RE: [GS/SS Beta] SystemChangeNotifier & MADescriptionBuilder

Thanks Lukas So for magritte GemStone port, I will let the MADescriptionBuilder build and cache the description for objects if it doesnt already exist in the cache and since code chages will be very rare in a production enviorment, i leave out MABuilderDescription subscription to SystemChangeNotifer for method chages in the System Cheers ISaiah> Date: Wed, 10 Oct 2007 13:34:20 +0200> From: renggli(a)gmail.com> To: smallwiki(a)iam.unibe.ch; beta(a)seaside.gemstone.com> Subject: Re: [GS/SS Beta] SystemChangeNotifier & MADescriptionBuilder> > > To build a metadescription of an object Magritte per default only> > looks a the class side. It collects all the selectors the class of the> > object contains that begin with 'description' and performs them. This> > can take a moment on Squeak so a cache was added that maps classes to> > metadescriptions. This cache will have to be invalidated if a class is> > changed (a method added or removed).> > The cache is only useful if you need to traverse a collection of> thousands of objects that mostly share the same descriptions. Like> this, descriptions don't need to be recreated all the time. This> significantly speeds up the traversal.> > > PS: looking at the squeak implementation it seems that MADescriptionBuilder> > flushes its cache of description if any method is changed or modified or> > added in the entire System, not necessrily an object in the> > MADescriptionBuilder cache> > This is the simplest thing that reliably works. It could be that you> call other methods from the code that builds the descriptions (for> example, if you extract default values to separate methods), that> could affect the settings of the descriptions. In a productive system> the cache fills up pretty fast. Since code changes in a productive> system are rare this is not an issue.> > Lukas> > -- > Lukas Renggli> http://www.lukas-renggli.ch> > _______________________________________________> SmallWiki, Magritte, Pier and Related Tools ...> https://www.iam.unibe.ch/mailman/listinfo/smallwiki _________________________________________________________________ Your Future Starts Here. Dream it? Then be it! Find it at www.seek.com.au http://a.ninemsn.com.au/b.aspx?URL=http%3A%2F%2Fninemsn%2Eseek%2Ecom%2Eau%2…