I'll ask this differently. I do not see "a" used anywhere inside of that function. So why is it being given to that function?
On Tuesday, July 24, 2012 1:36:27 AM UTC-4, Philip Potter wrote: > > "a" is the current value of the agent. *agent* is the agent itself. > > Remember the universal update mechanism: an agent, atom or ref is updated > by applying a (normally) pure function to it; the function takes the > current state and returns the new state. > > Phil > On Jul 24, 2012 5:16 AM, "larry google groups" <lawrencecloj...@gmail.com> > wrote: > >> >> I am confused by this blog post: >> >> >> http://www.bestinclass.dk/index.clj/2009/09/php-vs-clojure-what-does-it-cost-to-be-old-school.html >> >> In particular, I am confuse by this function: >> >> (defn log-dumper >> [a] >> (Thread/sleep *write-delay*) >> (let [sql-statements (let [tmp @*sql-buffer*] >> (ref-set *sql-buffer* []) >> tmp)] >> (doseq [stmt sql-statements] >> (run *mysql-connection* stmt)) >> (send-off *agent* log-dumper))) >> >> >> It looks like "a" is being passed in as an argument to the function. But >> at the end of the function, *agent* is being passed into the function >> again. I don't see a point in this function where "a" is magically >> transformed into *agent*. I'm under the impression that this same agent is >> suppose to be sent, over and over again, every 5 minutes, for all eternity, >> into the function. But if the function is suppose to send the same agent to >> itself, 5 minutes in the future, then I would think that if the argument is >> named "a" then "a" is what would be send-off to the function again. >> >> The blog post says: >> >> ""send-off" myself (the *agent* is the thread) to the same function >> again, ie. keep running." >> >> How does this work? How does the final line know that *agent* is the "a" >> that was passed in as an argument? >> >> >> >> >> >> -- >> You received this message because you are subscribed to the Google >> Groups "Clojure" group. >> To post to this group, send email to clojure@googlegroups.com >> Note that posts from new members are moderated - please be patient with >> your first post. >> To unsubscribe from this group, send email to >> clojure+unsubscr...@googlegroups.com >> For more options, visit this group at >> http://groups.google.com/group/clojure?hl=en > > -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
