Re: puzzlement over lazy sequences
On Sep 12, 2011, at 11:28 PM, Ken Wesson wrote: But if, as you say, take, drop, etc. work for larger n, it should be easy to make nth work with larger n and non-random-access seqs, just by changing the non-random-access case to (first (drop n the-seq)). I'd be rather surprised if nth suddenly started giving linear performance on arrays for large values of n. If nth can't be made to work in constant time on arrays for n 2**31, then I'd favor the IllegalArgumentException approach. One can always do (first (drop …)) manually if linear performance is acceptable. -- 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
Re: puzzlement over lazy sequences
On Tue, Sep 13, 2011 at 2:39 AM, Michael Gardner gardne...@gmail.com wrote: On Sep 12, 2011, at 11:28 PM, Ken Wesson wrote: But if, as you say, take, drop, etc. work for larger n, it should be easy to make nth work with larger n and non-random-access seqs, just by changing the non-random-access case to (first (drop n the-seq)). I'd be rather surprised if nth suddenly started giving linear performance on arrays for large values of n. If nth can't be made to work in constant time on arrays for n 2**31, then I'd favor the IllegalArgumentException approach. One can always do (first (drop …)) manually if linear performance is acceptable. It already gives log32 rather than constant time performance on vectors, I think. That would stay the same. It can be extended to sorted-set and sorted-map with log2 time performance, again including with large-n support. On actual java.util collections and Java arrays it can just check if n exceeds 2^31 - 1, give not-found behavior if so, and otherwise punt to Java. And on non-random-access stuff it can use (first (drop n thingy)). -- Protege: What is this seething mass of parentheses?! Master: Your father's Lisp REPL. This is the language of a true hacker. Not as clumsy or random as C++; a language for a more civilized age. -- 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
Re: puzzlement over lazy sequences
Hi, On Tuesday, September 13, 2011 6:28:01 AM UTC+2, Ken Wesson wrote: They're trees of arrays of 32 items, and the trees can in principle have arbitrary depth. So the 2^31 limit on Java arrays doesn't impact the Clojure collections, it seems. are you sure? As far as I understood things (reading PersistentVector.java and [1]), there can only be 6 levels of nodes, because of the 32bit which are used to store an integer and because of the bit-shifting which is used to find the correct level. That would lead to a limit of 32^6 which is half of the 2^31: user= (= (Math/pow 2 31) (* 2 (Math/pow 32 6))) true :-) Regards, Stefan [1] http://blog.higher-order.net/2009/02/01/understanding-clojures-persistentvector-implementation/ -- 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
good ways to deal with compiler errors in SLIME (emacs)
Hi, How can I see the error line number in SLIME? Or even somehow place editor point on the place of the error? For example when I load file in a lein repl, it prints: java.lang.Exception: Unable to resolve symbol: dd in this context (mytest.clj:447) However when I load this file in the SLIME repl it just prints: Unable to resolve symbol: dd in this context ... 0 [QUIT] Quit to the SLIME top level and a long backtrace without error line information. P.S. Sorry, if this is offtopic. Regards, Sergey. -- 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
Re: puzzlement over lazy sequences
On Tue, Sep 13, 2011 at 4:18 AM, Stefan Kamphausen ska2...@googlemail.com wrote: Hi, On Tuesday, September 13, 2011 6:28:01 AM UTC+2, Ken Wesson wrote: They're trees of arrays of 32 items, and the trees can in principle have arbitrary depth. So the 2^31 limit on Java arrays doesn't impact the Clojure collections, it seems. are you sure? As far as I understood things (reading PersistentVector.java and [1]), there can only be 6 levels of nodes, because of the 32bit which are used to store an integer and because of the bit-shifting which is used to find the correct level. I said the tree can *in principle* have arbitrary depth. Bit-shifting can be done on BigIntegers, too. -- Protege: What is this seething mass of parentheses?! Master: Your father's Lisp REPL. This is the language of a true hacker. Not as clumsy or random as C++; a language for a more civilized age. -- 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
ClojureScript for CouchDB
While reading about ClojureScript, I saw a couple of mentions of CouchDB as a use case for ClojureScript. Would anyone care to elaborate? Is this anything more than an abstract idea? There is no CouchDB compile target AFAIK, and I can't see how any of the others would work out of the box. The simplest approach would be to compile to a couch app, and let couchapp compile and upload the design doc. To do this, no optimizations should be applied, as we need multiple files. But then either CommonJS requires or Couchapp macros will need to be generated. Or can this be made to work with Closure style requires as well? The other option is to directly compile ClojureScript to a design doc. I have no idea how hard this is. Pepijn -- 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
Re: ClojureScript for CouchDB
Just a little remark: Keep in mind, that clutch https://github.com/ashafa/clutch comes with a CouchDB view server that can execute Clojure code. So compiling to JS only seems desirable to me, when you can't configure an additional view server on your CouchDB. Performance wise, it should make no big difference, since JS views are also executed on a separate view server. regards 2011/9/13 Pepijn de Vos pepijnde...@gmail.com: While reading about ClojureScript, I saw a couple of mentions of CouchDB as a use case for ClojureScript. Would anyone care to elaborate? Is this anything more than an abstract idea? There is no CouchDB compile target AFAIK, and I can't see how any of the others would work out of the box. The simplest approach would be to compile to a couch app, and let couchapp compile and upload the design doc. To do this, no optimizations should be applied, as we need multiple files. But then either CommonJS requires or Couchapp macros will need to be generated. Or can this be made to work with Closure style requires as well? The other option is to directly compile ClojureScript to a design doc. I have no idea how hard this is. Pepijn -- __ Herwig Hochleitner -- 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
heaps in clojure
Hi Everybody, I have a very large, but with finite size, collection. I would like to get like first 10 elements in the sorted list . I would use a heap if I were in c++ .. is there a inbuilt implementation of this in clojure? .. Is there some other way to achieve this? some sort of lazy sort would be perfect. I know I need the full collection to start with .. but that is fine. Thanks, Sunil. -- 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
Re: heaps in clojure
There is the inbuilt sort function, also sort-by is useful. In The joy of clojure, there were an example of a lazy sort. It can be found here: http://www.manning.com/fogus/ In the file q.clj in the source code. Jonathan On Tue, Sep 13, 2011 at 1:44 PM, Sunil S Nandihalli sunil.nandiha...@gmail.com wrote: Hi Everybody, I have a very large, but with finite size, collection. I would like to get like first 10 elements in the sorted list . I would use a heap if I were in c++ .. is there a inbuilt implementation of this in clojure? .. Is there some other way to achieve this? some sort of lazy sort would be perfect. I know I need the full collection to start with .. but that is fine. Thanks, Sunil. -- 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 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
Re: How to compose futures?
