On Thu, Oct 8, 2009 at 7:49 PM, John Harrop <jharrop...@gmail.com> wrote:
> You might be able to do better than that, and dispense entirely with the
> separate polling thread.
>
Confirmed:
(def x (agent {:polling false :message "foo"}))
(defn poll [m]
(when (:polling m)
(prn (:message m))
(Thread/sleep 1000)
(send-off *agent* poll))
m)
(defn set-message [m mess]
(assoc m :message mess))
(defn start [m]
(send-off *agent* poll)
(assoc m :polling true))
(defn stop [m]
(assoc m :polling false))
(send-off x start)
The message "foo" should start repeating in the standard-output monitor
window of your IDE.
(send-off x set-message "bar")
The message "bar" should start repeating in the standard-output monitor
window of your IDE, in place of "foo".
(send-off x stop)
The output should stop, and look like this:
"foo"
"foo"
"foo"
"foo"
"bar"
"bar"
"bar"
with possibly different numbers of repetitions. Seems to indicate that this
strategy works beautifully for a periodically-repeating behavior that
accepts state-change messages, including start and stop signals.
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