[ome-devel] findObject problem

[Ilya Goldberg]

On Dec 7, 2006, at 1:29 PM, Jeremy Muhlich wrote:

> On Thu, 2006-12-07 at 18:43 +0100, august wrote:
>>> Hi August
>>> Wrapping in an eval isn't really over-kill (brace eval, not  
>>> string) -
>>> its the recommended way to catch exceptions.
>
>> oh, ok.  I'm no perl expert....just learning it as I go with OME.
>> Somehow, I remember being told that  the brace eval actualy starts
>> another perl interpreter, which seems to me like it would be  
>> something
>> to avoid.
>
> Brace eval is functionally equivalent to try/catch in Java or C++.
> Don't fear it at all if you are just wrapping some code to catch
> exceptions, there's no performance penalty.
>
> String eval on the other hand IS quite slow, as perl has to recompile
> that code string every time through.  It doesn't start another
> interpreter per se, but it's slow.  There are certain times when you
> need this, but exception handling isn't one of them.

OME uses string eval internally to generate classes from ST  
definitions at run-time.  That's why there's no code for all these ST  
classes - they're all made on the fly when you want them.  The  
ability to write self-modifying code is actually the primary (only?)  
reason OME was implemented in Perl rather than Java.  Just be glad we  
didn't go with Lisp.  This was MIT after all.
;)
-I



>
>
>  -- Jeremy
>
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