In another thread, someone just indicated that a closed-over variable
chews up permgen. Is this true?
I had been under the impression that keywords didn't get
garbage-collected, so runtime generation with (keyword foo) ought to
be used sparingly, but that was it.
Perhaps the scenario was something along the lines of
(defn make-generator []
(let [a (atom 0)]
(fn [] (swap! a inc) @a)))
(def my-generator (make-generator))
user=> (my-generator)
1
user=> (my-generator)
2
user=>
In this case, a closed-over atom is referenced by a function that's
bound to a global var, my-generator. This won't be garbage-collected
so long as my-generator isn't un/redef'd. Even so it shouldn't be
permgen, technically speaking; just indirectly referenced by a loaded
class and so ineligible for GC by more "ordinary" criteria.
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