On 22 Apr 2013 20:19, "Timothy Washington" <twash...@gmail.com> wrote:
>
> Before getting into the nitty gritty, is there something obvious I can do
to fix this code? Is alter a blocking call?

You are seeing STM transaction restarts in action

It looks like you are assuming that STM  will serialise your transactions
like, say,  RDBMS transactions,  on a first come first served basis with
subsequent transactions blocked until the current one is complete?

If this is your assumption,  it's not correct I'm afraid.

You must write the body of the dosync  such that it can run multiple times,
each run starting with a different (but consistent)  view of the ref
universe.

Without more nitty gritty it's difficult to know more.  Possibly a queue is
a better fit here? Have you considered using one from java.util.concurrent
?

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