I just had to add a note over on PHP.net regarding abstract classes and methods: Object Abstraction.
I'm working on Cgiapp2, which is a PHP5-only implementation of Cgiapp that is built to utilize PHP5's new object model as well as exceptions. One thing I decided to do, initially, was to make it an abstract class, and to mark the overridable methods as abstract as well.
In testing, I started getting some strange errors. Basically, it was saying in my class extension that an abstract method existed, and thus the class should be marked as abstract, and, finally, that this means it wouldn't run.
What was so odd is that the method didn't exist in the extension at all.
So, I overrode the method in the extension… and voila! Everything worked fine.
The lesson to take away from this is quite simple: if the method does not need to be present in the overriding class, don't mark it as abstract. Only mark a method as abstract if:
Now I need to update my source tree…. :-(
Greg Beaver writes in his blog about PEAR, the new PEAR channels, and some issues he sees with PEAR and its developers. Greg is responsible for the latest version of PEAR and the PEAR installer — and for the development of PEAR channels. The particular link referenced above makes reference to a thread on the PEAR-dev mailing list… that I originated, when asking whether or not Cgiapp might be a good fit for PEAR.
At work this week, Rob was doing some monitoring of our bandwidth usage. We have SNMP on each of our servers now, and he uses MRTG to create bandwidth usage graphs that are updated every five minutes or so. He's been monitoring since late last year.
Before January, we had two systems going. The first, legacy, system hosted the majority of the content from garden.org, and was done using Tango 2000, a web application server that ran on top of IIS and Windows NT 4. I say 'ran', because Tango 2000 was the last version to ship; the company that made it stopped supporting it a year later. This meant we could not upgrade our server's OS to Windows 2000 or 2003, nor could we switch to a more secure web server, etc. It was a time bomb waiting to happen.
The second system is a basic LAMP system — Linux + Apache + MySQL + PHP. Rob began migrating applications to it shortly after he started at NGA 3 years ago, one application at a time. Mostly, new applications were placed on it, though in May 2003, he and the other programmer who was there at the time started migrating old applications to the techology. Part of the reason I was hired was to continue this migration.
The migration was time consuming, and plenty of other projects often got in the way. However, starting last July, we made a big push to get it all ported over — before the old WinNT server fails on us. In January, we were able to rollout the new garden.org, which runs on this new technology.
A big reason we were able to finish is because of Cgiapp. I originally ported it to PHP last year around this time, and knew that while I wanted to develop new applications using it, I wasn't so sure I could sell Rob on it.
Amazingly, it didn't take much to convince him. We had already started using Smarty for templates just before this, and were also using OOP in new development. Cgiapp just helped unify these technologies and to provide a nice, standard framework with which to program.
This last can not be emphasized enough. We started developing all applications in three places: an API for data access, a Cgiapp-based application, and our templates. Either one of us could pick up development of an application from the other without having to spend a day or two familiarizing ourselves with the idiosyncracies of what the other had decided was the programming paradigm of the day. Sure, we still have our own programming styles, but the framework makes it easy to debug or extend each others programs painlessly.
Now, back to the bandwidth reports: Rob has noticed that our bandwidth usage has been growing steadily on the new server since we switched garden.org over — a 45 degree line. At one point this week, our outgoing bandwidth was almost 3 T1s — and we were having no performance issues whatsoever. This simply would not have been possible on the old system — nor without Cgiapp. We've managed to produce both a hardware architecture and a programming framework that has proved immensely scalable — which will in turn save the organization money.
I love open source! How else can you create such high-performing software without paying through the nose for it?
So, I did a little experimentation, and I was able to seamlessly integrate Serendipity into my existing website via Smarty, some CSS, and changing just a couple of links!
The result is the website you're currently reading!
This means I can now offer trackbacks, comments, RSS feeds, and all the other stuff a modern blog should offer… and with minimum fuss and with a lot of standards and security. I wish everything I did was this easy.
I've been wanting to improve — no, rewrite — my blogging software for a month
or more now. The more work I've done at work, the more efficiently I've felt I
could handle it. I've learned a lot of ins and outs with
superclasses, and figured out how to tie things together much better. However,
I've also noticed, in reading and analyzing blogs, that there are a lot of
standards that I just don't know enough about or simply don't have the time to
implement ("the more work I've done…" has been something like 70 hour weeks
recently). Things like trackbacks, and RSS/Atom feeds, and comment
moderation/blacklisting, etc. I certainly have the skills, but do I have the
time? Not really. I still have a goal of writing some lightweight blogging
Cgiapp. However, for now, that's on hold so I can focus on
family, myself, and the next round of
Cgiapp improvements. In the meantime,
i've been seeing a lot of stuff about Serendipity, and I
thought I'd give it a try. Here are the results! It was super fast to setup,
and I hope to import all my old entries from my own system to it, once I can
see how entries are stored in the DB. So, you can now keep track of me via
RSS… Read away! Update: I'm liking S9y even more: it uses
Smarty for templating, which means I'm able to modify
it to look like it was always seamlessly in my site!
I couldn't resist… the car model demands it…
For those not familiar with where I live, my family and I live in West Bolton, VT — about 20 miles from Burlington, and at the base of Bolton Mountain. Our daily commute is 4 miles on a dirt road, another 3 to 4 miles on some twisty two-laners at 35mph to the interstate, and around 10 miles on the interstate into Burlington. Then there's all the miles in town getting Maeve to day-care, Jen or myself dropped off, and whomever has the car to work. And we only have one car.
So, you can imagine the crisis when, almost a month ago, our Toyota RAV4 died on the way in to work.
