Thanks Alex! I am beginning to move away from design by interface. Actually making progress now.
Cheers, Jack On Sun, Jul 18, 2021 at 12:34 PM Alex Miller <alex.mil...@thinkrelevance.com> wrote: > definterface is generally considered a low-level tool in Clojure and > typically Clojure developers do not create interfaces directly like this. > > The two primary means of function abstraction/polymorphism are > multimethods (can dispatch on any aspect of any of the parameters to a > function) and protocols (which dispatch on the type of the first parameter > to the function). There are tradeoffs between these - the former is very > flexible, the latter is very similar to interfaces (and does use them under > the hood) so is limited to type-based dispatch but gets all the JVM > performance of that operation. > > On Saturday, July 17, 2021 at 7:44:18 PM UTC-5 jack...@topicquests.org > wrote: > >> Tanya, >> >> That did help, swapping ie4clj.api.Inferrable for its import. >> That, of course, got me into the next coding bug, about which I shall ask >> next (I am attempting to use doseq to walk a list and AND its Inferrable >> members) >> >> Meanwhile, I am truly surprised that you said >> >> I don't think it is the right way to use interfaces in clojure. >>> >> It's likely a result of dyslexia that I did not see that coming after >> studying all the online banter about interfaces and protocols.. I chose >> definterface because the examples showed how to specify the return values, >> and programming by interface is how I do Java. I'd like to discover what, >> precisely, to read and get past dyslexic events to learn how to use >> interfaces. >> >> Many thanks >> Jack >> >> On Sat, Jul 17, 2021 at 4:10 PM Tanya Moldovan <tanya.m...@gmail.com> >> wrote: >> >>> Hi, >>> >>> I don't think it is the right way to use interfaces in clojure. Take a >>> look at this >>> <https://medium.com/@ujjawaldixit099/implementing-java-interfaces-in-clojure-3e5f0b80ba14> >>> and this >>> <https://stackoverflow.com/questions/8614734/how-do-i-implement-a-java-interface-in-clojure/8615002> >>> . >>> You could create a java project with the interfaces you need and import >>> that instead. >>> >>> I think the issue is that this setup requires AOT and it might be >>> missing from your configuration. >>> To fix it try adding this to project.clj file: >>> >>> :profiles {:dev {:aot [ie4clj.api]}} >>> >>> It can be tricky If you want to do lein uberjar and generate a jar file. >>> >>> Alternatively, you can use compile-files >>> <https://clojuredocs.org/clojure.core/*compile-files*> (then you don't >>> need import statement). >>> (note that in your gist you had some errors when defining AndList, I've >>> fixed it) >>> (also take a look at the clojure style guide >>> <https://github.com/bbatsov/clojure-style-guide>, as AndList is not >>> really the way to name things in clojure )) ) >>> >>> (ns ie4clj.api) >>> >>> (definterface Inferrable >>> (^boolean eval []) >>> (^boolean evalMembers [members])) >>> >>> (ns ie4clj.AndList) >>> >>> (when *compile-files* >>> (require 'ie4clj.api)) >>> >>> (def AndList >>> (reify >>> ie4clj.api.Inferrable >>> (eval [_] true) >>> (evalMembers [_ m] true))) >>> >>> Hope this helps, >>> >>> >>> >>> On Sat, 17 Jul 2021 at 21:06, Jack Park <jack...@topicquests.org> wrote: >>> >>>> I created a gist >>>> https://gist.github.com/KnowledgeGarden/39742ae9ae641f0d8facb31b288ece4c >>>> >>>> which explains a ClassNotFoundException when I am importing and >>>> reifying a particular interface in another clj file. >>>> >>>> It's really baffling because, in the load order, core calls a test in a >>>> test file - getting that to compile landed on the solution of an (:import >>>> ...) statement; once that worked, then the code in that test calls another >>>> file AndList.clj which happens to have several places where it reifies the >>>> same interface. Except, with the same import statement, on that file, I get >>>> the error. Difficult to even find a decent StackOverflow because one such >>>> StackOverflow appears to be very similar, and the suggested fix is what I >>>> have now. >>>> >>>> Thanks in advance for ideas. >>>> Jack >>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "Clojure" group. >>>> To post to this group, send email to clo...@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+u...@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+u...@googlegroups.com. >>>> To view this discussion on the web visit >>>> https://groups.google.com/d/msgid/clojure/ffb09a94-5aa4-4600-8c9a-e0d00901df72n%40googlegroups.com >>>> <https://groups.google.com/d/msgid/clojure/ffb09a94-5aa4-4600-8c9a-e0d00901df72n%40googlegroups.com?utm_medium=email&utm_source=footer> >>>> . >>>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Clojure" group. >>> To post to this group, send email to clo...@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+u...@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+u...@googlegroups.com. >>> >> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/clojure/CADBYUPvwWc0UqGZ-WdgtvAmkzH0RZ34_0EbbLs3QshFC2%2B3BGw%40mail.gmail.com >>> <https://groups.google.com/d/msgid/clojure/CADBYUPvwWc0UqGZ-WdgtvAmkzH0RZ34_0EbbLs3QshFC2%2B3BGw%40mail.gmail.com?utm_medium=email&utm_source=footer> >>> . >>> >> -- > 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. > To view this discussion on the web visit > https://groups.google.com/d/msgid/clojure/5896bb81-7540-4116-baea-4d039db09d5dn%40googlegroups.com > <https://groups.google.com/d/msgid/clojure/5896bb81-7540-4116-baea-4d039db09d5dn%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "Clojure" group. 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