On Wed, Aug 12, 2009 at 10:33 AM, Jürgen Herrmann<juergen.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There's: http://www.zope.org/Documentation/Developer/Models/ZODB But it is pretty old and out of date.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 _______________________________________________ For more information about ZODB, see the ZODB Wiki: http://www.zope.org/Wikis/ZODB/ ZODB-Dev mailing list - ZODB-Dev@zope.org http://mail.zope.org/mailman/listinfo/zodb-dev