Hi Ivan et al, I have managed to re-read the string every 15 seconds, the problem is that the slurp reads stale data. It returns always the same string, even though I can see in my browser that it has changed. This also happens when I just do the slurp in the REPL. Apologies for not making this clearer in the original post.
Thomas On Jun 10, 9:03 am, Ivan Koblik <[email protected]> wrote: > Hi Thomas, > > You need to execute this line: > (dosync (ref-set location (read-json (slurp url)))) > every time you want to re-query the string. > > To do this periodically you could do something like this [1]: > > (import '(java.util TimerTask Timer)) > (let [task (proxy [TimerTask] [] > (run [] (dosync (ref-set location (read-json (slurp url))))))] > (. (new Timer) (schedule task (long 15000)))) > > [1]:http://www.mail-archive.com/[email protected]/msg00136.html > > Cheers, > Ivan. > > On 6 June 2011 14:51, Thomas <[email protected]> wrote: > > > > > > > > > Hi All, > > > I recently started playing with Clojure and loving it... and finding > > of course the usual problem(s). In my little program I am reading a > > JSON string that changes regularly, up to once every 15 seconds or so, > > through HTTP. I know that the string changes, I can see that in my > > browser and I can see things change in another (web)app that consumes > > the string. My current code looks like this: > > > (def url "http://xxxx.xxxxx.xx"; ) > > (def location (ref nil)) > > (dosync (ref-set location (read-json (slurp url)))) > > > My problem is, that once I have started the program it reads the > > string successfully, but subsequent reads are the same, even though I > > know that the string has changed. What should I do differently? (I > > loop through the function with a bit of code from Rich Hickeys > > ants.clj) > > > TIA > > Thomas > > > -- > > You received this message because you are subscribed to the Google > > Groups "Clojure" group. > > To post to this group, send email to [email protected] > > Note that posts from new members are moderated - please be patient with > > your first post. > > To unsubscribe from this group, send email to > > [email protected] > > 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 [email protected] Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/clojure?hl=en
