Hi,all
I am new to clojure. Now I hava a problem about read
transcation.
Suppose now I write some code about bank transfer. So this is
the source-account and destination-account
//The code
(def source-account (ref 1000))
(def dest-account (ref 0))
And I have a function to do the account transfer.
//The code
(defn take-money [account num]
(- account num))
(defn despoite [account num]
(+ account num))
(defn transfer-money [num]
(dosync (alter source-account take-money num)
(alter dest-account despoite num)))
And I have a another function to print the source account and dest
acoount information.
//The code
(defn print-info []
(do
(println @source-account)
(println @dest-account)))
Suppose the transfer-money and print-info are run in different
thread. With the current Clojure STM, is it possible that print-info
prints the old source-account information and modified dest-account
information? Do I need to add a dosync to the print-info function? I
read the Programming Clojure. It says do not have side-effect on a
transaction. If I add dosync to the print-info, do I need to use agent
to print the info? Hope somebody can help me.
Thank.
Jack
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