with-open <https://clojuredocs.org/clojure.core/with-open> and spit <http://clojuredocs.org/clojure.core/spit> might be useful. You could also rebind *out*. That may be enough to point you in the right direction, but this page <http://clojure-doc.org/articles/cookbooks/files_and_directories.html> and this blog post <http://nakkaya.com/2010/06/15/clojure-io-cookbook/> look like they might be helpful.
On Friday, July 31, 2015 at 7:52:07 AM UTC-5, Marcin Jurczuk wrote: > > Hi all, > > This is my first post here so please be compassionate :) > > I'm evaluating clojure for some of my purposes and I've stuck on task that > I don't know to handle. > I have applicatin that is receiving a lot of data and writing some results > to a file. > However once per hour this output file must be changes so data are in > chunks. > I have working solution with writing to one file but I don't know where to > start code for changeing "this on the fly". > What I need is to avoid open-close cycle with every piece of data to save > since data stream is big.I need only close one file and open another one > (name generated on some rules) where data will be continously written once > per hour. > > I have this app written in golang where there are just two goroutines and > main code retriving data. > Writing goroutine beside data to write channel also have filename channel > and when it receives message here it just close current file and open > another but file handle var (i.e outFile) is always the same. > This file swap is made with mutex arround and other protection so there is > no case when write is made to a closed file. > > There is another timer goroutine that every ~ยง1h just calculate new > filename and sends message to write goroutine. > Works like expected :) > > As a proof of concept I'm trying to rewrite this in clojure. > Summary it's like kind of syslog which have to change destination file > periodically. > > Kind regards to everyone. > > Marcin. > > -- 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.
