Catalyst 1   Introduction
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Catalyst 1 Introduction

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    Catalyst 1   Introduction Catalyst 1 Introduction Presentation Transcript

    • Catalyst Intro I short introduction to what catalyst is.
    • Introduction
      • A complete web site framework for Perl.
      • Comparable to Ruby on Rails and Java Struts.
      • Robust and proven.
      • Uses and enforces the MVC design pattern.
    • MVC
      • MVC is a design pattern that was originally designed for interactive application development, like Visual Basic.
      • M is the Model and is generally the database layer.
      • V is the View and in web development it normally consists of HTML.
      • C is the Controller which contains all of the business logic written in Perl/Ruby/PHP/etc.
    • View
      • The view provides an interface for the user to interact with the system.
      • The view contains minimal business logic.
      • The view never modifies the model directly, but it may read from the model directly.
    • Controller
      • The controller implements all of the business logic.
      • The controller prepares information from the model and passes it to the view.
      • The controller take data from the view and passes it to the model.
    • Model
      • The model stores the current state of the application.
      • The model is manipulated by the controller.
    • Structure
      • A Catalyst app consists of a set of perl modules that all reside under a namespace for that app, such as “MyApp”.
        • MyApp This module holds all of the configuration information about the application.
        • MyApp::Model::* Contains a class for each type of model being used in this application.
        • MyApp::View::* Contains a class for each type of view being used.
        • MyApp::Controller::* Contains a class for each controller.
    • Basic Request Cycle
      • A request is made for: http://pets.com/inventory/purchase
      • Catalyst finds a handler: Controller::Inventory::Purchase->index() or, if not found, it looks for: Controller::Inventory->purchase()
      • Auto-handlers are executed.
      • Requested handler is executed.
        • Data is gathered from the model.
        • Model is updated with any changes.
      • Handler turns control over to the view.
    • More on Catalyst
      • Supports whatever model classes you want to use such as: Class::DBI, Rose::DB, DBI, DBIx::Class, LDAP
      • Supports many different view classes such as: Mason, TT, PHP, EmbPerl
      • Has a extensive library of plugins on CPAN.
      • Large community of users and contributors.
      • New features in active development (Combust, Moose).
    • Resources
      • MVC @ Wikipedia http://en.wikipedia.org/wiki/Model-view-controller
      • Catalyst Manual @ CPAN http://search.cpan.org/~mramberg/Catalyst-Runtime-5.7012/lib/Catalyst/Manual.pm