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E-commerce with mod_perl and Apache
rob_99 writes: "Cool new mod_perl article at perl.com documents building a large scale ecommerce solution w/ mod_perl & apache!" Pretty cool stuff - it's kind of funny to think how ephemeral their work turned out to be.
Having built numerous e-commerce sites and even worked on a commercial shopping cart written entirely in Perl, I can't say that I think it's the best choice. It's great if the job is small; it's quick to code, is installed on almost all hosting providers, and so forth. But for large projects the code becomes very difficult to manage, mainly because getting people to write clean Perl code is difficult.
.xs version of the Perl client which wrapped around our C library. This has proven to be much easier to maintain.
There's a second downside: lack of good SSL networking. SSL is critical for credit card processing. I ported the GPL version of TCLink for Perl, and we ran into a lot of problems due to lack of a standard SSL library. For the first version of the client we ended up distributing a patched version of Net::SSLeay which added all of the certificate authentication functions we needed (and are missing from the standard install of Net::SSLeay). Later this became such a headache for the various platforms we were trying to support that we just coded a
Long story short: sure, Perl's great. Is it the best choice for e-commerce? I'm not so sure.
Object Oriented Perl is extremely powerful and flexible. It's possible to do exotic things like multiple dispatch, it *does* support true encapsulation, and you can change inheritance hierarchies at run time. I've seen people write first-class objects and classes (think Self), and I've implemented mixins having seen them in Ruby. You can use all sorts of design patterns, have compile time member checking, and even modify objects as the code is running. There are even good reasons to use multiple inheritance (Perl's not the kind of language that thinks it's smarter than you.)
If you mean "member data tends to be class based instead of object based", then you're right. That's a true limitation of OO Perl. It would also be nice to have a refactoring browser like Smalltalk has.
As for readability, I can't read anything written with Kanji characters. That doesn't mean I'll ever claim it's "unmaintainable compared to English". (To be fair, complex data structure dereferencing *can be* hard to read in Perl.)
how to invest, a novice's guide
If you're problem is even moderately interesting, there will be no out-of-the-box solutions. That Open Source might require more implementation time may be true, but the "turn-key" fantasy is most always a lie.
It seems like the primary ... use for mod_perl is to avoid the overhead associated with loading modules.
Even if you don't use modules (which would be silly, roughly comparable to not using sub-routines), you still incurr the penalty of loading and compiling your scripts each time they run if you don't use mod_perl. Also, mod_perl gives you amazing control over how the requests are interpreted and responded to. But even if it it didn't, a 5 or 6 to 1 improvement in requests/second (which is what I saw just by using mod_perl to run the script, with little of no optimization) is nothing to sneeze at.
"that's not encryption - it's a new perl script that I'm working on..." - from some Matrix parody
Using Perl as opposed to, say, Java or C++, is like using Emacs as opposed to Notepad.
You can learn Notepad lickety split. You'll get alot more done if you know neither and have to get something done in a single day.
But over the long haul, you'd be far better off using Emacs.
Perl (and Python) are the same way: If you turn a bunch of inexperienced coders loose with no oversight and no structure, you'll get crap. But if you have a team of experienced Perl programmers, they will beat the pants off of any team of, say, C++ developers in terms of development time any day of the week.
Not to detract from C++. I am simply saying that the languages are used for different things, and that poor code follows from poor coding standards and practices, inexperience, and unorganized minds.
So if you can't write Perl without seeing spaghetti, I would suggest you have either some learning to do or that you need more discipline in your coding practices.
-- My choice of computing platform is a symbol of my individuality and belief in personal freedom.
Like the subject says, you should be safe in your career. After all, you know The One True Programming Language, right? Perl isn't a toy, though, is it? I mean, if it's functionally equivalent with Ruby or PHP in all respects then it must be worth something, right? (Just don't let those interpreted guys into the Compiled Officer's Club... they might tell wild stories about getting lots of work done really quickly or spread notions about non-compiled languages being the right tool for the job...)
Seriously (or maybe not), perhaps you could check your OO bigotry at Dr. Dobbs door when you come slumming it in Scripting Land? I know some of us started using Perl before a "real" language like C++ or Java, but that doesn't make us unable to learn that real language, does it? Does it mean that we won't be able to get real work done? Are the sites we work on less useful to you?
Why would you look down on someome who has started out with Perl? I started out in the computing world using BASIC on my VIC-20. I didn't have the luxury of Java or C++. Do you think I can still learn? Am I worthy? Can I evolve to your level? Will I ever be able to look down my OO nose at mere scripters like you do? Can I be effete?
Ok, sorry to bait you. I use perl as much as I use shell scripts. I no longer use BASIC or Pascal and I'm glad. Quick and dirty GUI apps in C and C++ are a pipe dream -- Java works very well for that (especially when your app has to very quickly work on everything from BSD to WinNT). But I hate to break it to you: I have no CS eductation. The only CS course I ever took I wound up teaching. Should I resign from my job? Am I doing my company a disservice by "trying" to write OO Java apps for them since I don't have a "real CS education"? Are the OO perl apps I've written even OO enough to get me in the club? Are my C apps more portable than my lack of education? Are my Java apps?
You should realize that your "real" CS education bought you knowledge, but not at the expense of anyone else's abilities. Software Engineering is not a zero-sum game; we can all play without dimishing the accomplishments of others. But if you need to feel important, then I guess your post is like therapy for you or something...
Life is too short to be a snob.
-B
Ash and Hickory, straight-grained and true, make excellent bludgeons, dandy for the cudgeling of vegetarians.
Because just like Apache/Perl or JSP/Servlets, PHP etc. ASP can also be an adequate environment for large-scale solutions if someone with enough experience is using it. If you throw enough brains and money on a problem set, you're bound to get a good answer, no matter which technology is used (unless it has some fundamental deficiencies, of course).
As far as the article is concerned - I doubt that more than the top 1% of experienced Perl programmers could build anything like that...
"I love my job, but I hate talking to people like you" (Freddie Mercury)
If you are just selling products in a plain way, you can get simple enough e-commerce. But if you want to provide good e-commerce that ties in with other content, again there are no out-of-the-box solutions. Also, you have to be happy with a out-of-the-box appearance, where you get to control a few graphics and colors on the page, but the essential layout is fixed. It's usually (but not always) pretty easy to change layout -- but that's still not really out-of-the-box.