I have got a question about the Clojure ensure and how it actually works and the documentation doesn't provide enough information.
I see a few different solutions: 1) An optimistic approach: Once a ref is 'ensured' it is included in the conflict detection set. This means that the approach is still completely optimistic because 2 concurrent transactions that have the same ensured ref, one of them is going to fail when the transaction wants to commit. This is a commit time ensure. 2) The other approach is a more pessimistic approach where a ref can be protected against writes made by other transaction as soon as it is ensured. It still allows reads to happen, but a write/ensure is going to fail. It could be compared to a oracle 'select.. for update'. This is an encounter time ensure. -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
