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| <a name="Case Study: XMLC vs. Velocity"><strong>Case Study: XMLC vs. Velocity</strong></a> |
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| <blockquote> |
| <p> |
| A while ago, a question was asked on a Jakarta Tomcat mailing list about |
| XMLC and Velocity. Bojan Smojver gave this thoughtful |
| reply, and gave us permission to present it here on the Velocity site. |
| </p> |
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| <td bgcolor="#ffffff"><pre> |
| |
| I found this in the tutorial for XMLC: |
| |
| ------------------ |
| XMLC is a Java-based compiler that takes a document written in the |
| Hypertext Markup Language (HTML) or the eXtensible Markup Language (XML) |
| and creates Java classes that will faithfully recreate the document. The |
| resulting Java classes can be used to insert dynamic content into the |
| document framework at run time. XMLC, therefore, is a wonderful way to |
| create dynamic HTML or XML documents from Java. |
| ------------------ |
| |
| This sounds awfully like JSP to me, which is reason #1 why someone would |
| use Velocity. |
| |
| Although I use Velocity for my web work, Velocity is a generic template |
| engine, it doesn't really care about the rest of the content. And that's |
| great! |
| |
| I use XSLT (sorry Jon, promise to give Anakia another look :-) to |
| prepare my documents from XML into XHTML (this is not done at run time, |
| not like Cocoon) and Velocity doesn't get upset much by that (except for |
| the fact that you can't have '&&' (VTL and) in XSLT without applying a |
| few tricks) but I've overcome that through Ant's nice replacement |
| techniques... |
| |
| Anyway, the first bad point to XMLC goes for the pains of code |
| generation, which Velocity avoids so neatly. |
| |
| The second is the actual process of designing the complete solution |
| which is pictured here: |
| http://xmlc.enhydra.org/project/aboutProject/index.html |
| |
| Designer designs the page and then engineer puts in the logic? This |
| sounds very bad to me. There should be a 'box full of Lego's' designers |
| can choose their functionality from, not the other way around. If |
| engineers have to be involved in simple projects, it comes back to |
| employing engineers to do everything in the first place. And why |
| wouldn't you use even JSP or ECS in such a case? You're are mucking |
| around with Java again... The XMLC cycle is just too long and it doesn't |
| make sense at all - what happens when a designer (by mistake or |
| intentionally) screws up the id's in the page? All of the engineers code |
| becomes unusable. Now that's a nice separation between presentation and |
| functionality! |
| |
| Second bad point. |
| |
| An example from my 'production line', which illustrates how Velocity |
| handles the above. I have a few classes that handle all inquiry forms: |
| one class handles the fields from the form and stores those into a |
| database, the other one picks the fields and mails them to designated |
| e-mail address. These classes are beans and are loaded from the only |
| servlet I ever use (licensed GPL, but could contain any number of bugs |
| since I wrote it), which handles ALL Velocity pages: 331 lines long |
| including comments. Beans have scope and all, just like with JSP's. |
| |
| Once the first ever form is created and debugged, an imaginary web |
| designer on my 'production line' would copy and existing Velocity page |
| from a previous project, change the fields (their names, their number... |
| whatever) in it and the other content. Once they post the page on the |
| site, that's it. It just works. They didn't even have to talk to an |
| engineer to get things done. Now that's MUCH better then XMLC! |
| |
| I think the biggest problem XMLC, JSP and servlets are facing is more of |
| a philosophical nature: the document is data, not code - and Velocity |
| treats it exactly like that. Why would you convert your HTML into a Java |
| class when you want to send it to the browser as text? |
| |
| My 2 cents. Velocity rocks! |
| |
| Bojan |
| |
| </pre></td> |
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| </blockquote> |
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