I recently had a discussion with Peter Wolanin about pluggable subsystems. (You can tell this is going to be an exciting entry already, can't you?) Drupal has supported a few pluggable subsystems for a long time, namely the database and cache systems. In both cases, they work on a very simple principle: Conditionally include one of two (or more) files that defines the same set of functions but with different bodies.
That's all well and good and simple, but has some very serious limitations. Most notably, because the same function name is defined twice you can never load multiple versions at the same time. That becomes a problem if you want to, say, connect to a MySQL and PostgreSQL database in the same page request. In addition, Drupal 7 is on track to include a fully introspective code registry for conditional code loading, which, based on earlier benchmarks, should be a huge performance boost. The Registry, however, assumes that all code resources (functions, classes, and interfaces) are globally unique throughout Drupal. Having a given function name defined twice will confuse the poor thing.
That is not an insurmountable problem, or even, truth be told, a difficult one. It simply requires switching from a simple include to a more formal mechanism. There are, in fact, several ways that can be done, so to further the education of the world at large (and probably embarrass myself a bit in front of other architecture buffs) I decided to write a brief survey of simple pluggable mechanisms.
It's the little things that really make or break a system. For instance, earlier tonight a song came up on my playlist in Amarok. I realized the name was misspelled. I corrected the ID3 tag. I then went to the directory where the file was and renamed it. The song was still playing. Amarok noticed and rescanned my collection, updating its records of the new file name, and kept on playing the song without any interruption.
That is how a computer is supposed to behave. :-)
Macs are such drama queens. Always dressed up all in white or all in black, parading around and showing off their icons.
I've been meaning to upgrade the Akismet module on this site for a while now. Of course, I waited so long that another option just appeared, one I've been waiting to see for a while: Mollom.
The other other project from apparent insomniac Dries Buytaert, Mollom is a content filtering service similar to Akismet. I've actually been familiar with it for a long time, as the GoPHP5 project has been running a Mollom private beta since last June. In fact, when Acquia was announced my first thought was "wait, what happened to Mollom?"
Like many things, once you understand how the developers are thinking it becomes quite simple.
A recent thread on the Drupal documentation list has brought up once again the "why don't we have a wiki on Drupal.org?" question. It comes up regularly; you can set your watch by it.
What I've never understood is why anyone would want to take a step backwards from Drupal's handbooks to a simple wiki. How would removing features and capabilities help Drupal's huge pool of documentation?
What exactly makes something "a wiki"? Let's examine:
One of the major changes in Drupal 6 (where "major" is defined as "worthy of a mention in Dries' keynote") was a new feature of the menu and theme hooks. The newly introduced "file" and "file path" keys in those hooks' respective retun arrays. allow them to define files that get included conditionally, only when needed. In theory, that should be a big performance boost; page handlers are virtually never called except for on the page they handle, so loading all of that code on every other page is a waste of CPU cycles. Of course, there is also the added cost of the extra disk hit to load that one extra file we need. Modern operating systems should do a pretty good job of caching the file load, but that may vary with the configuration.
So just how much benefit did we get from two dozen fragile patches that were a glorified cut and paste? And is it worth doing more of it? Let's benchmark it and find out.
So I am finally back from Boston, and have slept off the jetlag and DST change, so I can finally get caught up on writing about Drupal's latest foray into the world of conventions. Sadly I had trouble with the wireless at my hotel as well as at the convention center, so writing anything up before now wasn't really feasible. Drat.
I was actually a bit disapppointed at this DrupalCon; so many amazing talks, and I only managed to see a quarter of them! Hopefully the videos will be online soon, so I'll be able to see what I missed.
I also had an entourage this time. Three of us from Palantir were in Boston; myself, George DeMet, and Tiffany Farriss. We arrived Sunday, the day before the conference. What is a bunch of geeks to do right before a major conference? Eat, of course!
Drupal makes sandwiches happen.
Open source is made of meat.