Hi Andy,
the issue you're having is that using the & for rest args captures the rest of
the arguments as a seq. Therefore when you pass a fn as the final parameter to
#'timed-agent, #'test-func is not bound to the fn you passed in but a seq
containing that fn. You either need to pull out the fn using something like
#'first or you can define #'timed-agent to deal with multiple arities:
(defn foo
"A simple function that will tell you whether you passed
in 0, 1 or 2 args"
([](println "no args"))
([a] (println "one arg"))
([a b] (println "two args!")))
Sam
---
http://sam.aaron.name
On 3 Nov 2011, at 21:57, AndyK wrote:
> I'm running into a strange problem that I can't see the bottom of.
> Wonder if someone can explain why I'm seeing the behavior I'm
> seeing...
>
> I have a function that uses a Java timer to run a function and can
> also check the results of that function by passing in an optional test
> function
>
> (defn timed-agent [limit timed-func & test-func]
> (let [a (agent 0)
>;; test-func can be defined here
>agent-func (fn [v] (let [result (timed-func v)]
> (when test-func (test-func result)) (inc
> v)))
>t (java.util.Timer.)
>tt (proxy [java.util.TimerTask] [] (run [] (send-off a agent-
> func)))]
>(set-validator! a #(> limit %))
>(.scheduleAtFixedRate t tt 1000 1000)))
>
> This works if I don't pass in a test function
> (timed-agent 10 prn)
> You will see output of 0 1 2 3...9
>
> This does not work if I pass in a test function
> (timed-agent 10 prn prn)
> You will see output of 0 and nothing more
>
> This does work if I define test-func within the function (on the
> commented line) - ex, as prn
> You will see 0 nil 1 nil 2 nil...9 nil
>
> First question - why can't I pass in a test function and have the
> timer loop work as expected
> Second question - is there a better way for me to set an upper bound
> on a Java timer using Clojure?
>
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