Re: JESS: Question about defquery
I think Lakshmi Vempati wrote: I am using a simple defquery to find a fact and then modify it. For reasons that are too difficult to go into (although we've actually discussed it before on this list) when you get a jess.Fact out of a jess.Token (as you do when you're working with a query result) you should call getIcon() to get the fact's canonical representation (I know, that's a terrible method name) and use the return value instead of the original Fact object. That should solve your problem. - Ernest Friedman-Hill Science and Engineering PSEsPhone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Getting detailed match information
I think Douglas Pearson wrote: For example if I had: (defrule simple-rule (child (id ?x) (name ?name)) (parent (id ?y) (child ?x)) = (printout t Child ?x name ?name crlf) ) and I know fact-3 and fact-7 were matched...how can I tell (programmatically) which fact matched which condition? Well, the facts in a token are in the same order as the patterns they matched. There's no way to explicitly ask for the jess.Pattern that a given fact in a jess.Token matched, although you could probably back it out by getting the jess.Defrule of interest and calling getConditionalElements() to get the root of the (potentially tree-structured) LHS patterns. This is not well-documented, and for good reason: you'll find that the structure changes quite a bit as Jess evolves from version to version. I'd also really like to get partial match information as well...not just when the rule fired and I'm less clear on how to even get started with that since the rule won't be in the agenda. There's no public API for this, but if you've got a Jess license, you can poke around in the source. See the implementation of the (matches) command (which displays partial matches.) The key thing it does is call getNodes() on the given Defrule object, which returns a List of jess.Node objects. These are the Rete network nodes. You can root through this list and find the Node2 objects (the join nodes) and then look at their alpha memories. - Ernest Friedman-Hill Science and Engineering PSEsPhone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: jess.Console question
I think Maxim Tretyak wrote: Hi Can I get advantages of jess.Console by such a way: Jess (new jess.Console Hi (engine)) External-Address:jess.Console Console is appearing, but connand line input is transmitted directly to output text area, without interaction with Rete. Very clever! Just creating a Console doesn't do it though, there has to be a thread running the Console.execute() method (the read-eval-print loop). You could say Jess (bind ?c (new jess.Console Hi (engine))) Jess (?c execute (create$)) The console would then work, but the original command line wouldn't anymore; and there's no way (no easy way, anyway) to get it back. The Console class has to reroute all of the Rete objects standard I/O routers to connect it to the GUI; in the process, it gets disconnected from standard I/O. - Ernest Friedman-Hill Science and Engineering PSEsPhone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Passing an instance of Rete to java
I think Greg Biegel wrote: [Charset iso-8859-1 unsupported, filtering to ASCII...] Hi, Is there a way to pass a reference to the current instance of the rule engine from Jess, to a Java object. I tried using the 'this' keyword, but doesn't seem to work. So basically, I would like to construct a Java object from within Jess, but be able to call back to Jess from the object. The (engine) function returns the Rete object that the invoking Jess code is running in; so (bind ?o (new MyObject)) (?o mySetJessEngineMethod (engine)) would create an instance of MyObject, and call the imaginary mySetJessEngineMethod method, passing a reference to the Rete object as an argument. - Ernest Friedman-Hill Science and Engineering PSEsPhone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
JESS: Announcing Jess 6.1p7
Hi Folks, I am pleased to announce that version 6.1p7 of Jess, the rule engine for the Java platform, is now available for download at the usual place: http://herzberg.ca.sandia.gov/download.shtml This is a bug fix release with some improved performance characteristics. From the change log: Fixed deadlock problem (thanks Paul Kaib). Better performance with huge numbers of templates (thanks Travis Nelson.) Fix NPE when parsing empty (not) patterns. Fix PrettyPrinter bug with (not) and pattern bindings. As usual, question, comments, or concerns welcome at [EMAIL PROTECTED] or to the mailing list at [EMAIL PROTECTED] - Ernest Friedman-Hill Science and Engineering PSEsPhone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Pausing the execution cycle without returning
I think Steffen Luypaert wrote: The basic trick is this: From one rule, set up the GUI to ask a question, then call ((engine) waitForActivations), which pauses the (run) thread until a new rule is activated. The problem is that waitForActivations will still fire the activations left on the agenda, and then wait for new activations to execute them. Only in the focus module, but yes, you're right. You could, instead, just use (bind ?s ((engine) getActivationSemaphore)) (synchronized (?s) (?s wait)) which won't allow any more rules to fire at all until a new activation comes in. - Ernest Friedman-Hill Science and Engineering PSEsPhone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Combining the logical CE and backward chaining
I think Steffen Luypaert wrote: Hi all, No backward chaining will occur for patterns inside a conditional element. I was wondering that this will change in a future version of Jess, especially for the logical conditional element. This is basically an oversight in the rule compiler; nobody's ever pointed this out before. The problem is that, because everything in Jess is driven by pattern-matching, for a pattern to trigger backward chaining, there has to be a preceding pattern; i.e., for Jess to notice that there's no fact that satisfies pattern 1 of a rule, there has to be a pattern 0 that is satisfied. Imagine that the deftemplate foo is backwards chaining reactive. Then if you write a rule (defrule bar (foo (a 1)) = ) Jess will rewrite it like this to provide that needed preceding pattern: (defrule bar (initial-fact) (foo (a 1)) = ) (you can confirm this with ppdefrule.) The problem you're seeing is that a rule like (defrule foo (logical (foo (a 1))) = ) isn't being rewritten automatically. No worries, though -- you can actually do it yourself: (defrule foo (logical (initial-fact) (foo (a 1))) = ) You'll find that if you do this, logical patterns will indeed trigger backward chaining. I'll log a bug on this and we'll get it fixed. Will it ever be possible to make Jess automatically retract the need-fact, whenever the needed fact is computed? When Jess's backward chaining feature was first added, that's what it did, actually, but we changed it because it led to infinite loops. You can of course retract the need-X facts on the RHS of your rules that satisfy them, and deal with the loops some other way. - Ernest Friedman-Hill Science and Engineering PSEsPhone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Problem updating shadow fact data
I think Michael Knapik wrote: ;;(call event setConditionCodeId ) Variables always have a ? in their name: (call ?event setConditionCodeId ) (modify 2 (conditionCodeID )) Slot names are case-sensitive: (modify 2 (conditionCodeId )) - Ernest Friedman-Hill Science and Engineering PSEsPhone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Problem updating shadow fact data
I think Michael Knapik wrote: (defrule report-subject-and-event-status ?s - (subject (subjectId ?sId) (caseStatusId ?csId)) ?e - (event (eventId ?eId) (conditionCodeId ?ccId)(eventDescriptor ?evtDescriptor)) = (modify ?e (conditionCodeId )) (printout t * Event ?eId has a condition code: ?ccID crlf) produces Event 100017 has a condition code: 1008 which is the original value. Imagine a JavaBean class Foo with a property X. Now, what does this print? Foo f = new Foo(); f.setX(23); int x = f.getX(); f.setX(37); System.out.println(x); It prints 23, right? Even though the X property of the Foo bean is 37, because you read the property, changed it, and then printed the value you read earlier. That's exactly what you're doing in your Jess code. The variable ?eId gets bound on the rule LHS; then you modify the value of that property in the bean; then you print the value of the variable which, not surprisingly, still has the same value. If you want to see the new value, you need to read it back from the object. - Ernest Friedman-Hill Science and Engineering PSEsPhone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: JessAgentTab
I think Chintan Shah wrote: [Charset iso-8859-1 unsupported, filtering to ASCII...] Can you please provide the fully qualified server name in the url. http://www-i4 does not work for anybody outside your DNS. It the same as his email; http://www-i4.informatik.rwth-aachen.de/agentcities/main/tools/JessAgentTab/doc/jat.html - Ernest Friedman-Hill Science and Engineering PSEsPhone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Comparing string
Jess doesn't have an explicit else-if feature; if you put an if into the else of another if, then that second if is a separate function call, so it needs its own parentheses. If I may, I will point out a few other things here: You don't need to spell out the names of any classes in java.lang, as it's implicitly imported, just as in Java. Second, you don't actually need to construct Strings at all; you can call Java String methods on Jess strings. Third, you can (and should) always omit call when calling a Java instance method; it's really only needed when you're invoking a static method. So you could clean your function up like this: (deffunction compare-comptment-function(?s1 ?s2) (if (eq ?s1 ?s2) then (return FFF) else (if (?s1 contains ?s2) then (printout t COMES 1 crlf) (return ?s1) else (if (?s2 contains ?s1) then (printout t COMES 2 crlf) (return ?s2) else (printout t COMES 3 crlf) (return (str-cat ?s1 , ?s2)) I think Amit Jain wrote: [Charset iso-8859-1 unsupported, filtering to ASCII...] Hi all I'm trying to compare two strings (deffunction compare-comptment-function(?s1 ?s2) (bind ?str-buff1 (new java.lang.String ?s1)) (bind ?str-buff2 (new java.lang.String ?s2)) (if (eq ?s1 ?s2) then (return FFF) else if (call ?str-buff1 contains ?str-buff2) then (printout t COMES 1 crlf) (return ?s1) else if (call ?str-buff2 contains ?str-buff1) then (printout t COMES 2 crlf) (return ?s2) else (printout t COMES 3 crlf) (return (str-cat ?s1 , ?s2 SO when i call (compare-comptment-function CSEE CS) it should return COMES 1 CSEE (compare-comptment-function CSE CSEEE) it should return COMES 2 CSEEE and (compare-comptment-function AE CSE) it should return COMES 3 AE,CSE but it keeps going into first elseif loop in all the cases. please tell me what i'm doing wrong. thanks for the help. -amit - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Pattern Binding for CE
I think Krasnigor, Scott L (N-AST) wrote: I have an ID slot defined for the Bean object used to define the facts but can't seem to figure out how to get the fact that triggered the rule so I can modify it for this particular case (all my other rules allow pattern binding). I formatted your rule to make it easier to understand. (defrule doctrine-untripped ;; sets qualDoctrine to FALSE if any check flags are FALSE ?docFact - (or (and (testTrkClass (qualRng FALSE)) (testTrkClass (qualDoctrine ~FALSE))) (and (testTrkClass (qualBrg FALSE)) (testTrkClass (qualDoctrine ~FALSE = (modify ?docFact (qualDoctrine FALSE))) So the or has two branches, each of which is an and. Those ands, in turn, each match two facts (the two could, in fact, be the same one, or they could be different.) Based on your comment, and on your problem description, my guess is that you didn't realize that, and you intend the and to simply group together multiple tests on the same fact. It doesn't work that way: you should write all the tests for a single fact in a single pattern, or else the rule can match bits and pieces from multiple facts. So really I think you mean (defrule doctrine-untripped ;; sets qualDoctrine to FALSE if any check flags are FALSE ?docFact - (or (testTrkClass (qualRng FALSE) (qualDoctrine ~FALSE)) (testTrkClass (qualBrg FALSE) (qualDoctrine ~FALSE)) = (modify ?docFact (qualDoctrine FALSE))) Because each branch of the or matches a single branch, the pattern binding is OK. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: How to write constraint for shadow fact list/set properties ?
