On Wed, Aug 12, 2009 at 10:33 AM, Jürgen
Herrmannjuergen.herrm...@xlhost.de wrote:
hi there!
is there a zodb design document?
There's: http://www.zope.org/Documentation/Developer/Models/ZODB
But it is pretty old and out of date.
what i'm interested in are the following things:
- some basic description how the zodb works (f.ex. i don't understand
what the difference between a serial and a transaction id is)?
There is no difference. I thought there could be when I originally
designed ZODB, but it turns out to be good enough to use the tid as
the serial.
- looking at basestorage and the methods that have to be implemented,
is there documentation what the reimplementation in a concrete
subclass has to do exactly? (ordering of things, desired side effects
etc.)?
You should look at the storage interfaces in ZODB.interfaces and in
ZEO.interfaces. You should have a firm understanding of how
transactions work in general. Our transaction system is based on
time-stamps.
You should also ask questions here.
why do i ask? i'd like to create a RadosStorage zodb backend ceph's
underlying object storage RADOS (see
http://ceph.newdream.net/blog/category/rados/ )
That's interesting. You might want to look at DirectoryStorage,
http://dirstorage.sourceforge.net/, which implements the storage APIs
(at least as they existed a few years ago) on top if a file system.
Jim
--
Jim Fulton
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