Jess doesn't have much (if any) use for hashing things using
Object.hashCode() without overriding it.
On Feb 10, 2011, at 11:11 AM, Skeptic . wrote:
Is the hashing based on Object.hashcode() or is it custom ?
Because, in practice, Object.hashcode() can be considered *random*.
From: ejfr...@sandia.gov
To: jess-users@sandia.gov
Subject: Re: JESS: Jess determinism
Date: Wed, 9 Feb 2011 20:45:54 -0500
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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Ernest Friedman-Hill
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PO Box 969, MS 9012 ejfr...@sandia.gov
Livermore, CA 94550 http://www.jessrules.com
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