It seems I have an example that shows difference between commute and
alter.
Here it is:
(defn my-inc [x] (dosync (Thread/sleep 1000) (inc x)))
****alter***
(def x (ref 0))
(do
(def fut (future (do (Thread/sleep 300) (dosync (alter x inc))
@x)))
(dosync (println @x)(alter x my-inc)(println @x))
@x)
output:
0
1
2 (it's the in-transaction value)
2 (it's the post-commit value)
***commute***
(def x (ref 0))
(do
(def fut (future (do (Thread/sleep 300) (dosync (alter x inc))
@x)))
(dosync (println @x)(commute x my-inc)(println @x))
@x)
output:
0
1 (it's the in-transaction value)
2(it's the post-commit value)
So this example demonstrate difference between commute and alter.
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