Thanks for your reply,Ulrich
I knew that comute would rerun before the commit,but my problem is
that if we allow ref-set ref after commuting,it seems there is no bad
thing would happen.What's the purpose of this limitation except alter
or ref-set have no lasting result?
On Jul 25, 7:01 pm, Moritz Ulrich ulrich.mor...@googlemail.com
wrote:
Read the documentation of commute
carefully:http://richhickey.github.com/clojure/clojure.core-api.html#clojure.co...
commute acts at the end of the current dosync-block, regardless of
when commute was applied inside it. That's the reason why you can't
ref-set it after a commute; the commute isn't done.
On Sun, Jul 25, 2010 at 11:19 AM, dennis killme2...@gmail.com wrote:
Alter or ref-set a ref after commute would throw a
IllegalStateException:Can't set after commute
for example:
user= (def counter (ref 0))
#'user/counter
(dosync (commute counter inc) (ref-set counter 3))
java.lang.IllegalStateException: Can't set after commute
(NO_SOURCE_FILE:0)
I want to know why this should not happen?is it a explanation here? I
can't understand what is the difference with commuting ref after ref-
set or alter.Thanks a lot.
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http://www.google.com/profiles/ulrich.moritz
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