[jboss-dev-forums] [Design of JBossCache] - Re: Node removal not working with Invalidation?

[manik.surtani@jboss.com]

"bstansberry at jboss.com" wrote : 
  | I was trying to think how this could break things; e.g. app removes some data and then tries to recreate it. Say an admin creates a "user" account entity; realizes he's mucked it up, deletes it and starts over with the same id. He could get version conflicts when he starts over.
  | 

Well, not necessarily.  Version != identity.  He would be allowed to add it again, the version would increment without a problem.  Where it *does* step in is if 2 admins attempt to create the same id, but that is a valid conflict anyway.

"bstansberry at jboss.com" wrote : 
  | 3) If explicit data versioning is used, it could be a problem. But perhaps that can be handled in the Hibernate/JBC integration, which separately handles cache insertions of newly created entities.

Again, it shouldn't be a problem if used correctly.  Explicit versioning should only be used if there is an external "true representation of state" (such as a database) which also maintains versioning for that state.  Explicit versioning is only meant to be a way to expose the versioning maintained by the database.


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