I'm working on some complex analysis where it takes about twelve hours to construct the model to be analysed. Once it's constructed I'm doing various interactive things to explore it, but I can't currently persist it in a form in which it can be read back in, so that when the REPL session ends it is lost and I need to run the construction process again.
When I was creating the system I had thought, airily, 'well, Clojure is Lisp so all I need to do is spit the structure out to a file and slurp it back in again'. Unfortunately, of course, Clojure is only mostly Lisp. My problem is clj-time objects, both date-time and interval. These are essentially Joda time objects, and when they are printed, what you get is a string representation of an object reference. When the reader reads it back, what you have is a string: user=> (def foo (tc/now)) #'user/foo user=> (spit "/tmp/saved-time" (with-out-str (pr foo))) nil user=> (def bar (slurp "/tmp/saved-time")) #'user/bar user=> (= foo bar) false user=> (type foo) org.joda.time.DateTime user=> (type bar) java.lang.String So, my question: in this particular case, what is the simplest means of writing my data structures (which, apart from the clj-time objects, comprises deeply nested maps of keywords, strings and numbers - all things which the Clojure reader and writer can cope with) to disk in a form in which they can subsequently be read back? There are two obvious solutions: one is to have a function which walks the data structure and returns an equivalent data structure in which each clj-time object is replaced by a function invocation which when invoked creates an equivalent clj-time object; the other is to use Java serialisation to serialise the whole structure as in the answer to this stackoverflow question <http://stackoverflow.com/questions/7701634/efficient-binary-serialization-for-clojure-java> . Which of these would people go for? Or is there some other solution I have not thought of? -- 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.