I think robert fields wrote:
Classes are loaded from java by
Jesp j = new Jesp(new StringReader((defclass {Role,
...} package.{Role,})), aEngine);
j.parse(false);
The Rete class has a defclass method which would be much more
convenient to use! Barring that, it also has an executeCommand
method that takes a String of Jess code and runs it -- basically the
equivalent of the above, only shorter and faster.
I have no problem in writing constraints with simple
attributes. It is List/Set/Array properties I am
having trouble with.
Jess has no special way of treating Collections; the only thing you
need to do is call the collection's methods. For example, if a class Foo
has a property aSet which is (predictable enough) a Set, and you want
to match a Foo object if aSet contains bar, then you might write a
pattern like this:
(Foo (aSet ?s:(?s contains bar)))
Jess *does* treat arrays specially; arrays are mapped to Jess
lists. You can use multifield variables to match sections of
lists. As it turns out, this is quite badly documented in the current
manual, although that should be remedied soon. In the meantime, you
can look at the section on multifields on page 103 of the book Jess
in Action, or look at how they're used in the stack.clp example in
the Jess distribution.
-
Ernest Friedman-Hill
Advanced Software Research Phone: (925) 294-2154
Sandia National LabsFAX: (925) 294-2234
PO Box 969, MS 9012 [EMAIL PROTECTED]
Livermore, CA 94550 http://herzberg.ca.sandia.gov
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Re: JESS: Facts and modules
I think Henrique Lopes Cardoso wrote: So, if I understood correctly, facts can only be asserted in the module where their templates are defined Yes. Therefore, if I have a template defined in MAIN, I cannot create a fact based on that template in another module. Right. Another observation: using a module name at a deftemplate definition (e.g. (deftemplate m::the-facts ...)), if that module is the current module, is irrelevant. Redundant, yes. The effect will be the same without it. A fact and a template are related in exactly the same way that a Java object and a Java class are related. In this scheme, a module is like a Java package. Every object must belong to a class; every class must be in some package. Every fact must belong to a template; every template must be in some module. So facts don't belong to modules any more than Java objects belong to packages, right? You can't create a java.lang.String in the java.util package; it just doesn't make sense, in the same way that you can't create an X::foo fact in the Y module. You can use Strings in code in the java.util package, or you can use X::foo facts in a rule in the Y module. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Matching a static variable
Hi Erich,
First, let me mention that I'm happy to see someone using the
brand-new static imports feature -- the thing that lets you use
(CarClass.MINI) as a constant.
Second, your code looks fine except that the defclass defines a short
template tag RentalCarReservation, but the rules are using the long
com form; I'll assume this is a transcription error, because the
rules won't compile unless you're consistent here.
Third, let me mention, as I often do on this list (I really need to
make this point more strongly in the manual) that direct matching
should always be preferred to function calls, and anything else should
be preferred to the test CE; this is not only a style issue but a
performance issue. Although your rules are both correct, it's better
style and will perform better to write them as
(defrule car_class_is_compact
(RentalCarReservation (carClass ~=(CarClass.COMPACT)))
=
(printout t Car Class is not COMPACT crlf)
)
(defrule one_hundred_miles
(RentalCarReservation (freeMiles 100))
=
(printout t 100 free miles crlf)
)
Finally, I can't say for sure what the problem is, but I'll guess
(since you've mentioned equals()) that you've written a class whose
hashCode() is not consistent with its equals() method (perhaps simply
by not overriding hashCode().) Jess is rather sensitive to this
error, as are many of the java.util container classes.
I think erich.oliphant wrote:
[Charset iso-8859-1 unsupported, filtering to ASCII...]
Hi I am a new jess user and I'm running into a problem trying to match an java
object value in a rule. Here are 2 rules and their setup, the first is the
one with the problem. The other I added to verify that it would match on a
primitive type and it seems to work fine:
(import CarClass)
(defclass RentalCarReservation
RentalCarReservation nil)
(bind ?tmpRentalCarRes (new RentalCarReservation))
(definstance RentalCarReservation
?tmpRentalCarRes
static)
(call ?tmpRentalCarRes setCarClass (CarClass.MINI))
(call ?tmpRentalCarRes setFreeMiles 100)
(reset)
(facts)
(defrule car_class_is_compact
(com.ngc.dts.domain.reservation.car.RentalCarReservation (carClass ?x))
(test (neq ?x (CarClass.COMPACT)))
=
(printout t Car Class is not COMPACT crlf)
)
(defrule one_hundred_miles
(com.ngc.dts.domain.reservation.car.RentalCarReservation (freeMiles ?x))
(test (eq ?x 100))
=
(printout t 100 free miles crlf)
)
--
CarClass is an enum type i.e.:
class CarClass
{
...
static public MINI = new CarClass(MINI);
...
}
--
equals() has been overridden in CarClass as well. The one_hundred_miles rule
works fine so I know there's a specific problem using the object. Any help
would be greatly appreciated.
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-
Ernest Friedman-Hill
Advanced Software Research Phone: (925) 294-2154
Sandia National LabsFAX: (925) 294-2234
PO Box 969, MS 9012 [EMAIL PROTECTED]
Livermore, CA 94550 http://herzberg.ca.sandia.gov
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Re: JESS: Jess DE JSR-94
I think erich.oliphant wrote: Hi, We are using the JSR-94 interface but would like to use JessDE for debugging,etc. Will jessDE support the XML formatted files required by the JSR-94 interface ? There are two JSR94 drivers. There's the reference implementation that comes with the JSR94 package from Sun. It only supports a weird XML rule format in which Jess language code is wrapped with XML tags. This driver works with Jess 6 and I do not encourage anyone to use it. It was just a proof-of-concept. There also the new JSR94 driver that is packaged with recent versions of Jess 7. It supports JessML *and* Jess language code. In fact, the example given in the manual show it being used with Jess language code, not JessML. If you're using the JessDE, then you'll need to use this new Jess 7 driver. So tell me where you got the idea that JessML was required if you were using javax.rules? I'd like to change it if I can to make it clear that it's not. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Problem with definstance
I think David Firmin wrote: I'm trying to create shadow facts that subclass a deftemplate that's already been added to the Rete. When I try and add the java bean using definstance I get a ClassCastException as follows: java.lang.ClassCastException at jess.DefinstanceList.createNewShadowFact(DefinstanceList.java:206) at jess.DefinstanceList.definstance(DefinstanceList.java:275) Jess is assuming that the given class looks like a subclass of the deftemplate -- i.e., if the template has slots foo and bar, then the class had better have getFoo() and getBar() methods. It can have additional properties as well, of course, as befits a subclass. In any case, this is a lousy error message -- Jess should explicitly detect and report this problem. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Central data storage for multiople Jess instances
I think Bogdan Werth wrote: [Charset iso-8859-1 unsupported, filtering to ASCII...] Hello everybody, I working on the model from the field of social simulation. I am using RePast and Jess to make my agents think in a declarative way. At the moment I have a separate Jess instance for every agent (300 agents = 300 Rete instances). Don't do that. Just use one Jess instance. Facts that are specific to one agent should include an agent-specific identifier, and rules that operate on these facts should take care to match them as needed to keep the various agent's logical processes separate. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: New to JESS
I think nikita berdikov wrote: [Charset iso-8859-1 unsupported, filtering to ASCII...] Hello, I'm new to Eclipse and JESS, so can anyone tell me how to start working with JESS in Eclipse 3.1. What variables should i set? I did everything that is written in Using the JessDE, but something is wrong. What is wrong, exactly -- i.e., what did you do, what happened, and what did you expect to happen instead? If you install it properly, files named *.clp will be opened in the JessDE Editor; otherwise, nothing much should be different. And please, show me an example of JESS code in Eclipse. You can open any *.clp file in the JessDE editor; you can type in any code in the manual, or open any *.clp files in the examples directory. Thanks in advance. __ Yahoo! Music Unlimited Access over 1 million songs. Try it free. http://music.yahoo.com/unlimited/ To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED] - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: So lame, and so sorry - disregard last post
I think Matthew Hutchinson wrote:
So it's not a complete waste, is the following line still the reccomended
way of loading rules from Java?
