Re: Performance cost of conf.addAutoImport

On Tue, Jun 24, 2008 at 2:59 AM, Jeremy Chone <[email protected]> wrote:
> Hi,
>
> I would like to know the performance impact of addAutoImport methods.
> Basically, I would like to have a library of macros available forall my
> templates, but these macros might be used only in very few of them. I might
> have a lot templates (10 to 30) for each request (HTTPRequest).
>
> What is the performance cost of addAutoImport? Should I build logic to try
> to minimize the autoImport?

Nah, almost certainly not.

> I am planning to autoImport only one file with 5
> to 10 macros max.

I haven't really tested this, but I think the performance cost of
auto-importing an infrequently used macro library with 5 to 10 macros
in it is very very (very very :-)) small. Maybe something on the order
of a hashmap.put() or two per macro.

And I don't think there would be very much difference between
autoimporting a single big macro library versus many smaller ones,
though again, I haven't tested it.

Now that I think about it, I actually suspect that within reasonable
parameters, you could think of autoImporting as basically being free.
The one case I could imagine where it would be costly is if your macro
library contains something like:

<#assign myVariable = someVeryCostlyTimeConsumingMethod()>

i.e. calling a java method that is very expensive. Other than that, I
can't see the problem. If the template just contains macros, it's
basically just running over them and putting them in a hashmap, so you
know, the cost is trivial.


JR

>
>
> Jeremy,
>
>
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