We started it up that day, and it had this funny knocking sound. I remembered a similar sound in my old pickup back in Montana… the one that died. I determined to get it into a shop that day to get it diagnosed. The noise came and went while we were on the backroads, and because it wasn't constant, I figured it couldn't be too serious.
And then we tried to get to highway speeds…. a few miles on the interstate, and it was evident we were in trouble. The Rav was having trouble maintaining 60mph on the way up French Hill — when it normally was able to accelerate past 70mph. And the knocking sound was getting worse and louder.
We resolved to pull off at the first exit, at Tafts Corners in Williston. I pulled into the first gas station there, and as we tried to find a place to park the vehicle, a mechanic was flagging at us to stop the car. He came over to where we parked and said, "Sounds like you've blown your engine."
These, of course, were the absolute last words I wanted to hear.
To make a long story short, apparently a bearing was thrown when we started the engine that day, and because we decided to drive it, we basically destroyed the engine. The cost to replace it: around $6,000.
Now, we're not exactly what you'd call "financially secure". We've had a lot of transitions in the past five years, and except for the past year and a few months, haven't typically both been working at the same time. We've been in a perpetual cycle of having enough to pay the bills… but having to pay consistently late. And we haven't been able to do much, if anything, about our educational debt. In short, our credit sucks. Which means that $6,000 is a big deal.
Did I mention that, at the time of the incident, we still had 17 months left on our car payments?
And, on top of it, I've been in the middle of a huge project for work that's required a fair bit of overtime — and very little wiggle room for personal time?
The timing could not have been worse, either professionally or financially.
We've been very fortunate, however. Jen's parents very graciously offerred to pay off our existing car loan — which helped tremendously. It bought us both the time to figure things out, as well as eliminated one factor that may have barred our ability to borrow towards repairs or a new car. Additionally, a friend of Jen's turns out to be absolutely ruthless when it comes to dealing with car salespeople, and went to bat for us in working out a deal. If it hadn't been for her efforts — and those of the salesperson, who also went to bat for us — we would not have gotten more than a thousand or so for the vehicle; we ended up getting over $3,000 for it, as is. Finally, the finance guy at the dealership advocated for us tremendously so we could get a loan on a new vehicle, with the Rav as our trade in.
So, to conclude: We're now proud owners of a 2005 Toyota Matrix! (And now the mystery of the title is revealed… to all you Matrix fans out there…)
I'll try to get a photo of the car up soon… about the time we update the year-old photos on our site… :-)
Well, it's official: My IT Manager convinced those in the upper echelons (well, considering it's a non-profit with only around 20 employees, that meant the president and the CFO) that (1) he and I need to attend a PHP conference, (2) due to the amount of work we've been putting in to bring money into the organization, cost shouldn't be too much of a deciding factor, and (3) php|Tropics isn't too expensive, especially considering the sessions involved cover some of the very issues we've been struggling with the past few months (PHP/MySQL/Apache and clusters, PHP5 OOP, PHP Security, test-driven development, Smarty, and more).
So, we're going to Cancun in May!
This is incredibly exciting! I've never been to Mexico, nor even a resort, so I'll finally get to find out what my wife and friends have been talking about all these years. Plus, the conference is top-notch — many of the presenters are well-known in the PHP community, and have blogs I've been following for the past year. (I only wish that Chris Shiflett's PHP Security series wasn't running head-to-head with the PHP5 OOP Extensions and PHP 5 Patterns sessions; I suspect Rob and I will have to do a divide-and-conquer that day.)
Drop me a line if you'll be attending — I'm looking forward to meeting other PHP junkies!
I've been extremely busy at work, and will continue to be through the end of March. I realized this past week that I'd set a goal of having a SourceForge website up and running for Cgiapp by the end of January — and it's now mid-February. Originally, I was going to backport some of my libraries from PHP5 to PHP4 so I could do so… and I think that was beginning to daunt me a little.
Fortunately, I ran across a quick-and-dirty content management solution yesterday called Gunther. It does templating in Smarty, and uses a wiki-esque syntax for markup — though page editing is limited to admin users only (something I was looking for). I decided to try it out, and within an hour or so had a working site ready to upload.
Cgiapp's new site can be found at cgiapp.sourceforge.net.
Shortly after I wrote this original post, I figured out what the strength of Gunther was — and why I no longer needed it. Gunther was basically taking content entered from a form and then inserting that content (after some processing for wiki-like syntax) into a Smarty template. Which meant that I could do the same thing with Cgiapp and Text_Wiki. Within an hour, I wrote an application module in Cgiapp that did just that, and am proud to say that the Cgiapp website is 100% Cgiapp.
1.5.3 fixes an issue introduced by 1.5.2 that creates a performance hit whenever the run mode is being determined by function name or CGI parameter. More details on the Cgiapp download page.
At work, we've been developing a new platform for our website, based entirely on Cgiapp. This week we released the first stage of it: garden.org and assoc.garden.org. These should stand as good testament to Cgiapp's robustness!
With all that development, and also with some communication from other Cgiapp users, I've made some changes to Cgiapp, and release version 1.5.2 this evening.
1.5.2 is mainly security and bugfixes. Error handling was somewhat broken in
1.5.1 — it wouldn't restore the original error handler gracefully. This is now
corrected. Additionally, I've made
run() use the array returned by
consisting of the
$_POST arrays — in determining the run mode.
Finally, I've modified the behaviour of how
run() determines the current run
mode: if the mode parameter is a method or function name, it cannot be a
Cgiapp method or a PHP internal function. This allows more flexibility on
the part of the programmer in determining the mode param — words like 'run' and
'do' can now be used without causing massive problems (using 'run' would cause a
race condition in the past).
As usual, Cgiapp is available in the downloads area. Grab your tarball today!