"guv" is broken if your let form introduces bindings that depend on earlier bindings:
user=> (plet [a 2 b a] b) CompilerException java.lang.RuntimeException: Unable to resolve symbol: a in this context, compiling:(NO_SOURCE_PATH:1) user=> (clojure.pprint/pprint (macroexpand-1 '(plet [a 2 b a] b))) (clojure.core/let [G__364 (clojure.core/future 2) G__365 (clojure.core/future a) ;;; oops! a @G__364 b @G__365] b) nil user=> In fact, both of them are broken in this way. On Sat, Apr 27, 2013 at 6:55 AM, Glen Mailer <glenja...@gmail.com> wrote: > Hi All, > > I was recently looking at how to make better use of parallelisation for > simple tasks in my compojure app, I had a construction similar to the > following: > > (views/some-view (api/api-call-1) (api/api-call-2) (api/api-call-3)) > > It seemed that the easiest way to introduce some parallelism here would be > in the style of a let form: > > (let [result-1 (api/api-call-1) > result-2 (api/api-call-2) > result-3 (api/api-call-3)] > (views/some-view result-1 result-2 result-3) > > There doesn't appear to be anything in core that does, this - after a > brief discussion in the IRC channel, I received the following two > suggestions: https://gist.github.com/jcromartie/5459350 and > https://gist.github.com/guv/5459364 > > I ended up going with the approach from "guv", as I understood it better - > and I moved the let form inside the view function to cut down on the > repetition a bit. > > Now, to my actual questions: > > What are the differences between the pmap approach and the futures > approach? > > And would a construction like this be useful in core? If so, how does it > potentially get there? > > > Thanks > Glen Mailer > Budding Clojurer > > > -- > -- > 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. > > > -- Ben Wolfson "Human kind has used its intelligence to vary the flavour of drinks, which may be sweet, aromatic, fermented or spirit-based. ... Family and social life also offer numerous other occasions to consume drinks for pleasure." [Larousse, "Drink" entry] -- -- 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.