engine.executeCommand((batch jess_test.clp));
In Jess 7, there's a Rete.batch() method you can use instead;
otherwise, what you've shown works fine. Another alternative is
Reader data = ... // Open file, or whatever
try {
Jesp jesp = new Jesp(data, engine);
jesp.parse(false);
} finally {
data.close();
}
-
Ernest Friedman-Hill
Advanced Software Research Phone: (925) 294-2154
Sandia National LabsFAX: (925) 294-2234
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Re: JESS: The JessTab PAL-integration functions are not available
I think Eunice Palmeira wrote: [Charset iso-8859-1 unsupported, filtering to ASCII...] Hello, I have a problem when i try run Jess with Protigi: JessTab: Note that the PAL engine is not currently installed in Protege. (The JessTab PAL-integration functions are not available.) Well, presumably whatever the PAL engine is needs to be installed. This is not a Jess thing -- it must be a Protege thing. Protege questions tend not to get answered on this list. You should try asking this on a Protege mailing list or forum. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: For-loop bug
You're right -- that's not the correct behavior. Thanks for the report. I think Yura wrote: [Charset koi8-r unsupported, filtering to ASCII...] Hi I think there is a bug in the 'for'-loop implementation. The following code returns '1' (incorrect): (bind ?x 1) (for (bind ?i 1) ( ?i 2) (++ ?i) (bind ?x (float ?x)) (printout t ?x == ?x crlf) ) ?x When I comment out the 'for'-block the expression evaluates to '1.0' (correct). I'm using 70b3. Yuri - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: New to JESS
In the first screenshot, I see an editor window named awtdraw.clp, but I don't see a file by this name in the navigator view; my guess, then, is that you've used the Eclipse File | Open... menu to try to open a file not in your workspace. This doesn't work. You can only edit .clp files that are actually part of an Eclipse project. We've covered this before on this mailing list, but I'm surprised to see it's not mentioned in the manual anywhere. We hope to have this working by the final release of Jess 7. I think nikita berdikov wrote: [Charset iso-8859-1 unsupported, filtering to ASCII...] I have unzipped all plugins in plugin Eclipse directory and yes, i have created a java project. When i try to open *.clp file nothing is happening, see Attach. Also there is my build path (In Attach) What do i do wrong? Thanks in advance --- Matthew Hutchinson [EMAIL PROTECTED] wrote: Hi, having just started using Eclipse myself, I would suggest: - making sure you unzipped all the correct plugins into the correct directory - make sure you create a new *java* project in eclipse, not any other type cheers, Matt On 10/10/05, nikita berdikov [EMAIL PROTECTED] wrote: Hello, I'm new to Eclipse and JESS, so can anyone tell me how to start working with JESS in Eclipse 3.1. What variables should i set? I did everything that is written in Using the JessDE, but something is wrong. And please, show me an example of JESS code in Eclipse. Thanks in advance. __ Yahoo! Music Unlimited Access over 1 million songs. Try it free. http://music.yahoo.com/unlimited/ To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED] __ Yahoo! Music Unlimited Access over 1 million songs. Try it free. http://music.yahoo.com/unlimited/ Content-Description: 263436701-error.PNG [image/x-png is not supported, skipping...] Content-Description: 1585163811-buildPath.PNG [image/x-png is not supported, skipping...] - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: JessDE buggy
I think Jim Goodwin wrote: [Charset iso-8859-1 unsupported, filtering to ASCII...] Are you interested in bug reports? Where do I send them? Very interested. You can send them to this list or directly to me at [EMAIL PROTECTED] Is further work on the JessDE active right now? Absolutely. Are there any relevant system requirements? I am using WinXP, Eclipse 3.1.0, java 1.5.0_04, and an evaluation copy of Jess 7.0b3. Development is done on dual-processor Linux machines, and so far it's been with Eclipse 3.0, not 3.1. We also run Eclipse with JDK 1.4, not 1.5, and it's possible that this matters too. The next release should require Eclipse 3.1. In any case, the behavior of the debugger may depends on how fairly multiple processes are scheduled and how TCP packets are delivered through loopback, so we definitely need to do significant testing on the standard single-processor Windows box -- and thus your feedback is very important. My plugin-details show 4 items for Jess, all at version 7.0.0. That should be the most current stuff, right? Jessgov.sandia.jess Jess Debuggergov.sandia.jess.debug Jess Editor Plugingov.sandia.jess.editor Jess Rete Network Viewergov.sandia.jess.reteview Yes. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Using not and and
I think Dusan Sormaz wrote: [Charset iso-8859-1 unsupported, filtering to ASCII...] I was able to run it in 7.0a6. I am curious, what is the interpretation of and in this example? Is it AND of 4 items? or only 2? 2. It means that there's not a (bar ?x) fact where ?x is the fact (a b c). - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Using not and and
Hmmm, OK, I see. This is a known issue which has (as another poster pointed out) been dealt with in Jess 7. In Jess 6, the workaround is to reverse the order of these patterns: (not (and ?b - (a b c) (foo (bar ?b)) ) ) I think Henrique Lopes Cardoso wrote: [Charset iso-8859-1 unsupported, filtering to ASCII...] Again, I get a NullPointerException just with the code I've shown: (deftemplate foo (slot bar)) (defrule r1 (not (and (foo (bar ?b)) ?b - (a b c) ) ) = (printout t r1 fired crlf) ) I am using Jess Version 6.1p8. Henrique - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: jess
I think =?iso-8859-1?Q?=5BEXTERN=5D_Manuel_Kollmu=DF?= wrote: [Charset iso-8859-1 unsupported, filtering to ASCII...] hi is it possible to read out informations from a *.dll and to handle the return value (string)? Sure, in the same way you'd do it from any Java program: you wrap the DLL using JNI. Then you can call those native methods using Jess. You can learn about JNI here: http://java.sun.com/docs/books/tutorial/native1.1/index.html - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: TextArea Buffer Size
I think Semmel, Glenn S wrote: [Charset iso-8859-1 unsupported, filtering to ASCII...] Hello. Under Jess 7.0a4, the TextAreaWriter class has the following attribute: private static final int MAXSIZE = 3 In a future release, can this attribute be changed to be either a user configurable or made public? We deliver our product with a Jess Console Panel that allows users to query the state of the engine. However, the users complain about the size of the buffered text (3 characters ~ 120 lines). Too much information scrolls out of the text area (i.e. even with the scroll bar, ~120 lines is not enough to maintain all the messages they want to see). Thanks. Historically, that was the maximum value because the Windows TextEdit control used by AWT on Windows held only 2^15 characters before silently refusing to accept any more. The new Swing analog of this class inherited this limit for no particular reason; sure, it could be configurable. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Converting from/to strings
I think Henrique Lopes Cardoso wrote: (defrule r1 ?x - (foo) = (bind ?string (implode$ ?x)) ;; IS THERE A WAY OF DOING THIS? ?x is a jess.Fact object. You can call any of the methods of jess.Fact on it -- including toString() and toStringWithParens(), one of which surely does what you want. But I think you need to step back a little and look at your design; in particular, the way in which you're structuring your data. For example, why is it important that the foo part of (foo a b c) be including in your string -- since, given the foo pattern, it's already known? Why not just ... ?x - (foo $?data) = (bind ?string (implode $?data)) ... Now, you say that ?string is just going to be passed to a Userfunction implemented in Java. Why not just pass ?data to that Userfunction (or ?x, if that's what you really want?) Why this preprocessing step? Any time you feel like you're fighting Jess (or any tool) to achieve a certain effect, ask yourself if the problem isn't just that the tool is designed to make it easy to do things some other way, and consider if that other way would work for you. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Jess in a multithreaded environment