I've been spending a lot of time on the continuations aspect: http://github.com/stuartsierra/cljque -S -- 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
Re: ClojureScript for CouchDB
First, what Herwig said. :-) Second, it's not outside of the realm of possibility that clutch might eventually be able to take .cljs files (or clojure/cljs source inline via clutch macro), invoke the cljs compiler, and use its existing functionality to upload the resulting view functions' code to your couchdb instance. It certainly would be pleasant to be able to write couch views in Clojure without messing with the view server setup (though clutch 0.2.5 simplifies this significantly). Of course, you'd lose access to the wealth of Clojure (and Java) libraries available with the Clojure view server, so the tradeoffs are multivariate. - Chas On Sep 13, 2011, at 6:24 AM, Herwig Hochleitner wrote: Just a little remark: Keep in mind, that clutch https://github.com/ashafa/clutch comes with a CouchDB view server that can execute Clojure code. So compiling to JS only seems desirable to me, when you can't configure an additional view server on your CouchDB. Performance wise, it should make no big difference, since JS views are also executed on a separate view server. regards 2011/9/13 Pepijn de Vos pepijnde...@gmail.com: While reading about ClojureScript, I saw a couple of mentions of CouchDB as a use case for ClojureScript. Would anyone care to elaborate? Is this anything more than an abstract idea? There is no CouchDB compile target AFAIK, and I can't see how any of the others would work out of the box. The simplest approach would be to compile to a couch app, and let couchapp compile and upload the design doc. To do this, no optimizations should be applied, as we need multiple files. But then either CommonJS requires or Couchapp macros will need to be generated. Or can this be made to work with Closure style requires as well? The other option is to directly compile ClojureScript to a design doc. I have no idea how hard this is. Pepijn -- __ Herwig Hochleitner -- 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 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
Re: ClojureScript for CouchDB
Just an idea at the moment. We need more people with knowledge of CouchDB to work on it. -Stuart Sierra clojure.com -- 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
Problem with insert-values (clojure.contrib.sql)
Houston, I have a problem: (sql/with-connection db_spec (sql/insert-values MyTable [Number Name FloatValue] [5, A, 2.0] [6 ,B, 3.0]) This works perfectly fine. Now I'm trying to do the following: (def x [[5, A, 2.0] [6 ,B, 3.0]]) (sql/with-connection db_spec (sql/insert-values MyTable [Number Name FloatValue] x)) I get the error: There are more columns in the INSERT statement than values specified in the VALUES clause. The number of values in the VALUES clause must match the number of columns specified in the INSERT statement How do I have to put x in the insert-values function? I guess it needs to be expaned somehow. I tried a couple of things (doall, doseq,...) No success.. Thanks. - Finn -- 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
Re: Problem with insert-values (clojure.contrib.sql)
Hi, comparing the two calls, I suppose you need apply. (def x [[5, A, 2.0] [6 ,B, 3.0]]) (sql/with-connection db_spec (apply sql/insert-values MyTable [Number Name FloatValue] x)) -- 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
Re: ClojureScript for CouchDB
What needs to be done? Pepijn On Sep 13, 2011, at 2:30 PM, Stuart Sierra wrote: Just an idea at the moment. We need more people with knowledge of CouchDB to work on it. -Stuart Sierra clojure.com -- 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 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
Re: heaps in clojure
On Tue, Sep 13, 2011 at 7:44 AM, Sunil S Nandihalli sunil.nandiha...@gmail.com wrote: Hi Everybody, I have a very large, but with finite size, collection. I would like to get like first 10 elements in the sorted list . I would use a heap if I were in c++ .. is there a inbuilt implementation of this in clojure? .. Is there some other way to achieve this? some sort of lazy sort would be perfect. I know I need the full collection to start with .. but that is fine. A seq on a sorted set should be pretty efficient. (take 3 (sorted-set 8 2 1 4 6 9 7 3)) ;= (1 2 3) --Chouser -- 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
Re: Problem with insert-values (clojure.contrib.sql)
oh yes. Now it works. Thanks for the quick response! BTW: Does someone know how I can keep the connection always open? If I understand it right, with-connection does a connect and login to the db each time it gets called. Isn't this quite inefficient? - Finn -- 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
[ANN] Clojure 1.3 RC0
Clojure 1.3 RC0 is now available at http://clojure.org/downloads Changes since Beta 3: * Optimization should not demote BigInts (CLJ-836) * Added Intrinsics * fix nary-inline so *unchecked-math* works again Please download it and let us know how it works for you. 1.3 is getting close. -- 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
Re: Problem with insert-values (clojure.contrib.sql)
On Tue, Sep 13, 2011 at 6:49 AM, finbeu info_pe...@t-online.de wrote: BTW: Does someone know how I can keep the connection always open? If I understand it right, with-connection does a connect and login to the db each time it gets called. Isn't this quite inefficient? Take a look at https://github.com/clojure/java.jdbc/blob/master/doc/clojure/java/jdbc/ConnectionPooling.md That's pretty much what we use at World Singles. -- Sean A Corfield -- (904) 302-SEAN An Architect's View -- http://corfield.org/ World Singles, LLC. -- http://worldsingles.com/ Railo Technologies, Inc. -- http://www.getrailo.com/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) -- 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
Re: good ways to deal with compiler errors in SLIME (emacs)
