Hi igor

I cannot help but indeed we need a real brand new classbuilder
with a nice MOP for instance migrating too. We will start to work on that probably december/january.

Stef
On Sep 23, 2010, at 12:03 AM, Igor Stasenko wrote:

> Hello, guys
> 
> i want to do a simple thing, which can be expressed by following:
> 
> oldClass replaceWith: newClass migrateInstances: [:inst |
>  ... ]
> 
> In my case, first, i installing a WeakFinalizationRegistry class,
> and then want to replace an old WeakRegistry class with it,
> silently and painlessly.
> 
> I end up with following script:
> 
> | old new oldClass newClass |
> 	old := OrderedCollection new.
> 	new := OrderedCollection new.
> 	
> 
> "migrate instances"
> WeakRegistry allInstancesDo: [:registry | | newr |
> 		old add: registry.
> 		newr := WeakFinalizationRegistry basicNew initialize.
> 		registry migrateTo: newr.
> 		new add: newr ].
> 	old asArray elementsForwardIdentityTo: new asArray.
> 		
> "replace the class"
> 
> 	oldClass := WeakRegistry.
> 	newClass := WeakFinalizationRegistry.
> 		
> 	Smalltalk forgetClass: #WeakFinalizationRegistry logged: false.
> 	newClass superclass removeSubclass: newClass.
> 	newClass setName: #WeakRegistry.
> 	oldClass becomeForward: newClass.
> 
> --
> 
> it looks a bit hackish, and i wonder how to do that in more 'standard' way.
> 
> Initially replacing classes was:
> 
>  oldClass removeFromSystem.
>  newClass rename: #WeakRegistry
> 
> the problem with that, is that all compiled methods , which was
> referring to old class through association,
> still using it, and to get rid of them i have to recompile them.
> 
> 
> 
> -- 
> Best regards,
> Igor Stasenko AKA sig.
> 
> _______________________________________________
> Pharo-project mailing list
> Pharo-project at lists.gforge.inria.fr
> http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project