  64 composed.
  65 ----
  66 Local class
  67 overrides role.
  68 ----
  69 Role overrides
  70 inherited class.
  71 ----
  72 Roles can
  73 conflict.
  74 ----
  75 Method conflicts
  76 must be
  77 disambiguated.
  78 ----
  79 Attribute conflicts
  80 cannot be
  81 disambiguated.
  82 ----
  83 How
  84 to use
  85 Roles
  86 ----
  87   package My::Role;
  88   use Moose::Role;
  89
  90   has my_attr => (is => 'rw');
  91
  92   requires 'a_method';
  93
  94   sub my_method { ... }
  95 ----
  96   package My::Class;
  97   use Moose;
  98
  99   with 'My::Role';
 100
 101   sub a_method { ... }
 102 ----
 103   my $o = My::Class->new(
 104       my_attr => '...'
 105   );
 106
 107   $o->my_method();
 108 ----
 109 Role
 110 Examples
 111 ----
 112 Behavior
 113 Reuse
 114 ----
 115   package My::App::Conversions;
 116   use Moose::Role;
 117
 118   sub decimal_to_percentage { ... }
 119   sub percentage_to_decimal { ... }
 120 ----
 121 Attribute
 122 Reuse
 123 ----
 124   package My::App::WithDBICSchema;
 125   use Moose::Role;
 126
 127   has 'schema' => (
 128       is      => 'ro',
 129       isa     => 'DBIx::Class::Schema',
 130       lazy    => 1,
 131       default => sub {
 132           My::App::DB->connect(...)
 133       }
 134   );
 135 ----
 136 Abstract
 137 Interfaces
 138 ----
 139   package My::App::Iterator::Abstract;
 140   use Moose::Role;
 141
 142   requires 'has_next';
 143   requires 'next';
 144   requires 'peek';
 145 ----
 146 Partial
 147 “Classes”
 148 ----
 149   package My::App::Report::Base;
 150   use Moose::Role;
 151
 152   requires 'calculate';
 153
 154   sub run {
 155       my $self = shift;
 156       $self->setup;
 157       $self->calculate;
 158       $self->teardown;
 159   }
 160
 161   sub setup { ... }
 162   sub teardown { ... }
 163 ----
 164 Modules
 165 which use
 166 Roles
 167 ----
 168 MooseX::Getopt
 169 ----
 170   package My::App;
 171   use Moose;
 172
 173   with 'MooseX::Getopt';
 174
 175   has 'foo' => (is => 'rw', isa => 'Int');
 176
 177   sub run { ... }
 178
 179   package main;
 180   My::App->new_with_options->run
 181 ----
 182   stevan>./my_app.pl --foo 10
 183 ----
 184 MooseX::Storage
 185 ----
 186 MooseX::AttributeHelpers
 187 ----
 188 Thank You
 189 for coming.
 190 ----
 191 And always
 192 remember ...
 193 ----
 194 Roles
 195 ≠
 196 Classes
 197 ]]></html:textarea>
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 326 <!-- ***** BEGIN LICENSE BLOCK *****
 327    - Version: MPL 1.1
 328    -
 329    - The contents of this file are subject to the Mozilla Public License Version
 330    - 1.1 (the "License"); you may not use this file except in compliance with
 331    - the License. You may obtain a copy of the License at
 332    - http://www.mozilla.org/MPL/
 333    -
 334    - Software distributed under the License is distributed on an "AS IS" basis,
 335    - WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 336    - for the specific language governing rights and limitations under the
 337    - License.
 338    -
 339    - The Original Code is the Takahashi-Method-based Presentation Tool in XUL.
 340    -
 341    - The Initial Developer of the Original Code is SHIMODA Hiroshi.
 342    - Portions created by the Initial Developer are Copyright (C) 2005
 343    - the Initial Developer. All Rights Reserved.
 344    -
 345    - Contributor(s): SHIMODA Hiroshi <piro@p.club.ne.jp>
 346    -
 347    - ***** END LICENSE BLOCK ***** -->
 348
 349