On Tue, Sep 13, 2011 at 1:55 AM, Sergey Didenko sergey.dide...@gmail.com wrote: How can I see the error line number in SLIME? Or even somehow place editor point on the place of the error? However when I load this file in the SLIME repl it just prints: Unable to resolve symbol: dd in this context If you compile using C-c C-k (where it sends the filename instead of the contents of the file) then it can determine line numbering. -Phil -- 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
Re: [ANN] Clojure 1.3 RC0
On Tue, Sep 13, 2011 at 6:02 AM, Christopher Redinger redin...@gmail.com wrote: Clojure 1.3 RC0 is now available at http://clojure.org/downloads Changes since Beta 3: * Optimization should not demote BigInts (CLJ-836) * Added Intrinsics Could someone speak to this change since it didn't have an attached JIRA ticket? It looks like an optimization to use direct bytecodes rather than static method calls for a certain set of operations in some contexts? * fix nary-inline so *unchecked-math* works again Please download it and let us know how it works for you. 1.3 is getting close. We'll be running tests today on dev, CI and probably QA. We're looking to take a new build of our platform into production this week, which has a LOT more Clojure in it and, if RC0 works out, that'll be in our production build too. -- Sean A Corfield -- (904) 302-SEAN An Architect's View -- http://corfield.org/ World Singles, LLC. -- http://worldsingles.com/ Railo Technologies, Inc. -- http://www.getrailo.com/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) -- 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
Re: Clojure vs Scala - anecdote
I adore Clojure as well, but could this success not be partially due to the reimplementing for the second time phenomenon? i.e. if you re- wrote the entire thing in Scala again, perhaps you would see similar gains in brevity etc? On Sep 6, 10:32 pm, Sean Corfield seancorfi...@gmail.com wrote: I just wanted to share this experience from World Singles... Back in November 2009, we started developing with Scala. We needed a long-running process that published large volumes of changes from our member database as XML packets published to a custom search engine. The mapping from half a dozen tables in the database to a flat XML schema was pretty complex and the company had tried a number of solutions with mixed success in the past. I introduced Scala based on the promises of performance, concurrency and type safety - and conciseness (especially with XML being a native data type in Scala). We've been running the Scala publishing daemons in production for most of two years. Generally they work pretty well but, under stress, they tend to hit Out of Memory exceptions and, after a lot of poking around, we became fairly convinced it was due (at least in part) to the default actor implementation in Scala. Scala is going to fold in Akka soon and we had been considering migrating to Akka anyone... But having introduced Clojure this year (after experimenting with it since about May last year), we figured we'd have a short spike to create a Clojure version of the Scala code to see how it worked out. It took about 15 hours to recreate the publishing daemon in Clojure and get it to pass all our tests. Today we ran a soak test publishing nearly 300,000 profiles in one run. The Scala code would fail with OoM exceptions if we hit it with 50,000 profiles in one run (sometimes less). The Clojure code sailed thru and is still happily running - so we'll be replacing the Scala code during our next production build. The other aspect that's interesting is that the Scala code totaled about 1,000 lines (about 31k characters of code). The Clojure replacement is just under 260 lines (around 11.5k characters of code). Neither code base has much in the way of comments (*ahem* - I'm not proud of that, just pointing out that there's no noise offsetting the code comparison). That doesn't include unit tests either, it's just the raw production code. The form of the Clojure code mostly follows the form of the Scala code, most of the same functions - it was very functional Scala - with some refactoring to helper functions to make it more modular and more maintainable. The net result is (obviously) that we'll be taking the Clojure publishing daemon to production and we'll be dropping Scala completely. Kudos to Rich Hickey and the Clojure/core team for creating a great general purpose language that can solve big problems - thank you! -- Sean A Corfield -- (904) 302-SEAN An Architect's View --http://corfield.org/ World Singles, LLC. --http://worldsingles.com/ Railo Technologies, Inc. --http://www.getrailo.com/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) -- 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
Re: Clojure vs Scala - anecdote
Isn't it Brooks who said you will throw it away at least 3 times, or something like this ? :) 2011/9/13 Nathan Sorenson n...@sfu.ca I adore Clojure as well, but could this success not be partially due to the reimplementing for the second time phenomenon? i.e. if you re- wrote the entire thing in Scala again, perhaps you would see similar gains in brevity etc? On Sep 6, 10:32 pm, Sean Corfield seancorfi...@gmail.com wrote: I just wanted to share this experience from World Singles... Back in November 2009, we started developing with Scala. We needed a long-running process that published large volumes of changes from our member database as XML packets published to a custom search engine. The mapping from half a dozen tables in the database to a flat XML schema was pretty complex and the company had tried a number of solutions with mixed success in the past. I introduced Scala based on the promises of performance, concurrency and type safety - and conciseness (especially with XML being a native data type in Scala). We've been running the Scala publishing daemons in production for most of two years. Generally they work pretty well but, under stress, they tend to hit Out of Memory exceptions and, after a lot of poking around, we became fairly convinced it was due (at least in part) to the default actor implementation in Scala. Scala is going to fold in Akka