I just put together some example code to demonstrate "hot updates" with Clojure.
http://paste.lisp.org/display/86576 It allows you to connect to a REPL via port 12345 and dynamically update things as necessary. To address the issue of updating multiple definitions at once, you'd do something like the following (after modifying main.clj): tra...@travis-desktop:~$ nc localhost 12345 clojure.core=> (require 'main :reload) Right now the main thread simply prints message in a loop, but I've tried changing main.clj to modify both the print-hello function and value of message, and it worked great. You can also connect to the repl and do something like the following, but it doesn't provide the same safety as the seemingly atomic require function does. clojure.core=> (ns main) nil main=> (def message "hola") #'main/message -Travis On Sep 4, 4:22 am, Krukow <karl.kru...@gmail.com> wrote: > I was thinking about the capability of changing production systems on > the fly. E.g. by having an accessible repl in a running production > system. > > If you have a bug in a function, you can fix it by re-def'ing it - > that is great. However, suppose you want to do a system upgrade where > you want to change several things. Now you could just re-def each var > one at a time, but this might produce an inconsistent program in the > interval where you have re-def'ed some but not all vars. > > This first thing you would want is sort-of a atomic update of all > vars, similarly to what is possible with refs. Is this possible > somehow? If not are there any techniques or best practices for these > "system upgrades"? > > /Karl --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
