It looks very similar to the pattern I was trying to avoid in the first
place. I've also got the problem of multiple threads (and its been pointed
out that my original solution was not thread safe). In my experience bugs
of an 'extremely rare but could conceivably happen' nature are the sort of
thing that appear years after deployment when nobody understands the fine
detail of a system any more. I'm speculating of course but its the kind of
thing that brought down the UKs Air Traffic Control system with a 'never
before seen' bug just last week.
'
On Saturday, December 13, 2014 12:37:28 PM UTC, Sergey Didenko wrote:
>
> Some people use vars for seldom changing things. What do you think
> about this VS atoms?
>
> For example:
>
> (declare ^:dynamic *server*)
>
> (defn get-possibly-unbound-var [v]
> (try (var-get v)
> (catch Exception e
> nil)))
>
> (defn start-server! []
> (if (get-possibly-unbound-var *server*)
> (.start *server*)
> (def ^:dynamic *server*
> (run-jetty #'app {:port 8000 :join? false}))))
>
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