X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=moose-class%2Fslides%2Findex.html;h=056d33b8459a696a7965458ae45ab880ecc14014;hb=a575fa9c8324958c05ae5a69a2d98aa907066ef8;hp=ca21a08f32393ef4e2a893aab9f21fcc3ad3421a;hpb=c31b1deab0210ecbbab1c1efdf800cd12f7847af;p=gitmo%2Fmoose-presentations.git
diff --git a/moose-class/slides/index.html b/moose-class/slides/index.html
index ca21a08..056d33b 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;}
- Declarative OO sugar
- Introspectable
- - Extensible (177 MooseX::* on CPAN)
- - Community approved (1222 downstream dependents on CPAN)
+ - Extensible (202 MooseX::* on CPAN)
+ - Community approved (1200+ downstream dependents on CPAN)
@@ -155,7 +155,7 @@ img#me05 {top: 43px;left: 36px;}
package Person;
use Moose;
-has first_name => ( is => 'rw' );
+has first_name => ( is => 'ro' );
@@ -893,8 +893,8 @@ use Moose;
BUILDARGS
- - Takes
@_
, returns a hash reference of attribute name/value pairs
- - Accepts a hash or hashref; throws otherwise
+ - Processes
new
's @_
, returns a hash reference of attribute name/value pairs
+ - Accepts a hash or hashref; errors otherwise
- Provide your own for other cases
- Always call
$class->SUPER::BUILDARGS(@_)
as a fallback!
@@ -950,10 +950,10 @@ sub BUILD {
Object Construction a la Moose
-
Person->new(@_)
+
Person->new(@args)
- - Calls
Person->BUILDARGS(@_)
to turn @_
into a hashref
+ - Calls
Person->BUILDARGS(@args)
to turn @args
into a hashref
- Blesses a reference
- Populates attributes based on the hashref from #1
- Calls
$new_object->BUILDALL($constructor_args)
@@ -968,6 +968,7 @@ sub BUILD {
- Technically it's a hash reference
- If you ever treat it as one you are doing it wrong!
+ - Moose probably provides a feature to do what you need
@@ -977,6 +978,7 @@ sub BUILD {
- Like
DESTROY
, but Moose makes sure all DEMOLISH
methods in a hierarchy are called
- Called in normal inheritance order, children to parents
+ - Never called by you, only by Perl itself
@@ -1030,7 +1032,7 @@ extends 'LWP';
No DEMOLISH()
- But see MooseX::NonMoose
for a workaround
+ But MooseX::NonMoose
fixes all of this
@@ -1052,13 +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();
+};
@@ -1067,7 +1069,7 @@ use Moose;
- Mostly like
$self->SUPER::work(@_)
- But cannot change
@_
!
- - Binds the parent's method at compile time
+ - Binds the parent's method correctly at compile time
- Parent determined by checking
Child->meta()->superclasses()
@@ -1153,8 +1155,8 @@ Person->can('extends');
Cleaning Up Moose Droppings
package Person;
-use namespace::autoclean;
use Moose;
+use namespace::autoclean;
...
@@ -1232,7 +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
@@ -1305,23 +1307,25 @@ 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();
@@ -1338,7 +1342,9 @@ print $person->full_name
package Person;
use Moose;
-with 'Printable';
+
with 'Printable';
+
+sub as_string { $_[0]->first_name() }
@@ -1349,6 +1355,8 @@ use Moose;
with 'Printable';
+sub as_string { $_[0]->first_name() }
+
has has_been_printed => ( is => 'rw' );
sub print {
@@ -1477,34 +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';
-
-
- SysadminAssassin
must implement its own execute
- - But loading the
Killer
role by itself does not cause an error
-
-
-
-
Roles as Interfaces
@@ -1527,7 +1507,7 @@ use Moose;
with 'HasSize';
-has size => ( is => 'ro' );
+has size => ( is => 'ro' );
@@ -1541,7 +1521,7 @@ requires 'size';
package Shirt;
use Moose;
-has size => ( is => 'ro' );
+has size => ( is => 'ro' );
with 'HasSize';
@@ -1563,9 +1543,9 @@ with 'HasSize';
package Comparison;
use Moose;
-has [ 'left', 'right' ] => (
- is => 'ro',
- does => 'Comparable',
+has [ 'left', 'right' ] => (
+ is => 'ro',
+ does => 'Comparable',
);
@@ -1654,8 +1634,6 @@ requires 'compare';
Real Examples
has shoes => (
is => 'ro',
lazy => 1,
- builder => '_build_shoes',
+ builder => '_build_shoes',
);
sub _build_shoes {
@@ -2002,7 +1974,7 @@ has account => (
package Person;
use Moose;
-has shoe_size => (
+has shoe_size => (
is => 'ro',
init_arg => 'foot_size',
);
@@ -2020,7 +1992,7 @@ print $person->shoe_size;
package Person;
use Moose;
-has shoes => (
+has shoes => (
is => 'ro',
init_arg => undef,
);
@@ -2044,15 +2016,7 @@ Person->new( shoes => Shoes->new );
- By default, subclasses inherit attribute as-is
- - Can change some attribute parameters in subclasses
-
- - default
- - builder
- - required
- - lazy
- - others we've not yet covered
-
-
+ - Can change attribute parameters in subclasses
@@ -2405,62 +2369,6 @@ around run => sub {
-
Augment and Inner
-
-
- - Inverted
super
- - From least- to most-specific
- - Like Mason's autohandler feature
- - Grandparent to parent to child
- - Not allowed in roles
-
-
-
-
-
Augment and Inner
-
-
package Document;
-
-sub xml { '<doc>' . inner() . '</doc>' }
-
-package Report;
-extends 'Document';
-augment xml =>
- sub { my $self = shift;
- $self->title() . inner() . $self->summary() };
-
-package TPSReport;
-extends 'Report';
-augment xml =>
- sub { my $self = shift;
- $self->tps_xml() . inner() };
-
-
-
-
Augment and Inner
-
-
- - When we call
$tps->xml
...
