Persistence & DTSTTCPW: ZODB clone?

Cees de Groot cg at home.cdegroot.com
Fri Feb 1 12:15:53 UTC 2002


 <goran.hultgren at bluefish.se> said:
>Anyway - Stephen Pair has been doing very interesting work in this
>direction and demonstrated parts of it at OOPSLA. One of these things is
>his "CATS" - a transaction service much like the one used in for example
>GemStone. Looked very neat and solid to me.
>
I have played with Cats (or CATS, whatever Stephen wants :-)). I'm planning to
do my ZODB clone (if I do it) in at the very least a CATS-compatible manner.

Note that CATS wants you to subclass transactional objects (IIRC); that's
maybe something you don't want. However, I don't know another way of doing
what CATS does with routing instance variable accesses to the transaction
(except for some transparent proxy magic, which would work but maybe doing
this through DNU is bound to be slow)

>I know he has been thinking about all the other parts too and a small
>bird has whispered in my ear that there might be stuff coming...
>
Could you wisper a bit louder, bird? I'd hate to do double work ;-)

>As another sidenote, I have been playing with ImageSegments a bit and
><plug> if you sign up for an account at SqueakDot </plug> you can
>actually see it in action right there - you can
>checkpoint/revert/analyze your account using ImageSegments and you will
>see some performance numbers right away.
>
The only thing I keep asking myself is whether ImageSegments are good for
fine-grained storage (say a persistent objects and the reference graph to
its non-persistent contained objects, as opposed to a big project). They seem
to be a bit heavy-weighted, don't they?

(OBTW: David Gorisek is contemplating an OmniBase port to Squeak; however,
what's keeping him until now is that he cannot seem to do file locking from
Squeak - anything coming there? Is there a lowest common denominator between
the Squeak platforms for file locking?)

-- 
Cees de Groot               http://www.cdegroot.com     <cg at cdegroot.com>
GnuPG 1024D/E0989E8B 0016 F679 F38D 5946 4ECD  1986 F303 937F E098 9E8B



More information about the Squeak-dev mailing list