(defn insert-async! [& args] (db-thread (try (apply jdbc/insert! args) (catch Throwable t t))))
db-thread is a macro that runs the body in a fixed thread pool, so IO isn't done inside a go block. On Thursday, August 1, 2013 3:33:29 AM UTC+9, tbc++ wrote: > > DB work is a IO operation, and IO shouldn't be done inside a go block (go > blocks use limited thread pools). > > So what about something like this? > > (defn handle-db [chan] > (thread > (while true > (let [[data result] (<! c)] > (run-db-transaction-as-normal data) > (>! result :done))))) > > Now spin up a few of these: > > (def db-chan (let [c (chan 4)] > (dotimes [x 4] > (handle-db c)) > c)) > > Now it's trivial to use this from a go block: > > (defn db-async [data] > (go > (let [c (chan)] > (>! db-chan [data c]) > (<! c)))) > > So this is the pattern: create processors using threads, then send data to > those processors via a shared channel, passing in a response channel. > > Anyways, that's the way I'm thinking these days. > > Timothy > > > > > On Wed, Jul 31, 2013 at 12:24 PM, Alice <doff...@gmail.com > <javascript:>>wrote: > >> I have an async http handler and I don't want it to consume a thread. >> >> On Thursday, August 1, 2013 3:16:52 AM UTC+9, tbc++ wrote: >> >>> Why not use <!! ? >>> >>> Timothy >>> >>> >>> On Wed, Jul 31, 2013 at 11:58 AM, Alice <doff...@gmail.com> wrote: >>> >>>> It doesn't produce a compile time error but I think it's not the >>>> correct code because the transaction can be committed while insert-async! >>>> is still executing. >>>> >>>> On Thursday, August 1, 2013 2:46:29 AM UTC+9, Sean Corfield wrote: >>>> >>>>> On Wed, Jul 31, 2013 at 10:29 AM, Alice <doff...@gmail.com> wrote: >>>>> > (go >>>>> > (jdbc/db-transaction [t-con db-spec] >>>>> > (<! (insert-async! t-con :fruit {:name "apple"})))) >>>>> >>>>> Does this work: >>>>> >>>>> (jdbc/db-transaction [t-con db-spec] >>>>> (go >>>>> (<! (insert-async! t-con :fruit {:name "apple"})))) >>>>> >>>>> -- >>>>> Sean A Corfield -- (904) 302-SEAN >>>>> An Architect's View -- http://corfield.org/ >>>>> World Singles, LLC. -- http://worldsingles.com/ >>>>> >>>>> "Perfection is the enemy of the good." >>>>> -- Gustave Flaubert, French realist novelist (1821-1880) >>>>> >>>> -- >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "Clojure" group. >>>> To post to this group, send email to clo...@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+u...@**googlegroups.com >>>> >>>> For more options, visit this group at >>>> http://groups.google.com/**group/clojure?hl=en<http://groups.google.com/group/clojure?hl=en> >>>> --- >>>> You received this message because you are subscribed to the Google >>>> Groups "Clojure" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to clojure+u...@**googlegroups.com. >>>> >>>> For more options, visit >>>> https://groups.google.com/**groups/opt_out<https://groups.google.com/groups/opt_out> >>>> . >>>> >>>> >>>> >>> >>> >>> >>> -- >>> “One of the main causes of the fall of the Roman Empire was that–lacking >>> zero–they had no way to indicate successful termination of their C >>> programs.” >>> (Robert Firth) >>> >> -- >> -- >> You received this message because you are subscribed to the Google >> Groups "Clojure" group. >> To post to this group, send email to clo...@googlegroups.com<javascript:> >> Note that posts from new members are moderated - please be patient with >> your first post. >> To unsubscribe from this group, send email to >> clojure+u...@googlegroups.com <javascript:> >> 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 unsubscribe from this group and stop receiving emails from it, send an >> email to clojure+u...@googlegroups.com <javascript:>. >> For more options, visit https://groups.google.com/groups/opt_out. >> >> >> > > > > -- > “One of the main causes of the fall of the Roman Empire was that–lacking > zero–they had no way to indicate successful termination of their C > programs.” > (Robert Firth) > -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.