Multimethods
Normally I save up blog posts and consolidate them into long ones, but apparently we get to see mst++ cross-dress if I blog once a week. So this post will be less content-rich than usual, but it's for a good cause. Anyway, I started writing a new application tonight called PleasureChicken. The details of what PleasureChicken does is an article for another day, but basically, any entity in Pleasure
Unshortening URLs with Modern Perl
Tiny URLs, like the ones Twitter uses, have been stirring up a lot of controversy lately. People wonder what will happen if the tiny URL service goes down, goes away, or goes rogue. The links in their Twitter posts could become useless, and that would be tragic. This is a problem that's easier to work around than to whine about, so I've implemented a web service that unshortens any short URL. You
Ernst, Angerwhale, the Future of Perl Web Frameworks, and Deleted Email
Ernst, Angerwhale, the Future of Perl Web Frameworks, and Deleted Email The other day, someone emailed me about Ernst. I thought I marked the email as "reply to soon", but I actually deleted it. Oops. Anyway, if you are that person, please get in contact with me again, I'm really sorry for deleting your email. With that in mind, I thought I'd write a little about my plans for the future with respe
Catalyst server aliases
I generally avoid blog posts that are less than a million words, but today you are in luck; I am just going to share two shell aliases that I find quite helpful for Catalyst development: alias cs="perl script/*_server.pl -d" alias carpcs="perl -MCarp::Always script/*_server.pl -d" cs will start the Catalyst server for the app in the current directory. carpcs will make all warnings/dies give a full
Plugging a leaky whale
I fixed the Angerwhale leak. The main problem was knowing where to look for the leak, but Alias++'s Devel::Leak::Object cleared things right up. I ran angerwhale like this: ANGERWHALE_EXIT_OK=1 perl -MDevel::Leak::Object=GLOBAL_bless script/angerwhale_server.pl -d Then I hit it a few hundred times to exaggerate the per-request leaks: ab -n 300 http://localhost:3000/ Then I told it to exit, so I co
Why I stick with Perl
This is Jonathan Rockway's blog, where he talks about Angerwhale, Catalyst, and Everything. I noticed a discussion about Perl on Hacker News this morning. The linked article is about why the author likes Perl. As with all articles of this type, it attracted the usual "Ruby is better!!" comments. The Hacker News discussion is slightly more intelligent, arguing that Perl is ugly, that the article's
Git merging by example
This is Jonathan Rockway's blog, where he talks about Angerwhale, Catalyst, and Everything. UPDATE (28 Apr 2008): So apparently this article made it to the front page of delicious, reddit, and hacker news. It's always the ones I least expect :) Anyway, I've updated the branch names to be less confusing, and I've added an explanation of why I say git ci instead of git commit; I have the following s
Adding methods at runtime
Something people often want to do is add methods to a specific instance of a class. For example, if you have a web request, you might want to introspect it and add a "deserialize" method if it's a REST request with serialized data. However, you don't want other instances of the Request class to have that method. In this article, we'll see how such a thing is possible. Let's start with a simple (an
Catalyst book code
For a while, people have been requesting runnable code for the apps in my book. It has actually been available for a while, but apparently doesn't show up in Google results. It's because there is book called "Catalyst Code" that obscures results for the logical catalyst book code queries. Amusing. Anyway, every application (in runnable form) is available here: http://jrock.us/Catalyst-Book-Code-
Adding more methods
Since I'm not in jail yet (for quoting Tim Bray), I thought I would share another method (heh) for adding methods to instances. Here's my last article, in case you missed it: http://blog.jrock.us/articles/Adding%20methods%20at%20runtime.pod Class::MOP::Class (from which Moose::Meta::Class, the Moose metaclass, inherits) has a function called create_anon_class that will ... create an anonymous clas
Myth: Moose is an unnecessary dependency
It always strikes me as odd how people single out Moose as a dependency they're afraid to use or introduce into their application. One of the arguments I've heard is "I don't want to make something overly complex with dependencies that don't relate to the task". I think this view is misguided, because the alternative is to add unnecessary code and tests to your application. The best code is code t
Check your modules against 5.10
Now that 5.10 is out, you might want to check that your modules still work. I wrote a script (cpancheck.pl) that will test every module in a directory. Run it like this: $ cd ~/projects/cpan_modules $ cpancheck.pl And get output like: Acme-Greek...................................ok Acme-MorningMusume-ShinMember................ok Acme-Read-Like-A-Monger......................ok Algorithm-IncludeExcl
Introducing App::TemplateServer
Sometimes you want to be able to view rendered HTML templates without having a big Apache or Catalyst application do it. You might want to play with a fun new engine you heard about, or perhaps you want to give your web designer the templates and a renderer to work on while on a plane. Well, now you can install App::TemplateServer from the CPAN and do just this. Let's say you have a TT template li
Visualizing your DBIC schema
If you want a somewhat pretty picture of your DBIC schema (with relationships drawn, of course), install GraphViz, SQL::Translator, and DBICx::Deploy from the CPAN, and then run: $ dbicdeploy -Ilib MyApp::Schema ~/graphs GraphViz ~/graphs will then contain a .sql file that is actually a png of your schema. Rename it and see your schema in your favorite png viewing application. Oh yeah, the post ne
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Mixing Class::C3 and NEXT
Catalyst + Cache