Aaron: Yep, I'm aware - and am using the value provided by the last parameter.
This is going to be tough to show the problem without bringing more details of my concurrency set up. I'm not sure if this will exhibit the problem, but this is what it boils down to: https://gist.github.com/MichaelDrogalis/6122834 When enough threads are trying to write to the queue, the watches triggered later can finish before watches triggered earlier. On Wednesday, July 31, 2013 11:05:16 AM UTC-4, Aaron Cohen wrote: > > A watcher fn has 4 parameters: key, reference, old-state, new-state > > If you use old-state and new-state rather than the reference, you should > not see your problem. > > --Aaron > > > On Wed, Jul 31, 2013 at 11:00 AM, Michael Drogalis > <madru...@gmail.com<javascript:> > > wrote: > >> Problem: >> >> I have a ref representing a queue of people in line. >> I add a watch to the ref to print out the contents of the queue whenever >> it changes. >> Naturally, and expected, the following can happen if queuing happens in >> rapid succession: >> >> Queue: [] >> <add "Mike" to queue> >> <add "John" to queue> >> >> console: "Queue is Mike, John" >> console: "Queue is Mike" >> >> I'd like to write a UI for this program, but I clearly can't reliably >> render based on the result delivered >> by the add-watch hook. What's the solution for this problem? >> >> -- >> -- >> You received this message because you are subscribed to the Google >> Groups "Clojure" group. >> To post to this group, send email to clo...@googlegroups.com<javascript:> >> Note that posts from new members are moderated - please be patient with >> your first post. >> To unsubscribe from this group, send email to >> clojure+u...@googlegroups.com <javascript:> >> 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 unsubscribe from this group and stop receiving emails from it, send an >> email to clojure+u...@googlegroups.com <javascript:>. >> For more options, visit https://groups.google.com/groups/opt_out. >> >> >> > > -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