I think Florian Fischer wrote: [Charset iso-8859-1 unsupported, filtering to ASCII...] Hello, I am using Jess in a multithreaded environment... I need to understand how Jess works in a multithreaded environment. Is the following description correct? - One lock is on all the data (facts, rules, the state of the engine, etc. ) . That means you can do asserts, retracts, deffacts, defrules and such simultaneously in multiple threads without risk. Yes. - A second lock prevents multiple rules to be fired at the same time. From separate threads, yes. run()/runUntilHalt() can only be executed in one thread at a time. Can I assume that no 2 threads will fire a rule at the same time? Yes. While the RHS is being executed, can I assume no other rule will even be considered for firing before the RHS executed, even if run() is called in the meantime in the same thread or another thread? No. If you call run() reentrantly -- i.e., if a rule fires, and that code itself calls run() again, then another rule could fire during the firing of the first rule. The result is undefined. Don't do this. Will run() be ignored if called from a Java method called from a rule RHS? No, it won't be ignored. I tend to do a run() after every update to any fact. But it might well be that the said update was called from the RHS of a rule firing during a run(). Will this cause problems? Yes it will. Don't do that. This has nothing to do with thread safety, but with whether run() is reentrant. It's not. If one thread is executing run() (and fires and executes rules) and a second threads calls run(), will they both fire rules or will the first thread to all the work? The second thread will block until run returns. If yes, will the second thread wait for the first run() to complete, tu guarantees all rules have fired? The second thread will block until run returns for any reason -- halt() was called, or you called run(N) and N rules have fired, or an exception halts the run, etc. If one thread is executing run() (and fires and executes rules) and a second threads does a deffact() or undeffact(), can the facts be updated while a RHS is executing? There is no deffact() method, but based on your earlier statements I think you mean definstance(). Can facts be updated while a rule is firing? Yes. Values bound on the LHS are copies from the facts that activate a rule before the rule fires, so if the fact changes while the rule is firing, the original bound values are used. Or will the facts change between 2 rules firing? Or will the second thread block until run() returns and all rules have fired? No and no. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Jess in a multithreaded environment (Copies of the fact data)
Ultimately, of course, a Fact is an array, with one element for each slot. When you compile a rule, the rule compiler will look up the names of any slots that are mentioned, and it's the index of the slot that gets compiled into the rule. On the other hand, fact-slot-value is a function that has to look up the index of a slot by name at runtime. The lookup is fast, as it's an O(1) HashMap lookup, but still, it represents a finite amount of overhead. So in other words. (defrule fast-rule (foo (bar ?x)) = (printout t ?x crlf)) represents much less computation than (defrule slow-rule ?f - (foo) = (printout t (fact-slot-value ?f bar) crlf)) So that's one case. It's just a little bad. The other case is calling fact-slot-value on the LHS of a rule, which can be *devestatingly* bad. If you use fact-slot-value on the LHS of a rule, you hide important information from the rule compiler -- namely, what parts of a fact are interesting in a given rule. The rule compiler will use this information to index the Rete memories. If there's no information, then the relevant node memories default to flat lists and linear lookups, which can be very slow. So, for example, this rule is fast, (defrule fast-rule-2 (foo (bar ?x)) (bar (foo ?x)) = (printout t Found a match! crlf)) While this one is terrible (assuming large numbers of foo and bar facts, of course:) (defrule slow-rule-2 ?f - (foo) ?b -(bar) (test (eq (fact-slot-value ?f bar) (fact-slot-value ?b foo))) = (printout t Found a match! crlf)) But actually, this one may be just as bad: (defrule slow-rule-3 (foo (bar ?x)) (bar (foo ?y)) (test (eq ?x ?y)) = (printout t Found a match! crlf)) as might this one (which surprises a lot of people): (defrule slow-rule-4 (foo (bar ?x)) (bar (foo ?y:(eq ?x ?y))) = (printout t Found a match! crlf)) I say might be because Jess tries to do the right thing for these, but can't always do so. In any case, direct matching (including direct negated matches using ~) is always vastly faster than calling a function on the LHS of a rule. I think Jon Weygandt wrote: Ernest, Thanks for your description of locks, the part of values and bindings and fact-slot-value references are of interest. I have 2 cases where rules use the fact-slot-value method, and based upon the original postings multithreaded use case, are these uses thread safe or could the value of the fact change from the original match to the access of slot data. My specific task is to improve the throughput of the application and as I have inherited these rules from another source, I would also be curious as to your thoughts on the performance of fact-slot-value vs. the early binding of all the necessary values in the original rule pattern. The matching test for the rules may involve as few as 2-4 fields, whereas the some-function and access to the fields may be as many as 10 fields. Case 1 (fact-slot-value in rhs) (defrule r1 ?f1 - (FACT1 (OP UPDATE) ... ) ... = ... (some-function (fact-slot-value ?f1 S1)) ) Case 2 (fact-slot-value in lhs) (defrule r1 ?f1 - (FACT1 (OP UPDATE) ... ) (exists (or (test (neq (fact-slot-value ?eqpst S1) (fact-slot-value ?eqpst S2))) (test (neq (fact-slot-value ?eqpst S3) (fact-slot-value ?eqpst S4))) ) ) ... = ... ) Thanks, Jon Weygandt -- Original Message -- If one thread is executing run() (and fires and executes rules) and a second threads does a deffact() or undeffact(), can the facts be updated while a RHS is executing? There is no deffact() method, but based on your earlier statements I think you mean definstance(). Can facts be updated while a rule is firing? Yes. Values bound on the LHS are copies from the facts that activate a rule before the rule fires, so if the fact changes while the rule is firing, the original bound values are used. To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED] - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL
Re: JESS: MethodNameComparator generates error in 70b3
I think Semmel, Glenn S wrote: I looked at the source files and noted the following differences: 70b3's compare() ends with: return ((String) o1).compareTo(o2); Whereas 70a4's compare ends with: return ((String) o1).compareTo((String) o2); Interesting! If you look at the java.lang.String source in JDK 1.5, String is declared to implement ComparableString (which makes sense) and therefore the method compareTo(Object) is now written as compareTo(String), which also makes sense, although it's certainly surprising. This explains the compilation error, but now I wonder how some older code, still expecting compareTo(Object), will be able to run. The JVM must do some magic that, so far at least, I haven't thought about. Anyway, I'm rambling. I will put that cast into the source, but it's probably prudent to use -source 1.4 while compiling Jess itself (which also fixes this problem -- I just checked). - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: exists description in the documentation missing?
