[GemStone-Smalltalk] migrating to SmallDate and SmallDateAndTime

[Richard Sargent]

On Thu, Sep 1, 2022 at 5:38 PM Wai Lun Mang <mang at acm.org> wrote:

> A way to do this is to find all the instances of Date using the
> allInstances method and iterated it.  Create the corresponding SmallDateAndTime
> and use become: to swap the pointers.
>

I don't think you can use #become: with specials. They don't live in the
object table.


>   Once you have all the instances (store them in some global), you can use
> multi gem sessions to perform the migration assuming you have a lot of
> them.
>
> One thing to be careful is that gemstone system objects might have Date
> instances, it is safe to migrate them?
>

It should be. Once the special representation was introduced, GemStone
builds would have started using them. So, an older system upgraded to 3.6.x
should be able to convert the Dates, etc. to specials and replace them.


>
> On Thursday, September 1, 2022 at 09:51:46 AM PDT, Richard Sargent via
> GemStone-Smalltalk <gemstone-smalltalk at lists.gemtalksystems.com> wrote:
>
>
> Sorry, Otto. #copy will NOT do it. I misread my results.
>
> I suggest you create an e.g. #normalized method on the various original
> classes and on their Small* subclasses and on Object. Object and the Small*
> classes would answer self. The implementation on DateAndTime, etc.would use
> the instance creation API to create a new instance (which would turn out to
> be the special OOP encoded object). Replace the instance if #normalized
> gives you a different object, leave it alone if it answers the original
> object.
>
>
>
> On Thu, Sep 1, 2022 at 9:32 AM Otto Behrens <otto at finworks.biz> wrote:
>
> Ha! Thanks a lot Richard
>
> On Thu, 01 Sep 2022, 18:23 Richard Sargent, <
> richard.sargent at gemtalksystems.com> wrote:
>
> On Thu, Sep 1, 2022 at 5:18 AM Otto Behrens via GemStone-Smalltalk <
> gemstone-smalltalk at lists.gemtalksystems.com> wrote:
>
> Hi,
>
> We are upgrading to GS 3.6.x and would like to convert our Date objects to
> SmallDate and DateAndTime objects to SmallDateAndTime. What would be an
> efficient way to do this? I reckon I will have to hunt for the most
> commonly used places where they are used and then just convert.
>
>
> Repository>>allReferencesToInstancesOfClasses: can be used to find the
> referencing objects.
>
>
> What would be the best methods to use to create a new SmallDate from a
> Date and a SmallDateAndTime from a DateAndTime?
>
>
> Sending #copy to the old DateAndTime should answer a SmallDateAndTime.
>
>
> Thanks
>
> Otto Behrens
>
> +27 82 809 2375
> [image: FINWorks]
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>
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