+++ /dev/null
-----
-presentation_topic: meta meta meta meta
-presentation_title: Object Meta Programming
-presentation_place: YAPC::EU::2007
-presentation_date: Aug 29, 2007
-----
-= HAI FRENDS
-{image:http://personal.inet.fi/taide/junttila/desert/2002/promopi.jpg}
-== My name is Yuval
-----
-= Meta Programming
-{image: http://www.prints.co.nz/Merchant2/graphics/00000001/7104_Squares_with_Concentric_Circles_Kandinsky_Wassily.jpg}
-----
-= Introduction
-{image: http://www.room101.net/door.jpg}
-+* Meta programming
-+* writing /code/ which /outputs/ or /manipulates/ /code/
-----
-= Many forms
-{image: http://www.internationalhero.co.uk/m/manimal.jpg}
-+* string `eval`
-+* `%::`
-+* closure generators
-+* macros
-+* real macros
-+* compilers
-----
-= Many forms
-{image: http://www.junjan.org/weblog/images/Flying_Spaghetti_Monster-thumb.jpg}
-+* Home grown snippets
-+* Home grown packages
-+* Stuff on the CPAN (e.g. `Class::Accessor`, `Code::Perl`)
-+* Large systems (`Template::Toolkit`)
-----
-= Summary
-{image: http://www.evc.org/programs/TD_web_projects/westside_amy_2003_1/teen_times/peerpressure/images/16_peer_pressure_smoking.gif}
-* You should already know it
-* You probably do it
-+* That's the intended audience anyway ;-)
-----
-= Object Meta Programming
-----
-= Object Meta Programming
-+* Code that outputs or manipulates /object oriented code/
-+* Often written in OO
-----
-= Simple Examples
-{image: http://www.wildoats.com/content/ApplePieSlice.jpg}
-+* `Class::Accessor`, `Class::InsideOut`
-+** Generates accessor methods
-+* `Class::Prototyped`
-+** Prototype object support in Perl
-+* Lots of stuff on the CPAN
-----
-= Modeling OO
-{image: http://www.nordicsubs.co.uk/covers/vogue.jpg}
-+* High level object meta programming
-+** The current trend
-+** The picture illustrates an object modelling with class =)
-+** Seriously though...
-----
-= Modeling OO
-{image: http://www.nordicsubs.co.uk/covers/vogue.jpg}
-* High level object meta programming
-* What is a class?
-+.vim
-filetype: perl6
-
- class Class {
- has @isa;
- has %methods;
- has %attributes;
-
- ...
- }
-.vim
-----
-= Modeling OO
-{image: http://www.nordicsubs.co.uk/covers/vogue.jpg}
-+* Implementing OO
-+** In OO
-+* Meta objects:
-+** Class
-+** Method
-+** Attribute
-----
-= Example class
-
-.vim
-filetype: perl6
-
- class Point {
- has $x;
- has $y;
-
- method distance_to { ... }
- }
-.vim
-----
-= Modeled with objects
-
-.vim
-filetype: perl
-
- Class->new(
- attributes => [
- Attribute->new( name => '$x' ),
- Attribute->new( name => '$y' ),
- ],
- methods => [
- Method->new(
- name => "distance_to",
- definition => sub { ... }
- ),
- ],
- );
-.vim
-----
-= Metamodel Services
-{image: http://www1.istockphoto.com/file_thumbview_approve/944779/2/istockphoto_944779_reception_bell.jpg}
-+* Form
-+** Introspection/Reflection
-+* Function
-+** Class generation
-+** Class transformation
-+* Pattern packaging
-----
-= Case Study
-{image: http://www.iinteractive.com/moose/images/a_moose.gif}
-== Moose
-+* A deep meta object system
-+* 4 layers deep
-+** Syntactic sugar
-+** Custom metaclasses
-+** Class::MOP
-+** Perl's native OO
-----
-= Perl's native OO
-{image: http://www.mileslight.com/images/perl-camel.gif}
-+* Minimalistic
-+** Class = Package = Symbol table hash
-** Inheritence tree embedded in `@ISA` entry
-** `bless` links data to a class
-** `->`
-+* Insanely flexible
-+* Pretty klunky
-+* Written in C (not very accessible)
-----
-= Class::MOP
-{image: http://nothingmuch.woobling.org/MOP.jpg}
-+* port of CLOS, more or less
-+* MOP = Meta Object Protocol
-----
-= Class::MOP
-{image: http://nothingmuch.woobling.org/MOP.jpg}
-+* Model
-+** `Class::MOP::Class`
-** `Class::MOP::Method`
-** `Class::MOP::Attribute`
-+* Easy interface
-+** Introspection
-+** Transformation
-----
-= Class::MOP
-{image: http://nothingmuch.woobling.org/MOP.jpg}
-+* Can "parse" packages into meta objects
-+* Modifying the objects writes back to packages
-+* Code generation
-+** Accessors from attributes
-+** Constructor from attributes
-+** Method modifiers
-----
-= Moose's custom metaclasses
-{image: http://www.iinteractive.com/moose/images/a_moose.gif}
-+* Subclasses of `Class::MOP::Class` et al
-+* More fun features
-+** Roles
-+** `BUILD` etc a la Perl 6
-+* Type constraints
-----
-= Moose sugar layer
-{image: http://nothingmuch.woobling.org/sugar.jpg}
-+* Pseudo-declarative syntax
-+* Maps to metaclass manipulations
-+.vim
- has foo => ( is => "rw" );
-.vim
-+* becomes
-+.vim
- $metaclass->add_attribute(
- Moose::Meta::Attribute->new(
- foo => ( is => "rw" ),
- )
- );
-.vim
-----
-= Moose vs. Class::Accessor
-{image: http://nothingmuch.woobling.org/p-seal-at-toronto-zoo.jpg}
-+* All that bloat just for the `has` syntax?
