SmalltalkImage current

stephane ducasse stephane.ducasse at free.fr
Wed Jul 4 06:43:54 UTC 2007


Hi craig

what would be a migration strategy and how can we in a piecemeal way
(possibly) cherrypick your enhancements?

Stef


>
> Hi--
>
>> what to do with global variables, which is identified by name?
>
>      From the Spoon mailing list message I just mentioned[1]:
>
> ***
>
>      I addressed the associations [in the SystemDictionary instance]
> that refer to classes, but there are others. These are the other
> so-called "global" variables (like Display, the primary display) as  
> well
> as all the "shared pools" (like TextConstants and, strictly speaking,
> Undeclared). I think each currently-global variable should be the
> responsibility of some class. So the primary display could be  
> something
> you get by sending "primary" to DisplayScreen.
>
>      Shared pools are dictionaries of shared-variable associations,
> similar to the system dictionary (in fact, I'd call the system
> dictionary just another shared pool). I know some think we should  
> simply
> banish all shared pools, but I'll assume for the moment that we're
> keeping them. I find them useful, I just think some class should take
> responsibility for each one. I've added a "publishedPools" instance
> variable to Class, which stores all the shared pool dictionaries for
> which a class has responsibility (i.e., the class that introduced the
> pool into the system). I renamed the traditional "sharedPools"  
> instance
> variable in Class to "receivedPools"; these are the pools that a class
> merely uses. Finally, I renamed the "classPool" instance variable to
> "classVariablesPool", just to be clearer.
>
>      When you want to use a shared pool, you access the pool by  
> sending
> a message to the responsible class, rather than relying on its name
> being a "global variable".
>
> ***
>
>      And to that I'll just add that each responsible class can provide
> access to individual published variables by direct message when  
> appropriate.
>
>
>      thanks again,
>
> -C
>
> [1] http://tinyurl.com/yn7f9h (lists.squeakfoundation.org)
>
> --
> Craig Latta
> improvisational musical informaticist
> www.netjam.org
> Smalltalkers do: [:it | All with: Class, (And love: it)]
>
>
>




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