-
- Document->xml
- Report->xml
- TPSReport->xml
-
-
-
-
-
-
-
Augment and Inner Usage
-
-
- - Call
inner()
to "fill in the blank"
- - Requires designing for subclassing
- - Call
inner()
in the terminal class, just in case
-
-
-
-
Method Modifiers Summary
@@ -2486,21 +2394,7 @@ extends 'Report';
- not call the original method at all (or call a different method)
-
-
-
-
-
Method Modifiers Summary
-
-
- When using modifiers in a role, require the modified method
- - Use
augment
and inner
to invert the normal subclassing flow ...
-
- - Least- to most-specific (parents to children)
- - Build in "insertability" (stick more stuff in the "middle")
-
-
- - Always call
inner
in the most specific subclass to allow for future extension
@@ -2586,15 +2480,12 @@ Item
Bool
True
- 1
-924.1
-'true'
-{}
+ 1
False
0
-0.0
'0'
+''
undef
@@ -2723,7 +2614,7 @@ class_type 'DateTime';
Subtype Shortcuts - role_type
use Moose::Util::TypeConstraints;
-role_type 'Printable';
+role_type 'Printable';
@@ -2832,7 +2723,8 @@ coerce 'My::DateTime',
Coercion Examples
-
coerce 'ArrayRef[Int]',
+ # BAD CODE - DO NOT COPY
+coerce 'ArrayRef[Int]',
from 'Int',
via { [ $_ ] };
@@ -2930,7 +2822,7 @@ 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
@@ -3020,9 +2912,9 @@ coerce ArrayOfInt
use MyApp::Types qw( ArrayOfInt );
-has transaction_history => (
- is => 'rw',
- isa => ArrayOfInt,
+has transaction_history => (
+ is => 'rw',
+ isa => ArrayOfInt,
);
@@ -3206,7 +3098,7 @@ $alice->friend($bob);
has lungs => (
is => 'ro',
- isa => 'Lungs',
+ isa => 'Lungs',
handles => [ 'inhale', 'exhale' ],
);
@@ -3370,7 +3262,6 @@ has history => (
use Moose;
has _favorite_numbers => (
traits => [ 'Array' ],
- is => 'bare',
isa => 'ArrayRef[Int]',
default => sub { [] },
init_arg => undef,
@@ -3433,7 +3324,7 @@ has account => (
isa => 'BankAccount',
handles => {
receive_100 =>
- [ 'deposit', 100 ]
+ [ 'deposit', 100 ],
give_100 =>
[ 'withdraw', 100 ]
},
@@ -3537,6 +3428,10 @@ print Person->meta
+
Questions?
+
+
+
Exercises
# cd exercises
@@ -3567,7 +3462,7 @@ Iterate til this passes all its tests
- Not comprehensive
- - 152 MooseX distributions on CPAN as of 02/02/2010
+ - 188 MooseX distributions on CPAN as of 02/03/2011
- Some of them are crap
@@ -3588,7 +3483,7 @@ 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 =>
@@ -3607,7 +3502,7 @@ 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?)
@@ -3780,7 +3675,7 @@ with HasCollection => { type => 'Int' };
mailing list - moose@perl.org
Slides and exercises are in Moose's git repo:
- git://jules.scsys.co.uk/gitmo/moose-presentations
+ git://git.moose.perl.org/moose-presentations.git