Christopher Williams wrote:

> I think the part we need to clean up is the build process. We grab the
> source and parse it a number of times there. Instead we should do it once
> and pass along the contents, root AST node and pointer to the IFile to
> each
> build participant.
Yep;

> I've never cached the root AST underneath a RubyScript because I was
> unsure
> how much memory overhead it'd take up to hold onto that in memory, and
Well... it shouldn't take up much.
Ruby files tend to be quite small (I have yet to see a Ruby file that
even approaches 100 KB), so that shouldn't be a problem, unless you
really, _really_ need to have every single file in Rails, Rubinius, the
Ruby standard lib, etc. open simultaneously.

The overhead/space requiremens of the JRuby AST depend strongly on the
source;  100 KB file consisting mostly of long comments or Strings won't
take much more than the source itself, whereas a huge file consisting
mostly of code like "a = [1,2,3,.............., 100000]" will take a
huge amount of space, etc.
The usual case will be somewhere in between that, though it'll be closer
to the former.

So: I guess post-0.9 RDT could have an AST updated regularly on the
reconciler Job - although I'd have to check parsing speeds for JRuby;
Alternatively it could be updated on demand.

murphee

PS Note to self: pressing "Send" is compulsory to get a mail to hop onto the 
interweb... just found this mail in my Drafts folder;
-- 

Blog @ http://jroller.com/page/murphee 
Maintainer of EclipseShell @ http://eclipse-shell.sourceforge.net/



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