X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=moose-class%2Fslides%2Findex.html;h=46ac36ab9225822fa1e8e023c01e5960fceb5602;hb=66b11069294324c31214650bd2e466fb75acd1f5;hp=a6cd0be6d624c44871ecc0b2e5e600f4761e1784;hpb=56f41d93181d88d8a00def5c08269130e2e37fc6;p=gitmo%2Fmoose-presentations.git diff --git a/moose-class/slides/index.html b/moose-class/slides/index.html index a6cd0be..46ac36a 100644 --- a/moose-class/slides/index.html +++ b/moose-class/slides/index.html @@ -52,7 +52,7 @@ img#me05 {top: 43px;left: 36px;}

Introduction to Moose

-

Dave Rolsky +

Dave Rolsky

@@ -71,8 +71,8 @@ img#me05 {top: 43px;left: 36px;}
@@ -155,7 +155,7 @@ img#me05 {top: 43px;left: 36px;} 
package Person;
 use Moose;
 
-has first_name => ( is => 'rw' );
+has first_name => ( is => 'ro' ); @@ -897,7 +897,6 @@ use Moose;
  • Accepts a hash or hashref; errors otherwise
  • Provide your own for other cases
  • Always call $class->SUPER::BUILDARGS(@_) as a fallback!
    • -
  • Make sure to pass the original value of @_ to the parent
    • @@ -951,10 +950,10 @@ sub BUILD {

    Object Construction a la Moose

    - 
    Person->new(@_)
    + 
    Person->new(@args)
      -
    1. Calls Person->BUILDARGS(@_) to turn @_ into a hashref
      2. +
    2. Calls Person->BUILDARGS(@args) to turn @args into a hashref
    3. Blesses a reference
    4. Populates attributes based on the hashref from #1
    5. Calls $new_object->BUILDALL($constructor_args) @@ -1033,7 +1032,7 @@ extends 'LWP';
    6. No DEMOLISH()
      7. -
    7. But see MooseX::NonMoose for a workaround
      8. +
    8. But MooseX::NonMoose fixes all of this
    @@ -1055,13 +1054,13 @@ use Moose; extends 'Person'; -override work => sub { +override work => sub { my $self = shift; die "Pay me first" unless $self->got_paid; - super(); -}; + super(); +};
    @@ -1070,7 +1069,7 @@ use Moose;
    @@ -1156,8 +1155,8 @@ Person->can('extends');

    Cleaning Up Moose Droppings

    package Person;
-use namespace::autoclean;
 use Moose;
+use namespace::autoclean;
 
 ...
 
@@ -1235,7 +1234,7 @@ use Moose;
 
 # perl bin/prove -lv t/00-prereq.t
 
-# perl install-moose (if needed)
+## Read the instructions in t/01-classes.t
 
 # perl bin/prove -lv t/01-classes.t
 
@@ -1308,30 +1307,32 @@ sub print {
   
    package Person;
 use Moose;
 
-with 'HasPermissions';
    
+with 'Printable';

    Classes Consume Roles

    -
    my $person = Person->new(
+
    package Person;
+
+sub as_string { $_[0]->first_name() }
+
+...
+
+my $person = Person->new(
     first_name   => 'Kenichi',
     last_name    => 'Asai',
     access_level => 42,
 );
 
-print $person->full_name
-    . ' has '
-    . $person->can_access(42)
-        ? 'great power'
-        : 'little power';
    
+$person->print();

    Roles in Practice

    @@ -1341,7 +1342,9 @@ print $person->full_name 
    package Person;
 use Moose;
 
-with 'Printable';
    +with 'Printable'; + +sub as_string { $_[0]->first_name() }
    @@ -1352,6 +1355,8 @@ use Moose; with 'Printable'; +sub as_string { $_[0]->first_name() } + has has_been_printed => ( is => 'rw' ); sub print { @@ -1480,34 +1485,6 @@ Integer->does('Comparable'); # also true!
    -

    Name Conflicts Between Roles

    - - 
    package HasSubProcess;
-use Moose::Role;
-
-sub execute { ... }
-
-package Killer;
-use Moose::Role;
-
-with 'HasSubProcess';
-
-sub execute { ... }
    -
    - -
    -

    Delayed Conflict

    - - 
    package SysadminAssassin;
-with 'Killer';
    - - -
    - -

    Roles as Interfaces

    @@ -1657,8 +1634,6 @@ requires 'compare';