I think Fred Janon wrote: [Charset iso-8859-1 unsupported, filtering to ASCII...] I am reading the Jess in Action book and noticed that it lists exists as a Jess' CEs but I could not find it in the online doc for version 6.1. It's here, in chapter 2: http://herzberg.ca.sandia.gov/jess/docs/61/language.html#exists_ce What's the best way to test that a fact doesn't exist? The not CE tests for non-existence. Although what you've written sounds good in English: (not (exists(tick ?))) it's actually just silly. (exists (x)) is actually equivalent to (not (not (x))) -- i.e., It's not true that (not (x)) is true. Therefore, (not (exists (x))) is the same as (not (not (not (x, which, as you can imagine, is precisely the same as (not (x)). - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: WebSite navigation
I think Daniel B. Davis wrote: All browsers I have tested show the navigation items on the web site as too small to read.nbsp; These include: ul liMozilla Firefox 1.0 liNetscape Navigator 7.1 liInternet Explorer 6.0 /ulThese are the ones high on the left-hand side of the page, rendered in shades of pink and white.brbr (Navigation in the Jess 7.0b3 manual.) Thanks, yes, this has been reported. I moved from Linux to Mac OS X as my primary development machine, and the current format changes were intended to make the nav bar look good in Safari; unfortunately, that made it look bad on Windows. It's fixed for the next release which should be on Wednesday. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
JESS: Announcing Jess 7.0b4
Hi Folks, We're pleased to announce the availability of the latest release of Jess, the rule engine for the Java platform, at the usual location: http://herzberg.ca.sandia.gov/jess/download.shtml This release adds a lot of polish to Jess 7 as we approach the final version. There are a number of bug fixes, enhanced features for the JessDE debugger, and a new simplified API for embedding Jess in Java applications. As usual, comments and questions are welcome on the mailing list at jess-users@sandia.gov or directly to me at [EMAIL PROTECTED] From the changelog: Fix slot-specific behavior for null property names in change events (thanks Shan Ming Woo). Fix SAX parse error for facts with no slots (thanks Wang Dong.) Fixed definstance name resolution across modules (Woo). New map, filter, and list functions for functional programming. Run configurations are reused in Eclipse. Can pass command-line arguments from Eclipse Run dialog. Defglobals show up in JessDE debugger. Spaces in path names won't confuse jess.bat (thanks Eric Schubert.) Fix deadlock in debugger when stepping over (read) and (readline) calls (thanks Jim Goodwin.) Start suspended checkbox in debugger. Can specify jess.Main alternate in launch configuration. Tiny font in manual navbar fixed. New URL for Jikes in manual. New quick start section in manual, and a new simplified engine API as described therein: mark(), resetToMark(), add(), addAll(), getObjects(). - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS:Modular deffacts problem
I think David Firmin wrote: I'm trying to use deffacts with a specific module, but am having some problems changing out of that module once the deffacts has taken place. At present, I'm doing the following (although I've simplified the code here, the sense remains the same): I'm afraid you've simplified things a little bit too much. The important points are 1) when and where the defclass for your Java objects is being done, 2) exactly how the object is being put into working memory, and 3) what version of Jess you're using. Jess 7.0b4 was released just today, and it fixes a bug in earlier 7.0 releases related to definstances in the presence of multiple modules, although the symptoms don't sound precisely right. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: multiple shadow fact templates
I think Scott Moss wrote: The order in which rules are fired depends first on the conflict resolution strategy, but if two rules are of equal priority by that criterion, then they'll fire in an arbitrary order that just falls out of the Rete network implementation. That order is affected by, but isn't equal to nor even easily predicatable from, the order in which the rules are defined. That's good to know since one of our developments will be to implement a conflict resolution strategy sound and consistent with a formal logic or, more likely, several conflict resolution strategies based on several logics. The ability to do this is, I think, one of the great strengths of Jess from a modeller's point of view. I imagine that, in so doing, the order of the defrule statements can be entirely irrelevant. Is that right? Only if you replace the existing arbitrary-but-not-random order with your own arbitrary-but-not-random order. As a trivial example, these two rules: (defrule rule-1 = ) (defrule rule-2 = ) will fire in an arbitrary order which will definitely depend on the order in which they're defined. To remove that dependency in your strategy implementation, you'd have to order them based on dictionary ordering of their names, or some other arbitrary criterion. But the point is that yes, you could do that. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: String to Symbol
I think [EMAIL PROTECTED] wrote: How can I convert a string into a symbol? In Java, String string = whatever; Value symbol = new Value(string, RU.SYMBOL); In Jess, (bind ?string whatever) (bind ?symbol (sym-cat ?string)) - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: empty list pattern and ppdefrule
I think Jonathan Sewall wrote: However, in Jess v7.0b4, ppdefrule omits the (data ) pattern from its output. Is our simpler syntax for testing multislots unsupported? Many thanks, Seems to work as ever; this is apparently just a bug in the pretty-printer. Thanks for the report. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: RE: Understanding JESS
I think Daniela CLARO wrote: However I have more two questions, the first one I thought that (reset) clear my knowledge base, I mean, my facts, rules, all things and actually it doesn't. What is the command I can use to clear my knowledge base? There's a chapter entitled The Jess Function List near the end of the manual; it gives some documentation for every function in Jess. You can read that to see what (reset) actually does. There's also a cross-reference page that groups functions by functional area, to help you find related functions. The one you're looking for is (clear). More one thing, is there any command that lists all facts before execution, for example, I only want to know which facts I have put in my knowledge base before execution. It's (facts). - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: String to Symbol
I think Roger Studner wrote: (defrule count-icd9-codes ?c - (accumulate (bind ?count 0) ;; initializer (bind ?count (+ ?count 1)) ;; action ?count ;; result (encounter (code ?c : (eq ?c 440))) ) ... This (and anything in the accumlates match area) *always* returns 0 as the count variable. I took the example (modified) from the 7.0 'new features' area of the docs. You've used the same variable ?c to mean two totally different things in the same pattern: you're binding the result of the accumulate to it, but you're also binding the contents of the code slot to it. This is tricky enough that even I would have to trace through with a debugger to see what will happen -- but I can guarantee you that it won't be the answer you're expecting! Finally, note that there's no reason to write patterns like this (encounter (code ?c : (eq ?c 440))) when the following is equivalent but simpler, clearer, *and* more efficient: (encounter (code 440)) Conveniently, making this change will also fix the problem outlined above! - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Behavior change from 6.1p7 to 7.0b3 with modify function
I think Jon Weygandt wrote:
it looks like modifying a fact sometimes requires the equivalent of:
For each slot modified
{
Retract the fact
Set the slot
Assert the fact
}
Yes, more or less. Special versions of retract and assert can be
used to cut a few corners in this specific case, but that's just how
the Rete algorithm works. Same way re-hashing a hash table works, too,
if you think about it, more or less.
Although in 6.1p7 it appears that from the rules modify accepts multiple
slot/values and is optimized (whereas Rete offers only a single
slot/value at a time) and 7.0b3 seems to do the inefficient loop.
Jess 6 and earlier would retract the fact, modify all the slots, then
assert. The current version of Jess 7 will do the whole cycle for each
modified slot. The reason for this is that the slot-specific
activation features need to know the slot that's been modified when
the assert is done. There are two ways to accomplish this: either
provide a collection of slot names and allow multiple simultaneous
modifies, or change things to really only modify one slot at a time,
and then pass around just the one slot name.
I've gone back and forth on which is better. Obviously it depends on
how frequently a program uses the multiple-modify syntax. If it's used
infrequently, then forcing the Rete network to iterate over all those
one-item collections is inefficient. If multiple-modify is used a lot,
then it's a net gain to pass the collections around.
My impression is that multiple modify -- i.e.,
(modify ?fact (slot-1 X) (slot-2 Y) (slot-3 Z))
is used infrequently. I'd be interested to hear otherwise, though!
-
Ernest Friedman-Hill
Advanced Software Research Phone: (925) 294-2154
Sandia National LabsFAX: (925) 294-2234
PO Box 969, MS 9012 [EMAIL PROTECTED]
Livermore, CA 94550 http://herzberg.ca.sandia.gov
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Re: JESS: How does the pattern match: ?trans_state SI | MI | EI
I think Jon Weygandt wrote: Jess, That's her picture on the cover of Jess in Action :) (TRANS_STATE ?trans_state SI | MI | EI) My procedural view would be the pattern is evaluated as: (TRANS_STATE (?trans_state SI) | MI | EI) And if the match for SI fails, not sure what ?trans_state would be. However from testing, it looks like the binding is a byproduct of the first test and the statement is really evaluated like: (TRANS_STATE ?trans_state (SI | MI | EI)) But to write this results in a compile time error. The | connective is actually handled by transforming it into calls to the and and or predicate functions: Jess (defrule foo (TRANS_STATE ?trans_state SI | MI | EI) = ) TRUE Jess (ppdefrule foo) (defrule MAIN::foo (MAIN::TRANS_STATE ?trans_state:(or (eq SI ?trans_state) (eq MI ?trans_state) (eq EI ?trans_state))) =) The meaning is somewhat different if this pattern were unifying with ?trans_state rather than defining it: e.g., Jess (defrule foo (X ?trans_state) (TRANS_STATE ?trans_state SI | MI | EI) = ) TRUE Jess (ppdefrule foo) (ppdefrule foo) (defrule MAIN::foo (MAIN::X ?trans_state) (MAIN::TRANS_STATE ?_blank_1:(or (and (eq ?trans_state ?_blank_1) (eq SI ?_blank_1)) (eq MI ?_blank_1) (eq EI ?_blank_1))) =) Now, it actually matches your original intuition. The general rule is that binds more tightly than |, except that variable definitions are moved outside the whole conditional expression. ~ binds tighter still. If you need to express more complex logic than you can with , |, and ~, you can use the and, or, and not predicate functions directly. BTW the original customer written rule has the TRANS_STATE slot twice in the pattern match. This fails as it seems the binding to ?trans_state isn't done, and thus the test for ~?trans_state always returns true. This issue has been reported before; it's on the list of things to fix. Thanks for the reminder. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: String to Symbol
