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The Definitive Guide to Catalyst: Writing Extensible, Scalable and Maintainable Perl–Based Web Applications

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The Definitive Guide to Catalyst: Writing Extensible, Scalable and Maintainable Perl–Based Web Applications (Paperback)

~ (Author), Matt Trout (Author)

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Product Description

Learn to build web applications with Catalyst, the popular open source web framework based on the Perl programming language. The Definitive Guide to Catalyst: Writing Extendable, Scalable, and Maintainable Perl–Based Web Applications is a definitive guide to Catalyst version 5.8, which will be released in 2009. This book contains

Training materials for new and experience programmers.
Worked examples and cookbook–style recipes of common web application programming tasks
Fundamentals of web application design and best–practice application style

What you’ll learn

Write web applications with Catalyst and Perl.
Design for extendability and code reuse.
Understand deployment options for high– and low–traffic sites.
Use DBIx::Class, Moose, and Template Toolkit.
Understand the Catalyst dispatcher and request cycle.
Deal with common web programming requirements: authentication and authorization, web services, sending e–mail, serving streaming media.

Who is this book for?

The primary audience for this book is existing Perl programmers who want more information on writing robust maintainable and extendable web applications. This group is comprised of four subgroups:

Experienced perl programmers wanting to update their web programming skills (for example, CGI.pm, mod_perl, and Mason programmers)
Intermediate/Late beginner programmers wanting to learn rapid, extendable, maintainable web programming techniques in Perl
System administrators and other non–web users of Perl (e.g., bioinformatics workers) who want to learn modern Perl web development techniques
Existing catalyst programmers who want to learn about best practices for catalyst development

This book is also for programmers who want to understand web application design and development more thoroughly.

About the Author

Kieren Diment is a social researcher in the School of Management and Marketing, University of Wollongong, Australia, where he uses Catalyst for the collection analysis and presentation of research data. He has taken the lead in a significant portion of the Catalyst documentation including the Catalyst Advent Calendar in 2006 and 2007. His focus has been on ensuring a culture of documentation by example in the project, and ensuring that instructional documentation points to working example code wherever possible.

Matt S Trout is technical director of Shadowcat Systems Limited, an open source–focused consultancy based in Lancaster, England specializing in helping clients with design, development, and deployment of Catalyst– and DBIx::Class–based applications. He is the second longest standing member of the Catalyst core team and focuses on architecture, program management, and ease of installation and deployment of Catalyst and Catalyst–based applications.

Product Details

Paperback: 362 pages
Publisher: Apress; 1 edition (July 9, 2009)
Language: English
ISBN-10: 1430223650
ISBN-13: 978-1430223658
Product Dimensions: 9 x 7 x 1 inches
Shipping Weight: 1.2 pounds (View shipping rates and policies)

Average Customer Review: 4.0 out of 5 stars See all reviews (7 customer reviews)

Amazon.com Sales Rank: #80,437 in Books (See Bestsellers in Books)

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4 of 4 people found the following review helpful:

5.0 out of 5 stars Definitive Guide to Modern Perl Development, September 12, 2009

By	David Cross "davorg" (London, UK) - See all my reviews (REAL NAME)

Catalyst is one of the most interesting projects to come out of the Perl community in the last few years. Originating as a fork of the Maypole web framework, Catalyst has grown into the de facto standard for building web application using Perl. Its power and flexibility make it a great choice for many web-based projects.

But often great power and flexibility goes hand in hand with complexity. I've used Catalyst in simple ways on a couple of projects but I had always suspected that I wasn't getting everything that I could out of the software. What I really needed was a good book that explained the best way to get the most out of Catalyst. With this book I think I've got what I was looking for. The book is written by two core members of the Catalyst team. They obviously know exactly what they are talking about and lead the reader confidently through the complexities of Catalyst.

Catalyst, like other well-known web frameworks like Django or Ruby on Rails, uses the Model-View-Controller (MVC) pattern. This book doesn't assume that you are already familiar with this pattern and chapter 1 explains the underlying concepts in some detail. It also takes time to compare the Catalyst way of doing things with CGI applications and to compare Catalyst itself with other Perl frameworks like CGI::Application and Jifty.

Chapter 2 gets you started by discussing how to install Catalyst. This can be difficult as Catalyst requires a large number of other Perl libraries to be installed, and this section explains the easiest way to do with by using Perl's built-in features. This chapter also contains an introduction to Object Oriented programming in Perl using Moose. This is indicative of the authors' dedication to promoting modern Perl best practices and it's a topic I shall return to later.

Chapter 3 moves on to writing a simple application in Catalyst. Once again the authors' interest in best practices is evident as the application is not only written using Moose, but also has a comprehensive test suite. The application built in this chapter is pretty simple and some corners are cut in order to get something written as quickly as possible. These shortcomings are addressed at some length in chapter 4 where the application is rewritten in order to make it easier to maintain and extend.

Having written an application using Catalyst's built-in development web server, you will next need to deploy it. Chapter 5 takes a detailed look at your options for deploying Catalyst applications on a range of popular web servers.

The next two chapters look at two important parts of the Catalyst framework. Chapter 6 looks at database models, concentrating on the use of DBIx::Class - the most popular database abstraction layer used with Catalyst (and, indeed, with Perl itself). Chapter 7 looks at Catalyst's dispatch model - how a Catalyst application decides which of its method need to be called to respond to a given request. In earlier chapters I felt that some of the details of the dispatch model had been rather skimmed over, but this chapter more than makes up for that.

