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From Adrian Tarau <>
Subject Re: Velocity Question
Date Tue, 18 Mar 2008 20:27:42 GMT
Hello Gautam,

I had the same problem, rendering an UI model as HTML(plain HTML or 
My solution is to have a directive called #function(name param1 param2 
...) and the function is actually an abstractization,* *you can have a 
function implemented in Java or can be another template(even a different 
engine). The function implementation can specify if the context changes 
propagates or are local to the function(by default are local and this 
should be the way to go) . I can mix different template engines, for 
example I can call a FreeMarker template from my Velocity template ;)

I didn't had time to do some performance testing, but I don't think 
there will be performance penalties and the memory consumption will be 
the same as loading all 50 templates in memory.

I can send you the link to the source code if you want to have a look.

Gautam Joshi (jgautam) wrote:
> Hi,
> I am planning to use Velocity for a metadata driven UI framework.
> A velocity template at will be fed the UI metadata from the database.
> Based on this metadata,
> this template will then invoke other velocity templates. I plan to have
> templates defined for Text fields, Select Boxes, etc. 
> Based on the type and number of fields defined in the metadata, the
> topmost velocity template in turn will call these other templates that
> handle specific field types.
> I do not expect the metadata to have more than 50 fields. 
> Do you think this approach will cause any memory or performance issues?
> I would really appreciate if someone could share their thoughts and
> prior experiences.
> Thanks
> -Gautam

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