[squeak-dev] Extracing author information from Utilities

Chris Muller asqueaker at gmail.com
Fri Sep 14 20:34:32 UTC 2012

Hi guys!  Levente, thanks for pushing this forward!

> My feeling is that "Author current" should be the only place where we
> lazily initialize by asking the user. Then Author>>initials would just
> be a normal accessor, and Author class>>initials would go through
> #current. The tricky bit with that idea is that we'd need a slightly
> more elaborate UI, so let the user fill in both initials and username.
> One idea would be to get rid of #username for now, and have Author
> objects with just initials. Then in 4.5 we we'd flesh things out a bit
> more.

> The way these methods behave is similar to how Utilities works. The *PerSe
> methods are just simple accessors and the accessor looking methods ensure
> that they are initialized.
> What about removing the *PerSe methods from the instance side and update
> boths sides so that only the class side accessor looking methods request the
> initialization of the data? E.g.:
> Author initials. "this will request the initials if they are not set"
> Author current initials. "just returns the initials"
> Author initialsPerSe. "just returns the initials"
> Author current intialsPerSe "MNU"
> This would make the behavior of the instance and the class side different,
> which might be surprising.
> Another idea is to not try to make the new implementation resemble the old
> one, just ensure the compatibility via the methods in Utilities.

Say, would y'all mind if we think of Author as a *pure domain object*
and NOT couple any Squeak-specific UI behaviors to it whatsoever?  We
all know doing that is bad practice so how about letting Utilities
take responsibility for ensuring a there is a well-formed "current

That frees Author to just "be" a simple and regular kind object of
which there can be multiple instances.  Its just that the "current"
one is the one which the rest of the system recognizes as the one
authoring (saving code, etc).

Real people's names don't usually change, so let's not treat "Author
current" like a global variable and temporarily maul someone's name
just to accomodate some test process.  Besides, then we'd have to
worry about Mutexes and multi-process updating, etc..

I submitted an update to the inbox that takes this tact.  With this,
applications that are ok to be integrated with Squeak UI elements can

   Utilities authorInitials

and it will make sure the Author current initials is set.  Meanwhile,
applications that just want to access the current value and possibly
set it in their own way can simply check

  Author current initials

and take action in their own way if they want.

What do you think?

More information about the Squeak-dev mailing list