-+* *NO!*
-+* Pattern packaging
-----
-= MooseX::
-{image: http://www.threadpit.com/photos/all_styles/small/401.jpg}
-+* Packaged meta code
-+* Pretty clean
-+* Mostly composable
-----
-= MooseX::
-{image: http://www.threadpit.com/photos/all_styles/small/401.jpg}
-+* `MooseX::Storage`
-+** Customizable serialization through metaprogramming
-+* `MooseX::AttributeHelpers`
-+** Additional methods for collection type attributes
-+* `MooseX::Getopt`
-+** Additional constructor compiles attributes into a `Getopt` spec
-+* `MooseX::IOC`
-+** Inversion of control integrated into the object system
-----
-= The point of Moose
-{image: http://nothingmuch.woobling.org/cute_moose.jpg}
-+* OO is less tedious
-+* Helps you write meta code
-+** Good APIs promote clean code
-+** Easier to build on existing base
-+** Conventions and structure let you play well with others (`MooseX::`)
-+** Introspectable & tranformable metamodel
-----
-= Another Case Study
-{image: http://www.rockies-ice.com/images/MainHeaderPic_5.gif}
-== ORMs
-+* Are *HARD*
-+* Not even fun like the picture
-----
-= ORMs
-{image: http://www.agiledata.org/images/legacyDataSources.jpg}
-+* Modeling
-+** Tables <-> Classes
-+** Fields <-> Attributes
-+* Code Generation
-+** SQL
-+** Accessors
-+** Relationship fetchers
-----
-= `Class::DBI`
-+* Meta code is in the base class
-+* No clear schema modelling
-+* No separation between regular & meta code
-+* Lots of hacks
-+* Don't go there
-----
-= `DBIx::Class`
-+* Meta enlightened
-+** Schema objects fully model the SQL side
-+** ResultSource etc partially model the OO side
-+** Components for everything
-----
-= `DBIx::Class`
-+* Meta code:
-+** Proxy objects
-+** Accessors
-+** Code generation (SQL, Perl)
-----
-= ORM related meta programming
-+* Complex
-+* But manageable
-----
-= Vaporware
-{image: http://www.nzgeothermal.org.nz/geothermal_energy/images/big/b-silencer-water-vapour.jpg}
-----
-= MO
-{image: http://www.nzgeothermal.org.nz/geothermal_energy/images/big/b-silencer-water-vapour.jpg}
-+* My baby
-+* Moose spinoff
-+** Stevan says it's Moose 2.0's
-+* Perl 5 & Haskell (in pugs)
-----
-= MO Sucks
-{image: http://www5f.biglobe.ne.jp/~tantan-kids/I.syokuzai/lollypop.jpg}
-+* Experimental code
-+* Boring parts messy or unwritten
-+* Lacking integration, sugar layer
-+** mst promised to help ;-)
-+* Some parts slow as $*!&%
-----
-= MO Rocks
-{image: http://nothingmuch.woobling.org/rocks.jpg}
-+* Purely functional
-+* Very suited for meta transformations
-+* Fine grained control over everything
-+* Can introduce entirely new conceptions of OO
-----
-= MO Architechture
-{image: http://www.narrabay.com/images/engineering_large.jpg}
-+* Modeling layer
-+** Corresponds to compilation
-+* Responder layer
-+** Corresponds to runtime
-----
-= MO Architechture
-{image: http://www.narrabay.com/images/engineering_large.jpg}
-+* Compiler/sugar layer creates the modeling layer
-+** Class objects are constructed, with all the details
-+** No meta calculations happen yet
-+* Modeling layer is "compiled" into responder layer