soon and we had been considering migrating to Akka anyone... But having introduced Clojure this year (after experimenting with it since about May last year), we figured we'd have a short spike to create a Clojure version of the Scala code to see how it worked out. It took about 15 hours to recreate the publishing daemon in Clojure and get it to pass all our tests. Today we ran a soak test publishing nearly 300,000 profiles in one run. The Scala code would fail with OoM exceptions if we hit it with 50,000 profiles in one run (sometimes less). The Clojure code sailed thru and is still happily running - so we'll be replacing the Scala code during our next production build. The other aspect that's interesting is that the Scala code totaled about 1,000 lines (about 31k characters of code). The Clojure replacement is just under 260 lines (around 11.5k characters of code). Neither code base has much in the way of comments (*ahem* - I'm not proud of that, just pointing out that there's no noise offsetting the code comparison). That doesn't include unit tests either, it's just the raw production code. The form of the Clojure code mostly follows the form of the Scala code, most of the same functions - it was very functional Scala - with some refactoring to helper functions to make it more modular and more maintainable. The net result is (obviously) that we'll be taking the Clojure publishing daemon to production and we'll be dropping Scala completely. Kudos to Rich Hickey and the Clojure/core team for creating a great general purpose language that can solve big problems - thank you! -- Sean A Corfield -- (904) 302-SEAN An Architect's View --http://corfield.org/ World Singles, LLC. --http://worldsingles.com/ Railo Technologies, Inc. --http://www.getrailo.com/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) -- 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 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
Programmer Day
(println (apply str (map char [72 97 112 112 121 32 80 114 111 103 114 97 109 109 101 114 32 68 97 121 33]))) --- Wilker Lúcio http://about.me/wilkerlucio/bio Kajabi Consultant +55 81 82556600 -- 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
Re: Programmer Day
On Tue, Sep 13, 2011 at 12:31 PM, Wilker wilkerlu...@gmail.com wrote: (println (apply str (map char [72 97 112 112 121 32 80 114 111 103 114 97 109 109 101 114 32 68 97 121 33]))) What kind of day is that, anyway? (let [m map, c comp, p partial, s str] (m (c symbol (p apply s) (p m (c char dec int)) s) '[ibqqz qsphsbnnfs ebz])) --Chouser -- 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
Re: Migration to 1.3 for mortals
On Sep 13, 1:44 am, Stuart Sierra the.stuart.sie...@gmail.com wrote: Since the new, separated contrib libraries are supposed to be compatible with Clojure 1.2, you could perhaps also start migrating one lib at a time at your leisure. This might even enable you to contribute to a migration document. Yes, this is what I am hoping people will do. Move to the new libraries first, then switch over to Clojure 1.3. That is exactly our plan, except we probably won't start immediately, as the word leisure in the paragraph above doesn't quite apply to our current situation :-) thanks, --J. -- 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
Re: Clojure vs Scala - anecdote
“Plan to throw one away.” -- 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
Re: Clojure vs Scala - anecdote
On Tue, Sep 13, 2011 at 9:48 AM, Nathan Sorenson n...@sfu.ca wrote: I adore Clojure as well, but could this success not be partially due to the reimplementing for the second time phenomenon? i.e. if you re- wrote the entire thing in Scala again, perhaps you would see similar gains in brevity etc? Well, the Scala world has moved on quite a bit since 2009 so I could certainly make it somewhat more concise (I'd use the parallel collections in 2.9 instead of actors and I hope there's a better SQL abstraction by now so I could drop the ResultSet collection wrapper I wrote). I doubt I could reduce it by a factor of three which is what it would take to get close to the Clojure code. I don't know who posted it on HN but I see it's also on DZone and so it's generated a lot of noise out there and now I'm probably going to do a more detailed comparison and analysis to post on my blog, to answer some of the critical voices on HN... It was intended to be purely anecdotal but that doesn't seem to satisfy anyone! :) -- Sean A Corfield -- (904) 302-SEAN An Architect's View -- http://corfield.org/ World Singles, LLC. -- http://worldsingles.com/ Railo Technologies, Inc. -- http://www.getrailo.com/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) -- 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
Re: good ways to deal with compiler errors in SLIME (emacs)
Thanks, Phil ! That's it. I was using slime-load-file instead of slime-compile-and-load-file If you compile using C-c C-k (where it sends the filename instead of the contents of the file) then it can determine line numbering. -- 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
Re: heaps in clojure
There is java.util.PriorityQueue, which is heap-based: http://download.oracle.com/javase/1,5.0/docs/api/java/util/PriorityQueue.html -Jason On Sep 13, 4:44 am, Sunil S Nandihalli sunil.nandiha...@gmail.com wrote: Hi Everybody, I have a very large, but with finite size, collection. I would like to get like first 10 elements in the sorted list . I would use a heap if I were in c++ .. is there a inbuilt implementation of this in clojure? .. Is there some other way to achieve this? some sort of lazy sort would be perfect. I know I need the full collection to start with .. but that is fine. Thanks, Sunil. -- 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
Re: Clojure vs Scala - anecdote
Oh, it was just one, after all ? Please, don't tell this to my boss :-D 2011/9/13 Meikel Brandmeyer m...@kotka.de “Plan to throw one away.” -- 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 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
Macros in ClojureScript
