I don't have a patch you can easily apply. The workaround on your side is to not let the EO in the parent EC garbage collect (basically, keep a reference to the parent EO around for any EO that you fault into child EC). There's not an easy recovery from this -- you have to toss your EC stack ... or .. maybe you could refetch the snapshot underneath it, but i think you're probably left with a __retainCount of -1 at that point, so probably even that won't help you.
I think this could be fixed pretty easily in wonder by overriding ERXGenericRecord.__setRetainCount .. When count is set >0, call back to your EC and retain the object in a dict and when it drops to 0, release that ref. On Mar 25, 2010, at 4:25 PM, Brook, James wrote: > Mike, > > That sounds all too familiar to me. We are experiencing errors just like > that. We have a feature that creates nested editing contexts several levels > deep and fetches EOs all the way down to the bottom. Do you know of a > workaround, patch or some way to recover from the bug you mention? I seem to > remember a similar bug years ago in the days when EOF kept strong references. > We are using Wonder. > > Sorry for selfishly jumping in. Disappearing snapshots are causing us lots of > pain because whole instances of our application become useless. > > -- > James > ________________________________________ > From: webobjects-dev-bounces+jbrook=upcbroadband....@lists.apple.com > [webobjects-dev-bounces+jbrook=upcbroadband....@lists.apple.com] On Behalf Of > Mike Schrag [msch...@mdimension.com] > Sent: 25 March 2010 20:20 > To: Marc Guenther > Cc: webobjects-dev@lists.apple.com > Subject: Re: Snapshots mysteriously vanishing? > >>> by any chance was this an EO in a parent editing context that also existed >>> in a child editingcontext? >> >> I don't think so, but I'm not sure. That particular EO could have been in >> all differents ECs at the time, as it's entity is used all over the place. >> >> Do you have anything specific in mind? > yeah, there's a bug with refcounting of eo's in child ec's if the parent ec > copy of the EO gets garbage collected ... the result of this bug is > disappearing snapshots. this specifically applies to eo's fetched into a > child that were already fetched into the parent, though, not to peer ec's. > > ms > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/webobjects-dev/jbrook%40upcbroadband.com > > This email sent to jbr...@upcbroadband.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/webobjects-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
