[ZODB-Dev] Historical revisions in ZODB

[hazmat]

how would this differ from the application level zope version control
http://cvs.zope.org/Products/ZopeVersionControl
?

-haz

Chris Withers wrote:

> Dieter Maurer wrote:
>
>> I will implement "edition"s for HCFileStorage.
>>
>>   The base concept it an object "HistoryReference" that
>>   references an object (identified by an "oid") at a given
>>   time (identified by "serial"). Packing will not release
>>   records when they are directly or indirectly referenced
>>   by a "HistoryReference".
>>   This will make packing more expensive. I expect a 50 % increase
>>   in time and memory.
>>
>>   An edition is a collection of "HistoryReferences", effectively
>>   freezing the state of objects referenced from the edition
>>   at a given time. The "HistoryReference" mechanism protects
>>   this state against packing.
>
>
> It would be very cool to see this in the default FileStorage 
> implementation...
>
> cheers,
>
> Chris
>
>
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