Chapter 8 looks at another vital part of modern web applications - that of authentication and authorisation. Catalyst has a number of plugins which makes these activities as easy as I have seen in any web framework. Chapter 9 looks at web services - both how to consume external services in your application and how to make a web service API available to users of your application. The latter becomes ridiculously easy with Catalyst.

If there is something that you don't think that Catalyst can do for you, then you'll find Chapter 10 useful as it examines a number of ways to extend Catalyst's behaviour. There are already dozens of add-ons and plugins available for Catalyst, but this chapter gives clear instructions on how to add to this collection.

Chapter 11 is a useful cookbook of recipes that will help you be more efficient in your use of Catalyst. Some of them solve common problems that you'll come across when writing applications but another, more interesting, section talks about ways to just become a more efficient developer. Many of these (for example, using Perl::Tidy and Perl::Critic) are general development techniques that aren't specific to Catalyst. Finally, chapter 13 looks at Reaction, which is a higher level framework which is based on Catalyst.

One of the problems with writing books about a project like Catalyst is that in the early days of a project, things can change very quickly. Sometimes so quickly that a book is out of date before it is published. I think that Catalyst has now settled down from the intense development cycles of the last few years, so this book will be relevant to Catalyst users for quite some time.

I'm convinced that Catalyst will be a useful tool to add to my collection and that this book will be very useful while I'm getting myself up to speed with writing applications with Catalyst. It's also very likely to be useful as a reference long after I'm familiar with how Catalyst works. If you're looking at writing a web application and are looking for a framework to use then this book should convince you to add Catalyst to the list of possibilities that you consider.

If you're a Catalyst user or a potential Catalyst user then you don't really need me to tell me that this book will be well worth buying. But there's another group of people who I would highly recommend this book to - and that's everyone who is currently programming in Perl, even if you never go near web developement or Catalyst. The reason for this seemeingly bizarre recommendation is easy to explain. Perl has been changing a lot over the last five years. The basic syntax remains (mostly) the same, but a number of new tools have been introduced that every Perl programmers should be looking at. Perl books don't get published as frequently as they used to and this is (as far as I know) the only book which emphasises new Perl tools like Moose and DBIx::Class. There is a whole new Perl movement out there called Modern (or Enlightened) Perl and this book is the best introduction to this movement currently in print.

The application development methods discussed by the authors of this book are the ones which will define good Perl development practice in the coming years. If you have any interest in how you should be developing Perl applications then you should be buying this book.

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4 of 4 people found the following review helpful:

5.0 out of 5 stars Catalyst - Now with more awesome!, July 22, 2009

By	Devin J. Austin "Catalyst Hacker" (Denver, Colorado) - See all my reviews (REAL NAME)

I'm the maintainer and refactor-er of the Catalyst::Helper namespace. That said, I should know a great deal about Catalyst. With THAT said, after even my first skim of this book, I picked up some great tips that I had not thought of or stumbled upon before. The collaboration between the authors and the attitude of "no less than excellent" each one of them has led to this being an extremely in depth, informative, and must-have resource for novice, experienced and non-Catalyst developers alike. Not only will you learn how to use the premier Perl web framework, but you will improve your Perl hacking skills as well.

From your first line of Catalyst, to deployment, to maintenance, you will learn how to create Catalyst applications the right way, the scalable way, and the easy way.

Kudos to each and everyone one of the authors, and the Catalyst community for making this such a great book.

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3 of 3 people found the following review helpful:

4.0 out of 5 stars Informative & Substantial, August 27, 2009

By	Matsch Systems "Steve Schafer" (Michigan, USA) - See all my reviews (REAL NAME)

This book is probably a bit over my head at this point, as I have only written 100 or so scripts over the past year and a half, but it has proven to be a very informative introduction to web application programming with Catalyst. Of particular interest to me was the philosophy behind Catalyst. I felt the book did an outstanding job of not only telling me why Catalyst is a great tool, but also showing me why. I've also been impressed by the consistency in various messages concerning the use of Catalyst: There is a learning curve, it is not an 'out of the box' solution or panacea for web development. As I've heard Mr. Trout say on several occasions, "RTFM"! It is extremely informative as well. I wonder if the Perl Mongers will embrace this tool???

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Most Recent Customer Reviews

2.0 out of 5 stars Incremental to the POD documentation, but disappointing.
I've used Perl for about ten years, and have experience with all of the "pre-Catalyst" frameworks and helpers (from CGI. Read more

Published 27 days ago by Fake Name

5.0 out of 5 stars Great book on modern Perl, Catalyst
This is a great book not only for Catalyst but also for modern Perl. Perl usage has evolved over the last years, and this book covers techniques and modules that are the most... Read more

Published 1 month ago by Sanjay Mishra

2.0 out of 5 stars Presentation of the example code in the book could be much better
I am very familiar with both Perl and web development, but found that I couldn't read this book when away from a computer. Read more

Published 1 month ago by Craig Ogg

5.0 out of 5 stars Finally a best-practices book for one of the best MVC frameworks out there!
After the somewhat disappointing first book on Catalyst by J. Rockway, this one really covers all important aspects of one of the best MVC frameworks that are currently available... Read more

Published 3 months ago by Tobias Kremer

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