X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=moose-class%2Fslides%2Findex.html;h=e8302e4e73cbe636f765ed888232e74e28c1cd6d;hb=a88cc08084397dc7667e26dc315fb5492d8bf558;hp=c8c2e210d05de76de4944bdb8c3f6d2646e71758;hpb=92559e0f46b7f7bb4e3bae79f72b28ede8f9c4c3;p=gitmo%2Fmoose-presentations.git diff --git a/moose-class/slides/index.html b/moose-class/slides/index.html index c8c2e21..e8302e4 100644 --- a/moose-class/slides/index.html +++ b/moose-class/slides/index.html @@ -71,7 +71,7 @@ img#me05 {top: 43px;left: 36px;} @@ -950,10 +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) @@ -1032,7 +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
@@ -1155,8 +1155,8 @@ Person->can('extends');

Cleaning Up Moose Droppings

package Person;
-use namespace::autoclean;
 use Moose;
+use namespace::autoclean;
 
 ...
 
@@ -1234,8 +1234,6 @@ 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
@@ -1487,34 +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

+

Read-only vs Read-write

+ + +
+ +

Required-ness

@@ -2421,9 +2392,9 @@ around run => sub {
  • alter parameters passed to the original method
  • alter the return value of the original method
  • not call the original method at all (or call a different method)
    • -
  • When using modifiers in a role, require the modified method
    • +
  • When using modifiers in a role, require the modified method
    • @@ -2629,11 +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 { ... };
    
@@ -2643,11 +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(
@@ -2659,11 +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 ) },
@@ -2674,11 +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'
@@ -2693,7 +2680,9 @@ subtype     'Color'
   
    package Person;
 
 my $posint =
-    subtype as 'Int', where { $_ > 0 };
+    subtype
+        as 'Int',
+        where { $_ > 0 };
 
 has size => (
     is  => 'ro',
@@ -2752,7 +2741,8 @@ coerce 'My::DateTime',
 
    
   
    Coercion Examples
    
 
-  
    coerce 'ArrayRef[Int]',
+  
    # BAD CODE - DO NOT COPY
+coerce 'ArrayRef[Int]',
     from 'Int',
     via  { [ $_ ] };
    
 
@@ -2850,7 +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
      • 
   
    
 
    
@@ -2972,10 +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
      • 
@@ -3137,6 +3138,25 @@ has lungs => (
 
    
 
 
    
+  
    Delegation Explained
    
+
+
    package Person;
+
+has lungs => (
+    is      => 'ro',
+    isa     => 'Lungs',
+    handles => [ 'inhale', 'exhale' ],
+);
+
+sub inhale {
+    my $self = shift;
+    $self->lungs()->inhale();
+}
+
+sub exhale { ... }
    
+
    
+
+
    
   
    Why Delegation?
    
 
   
      
@@ -3200,8 +3220,12 @@ 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
      • 
   
    
 
 
@@ -3289,8 +3313,7 @@ has history => (
   
    package Person;
 use Moose;
 has _favorite_numbers => (
-    traits   => [ 'Array' ],
-    is       => 'bare',
+    traits   => [ 'Array' ],
     isa      => 'ArrayRef[Int]',
     default  => sub { [] },
     init_arg => undef,
@@ -3369,82 +3392,6 @@ $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
    
 
   
      
@@ -3452,11 +3399,14 @@ 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
@@ -3508,7 +3458,7 @@ 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 =>
@@ -3681,12 +3631,13 @@ with HasCollection => { type => 'Int' };
    
   
    
 
   
 
    
 
@@ -3695,12 +3646,12 @@ with HasCollection => { type => 'Int' };
    
 
   
 
 
@@ -3714,7 +3665,7 @@ with HasCollection => { type => 'Int' };