Re: reads which modify data

ok, this is what i do without the (pseudo)random part: "lazy evaluation"

for the random part, the problem is how to find a random seed that we
can later find again and use. using same seed is a solution but of
course we dont want that. we are in the middle of a read operation
came from some client at some -truly- random time. so we cant use
executionTime as a seed. we cannot depend on any pre-seeded sequence
since this is a read and there is no guarantee it will occur again in
same order.

am i missing something ?

On Mon, Mar 2, 2009 at 6:38 AM, Klaus Wuestefeld
<[email protected]> wrote:
> Stop thinking in terms of "reads which modify data" and think about it
> as "lazy evaluation", which is perfectly ok. Something like this:
>
>
> Object executeQuery(Date executionTime) {
>
>   synchronized (_system) {
>      if (!isStateUpdatedTo(executionTime))
>         updateStateWithReallyComplexAndPseudoRandomRulesTo(executionTime);
>   }
>
>   return queryStateWhatever();
> }
>
>
> See you, Klaus.
>
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------------------------------------------------------------------------------
Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA
-OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise
-Strategies to boost innovation and cut costs with open source participation
-Receive a $600 discount off the registration fee with the source code: SFAD
http://p.sf.net/sfu/XcvMzF8H
_______________________________________________
To unsubscribe go to the end of this page: http://lists.sourceforge.net/lists/listinfo/prevayler-discussion
_______________________________________________
"Databases in Memoriam" -- http://www.prevayler.org