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/clojure@googlegroups.com/msg00136.html
Cheers,
Ivan.
On 6 June 2011 14:51, Thomas <th.vanderv...@gmail.com> 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
>
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