Aehso’s Output

[Update: Some of the presentation files are now available on the RailsConf Europe website]
Slight delay on writing this one up as I was in transit on Thurs and at a wedding on Friday.  Anyway, this summary is going to be a lot shorter as I didn’t get as much out of Wednesday’s sessions.

Rails Hydra: Synthesizing an Application out of Multiple Rails Codebases (Craig R. McClanahan, Nick Sieger, Sun Microsystems)

Good talk on building services using several Rails applications, the Sun guys also got a chance to demo use of NetBeans 6 for Rails development (with some live demo debugging thrown in along with great audience participation!) Most of the demo centered around making it easier to develop DRY ActiveResource implementations. ActiveResource is almost definitely the right underpinnings for any RESTful service implementation but I think it still needs a bit more work around the edges.

Using a HAXOR Approach for Peace and Productivity (Tim Dysinger)

Good talk on how to manage interaction between designers and developers when developing Rails applications that use HTML, Ajax and XML Over REST. Quite high level (and if I’m honest, I was working away in the background so I couldn’t give it my full attention…)

Browser-based Testing of Massive Ajax-using Rails Applications with Selenium (Till Vollmer)
Good overview of using Selenium to test web applications from within the browser, covering use of Selenium IDE (browser based Javascript IDE), Selenium RC and the Selenium on Rails Plugin. Highlighted that Selenium struggles a bit with testing Ajax heavy web pages but it is possible with hand crafted scripts that use waitForVisible and/or waitForElementPresent events…

Functional JavaScript Development with Prototype (Ben Nolan)
Bit of an edge talk for the JavaScript fanatics but Ben presented well and it seemed well received by the audience…

Ruby on Rails leads you to the e-business (Quentin Tousart)
Mildly interesting talk on experiences gained in building two e-commerce websites using Rails.

Obscure Data Formats, Workflow, and Remote Synchronization (Chad Thatcher)
Another interesting case study on building a Rails front-end for a legacy data format (in this case the RISM format used by the British Library to catalog music manuscripts). Interesting use of composed_of in the Rails model objects to compensate for the fact that the underlying data was in hierarchical rather than relational form.

That’s about it, I met up with Sean Hanley from exoftware and David Rice . Mental note to self, get into RubyIreland…

[Update: Some of the presentation files are now available on the RailsConf Europe website]
Some quick notes from some of the excellent conference sessions that I attended yesterday at RailsConf Europe.  I wasn’t here for the Tutorials on Monday though now I wish I had been - the quality of the presentations (at least the ones I’m picking) is excellent.  Aside, Berlin is a cool spot, I must come back here sometime again to have a decent look around…

Deployment and Continuous Integration from the Trenches, (Fernand Galiana - LiquidRail)

• All about latest developments for Capistrano 2.0 - it seems to have matured considerably in recent months.
• Use multistage_ext
• Use shared project capfiles to keep things DRY
• Use remote repository cache to speed up deployments
• Read Jamis Buck’s blog and the Capistrano Google Group

Really Scaling Rails, (Britt Selvitelle - Twitter)
I’ve seen presentations on Twitter scalability, and even since then they have had a few more high profile outages (at least high profile amongst Twitter users). A couple of interesting takes from this talk:

• Twitter uses Apache, mod_proxy_blancer and mongrel servers
• All user traffic is handled by a single MySQL server. That server does have a slave that can be promoted to master (for redundancy). They have a couple of other MySQL databases for use internally for reporting etc.
• They set mongrel’s num_procs to 1. This means that each mongrel server instance will not queue requests from mod_proxy_balancer - they will only accept one at a time. The side effect is if the concurrent request count > mongrel server count then users start getting error pages. Strangely, they’d rather users got errors than risking loosing queued requests whenever they have to restart a mongrel instance (mongrel apparently waits only 60s before sending itself a TERM signal when shutting down).

Rails Full Text Search with Ferret

A little different to what I was expecting, Ferret provides an indexing service for arbitrary strings (documents), similar to Apache Lucene in many respects.  Worth a look, if you need to support full text search within your rails application.

Tabnav: Do We Really Need a Plugin for Tabbed Navigation? (Paola Dona - Seesaw)

The title of this one was a a bit modest as Paola presented a slew of new Rails Widgets that SeeSaw have developed, all of which seem to be very flexible. Widgets for include tabbed nav (or course), site nav, tables (blocks), nubbins, show/hide blocks, help popups were all demoed. Their widgets integrate very nicely into the rails views/templates - all in all, it looks at least good enough for use in creating rails app prototypes and it appears they might be flexible enough to be embedded into a production application…
The Rest of REST (Roy T. Fielding) - slides

Good historical view of where Roy came from and how the principles of REST have always been such an important underpinning of the IETF’s thinking behind standardization of key web specifications like HTTP, URI and HTML. He provided a good overview of how the web architectural style is defined as a set of constraints:

• client server
• stateless
• caching
• uniform interface
• layered systems
• code-on-demand

There was some interesting discussion on what is missing from Rails though Roy’s first two suggestions drew comments that he might have missed features in Rails that do what he wanted.  His last suggestion, for Rails to guide the developer into using hypertext as the engine for of application state (man they really have to find a shorter name for that!) was a fair comment - seems like an incredibly difficult problem to solve in a generic framework like Rails but as he said, it’d be a first…
Last talk was Craig McClanahan finishing off the day with a short Rails and the Next Generation Web pitch.  Now I hadn’t realised Craig had switched from Java to Ruby development and he seems to be loving it.  Craigs name has all over the Apache code I’ve worked with for years now - he was one of the original Tomcat Catalina & Struts developers and he also co-authored the Servlet and JSF specifications.  He had an interesting anecdote about how the Struts developers all suddenly found themselves working on non-struts based projects…

I’m heading to RailsConf Europe 2007 in the morning for a few days of Rails goodness. If you fancy a meetup (any other Irish devs attending?) do drop me a comment or email me…