While working with ClojureScript I came across a interesting question. When compiling cljs files, how does Clojure handle macros? Normally macros are run at compile-time, but in this case the compile-time platform is completely different than the run time platform. My guess is that the compiler assumes that clojure.core.first (for instance) functions exactly the same for both the JVM and the JS versions of Clojure, but I could be wrong there. The only other possibility I can see is if ClojureScript has some internal JS VM it uses only for macro expanding. So what is the situation here? Thanks for your time, Timothy -- “One of the main causes of the fall of the Roman Empire was that–lacking zero–they had no way to indicate successful termination of their C programs.” (Robert Firth) -- 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
N00b alert! - A question on immutable/mutable data structures...
For the most part, I *believe* I understand why immutable data structures with transactions are important to manage concurrent operations to shared data, but I often wonder why it matters in some cases... For example, what if I have a hash-map that needs to handle concurrent changes to the data structure, but never needs to have concurrent changes to a given piece of data (i.e a key/value pair). Wouldn't there be value in being able to modify the data in-place without making a copy, or needing to endure the overhead associated with STM? And if what I am suggesting is reasonable how can I create a mutable hash-map in Clojure and still use (mostly) the same access functions. Notes: * Yes, I have watched Rich's video on identity and state, but it hasn't helped my understand the above scenario. * I am not suggesting a hash-map data structure should support mixed operations. Thanks, Trevor -- 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
Re: Macros in ClojureScript
Hi, 2011/9/14 Timothy Baldridge tbaldri...@gmail.com While working with ClojureScript I came across a interesting question. When compiling cljs files, how does Clojure handle macros? Normally macros are run at compile-time, but in this case the compile-time platform is completely different than the run time platform. My guess is that the compiler assumes that clojure.core.first (for instance) functions exactly the same for both the JVM and the JS versions of Clojure, but I could be wrong there. The only other possibility I can see is if ClojureScript has some internal JS VM it uses only for macro expanding. So what is the situation here? My understanding is that ClojureScript macros are Clojure macros, taking Clojure forms as their inputs. These clojure forms represent the literal ClojureScript data passed in the macro call in the cljs code. The macro plays with its input forms as usual, and gives back clojure forms which will be seamlessly retrofitted to ClojureScripts forms in the right place, before ClojureScript to Javascript 'compilation'. HTH, -- Laurent Thanks for your time, Timothy -- “One of the main causes of the fall of the Roman Empire was that–lacking zero–they had no way to indicate successful termination of their C programs.” (Robert Firth) -- 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 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
Re: N00b alert! - A question on immutable/mutable data structures...
To my knowledge, there are no built-in data structures that are mutable and that use the same access functions. There are built-in data structures called transients that are mutable, and use almost the same hash functions. Read the docs on transient, persistent!, conj!, etc. Transient data structures are restricted to be modified from a single thread, to avoid concurrency issues. Any attempt to modify a transient data structure from multiple threads is detected as an error at run time. Note that even the immutable data structures do not make a copy of the entire data structure. If the data structure is large, most of the data is shared between the old and new data structure. See the tree example on this Wikipedia page for a small example, but I know I've seen elsewhere pictures of examples closer to Clojure's persistent data structure implementations: http://en.wikipedia.org/wiki/Persistent_data_structure Your scenario: What if I have a hash-map that needs to handle concurrent changes to the data structure, but never needs to have concurrent changes to a given piece of data (i.e. a key/value pair). My question: How do you know, in advance, that it doesn't need to handle such concurrent changes? If it is because you have multiple threads that will always modify disjoint subsets of the keys, then you could have a separate hash-map for each of those sets of keys (perhaps a transient), and modify each one from its own thread. Readers of the hash map would then have to search for keys in multiple tables, or if it was easy to calculate in advance which table the key must be in, then only one table lookup is sufficient. Andy On Tue, Sep 13, 2011 at 4:00 PM, Trevor tcr1...@gmail.com wrote: For the most part, I *believe* I understand why immutable data structures with transactions are important to manage concurrent operations to shared data, but I often wonder why it matters in some cases... For example, what if I have a hash-map that needs to handle concurrent changes to the data structure, but never needs to have concurrent changes to a given piece of data (i.e a key/value pair). Wouldn't there be value in being able to modify the data in-place without making a copy, or needing to endure the overhead associated with STM? And if what I am suggesting is reasonable how can I create a mutable hash-map in Clojure and still use (mostly) the same access functions. Notes: * Yes, I have watched Rich's video on identity and state, but it hasn't helped my understand the above scenario. * I am not suggesting a hash-map data structure should support mixed operations. Thanks, Trevor -- 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 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
Re: N00b alert! - A question on immutable/mutable data structures...
