On Jan 9, 2008, at 7:20 PM, Nice Bright wrote:
Hi everybody,
In Jess programming, is it possible to define a time notion (e.g.
12:00) in the definition of a rule such that the rule can be
activated when the current time is 12:00.
Thanks
Nice
The technique you use to do this kind of thing is to keep a
"timestamp" fact in working memory, and update it periodically; then
match that timestamp fact with your rule. When the timestamp
represents a time later than the firing time, you can fire your rule
(which should then delete itself.)
There are lots of different ways you might update the timestamp fact;
Wolfgang Laun's "after/every" Userfunction is one fine way (see
http://herzberg.ca.sandia.gov/jesswiki/view?AfterEveryUserFunction ).
"Mohd. Noor" <[EMAIL PROTECTED]> wrote:
sory, just wonder is they any suggestion?
On Jan 8, 2008 9:51 PM, Mohd. Noor <[EMAIL PROTECTED]> wrote:
Thanks all
The reason I want to use the JESS/rule base is in its flexibilty to
update the attribute as publish/subscribe by using a broker.
What I means is:
I have a collection of resources attributes to be published in
broker e.g. I have a collection of hosts with different number of
CPUs available and this always changes over time- this information
is updated by the monitoring daemon in the particular resource to
the centralised broker. (The resource information will be publish
into the broker as attribute+value e.g. {RESOURCES=HARDWARE
{CPU_AVAIL= 100,MEM_AVAIL=1GB}}) - how to translate this into rules
or something in JESS?
Then I have a collection of user will request for resource, let say
the user want to run a job and GET results within one hour- this
request is send to the broker. BUT the request is not related with
CPU_AVAIL attributes but rather than their own attribute such as
TIME_VALUE. e.g. get me the results within one hour.
So that, the broker will decide in which node the job should be run.
Hope this will give an overview to what I am working on.
Cheers
Mnoor
On Jan 8, 2008 4:31 PM, Jason Morris <[EMAIL PROTECTED]> wrote:
Hi MNoor,
This isn't really a Jess question, but perhaps I can help. The
knowledge domain that you are seeking is called Operations
Research. Here is a wikipedia reference to get you stated: http://
en.wikipedia.org/wiki/Operations_research .
An objective function is what you minimize (in the case of cost) or
maximize (in the case of profit, output, or other positive
objective) -- in other words, you are trying to find the values for
the independent variables in the objective function for which its
value is optimum These inputs are often constrained over some
domains like [0 <= number_of_CPUs <= 1000]. This optimization is
an application of Linear Programming (LP). See http://
en.wikipedia.org/wiki/Linear_programming .
So, Is there a particular reason why you have to use rules to solve
your problem? There is a whole branch of applied mathematics which
is devoted to this exact kind of problem. Also, would you please
send the *exact* wording of the problem you have been given? That
way, I can say for certain whether or not an LP approach would be
better.
Cheers,
Jason
-----------------------------------------------------------
Jason Morris
Morris Technical Solutions LLC
http://www.morris-technical-solutions.com
On Jan 8, 2008 10:55 AM, Mohd. Noor <[EMAIL PROTECTED]> wrote:
Dear all
What is it means by cost or objective function?
one more things.
How I am going to map (using rules) between two different
attributes from users and resources
let say user need to run the job and get results in 1 hour
but the resource available is represented in another attribute,
say, the number of CPU available is 100CPUs
How I am going to translate and map this two different definition/
schema
Regards
mnoor
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Ernest Friedman-Hill
Informatics & Decision Sciences Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
PO Box 969, MS 9012 [EMAIL PROTECTED]
Livermore, CA 94550 http://www.jessrules.com
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