Perhaps you could do the db update as an agent action and then the ref update within the agent action if it is successful - see http://groups.google.co.za/group/clojure/browse_thread/thread/d645d77a8b51f01/667e833c1ea381d7
Regards, Adrian. On Fri, Apr 3, 2009 at 11:02 AM, Brian Carper <briancar...@gmail.com> wrote: > > Is there a safe way to keep the data in a Clojure ref and the data in > a table in an external (e.g. mysql) database in sync, given concurrent > creates/updates/deletes from within Clojure? > > I can't do a DB update from within a dosync because of retries. If I > send-off an agent for the DB update from within a dosync, it won't > happen until after the dosync is done, and then if the DB update > throws an exception, it'll be too late to rollback the ref and they'll > be out of sync. If I do the DB update and ref update separately, > there's the potential for race conditions if things happen in between. > > Is manual locking the only way? > > > --~--~---------~--~----~------------~-------~--~----~ 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 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 -~----------~----~----~----~------~----~------~--~---