I think Roger Studner wrote: (deftemplate employee (slot salary)) (deffacts employee-facts (employee (salary 1007700)) (employee (salary 1002347700)) (employee (salary 107712000)) ) (watch all) (reset) (defrule count-highly-paid-employees ?c - (accumulate (bind ?count 0) ;; initializer (bind ?count (+ ?count 1)) ;; action ?count ;; result (employee (salary ?s:( ?s 10 ;; CE = (printout t ?c employees make more than $10/year. crlf)) (run) Move the reset *after* you define the rule (the normal pattern is to define rules, then add data) and it works fine. This shouldn't matter, but it apparently does. Congratulations, you've found a bug! Thanks for the report. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Strange Jess / Eclipse crash
I think Matthew Hutchinson wrote: [Charset iso-8859-1 unsupported, filtering to ASCII...] G'day everyone, This is more of an Eclipse question, however, I only get this error when trying to open CLP files. Eclipse with Jess has been working fine for weeks, and now suddenly Eclipse completely closes when i double-click a CLP file to edit it in eclipse. I have not changed any classpath stuff, or anytihng else. I really need to this to work... :-( Your 30-day trial version of Jess has expired. You can get an academic license at no cost by contacting Craig Smith, [EMAIL PROTECTED] - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Strange Jess / Eclipse crash
I think Matthew Hutchinson wrote: [Charset iso-8859-1 unsupported, filtering to ASCII...] Hi, Actually, I have already got the full version from Craig and it works fine. Also, my classpath and eclipse stuff is all set to the full version jar file also. Good, but be that as it may, one can still clearly see the obfuscated class names of the trial version JAR file in the stack trace you sent in your earlier message. Find all copies of jess.jar on your machine, and replace them with known good ones from the licensed distribution. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Checking if a fact exists
I think [EMAIL PROTECTED] wrote: (defrule rule1 (x1 value1 ?cf1) (x2 value2 ?cf2) (x3 value3 ?cf3) = (assert (x3 value3 (min ?cf1 ?cf2 ?cf3))) Perhaps this rule should retract or modify the existing fact, rather than asserting a second one, as this does? (defrule rule2 (x1 value1 ?cf1) (x2 value2 ?cf2) = (assert (x3 value3 (min ?cf1 ?cf2))) ) And this one should surely include a pattern like (not (x3 value3 ?)) or otherwise it will fire whether there is an x3 fact or not. By this way, the number of rules of the system would duplicate. Is there a better solution? You want to do one thing under one set of conditions, and another thing under other conditions, so this really does warrant having two separate rules. Jess will notice the similarities, by the way, and share code in the Rete network for these two rules. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: variable facts
I think =?iso-8859-1?Q?=5BEXTERN=5D_Manuel_Kollmu=DF?= wrote: Isn_t it possible to assert a variable as a fact or a variable fact? like this: (bind ?var number1) _. (assert (?var)) No, the type of the fact must be known when the call to assert is compiled. You can use an extra level of indirection, though, by building the code as a string and then evaluating it: (eval (str-cat (assert ( ?var - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Or problem
I think mauricio rincon wrote: [Charset iso-8859-1 unsupported, filtering to ASCII...] Hi... I have a problem with OR (v) operator. I_m using this operator in a rule, that should be fired only once when both of the conditions happened . The problem is that if both events are happening, the rule fires twice. example; (defrule names (or (name mao) (name july)) = (printout hello world)) I_m getting: hello world hello world In this particular case the solution is simple: use the 'or' connective constraint, not the 'or' conditional element: (defrule names (name mao|july) = (printout hello world)) In the general case, when the 'or' conditional element is really needed, the solution is to make sure that when the rule fires, it has some detectable effect, and then match the negation of that effect on the left-hand-side of the rule; trivially (defrule names (or (name mao) (name july)) (not (names fired)) = (assert (names fired)) (printout hello world)) - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Multifield matching nil
I think Steve Solomon wrote: This is a minor complaint. Why can't one use nil to match an empty list? Short answer: because Jess inherited its basic rule language semantics from CLIPS, and that's how it works in CLIPS. Only the pattern (sprocket ?id) matches (sprocket 2) with no following symbols. I would have thought that (sprocket ?id nil) at least would also work, i.e. nil matching the empty list, especially considering that ~~nil matches a non-null symbol. Perhaps my concept of nil is influenced too much by Lisp. Yes, that's pretty much it. Jess's 'nil' is more like Java's 'null'. In Lisp, 'nil' means an empty list, while in Java, 'null' means no list at all, whereas an empty List is a List object with no contents. In Lisp, there's no difference between these two ideas, but there definitely is in Java and in Jess. Whereas in Lisp 'nil' means 'no value', in Java 'null' is a definite specific value; Jess is the same way. Instead of using nil to match nothing in a list, you use multifields, basically variables that start with $?, to match nothing or something. The patterns (sprocket ?id $?) (sprocket 2 $?) (sprocket $?) all match both (sprocket 2) and (sprocket 2 3 4). - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: slot-specific and multifields
I think Greenblatt, Howard wrote: I have encountered some odd behavior using the slot-specific template declaration and multifields. Thanks for the report, Howard. With your nice example, it didn't take long to track this down. Although slot-specific is the thing that triggers the bug here, it was actually more primitive than that, and had something to do with the handling of multiple multifields in a single fact. This otherwise benign bug (i.e., until slot-specific was implemented, nobody should ever have noticed) seems to have been in for a while. The one-line fix, if you're playing along at home, is [EMAIL PROTECTED] Jess]$ cvs diff -r 1.5 -r 1.6 jess/Node1MTMF.java Index: jess/Node1MTMF.java === RCS file: /home/ejfried/cvsroot/Jess/jess/Node1MTMF.java,v retrieving revision 1.5 retrieving revision 1.6 diff -r1.5 -r1.6 98c98 f.setIcon(oldFact); --- f.setIcon(oldFact.getIcon()); - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Debugger
I think Jeffrey Davine wrote: I'll do the research, but as a general matter, do you think the Jess API exposes enough information (particularly concerning the rete tokens) so that I could write such a tool? Alan's more optimistic, but I myself don't think this can really be done at the level you'd like without using and/or modifying private APIs in Jess. The details of the Rete network implementation aren't exposed as public APIs just because they change often and exposing them would present too great a support burden. But I'll tell you what: one enormously valuable contribution in this area would just be writing use cases/storyboards/walkthroughs/UI mock-ups. I personally have a hard time picturing just how this will be integrated into the more traditional source-oriented Eclipse debugger architecture. Remembering that the left-hand-sides of rules can be shared in the Rete network, it would be extremely helpful for someone to present a coherent view of how this kind of debugging would work. Personally I always imagine something like the existing Rete Network View in the JessDE, but live, connected to a debugged program. Further, there's a notion of the current Rete node which is highlighted in the diagram, and you can select an inspect the current node or any other node. You can push a step button which somehow shows you which tests pass and what Tokens get created, and you can watch them go from that current node to the other nodes. But the details are still fuzzy to me. How does this interact with stepping through procedural parts of the program? Can we start a Wiki page about this? ... OK, here you go: http://herzberg.ca.sandia.gov/jesswiki/view?ConstantineDebuggerPlanning Any and all contributions welcome. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Converting Object to Object[]
Jess's usual representation for arrays is a Jess list -- is that what you're looking for? There isn't a public API built into Jess for turning an array into a List, but now that you're pointing out the need, it seems like a good addition. For now, though, your obj2array function is the best way to go. I think Yura wrote: [Charset koi8-r unsupported, filtering to ASCII...] Hi jess-users Is there any way 2 convert Object to Object[]? I need 2 pass several arrays from Java to Jess so I wrapped them in a Vector. But executing (call ?vector get 0) returns just Java-Object:[Ljava.lang.Object; I can write some wrapper like Object[] obj2array(Object) but probably Jess can handle such situations? Yuri - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Object to built-in type
I think Roger Studner wrote: v = new Value(l, RU.SYMBOL); ... v = new Value(i, RU.SYMBOL); For the record, note that both of these lines will throw exceptions at runtime. To contstruct an RU.SYMBOL from a numeric type, you have to convert the value to a String yourself and pass that String to the Value constructor. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Conflic Resolution Implementation
There's no tutorial guide or anything like that. The basic procedure
is very easy: implement the jess.Strategy interface, then use
(set-strategy classname) to load it into Jess. There's really just
the one compare() method to write; it's supposed to implement the
spaceship operator (ie., comparison that returns negative, 0, or
positive to indicate how the activations should be ordered.) As long
as your ordering is internally consistent, it can be anything you
want. You can even ignore salience if you'd like, so that a perfectly
valid implementation could be something as simple as
/**
* A Jess conflict resolution strategy that gives priority to
* rules with more patterns.
*/
public SizeStrategy implements jess.Strategy {
public int compare(Activation a1, Activation a2) {
return a1.getToken().getSize() - a2.getToken().getSize();
}
public String getName() { return size; }
}
I think Bogdan Werth wrote:
[Charset iso-8859-1 unsupported, filtering to ASCII...]
Hi,
I just wondered whether there are any place where I can get some more
information about how to write your own conflict resolution strategy for
Jess. There is a bit of information about this issue in Jess In Action
but not enough to start your own development. I am doing agent based
modeling with Jess and RePast and one of developments in the course of
my PhD will be to implement a conflict resolution strategy sound and
consistent with a formal logic or, more likely, several conflict
resolution strategies based on several logics.