-+** Can be done on demand or upfront
-+* Obscurely named objects
-+** Bear with me
-----
-= "Concepts"
-{image: http://gallery.hd.org/_exhibits/light/_more2003/_more05/light-bulb-glowing-filament-light-blue-uncropped-lores-3-AHD.jpg}
-+* The purest form of OO is prototypes
-+** prototype OO can implement class OO
-+* Concepts are new ways to express objects
-+* A class is a concept
-+* A role is a concept
-----
-= "Responder Interfaces"
-{image: http://www.cs.usfca.edu/~parrt/course/652/lectures/images/vtable.jpg}
-+* `$ri->dispatch( $responder, $invocation )`
-+* Generated from concepts
-+* Abstract VTable
-+** The flattened method hierarchy
-+** ... or something completely different
-+** Performance
-+** Flexibility
-----
-= "Responders"
-{image: http://www.maine.gov/spo/flood/images/fema_seal.gif}
-+* Something that is the subject of invocations
-+** An object instance
-+** A class (class methods)
-+* A simple tuple `( $data, $ri )`
-----
-= "Invocations"
-{image: http://www.mobilenews.sk/wp-content/lg-banana.jpg}
-+* A method call, multimethod, message... whatever
-+** Arguments, too
-+* Whatever an RI will put up with
-+** Extensible calling semantics
-----
-= MO compilation flow
-{image: http://www.daveltd.com/photo/rolls/digital/water/waterfalls/snoqualmie-falls/snoqualmie-falls-flowing-3811-equalized.jpg}
-+* Instantiate a `Class` object
-+** Specify members (methods, attributes)
-+** ... and ancestor classes & roles
-+* Compile class
-+** `my $class_methods_ri = $class->class_interface()`
-+** Instance method RI closed in the constructor, within `$ri`
-+** Purely functional operation
-----
-= RI composition
-{image: http://www.daveltd.com/photo/rolls/digital/water/waterfalls/snoqualmie-falls/snoqualmie-falls-flowing-3811-equalized.jpg}
-+* Compute instance methods and attributes from ancestry
-+* Compute instance slots from attributes
-+* Generate accessors
-+.vim
- MO::Run::ResponderInterface::MethodTable->new(
- methods => %methods
- );
-.vim
-+* Generate constructor
-+.vim
- sub {
- my $data = process_params(@_);
- return box( $data, $instance_ri );
- }
-.vim
-----
-= Instantiation
-{image: http://d6044171.u109.worldispnetwork.com/images/Creation-hands-L.jpg}
-+* Lookup RI using class name
-+* Dispatch constructor class method
-+* Compose data from params
-+** Slightly complicated
-+* Link data with closed `$instance_ri`
-+** Responder == ( Data, RI )
-+** Like `bless`
-----
-= Method calls
-{image: http://www.w3.org/2005/Talks/05-maxf-xtech/telephone.jpg}
-+* How to talk with your new object?
-+.vim
- my $ri = $responder->responder_interface;
-
-
-+ my $method = MO::Run::Invocation::Method->new(
- name => "foo"
- arguments => \@blah,
- );
-
-
-+ $ri->dispatch( $responder, $method );
-.vim
-+* Arbitrary responder interfaces also allowed
-+** Doesn't have to be `$responder->responder_interface`
-----
-= OH NOES!!!
-{image: http://www.encyclopediadramatica.com/images/f/f5/Surprise-buttsecks.jpg}
-+* What's wrong with the previous slide?
-+* RIs are objects too!