For example, what if I have a hash-map that needs to handle concurrent changes to the data structure, but never needs to have concurrent changes to a given piece of data (i.e a key/value pair). Wouldn't there be value in being able to modify the data in-place without making a copy, or needing to endure the overhead associated with STM? Hi Trevor, You should endure the overhead of the STM if you need what the STM provides: coordination of activity across identities. But there are several things in Clojure that provide identities without STM. In your example, you could place a map inside an atom, which provides atomic transitions between values, but no coordination. Abandoning values entirely should be highly motivated by a specific need. If you're there, then Java's concurrent maps are good and appropriate. Stuart Halloway Clojure/core http://clojure.com -- 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
Re: Macros in ClojureScript
You can reference macros defined in *clojure* files that are on your classpath like this: (ns my.namespace (:require-macros [my.macros :as my]) The ClojureScript compiler will use these macros to expand your ClojureScript source. Works great. David On Tue, Sep 13, 2011 at 6:31 PM, Timothy Baldridge tbaldri...@gmail.comwrote: While working with ClojureScript I came across a interesting question. When compiling cljs files, how does Clojure handle macros? Normally macros are run at compile-time, but in this case the compile-time platform is completely different than the run time platform. My guess is that the compiler assumes that clojure.core.first (for instance) functions exactly the same for both the JVM and the JS versions of Clojure, but I could be wrong there. The only other possibility I can see is if ClojureScript has some internal JS VM it uses only for macro expanding. So what is the situation here? Thanks for your time, Timothy -- “One of the main causes of the fall of the Roman Empire was that–lacking zero–they had no way to indicate successful termination of their C programs.” (Robert Firth) -- 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 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
Re: N00b alert! - A question on immutable/mutable data structures...
Thanks for the quick responses.
I'll try to answer Andy's question: How do you know, in advance, that
it doesn't need to handle such concurrent changes? ... and at the
same time I will try to provide this example to Stuart, hoping I can
see how using a map inside an atom might work:
Let's say my users log into a web page and each user has a queue that
does stuff for them. Since the users id is unique and each user can
only be logged in from one session, when I use the user id as a key
within a hash-map then I know *well-enough* there will not be any
concurrent changes to that key value pair, particularly since enqueing
means each change is actually an just addition to the stack. -- So I
am picking queue's to make a point... -- Queue's are chosen over lists
as they are both constant time and fast. Being atomic is great, but
wouldn't making a copy of a queue and re-assembling it defeat the
purpose of using it?
So let's try this:
(def user-queues* (atom (hash-map)))
#'project/user-queues*
(swap! user-queues* assoc user1 clojure.lang.PersistentQueue/EMPTY)
{user1 #PersistentQueue clojure.lang.PersistentQueue@0}
(@user-queues* user1)
#PersistentQueue clojure.lang.PersistentQueue@0
I would like to add an item to the users queue, but it seems when
using an atom I can only swap in and out the value as opposed to
modifying the value in-place.
So let's start with just the basic atom'd queue:
(def q (atom clojure.lang.PersistentQueue/EMPTY))
#'project/q
(swap! q conj (seconds))
#PersistentQueue clojure.lang.PersistentQueue@d3232253
(apply list (swap! q conj (seconds)))
(1315961557 1315961570)
awesome.
Now I want to store each users queue in the user-queues* hash-map. How
would I do that while maintaining a real queue? My initial attempts
always lead to reading the full queue into a list, then to conj and
item on that list, then I have to remake a queue to then be stored
back into the map via swapso it's at that point I might as well
not be using a queue - right?
Certainly hash-maps with queue's would be a reasonable idea - right?.
Thanks.
