Hi All, You may want to take a look at Prismatic's graph library, it does what you've described above in a slightly different way. Link: https://github.com/Prismatic/plumbing
On Sun, Apr 28, 2013 at 1:04 AM, Ben Wolfson <wolf...@gmail.com> wrote: > It's not too hard, though, to write a plet form that first does some > analysis on the bindings to see which of them depend on which others. I > believe I mentioned this elsewhere in the group as an example of why a > macro might want to macroexpand its arguments, because doing that is the > simplest way to find out where you've got a binding form. In: > > (plet [a 2 b (my-mystery-macro [a 5] a)] b) > > if my-mystery-macro introduces a binding for 'a', then the expressions can > be evaluated in parallel, since 'a' isn't free in the expression being > bound to 'b'; otherwise, 'a' *is* free in that expression and refers to the > earlier binding, and the two expressions can't be evaluated in parallel. > > > > On Sat, Apr 27, 2013 at 8:59 AM, Ben Wolfson <wolf...@gmail.com> wrote: > >> "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] >> >> > > > -- > 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. > > > -- -- 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.
