This seems to be true: "I would have to say that the biggest surprise is how little they're needed in Clojure."
Run this search on Google: agent send clojure site:github.com The first 5 pages point me to examples from several years ago, or error reports, or unit tests. Nothing substantial or recent. I think it is interesting how many of the results are blog posts or gists -- people talk about agents much more then they actually use them. Still, there are some examples: https://github.com/aphyr/riemann/blob/302cff942f308771b1d8d837cdf9ce2c9090daed/src/riemann/pool.clj (defmacro with-pool "Evaluates body in a try expression with a symbol 'thingy claimed from the given pool, with specified claim timeout. Releases thingy at the end of the body, or if an exception is thrown, invalidates them and rethrows. Example: ; With client, taken from connection-pool, waiting 5 seconds to claim, send ; client a message. (with-pool [client connection-pool 5] (send client a-message))" [[thingy pool timeout] & body] ; Destructuring bind could change nil to a, say, vector, and cause ; unbalanced claim/release. `(let [thingy# (claim ~pool ~timeout) ~thingy thingy#] (try (let [res# (do ~@body)] (release ~pool thingy#) res#) (catch Throwable t# (invalidate ~pool thingy#) (throw t#))))) And: https://github.com/clojure/java.jmx/blob/master/src/main/clojure/clojure/java/jmx.clj (deftype Bean [state-ref] DynamicMBean (getMBeanInfo [_] (MBeanInfo. (.. _ getClass getName) ; class name "Clojure Dynamic MBean" ; description ( map->attribute-infos @state-ref) ; attributes nil ; constructors nil ; operations nil)) (getAttribute [_ attr] (@state-ref (keyword attr))) ( getAttributes [_ attrs] (let [result (AttributeList.)] (doseq [attr attrs] ( .add result (Attribute. attr (.getAttribute _ attr)))) result)) ( setAttribute [_ attr] (let [attr-name (.getName attr) attr-value (.getValue attr) state-update {(keyword attr-name) attr-value}] (condp = (type state-ref) clojure.lang.Agent (await (send state-ref (fn [state state-update] (merge state state-update)) state-update)) clojure.lang.Atom ( swap! state-ref merge state-update) clojure.lang.Ref (dosync (ref-set state-ref (merge @state-ref state-update)))))) (setAttributes [_ attrs] (let [attr-names (map (fn [attr] (.setAttribute _ attr) (.getName attr)) attrs)] (.getAttributes _ (into-array attr-names))))) I would love to see some other examples. On Wednesday, May 6, 2015 at 9:49:47 PM UTC-4, Surgo wrote: > > I'm not saying this is everyone's experience or anything, but at times I > have at times considered some deeper STM-work with agents but I could not > seem to penetrate the documentation at the time. I do not know if it's > different now > > -- Morgon > > On Wednesday, May 6, 2015 at 5:38:08 PM UTC-4, James Reeves wrote: >> >> On 6 May 2015 at 21:58, Alex Miller <al...@puredanger.com> wrote: >> >>> I would have to say that the biggest surprise is how little they're >>> needed in Clojure. The combination of immutable data, functions to update >>> complex data structures, and fast pure function updates with atoms actually >>> satisfies a large percentage of real use cases. >>> >> >> I'll echo this. I've been using Clojure for years, and I can't recall >> ever needing refs (or agents for that matter). >> >> - James >> > -- 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.
