basic patterns for persistence

David P. Harris dpharris at telus.net
Fri Feb 16 01:49:08 UTC 2001


Hi-
As a lurker, and newby, I would be most interested to follow how this project
develops.  It appears to be complicated enough, but simple enought to follow, to
make an excellent tutorial on how to program in Squeak.
David

"Randal L. Schwartz" wrote:

> OK, I have a compelling need to track hours spent on a project for the
> first time in a few years.  I have this old rusty hypercard stack
> (modified to have a 'save as text') that I had formerly used, and I
> think it's about time to hack the same thing in Squeak instead.  So I
> have (ta da) my first Real Project in Squeak(tm).
>
> I think TimeTracker and TimeTrackedItem sound like the two most
> natural classes for this.  So I create TimeTracker as a subclass of
> Morph, I suspect.  Or should it be a subclass of SystemWindow?  And is
> a TimeTrackedItem on the screen as a submorph?  Does it have to be
> within the parent's bounding rectangle?
>
> Or do I even need classes?  Can I just hack a morph adding specific
> behavior/data?  I know... that's the VB approach. :)
>
> Presuming I'm using classes, where does the class code get stored?  Do
> I make a project, build it there, then fileout the project from time
> to time?  And then what about the data?  Should the class itself know
> how to store to a file (and if so, how?), or should I just use "save
> morph on file" to save the data?  And if I "save morph", but then
> alter the class to add additional behavior, will the restored morph
> become one of the new class instances, or somehow stay one of the old
> ones?  And does "save morph" also save all the live submorphs?
>
> I know this is probably all too basic to discuss on this list, but if
> someone would prod me in the right direction, I'm going for it.
>
> --
> Randal L. Schwartz - Stonehenge Consulting Services, Inc. - +1 503 777 0095
> <merlyn at stonehenge.com> <URL:http://www.stonehenge.com/merlyn/>
> Perl/Unix/security consulting, Technical writing, Comedy, etc. etc.
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