Huh, interesting. So, I had this set of maps that had the names of the
functions that I wanted to be started in their own threads once the app
started up, but apparently only the first one gets called:
:events-called-when-the-app-starts-that-run-in-their-own-threads-hooks #{
{:order-of-events 1 :event-name "omniture-fetch-new-data"}
{:order-of-events 2 :event-name "persist-new-log-data-to-database"}
{:order-of-events 3 :event-name
"omniture-call-api-for-report-if-status-is-ready"}
}
omniture-fetch-new-data fires up, but the other 2 functions do not. Does
the one sort of hijack everything else?
On Tuesday, March 5, 2013 3:24:14 PM UTC-5, larry google groups wrote:
>
>
> This surprises me. I thought I could start my app, then start some
> functions in separate threads, and then call Jetty to connect my app
> to a socket and have it serve requests. But the way I did this did not
> work. I had first had this:
>
> (defn -main [& args]
> (let [port (Integer/parseInt (first args))
> level-of-debugging (str (second args))]
> (try
> (set-the-current-debugging-level level-of-debugging)
> (um/update-interactions)
> (pe/set-event-namespace core-namespace)
> (pe/process-startup-hooks)
> (pe/process-startup-hooks-that-run-in-their-own-threads)
> (run-jetty #'app {:port (or port 8080) :join? false})
> (catch Exception e (debug/print-error-info e)))))
>
> In this case, run-jetty never got called. The function that starts up
> the other functions in their own threads is:
>
>
> (defn process-startup-hooks-that-run-in-their-own-threads []
> "2013-02-21- remember, each row in hooks is a map: {:order-of-events
> 2 :event-name 'delete-old-sessions'} "
> (let [hooks (sort-by :order-of-events (:events-called-when-the-app-
> starts-that-run-in-their-own-threads-hooks @um/interactions))]
> (doseq [x hooks]
> (let [event-as-string (:event-name x)
> event-as-symbol (symbol event-as-string)
> event (ns-resolve @event-namespace event-as-symbol)]
> (if-not (nil? event)
> (.start (Thread. (event))))))))
>
> This seems to somehow hijack the main thread, so that run-jetty never
> gets called.
>
> If I do this instead, then everything is fine:
>
>
> (defn -main [& args]
> (let [port (Integer/parseInt (first args))
> level-of-debugging (str (second args))]
> (try
> (set-the-current-debugging-level level-of-debugging)
> (um/update-interactions)
> (pe/set-event-namespace core-namespace)
> (pe/process-startup-hooks)
> (run-jetty #'app {:port (or port 8080) :join? false})
> (pe/process-startup-hooks-that-run-in-their-own-threads)
> (catch Exception e (debug/print-error-info e)))))
>
>
> run-jetty is called, and then the other functions startup .
>
> But why did my first version of -main not work the way I expected?
>
>
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