[Pharo-project] Wishes for new ClassBuilder (toon?)

Stéphane Ducasse stephane.ducasse at inria.fr
Wed May 18 17:01:53 EDT 2011


I'm planning to be at bern the friday 30 of june after tools so I would be happy to do that.

Stef

On May 18, 2011, at 10:31 PM, Toon Verwaest wrote:

> Nope. That needs to be added. Sorry. If you have tests for the old classbuilder we can port them. Otherwise I can take the time at the next print I attend to do it; maybe together with somebody else.
> 
> Toon
> 
> On 05/18/2011 09:38 PM, Stéphane Ducasse wrote:
>> toon I looked at the code but do you have tests for the new class builder?
>> I could not find them.
>> 
>> Stef
>> On May 18, 2011, at 6:17 PM, Toon Verwaest wrote:
>> 
>>> The PlayOut classbuilder indeed separates this nicely. We have the distinction between the "installer" and the "builder". The builder uses an "installer" as a client and notifies it about stuff that happens.
>>> 
>>> For example we have an "anonymous subclass builder" that's implemented like that. It basically just ignores most of the notifications of the builder since it doesn't really do anything.
>>> 
>>> ... but of course this means that you need PlayOut ;) You can get an image at http://pinocchio.unibe.ch/~tverwaes/PlayOut.tar.gz
>>> 
>>> caveats:
>>> - At the moment that system doesn't validate everything yet like the old classbuilder (since I wanted to freely change classes with any name)
>>> - it doesn't handle obsolete subclasses yet. Oh well ;)
>>> - it's still intertwined with our slots implementation, so it relies on Helvetia. But that can/should/will be fixed without changing the API.
>>> 
>>> cheers,
>>> Toon
>>> 
>>> On 05/18/2011 03:18 PM, Mariano Martinez Peck wrote:
>>>> Hi guys. As part of the Fuel project, one of the things we want to do (in fact, it is done) is to serialize classes. There want to have 3 possibilities:
>>>> 1) Do something like DiskProxy where you only save its global name and some selector to run when deserialing it
>>>> 2) Really searialize the whole class (following method dictionary, compiled methods, class pools and friend, etc) so that you can deserialize it in another image where such class is not present.
>>>> 3) Do the same as 2 but validating and installing the class in the system.
>>>> 
>>>> For 2) what we want to do is just to serialize the class as any other object. As a result, we get a Class instance. Nothing is validated, nothing is added in Smalltalk globals, nothing is compiled. We do not use ClassBuilder at all.
>>>> 
>>>> For 3) we want to do 2) plus validating and installing the class in the system. For validating I mean ALL the validations that the class builder does when creating or modifying a class. And for "installing in the system" I mean notify, put in Smalltalk globals, re compile what is needed, etc...
>>>> 
>>>> ClassBuilder seems to do 2) and 3) together. So, what I would love to have in a new class builder is to have those two things separated. So that I can say to an object ClassManager validate: aClass or ClassManager installClassOnSystem: aClass.
>>>> 
>>>> Do you think such thing is possible?  Right now going through ClassBuilder and understand all the validations it does is really complicated :(
>>>> 
>>>> Thanks in advance,
>>>> 
>>>> -- 
>>>> Mariano
>>>> http://marianopeck.wordpress.com
>>>> 
>>> 
>> 
> 
> 





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