Ernest Friedman-Hill wrote: "if the function
"insert-rules-and-templates-using-batch" were a deffunction, it would be
undefined"
The insert-rules-and-templates-using-batch is a clp file containing
templates, rules, queries, deffuctions (why not), everything that i need
to have in my knowledge system. I inserted using the batch function
(seems pretty clear this lines to me).
Ernest Friedman-Hill wrote: "Also, it seems odd that you're running the
engine with run-until-halt before adding your facts on the next line;
normally you'd want to do that in the other order."
Not in this case Ernest, my facts are not coming from the program but
from external source, and the idea is as new data arrives (shadow
facts), start to reason about it (it like a pooling process, when
something arrives i dispatch it to the rule-based system). New facts are
constantly arrived to the program, so i prefer to load everything before
i start the process of subscribing the program input.
Unfortunately i cannot send you the code, but i can explain better.
-> when i use (clear) the rule based engine gets clean of every fact,
rules, etc, which is ok;
-> then i insert the templates and rules, using the batch call, and i
can see that everything gets loaded in the system (again ok);
->the problem comes in the agenda, i was expecting when i do
(run-until-halt) the system will start to reason about the facts (which
are inserted parallel, but - i checked - are correctly inserted), but
instead nothing happens. It seems that the (run-until-halt) as no
effect. The agenda is empty, and no rule is active.
Other important note is that when i don't use clear, and just start the
system from scratch (batch - reset - and run-until-halt), the rule-based
system works perfectly. The problem arises when i put a clear in the
beginning of the chain process.
My version of jess is 7.1p2, i was working with the 7.0 but i changed on
hope to solve this problem. Still remains.
Regards,
Joao
On 18-08-2009 15:05, Ernest Friedman-Hill wrote:
Based just on this pseudocode, the two things I can say is that after
the call to (clear), if the function
"insert-rules-and-templates-using-batch" were a deffunction, it would
be undefined; same for "start-thread-for-inserting-shadow-facts".
Also, it seems odd that you're running the engine with run-until-halt
before adding your facts on the next line; normally you'd want to do
that in the other order. But as I said, since this isn't real code,
it's hard to say what's wrong. "clear", in general, should return the
Jess engine to its initial state, and everything should continue to
work fine after that (except that everything previously defined is
gone, of course.)
On Aug 18, 2009, at 3:41 AM, Joao Carlos Mourao wrote:
Hello,
I'm trying to implement a method to restart the rule engine by using the
clear command. The idea is before running, clear everything (using
clear), add all the facts available, and run the engine with the command
(run-until-halt). Although, every time i make use of clear command, the
rule engine blocks, and even if i insert new rules or facts, no rule
becomes active, its seems that is blocked. The procedure that i follow
is with two functions, start and stop, like following:
start:
(clear)
(insert-rules-and-templates-using-batch)
(reset)
(run-until-halt)
(start-thread-for-inserting-shadow-facts)
stop:
(halt)
Can anyone tell me what i'm doing wrong?
Thanks in advance,
Joao
------------------------
unclassified
---------------------------------------------------------
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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