On Thu, Feb 2, 2012 at 8:30 PM, Takahiro Hozumi <fat...@googlemail.com> wrote: > 1. Resolve a server name which client should be connected to. > If a client need to be connected to specific resource (chat room etc) > consistent hashing is useful. > http://nakkaya.com/2010/05/05/consistent-hashing-with-clojure/
> (defn sha1 [obj] > (let [bytes (.getBytes (with-out-str (pr obj)))] > (apply vector (.digest (MessageDigest/getInstance "SHA1") bytes)))) Ouch. Not simply the Java hash function? That will work for Clojure objects that don't contain identities, only values. Whereas the above has issues with sets and maps that are semantically equal but get put together differently: user=> (def x (array-map :a 1 :b 2)) #'user/x user=> (def y (array-map :b 2 :a 1)) #'user/y user=> (= (sha1 x) (sha1 y)) false Oopsie. -- 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
