[Zope] Python and EJB (J2EE)

[Ender]

assuming no errors, in which case you'll get rollback method calls, or
subtransactions.

a call to tpc_begin signals the begin of the two-phase commit. than
comes a call to commit, next tpc_vote, and finally tpc_finish.

kapil


Ender wrote:
> 
> Nitin Borwankar wrote:
> >
> >
> > > I've mentioned two-phase commit to Digicool people. Not sure whether it's
> > > already inside Zope or not, but it seems not. Zope's TM (Transaction
> > > Machinery) does not seem to be two-phase. See the TM.py file itself: it only
> > > has
> > >
> > >     def _finish(self):
> > >         self.db.commit()
> > >
> > > That is, I don't see the equivalent of prepare_to_commit().
> >
> > I'm not sure Zope source is the place to look for this,
> > perhaps ZEO source may be more appropriate.
> >
> > Nitin.
> 
> this has been enlightening, i'm still coming up to speed on all the ejb
> stuff.
> 
> zope does implement a two-phase commit and it is integrated with the
> transaction machinery. to see a good mix in that shows more of the
> transaction methods take a look at ZPatterns/Transaction.py although its
> not recommended for use (its deprecated in the current ZPatterns to look
> at you'll have to check out an older version).
> 
> you can see how things get called by looking in
> 
> ZopeHOME/lib/python/ZODB/Transaction.py to see the internals of a
> transaction mechanics.
> 
> and you can see how the zodb manages these semantics for objects living
> in the ZODB here.
> 
> zHOME/lib/python/ZODB/Connection.py
> 
> kapil
> 
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