Many thanks in beforehand.
--
Bogdan Werth
Doctoral Researcher Centre for Policy Modelling
The Graduate School of Business
Aytoun Building
Aytoun Street
Manchester
M1 3GH
UK
Tel: +44 161 247 6481
Fax: +44 161 247 6802
Email: [EMAIL PROTECTED]
Web: http://cfpm.org/~bogdan
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Advanced Software Research Phone: (925) 294-2154
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Re: JESS: Template Hierarchy
I think Jeffrey Davine wrote: Perhaps the place to ask this question is the Constantine Planning Wiki - but would it be difficult in the next version of Jess to implement a hierarchical template structure? ... (deftemplate Individual extends LegalAgent OK, let's get in the time machine... going back... mucking with the space time continuum... writing a little code... OK, I'm back! Jess has had exactly the feature you describe, using your proposed syntax, since version 5.0a1. It works exactly as you describe. The code you've shown here ought to work perfectly. Thank you! - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Size of an activation record
I think Roger Studner wrote: Is there (I read something 'akin' to this in the mailing archive) a big performance hit as well? I like to use beans/shadow facts for a variety of reasons, but have always been under the impression that when i'm going to assert a 'huge' number of a particular fact type, that I should be using a deftemplate/fact API versus just using defclass/definstance of a bean representing the exact same information. There *was* a performance issue in earlier versions of Jess 6 related to Fact slots containing Java objects (doesn't matter whether the Fact is a plan fact or a shadow fact.) The issue was that Jess didn't do the kind of efficient indexing of those slots that it can do with primitive types. That's been cleared up now. There's no performance penalty for using definstances. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Editor couldn't be initialized
I think Yura wrote: I'm receiving the Editor couldn't be initialized when trying to open clp-files in Jess70b4-editor (yes, I tried the -clean switch). Jess70b3 works well. Can anybody help? JessDE 7.0b4 now requires Eclipse 3.1 -- the sudden changeover with this particular version wasn't really intentional, and should have been noted in the release notes. In any case, because 3.1 is the current release, and there have already been several 3.2 milestone builds, I think this makes sense. It's likely that 3.1 will still be the current version when 7.0 final is released. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Fact object not in working memory error
Most likely the problem is that some of your classes (perhaps com.ngc.dts.domain.common.PerDiemEntitlement) have mutable hash codes, making them unsuitable for use as keys in a hash table (try using one of these objects as a key in a HashMap, change the values of some properties, then try to look up the same object; it will fail) and some properties of these objects are being modified outside of a (modify) call. This causes problems in Jess 6. Jess 7 works around this by providing a function that lets you warn Jess about this issue for a particular class. I think erich.oliphant wrote: [Charset iso-8859-1 unsupported, filtering to ASCII...] I am having a strange problem. I am getting the following error (debug included). The populate-last-travel-day rule fires based on the presence of facf-5 (among others). The error is thrown in the rule body where I try to modify f-5. I am not sure how the fact cannot be in working memory as the rule fired because of it's existence (and I'm not retracting it) The body of the rule only modifies this fact and asserts a new one. These rules are driven from Java code and verified that the supporting Java object still exists at the time the exception is thrown. rule -- (defrule populate-last-travel-day-entitlement first day at perdiem location entitlement ?arrlocation - (com.ngc.dts.domain.common.TripLocation (arrivalTripItem ?ati) (perDiemLocation ?x:(eq ?x nil))) (test (neq (?ati getTravelDate) nil)) ?perdiemLocation - (com.ngc.dts.domain.common.TripLocation (departureTripItem ?dti) (perDiemLocation ?pdLocation:(neq ?pdLocation nil))) ?entitlement - (com.ngc.dts.domain.common.PerDiemEntitlement (date ?pddate) ) ;;@todo investigate why same-day is not working as expected ;;(test (neq (same-day (?dti getTravelDate) ?date) FALSE) ) (test (call org.apache.commons.lang.time.DateUtils isSameDay (?ati getTravelDate) ?pddate)) (test (call org.apache.commons.lang.time.DateUtils isSameDay (?dti getTravelDate) (?ati getTravelDate))) (not (travel-day (date ?pddate))) = ;; get the per (bind ?mie (ognl-get ?pdLocation getEffectivePerDiemRate(#date).getMealsAndIncidentalsRate() date (fact-slot-value ?entitlement date))) (modify ?entitlement (perDiemLocation ?pdLocation) (mealsAndIncidentalsAllowed (?mie multiply .75))) (assert (travel-day (date ?pddate))) ) -- debug and error -- MAIN::populate-first-travel-day-entitlement: +1+1+1+2+1+2+1+2+1+2+2+2+t MAIN::populate-last-travel-day-entitlement: =1=1=1+2=1+2=1+2+2+2=1+2+t MAIN::populate-full-perdiem-day-entitlements: =1=1+1+2+2=1+2+2+2+1+2+t MAIN::assign-cmr: =1+1+1=1+2+2+2+2+a+2+t MAIN::assign-pmr: =1=1=1=1=2+2+t MAIN::assert-entitlements: +1+1+t MAIN::assign-gmr: =1=1=1=1=2+2+2+2+t MAIN::zero-allowed-duty-conditions: =1+1+1+1+2+t MAIN::actual-lodging: =1=1=1=1+2+t MAIN::assert-entitlements: +1+1+t == f-0 (MAIN::com.ngc.dts.domain.common.Trip (auth Java-Object:com.ngc.dts.domain.common.Authorization) (class Java-Object:java.lang.Class) (documentKey nil) (endDate nil) (endLocation nil) (id nil) (startDate nil) (startLocation nil) (taNumber nil) (travelOrderComments nil) (tripDescription nil) (tripDuration nil) (tripLocations Java-Object:java.util.ArrayList) (tripNumber 1) (tripProfile nil) (tripPurpose nil) (tripType nil) (OBJECT Java-Object:com.ngc.dts.domain.common.Trip)) == Activation: MAIN::assert-entitlements : f-0 FIRE 1 MAIN::assert-entitlements f-0 == f-1 (MAIN::com.ngc.dts.domain.common.PerDiemEntitlement (acutalLodgingCostLimit nil) (class Java-Object:java.lang.Class) (date Java-Object:java.util.GregorianCalendar) (dutyConditions Java-Object:java.util.HashSet) (leave nil) (lodgingAllowed nil) (lodgingExpense Java-Object:com.ngc.dts.domain.common.Expense) (mealsAndIncidentalsAllowed nil) (mealsAndIncidentalsExpense Java-Object:com.ngc.dts.domain.common.Expense) (otherEntitlementType nil) (perDiemLocation nil) (OBJECT Java-Object:com.ngc.dts.domain.common.PerDiemEntitlement)) ent date from code: 01/01/2006 12:00 PM == f-2 (MAIN::com.ngc.dts.domain.common.PerDiemEntitlement (acutalLodgingCostLimit nil) (class Java-Object:java.lang.Class) (date Java-Object:java.util.GregorianCalendar) (dutyConditions Java-Object:java.util.HashSet) (leave nil) (lodgingAllowed nil) (lodgingExpense Java-Object:com.ngc.dts.domain.common.Expense) (mealsAndIncidentalsAllowed nil) (mealsAndIncidentalsExpense Java-Object:com.ngc.dts.domain.common.Expense) (otherEntitlementType nil) (perDiemLocation nil) (OBJECT Java-Object:com.ngc.dts.domain.common.PerDiemEntitlement)) ent date from code: 01/02/2006 12:00 PM == f-3 (MAIN::com.ngc.dts.domain.common.PerDiemEntitlement (acutalLodgingCostLimit nil) (class Java-Object:java.lang.Class) (date
Re: JESS: Userfunctions and Jess - Java type conversion
I think erich.oliphant wrote:
[Charset iso-8859-1 unsupported, filtering to ASCII...]
Hmm, ok thanks, I understand better now. However, jess.Userfunctions return
Value's so is there anything I can do in that case to activate the type
conversion? I tried Value.resolve() but that did not help.
You know, there's not actually a public API for getting Jess to do
those conversions on demand from Java, although you've made a good
case as to why there should be. The method you want is the static
method jess.ReflectFunctions.objectToValue(), which takes two
arguments, the object and the class of the Object; this is so that you
can pass (for example) java.lang.Boolean as a Boolean.class or as a
Boolean.TYPE -- i.e., a primitive. You could simply use obj and
obj.getClass() as the two arguments. Since it's private, you could
either change the source to make it public, or you could call the method
reflectively using something like
Object prop = ...
Method oTV =
Class.forName(jess.ReflectFunctions).getMethod(objectToValue);
oTV.setAccessible(true);
Value result = (Value) oTV.invoke(null, new Object[] {prop,
prop.getClass()});
Of course, you'd probably want to get the Method object and cache it
in a member variable someplace, and then stick all of this into your
own objectToValue method.