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Calling a Java call with array from Clojure
I have a following API call that I need to make from Clojure: class A doSomething(java.lang.String arg1, String... args) so I tried (def a (new A)) ;this works (.doSomething a abc efg hij) ;this doesn't work giving me no matching method found: doSomething for class A -- 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
Re: Calling a Java call with array from Clojure
user= (class (into-array String [s a])) [Ljava.lang.String; Luc P. On Tue, 13 Sep 2011 18:21:31 -0700 (PDT) ron peterson peterson.ron...@gmail.com wrote: I have a following API call that I need to make from Clojure: class A doSomething(java.lang.String arg1, String... args) so I tried (def a (new A)) ;this works (.doSomething a abc efg hij) ;this doesn't work giving me no matching method found: doSomething for class A -- Luc P. The rabid Muppet -- 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
Re: Calling a Java call with array from Clojure
Oups I did read the code entirely... you defined a varg method ? On Tue, 13 Sep 2011 21:34:33 -0400 Luc Prefontaine lprefonta...@softaddicts.ca wrote: user= (class (into-array String [s a])) [Ljava.lang.String; Luc P. On Tue, 13 Sep 2011 18:21:31 -0700 (PDT) ron peterson peterson.ron...@gmail.com wrote: I have a following API call that I need to make from Clojure: class A doSomething(java.lang.String arg1, String... args) so I tried (def a (new A)) ;this works (.doSomething a abc efg hij) ;this doesn't work giving me no matching method found: doSomething for class A -- Luc P. The rabid Muppet -- 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
Re: Calling a Java call with array from Clojure
My typos errors are horrible tonight, new laptop, new keyboard. So if you defined a variable argument Java method the String array should work. But I am not certain about the intent of ... in your code excerpt. On Tue, 13 Sep 2011 21:43:03 -0400 Luc Prefontaine lprefonta...@softaddicts.ca wrote: Oups I did read the code entirely... you defined a varg method ? On Tue, 13 Sep 2011 21:34:33 -0400 Luc Prefontaine lprefonta...@softaddicts.ca wrote: user= (class (into-array String [s a])) [Ljava.lang.String; Luc P. On Tue, 13 Sep 2011 18:21:31 -0700 (PDT) ron peterson peterson.ron...@gmail.com wrote: I have a following API call that I need to make from Clojure: class A doSomething(java.lang.String arg1, String... args) so I tried (def a (new A)) ;this works (.doSomething a abc efg hij) ;this doesn't work giving me no matching method found: doSomething for class A -- Luc P. The rabid Muppet -- 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
Rounding the edges of an Emacs beginner
Hey all, So I'm still an avid vim user. But I see a lot of power in the swank slime setup, and have been teaching myself emacs to try to leverage it. There are still a few tricks I haven't got. Maybe my notes are just disorganised, but I was hoping fellow Clojurians can chime in. - ? getting an error when I i) M-x slime-connect or ii) send a form (+1 1) to swank ; this is after i) a lein swank then ii) in another window emacs M-x connect . ** Evaluating Slime forms seems to work after that webkell@ubuntu:~/Projects/bkell$ lein swank Listening for transport dt_socket at address: 36109 Connection opened on localhost port 4005. exception in read loop java.lang.Exception: Error reading swank message *# this happens when slime tries to connect with M-x slime-connect * at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ... at java.lang.reflect.Constructor.newInstance(Constructor.java:513) ... at clojure.lang.Var.applyTo(Var.java:518) at clojure.main.main(main.java:37) exception in control loop java.lang.InterruptedException at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.reportInterruptAfterWait(AbstractQueuedSynchronizer.java:1961) ... at swank.util.concurrent.mbox$receive.invoke(mbox.clj:28) at swank.core$control_loop.invoke(core.clj:401) ... at swank.swank$connection_serve$fn__1720.doInvoke(swank.clj:20) ... at java.lang.Thread.run(Thread.java:619) - ? howto do Code completion (clojure, and elisp ) - ? close a slime-repl connection - ? howto list modes engaged - ? Also need to increase my skills navigating the debugger. Is this still the reference http://georgejahad.com/clojure/swank-cdt.html to use - ? Can you use Emacs / Slime / CDT (debugging) with Ruby / Rails As a VIM'er, I'm trying to do the following using emacs navigation, but seem to have missed the levers to pull. I'm using a vim navigation pluginhttp://gitorious.org/evil/pages/Home, which helps a lot. - ? set line numbers - ? go to line 'n' - ? how to jump to matching parentheses - ? move down a chunk like in vim - ? yank 'n' lines - emacs yank puts back some 'killed' text ; HOWTO copy Thanks Tim -- 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
Re: Calling a Java call with array from Clojure
Varargs are a fiction of javac, and do not exist at the bytecode level. In real life, this method takes two args, a String and a String[]. Use into-array to create a string array, and pass that as the second arg. On Sep 13, 6:21 pm, ron peterson peterson.ron...@gmail.com wrote: I have a following API call that I need to make from Clojure: class A doSomething(java.lang.String arg1, String... args) so I tried (def a (new A)) ;this works (.doSomething a abc efg hij) ;this doesn't work giving me no matching method found: doSomething for class A -- 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
Re: Rounding the edges of an Emacs beginner
