FWIW, in Cursive, which is a big ball of mixed Clojure + Java, I've given up trying to use gen-class and have started using Java shims for everything. I like it a lot more than gen-class, which I always feel like I'm fighting. With the new Java->Clojure API in 1.6 (or the equivalent using RT.var() and friends for earlier versions) it's really not that hard, tool support is much better and IMO it's much cleaner. gen-class will always indirect method calls through a var but if you're worried about performance you can get the underlying function object with Java and call it directly, with the caveat that you then lose the ability to update it dynamically at the REPL.
I'd dearly love a deftype-style extend-type or similar which would allow base class extension. I know it's not encouraged in Clojure but one of Clojure's fundamental principles is exposing the host where it's pragmatic to do so, and both proxy and gen-class have some pretty serious warts for this purpose. On 5 April 2014 04:47, Anvar Karimson <an...@karimson.com> wrote: > Ok, thanks! I will have a look! > > > On Friday, 4 April 2014 16:43:20 UTC+1, Phillip Lord wrote: > >> >> Yeah, gen-class is the thing. Proxy, well, proxies, but genclass >> produces a statically compiled ahead of time class. It's a real Java >> class, so yes, you can use it from Clojure like any other Java class. >> >> Genclass is a little more painful than proxy, but probably a little less >> painful than having a combined Java/Clojure build. >> >> Phil >> >> Anvar Karimson <an...@karimson.com> writes: >> >> > Is that via gen-class? I have to admit that I am not very familiar with >> > gen-class, is it still possible to use the class from Clojure? >> > >> > Yes, that is probably the most pragmatic choice, premature optimization >> and >> > all that. >> > >> > On Friday, 4 April 2014 15:03:00 UTC+1, Phillip Lord wrote: >> >> >> >> Anvar Karimson <an...@karimson.com <javascript:>> writes: >> >> > I am trying to understand what the best course of action would be in >> the >> >> > following scenario: >> >> > >> >> > I have a Java base class that I need to extend. The class is >> fundamental >> >> to >> >> > my application and will be running fairly hot compared to other bits >> of >> >> > code in the application. Therefore I want it to execute as fast as >> >> > possible. The way I see it there are two options; >> >> > >> >> > 1) Use proxy >> >> > 2) Create a class in Java that provides the glue between Java and >> >> Clojure >> >> > and removes the need for extending the base class in Clojure. >> >> > >> >> > I would prefer to use option 1 but I am a little bit worried about >> the >> >> > performance implications of doing so, especially adding a level of >> >> > indirection by using map-lookup for accessing methods so I suspect I >> >> will >> >> > have to go with option 2. >> >> > >> >> > Any recommendations or alternatives? >> >> >> >> Or Option 3, create a class in Clojure which extends the Java. >> >> >> >> My suggestion, try number 1 which is easy, then performance test it. >> >> >> >> Phil >> >> >> >> -- >> Phillip Lord, Phone: +44 (0) 191 222 7827 >> Lecturer in Bioinformatics, Email: philli...@newcastle.ac.uk >> School of Computing Science, http://homepages.cs.ncl.ac. >> uk/phillip.lord >> Room 914 Claremont Tower, skype: russet_apples >> Newcastle University, twitter: phillord >> NE1 7RU >> > -- > 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. > -- 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.
