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https://issues.apache.org/jira/browse/CAY-1902?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14520950#comment-14520950
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Andrus Adamchik edited comment on CAY-1902 at 4/30/15 6:43 AM:
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> Doesn't the cached snapshot HAVE to exist in order for optimistic locking to
> work?
> Is the original snapshot for locking stored somewhere else?
We do optimistic locking at the Obj* level , so no DB snapshot is needed.
> If I remove the snapshot by calling objectStore.unregisterNode then the
> object becomes
> "transient" and has no objectId so I can't evaluate db paths on it.
> So it seems like if the snapshot is not in the cache then you can't evaluate
> db path expressions against it in memory.
Then you need to get the snapshot from DB. BTW, I am rethinking the whole
business of unsetting ObjectId for unregistered objects. I think this is wrong
and we should preserve the id of transient objects that were previously
registered with ObjectContext and then were evicted for one or another reason.
was (Author: andrus):
> Doesn't the cached snapshot HAVE to exist in order for optimistic locking to
> work?
> Is the original snapshot for locking stored somewhere else?
We do optimistic locking on Obj* level, so no DB snapshot is needed.
> If I remove the snapshot by calling objectStore.unregisterNode then the
> object becomes
> "transient" and has no objectId so I can't evaluate db paths on it.
> So it seems like if the snapshot is not in the cache then you can't evaluate
> db path expressions against it in memory.
Then you need to get the snapshot from DB. BTW, I am rethinking the whole
business of unsetting ObjectId for unregistered objects. I think this is wrong
and we should preserve the id of transient objects that were previously
registered with ObjectContext and then were evicted for one or another reason.
> Implement resolving Db paths for DataObjects
> --------------------------------------------
>
> Key: CAY-1902
> URL: https://issues.apache.org/jira/browse/CAY-1902
> Project: Cayenne
> Issue Type: Improvement
> Components: Core Library
> Affects Versions: 4.0.M2
> Reporter: John Huss
> Assignee: John Huss
> Priority: Minor
> Fix For: Undefined future
>
> Attachments:
> 0001-CAY-1902-Implement-resolving-Db-paths-for-DataObject.patch,
> 0001-Implement-db-path-evaluation-in-memory.patch
>
>
> Expressions using db paths don't support in-memory evaluation against
> DataObjects (there is a TODO in the code).
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