You're adding two atoms together here:  (reset! index (+ index offset))

Thanks,
Ambrose


On Tue, May 27, 2014 at 3:43 PM, Dylan Gleason <dgleason8...@gmail.com>wrote:

> I am trying to read a TCP request via an instance of DataInputStream and
> am running into this error with the following code:
>
> (defn receive
>   [socket]
>   (with-open [reader (DataInputStream. (.getInputStream socket))]
>     (let [length   (read-length reader)
>           bytes-in (byte-array length)
>           offset   (atom 0)
>           index    (atom 0)]
>       (while (not= -1 @offset)
>         (reset! offset (.read reader bytes-in offset (- length index)))
>         (reset! index (+ index offset))))))
>
> For some reason, trying to update the value in offset appears to result in
> this casting error. I tried testing a similar expression at the REPL, and
> it works, e.g.
>
> > (def blah (atom 0))
> > (reset! blah 93)    ; no error
>
> It seems odd that Clojure would complain about this, since "93" is an
> instance of java.lang.Long -- why would Clojure be so annoyingly
> anal-retentive when setting the atom to a java.lang.Num? Also, if anyone
> has any ideas on how to make achieve this without using atoms, and what the
> best approach would be (a recursive solution using loop-recur, perhaps?)
>
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