    Real Examples

    - - -
    -

    Method Modifiers Summary

    - -
    @@ -2686,11 +2600,15 @@ has start_date => (

    Subtype Shortcuts - class_type

    use Moose::Util::TypeConstraints;
-class_type 'DateTime';
    + +class_type 'DateTime'; + +
    -
    subtype     'DateTime',
+
    
+subtype     'DateTime',
     as      'Object',
     where   { $_->isa('DateTime') },
     message { ... };
    
@@ -2700,11 +2618,15 @@ class_type 'DateTime';

    Subtype Shortcuts - role_type

    use Moose::Util::TypeConstraints;
-role_type 'Printable';
    + +role_type 'Printable'; + +
    -
    subtype 'Printable',
+
    
+subtype 'Printable',
     as  'Object',
     where
         { Moose::Util::does_role(
@@ -2716,11 +2638,15 @@ role_type 'Printable';
    
   
    Subtype Shortcuts - duck_type
    
 
   
    use Moose::Util::TypeConstraints;
-duck_type Car => qw( run break_down );
    
+
+duck_type Car => qw( run break_down );
+
+
    -
    subtype 'Car',
+
    
+subtype 'Car',
     as      'Object',
     where   { all { $_->can($_) }
               qw( run break_down ) },
@@ -2731,11 +2657,15 @@ duck_type Car => qw( run break_down );
    
   
    Subtype Shortcuts - enum
    
 
   
    use Moose::Util::TypeConstraints;
-enum Color => qw( red blue green );
    
+
+enum Color => qw( red blue green );
+
+
    -
    my %ok = map { $_ => 1 }
+
    
+my %ok = map { $_ => 1 }
              qw( red blue green );
 
 subtype     'Color'
@@ -2750,7 +2680,9 @@ subtype     'Color'
   
    package Person;
 
 my $posint =
-    subtype as 'Int', where { $_ > 0 };
+    subtype
+        as 'Int',
+        where { $_ > 0 };
 
 has size => (
     is  => 'ro',
@@ -2809,7 +2741,8 @@ coerce 'My::DateTime',
 
    
   
    Coercion Examples
    
 
-  
    coerce 'ArrayRef[Int]',
+  
    # BAD CODE - DO NOT COPY
+coerce 'ArrayRef[Int]',
     from 'Int',
     via  { [ $_ ] };
    
 
@@ -2907,7 +2840,7 @@ sub work {
   
    Digression: The Type Registry
    
 
   
      
-    
    • Types are actually Moose::Meta::TypeConstraints objects
      • 
+    
    • Types are actually Moose::Meta::TypeConstraint objects
      • 
     
    • Stored in an interpreter-global registry mapping names to objects
      • 
   
    
 
    
@@ -3029,10 +2962,21 @@ has transaction_history => (
 
 
 
    
+  
    Specio
    
+
+  
      
+    
    • My attempt to replace MooseX::Types and built-in types
      • 
+    
    • Third-system effect?
      • 
+    
    • Still alpha - needs some work
      • 
+  
    
+
    
+
+
    
   
    Recommendation
    
 
   
      
-    
    • Use MooseX::Types
      • 
+    
    • Use MooseX::Types for now
      • 
+    
    • Switch to Specio when it's ready?
      • 
     
    • Compile time error catching and automatic namespacing are huge wins
      • 
     
    • Docs from Moose::Util::TypeConstraints are 98% compatible with MooseX::Types anyway
      • 
     
    • A function exported by a type library works wherever a type name would
      • 
@@ -3257,8 +3201,12 @@ has account => (
     },
    
 
   
      
-    
    • $person->receive_money = $person->account->deposit
      • 
-    
    • $person->give_money = $person->account->withdraw
      • 
+    
    • $person->receive_money
+      
      
+          = $person->account->deposit
      • 
+    
    • $person->give_money
+      
      
+          = $person->account->withdraw
      • 
   
    
 
 
@@ -3346,8 +3294,7 @@ has history => (
   
    package Person;
 use Moose;
 has _favorite_numbers => (
-    traits   => [ 'Array' ],
-    is       => 'bare',
+    traits   => [ 'Array' ],
     isa      => 'ArrayRef[Int]',
     default  => sub { [] },
     init_arg => undef,
@@ -3410,7 +3357,7 @@ has account => (
     isa     => 'BankAccount',
     handles => {
         receive_100 =>
-            [ 'deposit', 100 ]
+            [ 'deposit', 100 ],
         give_100    =>
             [ 'withdraw', 100 ]
     },
@@ -3426,82 +3373,6 @@ $person->account->deposit(100);
    
