Hi, all I want to do sth. like query until timeout. So I write a function below. (defn wait-ls-ready [] (let [pair-fn (fn [] ( (Thread/sleep 1000) (let [ret (try (c/exec :ls) 0 (catch RuntimeException e -1) ), time-now (quot (System/currentTimeMillis) 1000)] '(ret (- time-now start-time)) ) ))] (loop [start-time (quot (System/currentTimeMillis) 1000) time-out 10] (let [[ret time-delta] (pair-fn)] (info node "Waiting gsql works...") (if (= 0 ret) 0 (if (> time-delta time-out) (throw (RuntimeException. (str "'ls' not working in " time-out "seconds."))) (recur start-time time-out)))) ) ) )
But it returns a NullpointerException after 1 seconds. Could anyone help me out? Thanks, Yihao -- 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/d/optout.