-+* Need to bootstrap method calls
-+* Runtime must bootstrap low level OO
-+** More on this soon
-----
-= Meta level polymorphism
-{image: http://www.worth1000.com/entries/44500/44790qV87_w.jpg}
-+* An important point
-+** In fact, *the* point of MO
-+* Responder interfaces are polymorphic
-+** Method table, network proxy, whatever
-+* Easy to specialize
-+** Optimizations
-+** Strange features
-+* Easy to mix several OO systems
-+** Just compile to separate RIs
-----
-= MO in Perl 5
-{image: http://www.vetaid.org/assets/shop/card-camel-108.jpg}
-+* Two runtimes
-+* Very different
-+* `MO::Run::Aux` wraps both
-+** Share tests by running with different `%ENV` var
-----
-= Hosted runtime
-{image: http://www.philnjill.com/collections/kubricks/kub_alien/S2Secret.jpg}
-+* Nested object system
-+* Bootstraps with Perl 5
-+** Native Perl OO == Low level, like VM opcodes
-+** Virtualized MO == High Level
-+** Completely separate levels
-+* `$ri->dispatch( $responder, $method )`
-+** not `$responder->$method()`
-+* Full expressiveness
-+* Slow, verbose
-----
-= Native runtime
-{image: http://www.sonofthesouth.net/american-indians/pictures/indian-camp.jpg}
-+* Integrated object system
-+* RIs are compiled into packages
-+** Simple RIs are dissassembled and stuffed into the stash
-+** Complex RIs use `AUTOLOAD`, delegating to the RI meta object
-+* Only named method calls
-+** No arbitrary call concepts
-+** `->` doesn't support anything else
-+* As fast as "regular" Perl OO
-+** Even makes simple, standalone `.pmc`s
-----
-= Perl 5 Runtimes
-+* Native
-+** Usable with regular Perl OO {html:☺}
-+** Lacks arbitrary invocations {html:☹}
-+* Virtualized
-+** Feature complete {html:☺}
-+** Doesn't integrate {html:☹}
-+** Slow {html:☹}
-----
-= Idealized MO toolchain
-{image: http://www.ibiblio.org/wm/paint/auth/botticelli/botticelli.venus.jpg}
-+* Compiler handles modeling
-+** Constructs meta objects at compile time
-+* VM Opcodes support standard RI
-+* Custom RIs are just objects
-+** Bootstrapped using standard runtime objects
-+*** Method table RI
-+*** Named method invocation
-----
-= Perl 6
-{image: http://lolgeeks.com/wp-content/uploads/2007/05/lolgeeks016.jpg}
-+* Perl 6 is the idealized MO toolchain
-+** Can introduce syntax
-+*** Invocation types
-+*** Concept declarations
-+** Implement bootstrap RIs in VM opcodes
-+* Pugs might be using MO
-+** I'm not really sure
-+** It was ported a while ago
-----
-= Introducing new concepts
-+* Roles are the shit
-+* But what about next week's fad?
-+* MO lets you introduce a new concept
-+** Arbitrary at compile time
-+** RI protocol at runtime
-----
-= Example - Prototype Objects
-+* One shared RI
-.vim
- sub dispatch {
- my ( $object, $invocation ) = @_;
-
- my $method = $object->{ $invocation->name };
-
- $object->$method( $invocation->arguments );
- }
-.vim
-----
-= Example - Attribute Grammars
-{image: http://nothingmuch.woobling.org/village_people.jpg}
-+* Crazy stuff from the 1970s
-+* Renewed interest in {html:λ} land
-+* Was pretty easy in MO
-----
-= Attribute Grammer Implementation
-{image: http://grammar.ccc.commnet.edu/grammar/images/grammar.gif}
-+* Introduce new concept objects
-+** Attribute Grammar
-+** Attribute Grammer Instance - one per AG per class
-+* Runtime specialized RI
-+** Shadows any RI with additional context sensitive methods
-+* Additional runtime support code
-----
-= MO TODO
-{image: http://www.constructionownerslawblog.com/checklist.jpg}
-+* Write a sugar layer
-+** Make it fun to use
-+* Tests
-+* Refactor the Class objects
-+** Bloated example code
-+** There are some patterns to extract
-+* Self hosting
-----
-= Self Hosting
-+* Easier to maintain MO written in Moose
-+* Need to have clean syntax
-+* Stable `.pmc` compilation
-----
-= Conclusion
-{image: http://www1.istockphoto.com/file_thumbview_approve/2540021/2/istockphoto_2540021_painted_exclamation_mark.jpg}
-+* Meta code is awesome code
-+** Especially my meta code ;-)
-----
-= Conclusion
-{image: http://www1.istockphoto.com/file_thumbview_approve/2540021/2/istockphoto_2540021_painted_exclamation_mark.jpg}
-* Meta code is awesome code
-+** Lets you program in new ways
-+** Helps you take care of your other code
-+* Meta code is important code
-+** It can affect *anything*
-+** Keep it minimalistic, and clearly defined
-+** No spaghetti monsters
-+* Meta code can be simple
-+** Only complicated if you aren't careful
-----
-= BIE FRENDS
-{image: http://www.girlscoutsofblackhawk.org/Portals/0/webphotos/thanks.jpg}
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projects / gitmo/moose-website.git / commitdiff