Encounter time. I am sitting next to Rich as I write this. Stu
> Ok, I have a 1 and 2 :) > > So is it pessimistic or optimistic? So encounter time ensure or commit > time ensure? > > On Sep 14, 9:36 pm, Stuart Halloway <stuart.hallo...@gmail.com> wrote: >> Actually, the second one is basically it. (Except that I don't know the >> Oracle reference, so can't speak to that.) >> >> Stu >> >>> The first one is correct. >> >>> On Tue, Sep 14, 2010 at 3:22 PM, peter veentjer <alarmnum...@gmail.com> >>> wrote: >>> 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 > > -- > 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 -- 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