 
 
 
    
-  
    Traits and Metaclasses
    
-
-  
      
-    
    • The ultimate in customization
      • 
-    
    • Per attribute metaclasses
      • 
-    
    • Per attribute roles applied to the attribute metaclass
      • 
-    
    • Change the meta-level behavior
      • 
-  
    
-
    
-
-
    
-  
    Traits and Metaclasses
    
-
-  
      
-    
    • The default metaclass is Moose::Meta::Attribute
      • 
-    
    • Controls accessor generation, defaults, delegation, etc.
      • 
-    
    • Adding a role to this metaclass (or replacing it) allows for infinite customization
      • 
-  
    
-
    
-
-
    
-  
    Traits and Metaclasses
    
-
-  
      
-    
    • Can add/alter/remove an attribute parameter (from has)
      • 
-    
    • Can change behavior of created attribute
      • 
-  
    
-
    
-
-
    
-  
    Simple Trait Example
    
-
-  
    package Person;
-use Moose;
-use MooseX::LabeledAttributes;
-
-has ssn => (
-    traits => [ 'Labeled' ],
-    is     => 'ro',
-    isa    => 'Str',
-    label  => 'Social Security Number',
-);
-print Person->meta
-            ->get_attribute('ssn')->label;
    
-
    
-
-
    
-  
    Simple Metaclass Example
    
-
-  
    package Person;
-use Moose;
-use MooseX::LabeledAttributes;
-
-has ssn => (
-    metaclass =>
-        'MooseX::Meta::Attribute::Labeled',
-    is        => 'ro',
-    isa       => 'Str',
-    label     => 'Social Security Number',
-);
-print Person->meta
-            ->get_attribute('ssn')->label;
    
-
    
-
-
    
-  
    Traits vs Metaclass
    
-
-  
      
-    
    • Can apply any mix of traits to an attribute
      • 
-    
    • But just one metaclass
      • 
-    
    • Traits (aka roles) can cooperate
      • 
-    
    • Metaclasses require you to pick just one
      • 
-  
    
-
    
-
-
    
   
    Advanced Attributes Summary
    
 
   
      
@@ -3509,11 +3380,14 @@ print Person->meta
     
    • Use trigger to do an action post-attribute write
      • 
     
    • Use delegations to hide "internal" objects
      • 
     
    • Use native delegations to treat Perl types as objects
      • 
-    
    • Traits and metaclasses let you extend Moose's core attribute features
      • 
   
    
 
    
 
 
    
+  
    Questions?
    
+
      
+
+
    
   
    Exercises
    
 
   
    # cd exercises
@@ -3531,7 +3405,7 @@ Iterate til this passes all its tests
    
   
    
 
   
    
-    Otherwise, jump to slide 268 ...
+    Otherwise, jump to slide 269 ...
   
    
 
    
 
@@ -3544,7 +3418,7 @@ Iterate til this passes all its tests
    
 
   
      
     
    • Not comprehensive
      • 
-    
    • 177 MooseX distributions on CPAN as of 09/21/2010
      • 
+    
    • 188 MooseX distributions on CPAN as of 02/03/2011
      • 
     
    • Some of them are crap
      • 
   
    
 
@@ -3565,7 +3439,7 @@ Iterate til this passes all its tests

    MooseX::Declare

    use MooseX::Declare;
-use 5.10.0; # for say
+use 5.12.0; # for say
 
 class Person {
     has greeting =>
@@ -3584,7 +3458,7 @@ class Person {
     
  • Still experimental-ish, but seeing more and more use
    • 
     
  • Not a source filter!
    • 
     
  • Hooks into the Perl parser rather than filtering all your code
    • 
-    
  • But not supported by PPI, perltidy, etc.
    •  (yet?)
+    
  • But not supported by PPI, perltidy, etc. (yet?)
    • 
   
 
 
@@ -3738,12 +3612,13 @@ with HasCollection => { type => 'Int' };

    @@ -3752,12 +3627,12 @@ with HasCollection => { type => 'Int' };     @@ -3771,7 +3646,7 @@ with HasCollection => { type => 'Int' };