Magma for Squeak Persistency

[Lukas Renggli]

Of course it would be great to have Magma provide additional safety;
the possibility to easily move between images; the possibility to
roll-back; and maybe even serve the same model from different images;
...

Lukas

On 4 December 2010 19:10, Chris Muller <asqueaker at gmail.com> wrote:
> Well, that project didn't "fail," I just had to move on to other work
> and have not had a chance to return to it.
>
> Traversing the entire object model a lot would certainly require it to
> be fully materialized into memory, so Magma (or any persistence
> framework) wouldn't really allow Pier models to effectively move
> beyond the size of available RAM.
>
> But the use of Magma could be beneficial in terms of safety; much
> safer than "image persistence" since every commit is verified with
> SHA1, and you can replicate and roll-back the model if necessary, etc.
>
>
> On Sat, Dec 4, 2010 at 2:49 PM, Lukas Renggli <renggli at gmail.com> wrote:
>>> I had not heard about any attempts to do this.  Do you know why they
>>> were not successful?
>>
>> You wrote to me in Dezember 2009:
>>
>> "I will obviously be interested in persisting my Pier sites in Magma.
>> I have examined the Pier model and grok'd the code related to
>> persistency, and from this have coded a new Persistency subclass,
>> PRMagmaPersistency (14 methods)."
>>
>> I said: "Another thing I should warn you about is that Pier scans its
>> complete object graph whenever a page is edited, moved, copied,
>> removed, etc. The same happens when a live search is performed or when
>> a page is displayed with all its references enumerated. This basically
>> made my initial attempt of a persistency strategy using GOODS back in
>> 2003 impossible. I don't know, but I guess this might be a problem for
>> Magma too, when the complete object graph is traversed several times
>> for every request?"
>>
>> After a few more mails back and forth I haven't heard anything
>> anymore, so I assumed the project failed.
>>
>> There are is a Pier-Magma package in
>> <http://source.lukas-renggli.ch/pieraddons> (and a few others that
>> mention Magma in some commits). I am not sure if they are used and
>> working.
>>
>> Lukas
>>
>> --
>> Lukas Renggli
>> www.lukas-renggli.ch
>>
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>
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-- 
Lukas Renggli
www.lukas-renggli.ch