On Feb 9, 2011, at 2:38 PM, Skeptic . wrote:
Hi,
By default, is the firing order deterministic? (i.e. rules fired in
the same order if the same WM is given).
Also, is the order of the facts produced by the next method on a
QueryResult deterministic? (i.e. if I run the same defquery twice on
the same WM, I get the same facts in the same order)
Jess's behavior is in no way *random*, which means it's completely
deterministic. But the order in which these things occur is
*undefined*, which means that it is determined by a number of factors,
some of which are not visible to you. One of those factors is the
number of hash buckets in the various node memories; if a node memory
is rehashed, then the order may change within a given session.
But if you run a single-threaded Jess program twice, starting from
scratch, and execute the exact same sequence of commands both times,
then you will get the exact same results.
---------------------------------------------------------
Ernest Friedman-Hill
Informatics & Decision Sciences, Sandia National Laboratories
PO Box 969, MS 9012, Livermore, CA 94550
http://www.jessrules.com
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