Does anyone have suggestions on the best way to store Clojure objects
to a file and later read them back in?
The obvious option would be to use the build-in printer and reader.
One limitation here, which I'm OK with for now, is that this doesn't
work for arbitrary serializable objects (which might be a nice
addition). However, this also doesn't seem to work for struct-maps:
user> (defstruct s :key)
#'user/s
user> (binding [*print-dup* true] (print-str (struct s)))
"#=(clojure.lang.PersistentStructMap/create {:key nil})"
user> (read-string *1)
; Exception
If I get rid of the *print-dup* then I get an ordinary map back here,
which is fine with me, but then other things fail to print/read back
correctly. Is this a bug?
The other option would be to use an ObjectOutputStream, which works
for most of the core classes, and plays nice with random embedded
Serializable Java objects. However, Keywords are not yet
serializable so anything with a Keyword in it fails with this
approach.
Finally, has anyone tried printing something with closures in it, and
then reading it back in another JVM instance? I haven't tried yet,
but from this:
user> (binding [*print-dup* true] (print-str (fn [x] (+ 1 1))))
"#=(user$eval__29258$fn__29260. )"
I gather it might be possible if you're using AOT compilation, but not
with ordinary compilation. Does this sound right?
Thanks,
Jason
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