Magma Tutorial / Code examples

[Chris Muller]

Hi Milan, there is a sample "to do" application on SqueakSource:

  http://www.squeaksource.com/@XTOivtXt6GCltqN7/X5iRrmAt

.. and then an additional project you can "Merge" to see what code
changes to do for Magma.

  http://www.squeaksource.com/@XTOivtXt6GCltqN7/zRQqDDnA

This is an accompaniment to a chapter in Stephane Ducasse's new book
about persistence frameworks for Squeak.  I have a draft of the Magma
chapter, but I'll bet his has been updated.  Stef?

I do plan to write some updated documentation as part of the next (42,
not 41) Magma release, which will be done this year.

 - Chris


On Thu, Oct 9, 2008 at 5:32 PM, Milan Zimmermann
<milan.zimmermann at sympatico.ca> wrote:
> On 2008 October 9, Göran Krampe wrote:
>> Hi!
>>
>> Brent Pinkney wrote:
>> > Hi Milan,
>> >
>> > Ther will be a lot of documentation forthcoming on Magma soon(-ish).
>>
>> Cool! :)
>
> Sounds exciting - pushing my luck - do you have a rough information as to
> when, and/or would there be a pre-alpha version of the docs available?
>
>>
>> > I would suggest the Lava test cases as a decent place to start.
>> >
>> > I would also ping this list for help.
>> >
>> > Brent
>>
>> As noted Gjallar uses Magma but definitely not in the "easiest manner". :)
>>
>> Since Gjallar uses "reified transactions" in the form of a class
>> hierarchy with one subclass for each "kind" of database change - and
>> then instantiates such a class, feeds it with the proper data, and then
>> tell it to "execute" on the model, finally putting it away for
>> historical reasons in an ever growing MagmaCollection - it definitely
>> makes it hard to "find" the use of Magma in Gjallar.
>
> ok
>
>>
>> It is really not a good example of how to use an OODB/Magma in the
>> "vanilla" case.
>>
>> Having said that Gjallar is still an interesting example since we use
>> both strategies, indexing and quite a complex object model - all working
>> quite smoothly.
>
> ok
>
>>
>> For example, we have a customer running a Gjallar instance since january
>> without any issues - the VM has not even been restarted since then.
>
> that is cool. If I have it my way, and with a bit of luck, this will be an app
> that need about 100K - 1mil and up objects stored (@ up to 1K per object)
> with potentially up to 100K of them processed in a transaction (only a few
> fields updated though) - not sure I won't be pushing some Squeak limits. At
> this  point, a Magma learning and familiarization exercise for me...
>
> Thanks, Milan
>
>>
>> regards, Göran
>>
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