On 21/11/13 13:19, John D. Hume wrote:
If you want to demonstrate STM with the deposit-withdraw-transfer
example, you definitely need a ref for each account.
I'd suggest an atom for the account-num->balance-ref map ("the bank")
and an atom for the account-num-generator, but you say coordination is
necessary for opening and closing accounts. What coordination do you
have in mind?
exactly my point! thank you...
I finally settled to an atom (the entire bank) that holds a map from
string ids to a ref containing the actual customer-account map.
Sorry, by coordination, I meant atoms or refs. It needs to be
synchronous because we may open an account and deposit immediately. am
I not thinking correctly?
also, people complained about me doing this because I'm altering a
single identity:
(defn deposit!
[account amount]
(dosync
(alter account credit amount)))
whereas this is fine:
(defn- transfer1
[amount from to]
(dosync
(alter to credit amount)
(alter from debit amount)))
but I can't have it both ways! if accounts are refs then a simple
deposit or withdraw must happen in a transaction...
Jim
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