On Tue, Sep 13, 2011 at 7:13 PM, Timothy Washington twash...@gmail.com wrote: ? getting an error when I i) M-x slime-connect or ii) send a form (+1 1) to swank ; this is after i) a lein swank then ii) in another window emacs M-x connect . ** Evaluating Slime forms seems to work after that Have you tried M-x clojure-jack-in? It will ensure that the correct version of slime is loaded. I don't know what's causing your error, but it could be a slime version mismatch. ? howto do Code completion (clojure, and elisp) The emacs-starter-kit binds M-/ to hippie-expand which hooks into slime inside the repl and clojure-mode buffers. It can be set up manually too, but I couldn't tell you how off the top of my head. In the repl just regular TAB works. ? close a slime-repl connection M-x slime-disconnect ? howto list modes engaged C-h m ? Also need to increase my skills navigating the debugger. Is this still the reference to use I think that's right. ? Can you use Emacs / Slime / CDT (debugging) with Ruby / Rails Ruby uses inf-ruby, which is pretty primitive compared to slime. But it's better than raw irb. As a VIM'er, I'm trying to do the following using emacs navigation, but seem to have missed the levers to pull. I'm using a vim navigation plugin, which helps a lot. ? set line numbers I think there's something called linum-mode for that, but I've never used it. ? go to line 'n' M-g M-g ? how to jump to matching parentheses C-M-b/f ? move down a chunk like in vim Not sure what this means, but C-h t gives you most of the navigation commands. ? yank 'n' lines - emacs yank puts back some 'killed' text ; HOWTO copy M-w Thanks Sure. -Phil -- 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
Re: Rounding the edges of an Emacs beginner
Oh nice one mate. Yes, I tried M-x clojure-jack-in. The main feature I'm looking for is to be able to run a jetty / compojure stack, then connect / jack-in to that. But now that I think about it, I can probably just pass a run jetty / ring form to swank to start it :) Let me know if I'm on the right path. Wrt completion, I was looking at Sam Aaron's setuphttp://vimeo.com/25190186, and thought that would be particularly useful. But your tip did get me a big part of the way. Don't want to be lost in a black box http://vimeo.com/21412267 :) Thanks a bunch Tim On Tue, Sep 13, 2011 at 10:42 PM, Phil Hagelberg p...@hagelb.org wrote: On Tue, Sep 13, 2011 at 7:13 PM, Timothy Washington twash...@gmail.com wrote: ? getting an error when I i) M-x slime-connect or ii) send a form (+1 1) to swank ; this is after i) a lein swank then ii) in another window emacs M-x connect . ** Evaluating Slime forms seems to work after that Have you tried M-x clojure-jack-in? It will ensure that the correct version of slime is loaded. I don't know what's causing your error, but it could be a slime version mismatch. ? howto do Code completion (clojure, and elisp) The emacs-starter-kit binds M-/ to hippie-expand which hooks into slime inside the repl and clojure-mode buffers. It can be set up manually too, but I couldn't tell you how off the top of my head. In the repl just regular TAB works. ? close a slime-repl connection M-x slime-disconnect ? howto list modes engaged C-h m ? Also need to increase my skills navigating the debugger. Is this still the reference to use I think that's right. ? Can you use Emacs / Slime / CDT (debugging) with Ruby / Rails Ruby uses inf-ruby, which is pretty primitive compared to slime. But it's better than raw irb. As a VIM'er, I'm trying to do the following using emacs navigation, but seem to have missed the levers to pull. I'm using a vim navigation plugin, which helps a lot. ? set line numbers I think there's something called linum-mode for that, but I've never used it. ? go to line 'n' M-g M-g ? how to jump to matching parentheses C-M-b/f ? move down a chunk like in vim Not sure what this means, but C-h t gives you most of the navigation commands. ? yank 'n' lines - emacs yank puts back some 'killed' text ; HOWTO copy M-w Thanks Sure. -Phil -- 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 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
Re: Calling a Java call with array from Clojure
Thank you very much. Your suggestions worked: (.doSomething a abc (into-array String [efg hij])) On Sep 13, 7:33 pm, Alan Malloy a...@malloys.org wrote: Varargs are a fiction of javac, and do not exist at the bytecode level. In real life, this method takes two args, a String and a String[]. Use into-array to create a string array, and pass that as the second arg. On Sep 13, 6:21 pm, ron peterson peterson.ron...@gmail.com wrote: I have a following API call that I need to make from Clojure: class A doSomething(java.lang.String arg1, String... args) so I tried (def a (new A)) ;this works (.doSomething a abc efg hij) ;this doesn't work giving me no matching method found: doSomething for class A -- 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
run clj file get user/counter-app error?
I am running a swing tutorial clojure program file and when I run the result is ++ user= (load-file c:/clojure-1.2.1/counter-app.clj) #'user/counter-app user= ++ What does this line mean? #'user/counter-app The name of my file is counter-app.clj program listing on win Vista IS -- (import '(javax.swing JLabel JButton JPanel JFrame)) (defn counter-app [] (let [counter (atom 0) label (JLabel. Counter: 0) button (doto (JButton. Add 1) (on-action evnt ;; evnt is not used (.setText label (str Counter: (swap! counter inc) panel (doto (JPanel.) (.setOpaque true) (.add label) (.add button))] (doto (JFrame. Counter App) (.setContentPane panel) (.setSize 300 100) (.setVisible true -- 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
Re: Problem with insert-values (clojure.contrib.sql)
Sean, thx for the hint. But how do I use the connectionpool now from clojure.java.jdbc? (defn db-update-or-insert Updates or inserts a fruit [record] (sql/with-connection db (sql/update-or-insert-values :fruit [name=? (:name record)] record))) In my scenario, I just have one technical user that writes some data into a table. I just want to keep tha connection open all the time. Thx. - Finn -- 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
Re: Problem with insert-values (clojure.contrib.sql)
On Tue, Sep 13, 2011 at 10:43 PM, finbeu info_pe...@t-online.de wrote: But how do I use the connectionpool now from clojure.java.jdbc? Did you read that documentation? Does it not provide enough information? Let me know so I can make it better. -- Sean A Corfield -- (904) 302-SEAN An Architect's View -- http://corfield.org/ World Singles, LLC. -- http://worldsingles.com/ Railo Technologies, Inc. -- http://www.getrailo.com/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) -- 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
