Excuse my ignorance of not knowing anything about CL and restarts but I
needed something like retry a while back.
I started with something like this
(defn do-something-that-might-fail []
(let [v (rand)]
(prn [:v v])
(when (> v 0.1)
(throw (ex-info "boom" {})))
v))
(loop [attempts 1]
(let [[ok? result] (try
[true (do-something-that-might-fail)]
(catch Exception e
[false e]))]
(cond
ok?
result
(= attempts 3)
(throw (ex-info "failed after 3 tries" {} result))
:else
(do (prn :retry)
(recur (inc attempts))))))
You don't want to catch all Exceptions, only the ones that you actually are
recoverable (eg. SocketTimeoutException). My example isn't pretty, but a
macro should clean it up nicely. I eventually went with a slightly
different solution but the essence remains the same: wrap it in a loop.
Maybe this helps.
On Thursday, June 19, 2014 6:25:04 PM UTC+2, Christopher Howard wrote:
>
> Does Clojure have restarts or continuable-errors like in CL? Or
> something similiar? If not, is that something that could be
> implemented some how?
>
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