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[Q] Safe way of removing class from system

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Chun, Sungjin

[Q] Safe way of removing class from system

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Hi,

Is there safe way of removing class from system without making
ObsoleteClass? What I found is check whether there're instances of the
class and remove all methods, instance variables and class variables,
and make its superclass as Object, then remove the class and if there's
ObsoleteClass, then I use becomeForward: like this: anObsoleteClass
becomeForward: Object.

I'm not sure my way of removing is correct thing.

Thanks in advance.
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tblanchard

Re: [Q] Safe way of removing class from system

I start by browsing class refs and making sure no code refers to the
class by name.
Once you've done that, see if you can find out if anything is caching
instances and get them released.
Then just choose 'remove class'

On Nov 5, 2006, at 5:38 PM, Sungjin Chun wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Hi,
>
> Is there safe way of removing class from system without making
> ObsoleteClass? What I found is check whether there're instances of the
> class and remove all methods, instance variables and class variables,
> and make its superclass as Object, then remove the class and if
> there's
> ObsoleteClass, then I use becomeForward: like this: anObsoleteClass
> becomeForward: Object.
>
> I'm not sure my way of removing is correct thing.
>
> Thanks in advance.
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> Version: GnuPG v1.4.2.2 (GNU/Linux)
> Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org
>
> iD8DBQFFTpInQqspS1+XJHgRAkQuAKCmF8MPtS6BQh2atFqdBP0wz0qAegCgrdYr
> u7IwxAul05pgY/v/38y2kC4=
> =aii4
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>

Ramon Leon-4

Re: [Q] Safe way of removing class from system

>>
>> Is there safe way of removing class from system without making
>> ObsoleteClass? What I found is check whether there're instances of the
>> class and remove all methods, instance variables and class variables,
>> and make its superclass as Object, then remove the class and if there's
>> ObsoleteClass, then I use becomeForward: like this: anObsoleteClass
>> becomeForward: Object.
>>
>> I'm not sure my way of removing is correct thing.
>>
>> Thanks in advance.

You can also just find, and eliminate all remaining references

SomeClass allInstances do: [:each | PointerFinder on: each].

or if you have obsolete classes hanging around, look them up as well

Smalltalk obsoleteClasses do: [:each | PointerFinder on: each].

Once you rid yourself of those hanging references, just do a
garbageCollect and you should be good to go. I'd be careful with
become, you shouldn't need it.

Ramon Leon
http://onsmalltalk.com