-
Ernest Friedman-Hill
Advanced Software Research Phone: (925) 294-2154
Sandia National LabsFAX: (925) 294-2234
PO Box 969, MS 9012 [EMAIL PROTECTED]
Livermore, CA 94550 http://herzberg.ca.sandia.gov
To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]'
in the BODY of a message to [EMAIL PROTECTED], NOT to the list
(use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Userfunctions and Jess - Java type conversion
I think erich.oliphant wrote: I tried that function, but it doesn't seem to exist on the jess.ReflectFunctions class (I am using 7.0 beta 4. There seems to be a a static Value a(Class, Object) throws JessException method based on browsing the class file. Could this be it? You're not using a licensed version of Jess. Contact Craig Smith, [EMAIL PROTECTED], to obtain a license. Also, in regards to the original question, just thought about something. Since returning new Value(Boolean()) from my userfunction returns the Java Object, I'm still not clear about why this didn't work: (test (eq (ognl-get ?obj booleanProperty) (Boolean.TRUE))) shouldn't 'eq' call returnedObj.equals(Boolean.TRUE) ? The Jess function (Boolean.TRUE) returns the symbol TRUE, which is not the same at the Java object Boolean.TRUE; as I said before, calling a Java function from Jess reflectively always converts the result to a Jess data type. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Re: Bug
I think Yura wrote: I'm sorry - it's there in the manual. I should be more attentive. By my calculation, you've reported 4 bugs, and 3 of them were real -- so you're batting .750 . Seems like an excellent average to me! - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Probelm with property change listeners in Jess7b4
Hi, In Jess 7.0b3, the default for definstance type changed from dynamic to auto. If you specified dynamic as the last argument to definstance, then Jess would try to register itself with your Bean as a PropertyChangeListener; this used to be the default, so that you had to write static if you didn't want this behavior. The new default is auto. In this case, Jess looks at the Bean to see if it accepts PropertyChangeListeners and only registers itself if the Bean does, indeed, accept them. Jess's current definition of indeed accepts them is that the following two methods exist with these exact signatures: public void addPropertyChangeListener(PropertyChangeListener); public void removePropertyChangeListener(PropertyChangeListener); So if this worked for you in dynamic mode, my guess is that your Beans don't have the removePropertyChangeListener method. The right thing to do is add it, but a band-aid would be to say (definstance block ?g dynamic) This will work until you try undefinstance which, of course, won't work (it never did.) If I've guessed wrong, and it's something else, let me know, please! I think Dusan Sormaz wrote: [Charset iso-8859-1 unsupported, filtering to ASCII...] I am running example that uses property change listeners to update shadow fact when object changes. Problem that I have is that running same code in Jess7.0b2 and Jess7.0b4 produces different results. Here is the log for both: Jess, the Rule Engine for the Java Platform Copyright (C) 2005 Sandia Corporation Jess Version 7.0b4 11/1/2005 Jess (require defclasses) defclasses Jess (bind ?g (new Block G)) Java-Object:edu.ohiou.imse.ise891.blockworld.Block Jess (definstance block ?g) Fact-0 Jess (facts) f-0 (MAIN::block (class Java-Object:java.lang.Class) (name G) (OBJECT Java-Object:edu.ohiou.imse.ise891.blockworld.Block)) For a total of 1 facts in module MAIN. Jess (?g setName gfd) before PCS after PCS Jess (facts) f-0 (MAIN::block (class Java-Object:java.lang.Class) (name G) (OBJECT Java-Object:edu.ohiou.imse.ise891.blockworld.Block)) For a total of 1 facts in module MAIN. Jess Jess, the Rule Engine for the Java Platform Copyright (C) 2005 Sandia Corporation Jess Version 7.0b2 8/11/2005 Jess (require defclasses) defclasses Jess (bind ?g (new Block G)) External-Address:edu.ohiou.imse.ise891.blockworld.Block Jess (definstance block ?g) Fact-0 Jess (facts) f-0 (MAIN::block (class External-Address:java.lang.Class) (name G) (OBJECT External-Address:edu.ohiou.imse.ise891.blockworld.Block)) For a total of 1 facts in module MAIN. Jess (?g setName gfd) before PCS after PCS Jess (facts) f-0 (MAIN::block (class External-Address:java.lang.Class) (name gfd) (OBJECT External-Address:edu.ohiou.imse.ise891.blockworld.Block)) For a total of 1 facts in module MAIN. Jess While Jess7.0b2 works as expected, Jess7.0b4 doe snot update fact when object changes. Any ideas why is this happening? Dusan Sormaz * * Du_an _ormaz, PhD, Associate Professor * Ohio University * Industrial and Manufacturing Systems Engineering Department * 277 Stocker Center, Athens, OH 45701-2979 * phone: (740) 593-1545 * fax: (740) 593-0778 * e-mail: [EMAIL PROTECTED] * url: http://www.ent.ohiou.edu/~sormazhttp://www.ent.ohiou.edu/~sormaz * - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Bug?
I think Yura wrote: [Charset koi8-r unsupported, filtering to ASCII...] Hi jess-users JessDE doesn't parse this rule (saying: 'TRUE' is a symbol, not an integer): (defrule rule (declare (salience (+ 1 1))) = ) whereas Jesp makes no complaints. Yep. I can reproduce this and now that you point it out, I immediately see what's happening. Thanks for the report. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: DefRule - Memory Leak
I think Hariprasath Manivannan wrote: - Has anyone faced this issue with Jess5.0? If so please send the possible solutions. Jess 5.0 is unsupported. The last release of any version of Jess 5 was 5.2 in June, 2000; that's over five years ago. Jess has evolved considerably since then, and many bugs have been fixed, including, as you might expect, various memory leaks. My suggestion is to upgrade to the current version. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: defadvice before/after bug?
I think [EMAIL PROTECTED] wrote: Am I wrong to say that the 'misfeature' mentioned below hasn't made it into a feature yet in the latest release 7.0 b4? Is there any plan to still add it in time for 7.0 final? I've written defadvice for every numeric Jess-function (+, -, *, /, , =, , =, =, , min, max, div, ...) to support BigDecimals only to discover that they don't support nesting. The only solution I see for now is to convert them into deffunctions, and go through all my rules one by one to change the function call. This had completely fallen off the radar, but now that you've brought it up, I'll put it on the list. Thanks for the reminder. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Problems with SWT_AWT in Eclipse on MacOS X
I think Dona Mommsen wrote: On MacOS X, Eclipse will crash with error: Can't start the AWT because Java was started on the first thread. Make sure StartOnFirstThread is not specified in your application's Info.plist or on the command line Yes, I can reproduce this on my Powerbook. There is an excellent workaround that could be implemented, and in fact it's not really a workaround but a better way of doing things which would improve other parts of the JessDE as well -- but it's a chunk of work that probably won't be done for Charlemagne. As an alternative, I could offer the option to disable validating Java class names, and then have validation turned off for Macs. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Which comes first, the chicken or the rule?
I think Matthew Hutchinson wrote: Just a conceptual question... since starting with Jess, it always seemed to me generally you have the rules established first, then load in facts which in turn trigger these rules. No problems there. But is it proper to consider having the facts already in memory and *then* adding rules which I know will trigger - basically a sort of query on the data mentality? Is this a bad concept? Jess will work either way; you can even add rules to a running program. But in general, Jess is designed with the rules, then facts paradigm in mind. For a given collection of facts and rules, defining the rules first, then populating working memory will be faster than doing thing the other way around -- but both ways are correct and will work fine. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Help on the syntax of a rule.
I think ROSSEL, Olivier (CIMPA) wrote: I am using Jess with Protege. I want to write a rule that says: run when you get an oject FOO with a non-empty slot called 'name' and where there is no fact foo with property bar equal to the slot value. I would intuitively wirte that this way: (defrule doStuff ?o - (object (is-a FOO) (name ?name~nil)) (not (foo (bar ?name))) = ... ) Is it a correct syntax? There were some extra close-parentheses, which I've removed. I also added a not nil condition to meet the non-empty requirement, assuming that nil is the default value for that slot. Other than that's it's fine as far as I know -- whether it's actually correct or not depends on the object and foo templates. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
JESS: Problem with trial distribution
Several people have reported that there was a problem with the distribution file for the trial version (only) of Jess 7.0b5. The symptom is basically that the JessDE just doesn't work. The licensed download is unaffected. I've corrected the problem and posted a new binary. If you've been having trouble with the trial version (only), then downloading this new file should fix them. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Checking for null/nil on the RHS
I think erich.oliphant wrote: [Charset iso-8859-1 unsupported, filtering to ASCII...] (if (eq ?effRate nil) then ;;(dts-log-error No effective rate found for (call com.ngc.dts.util.DateUtils formatDateTime ?pddate)) return ) That return is just the symbol return, not the function call (return). This symbol is the last expression in the if function call, so if is returning it, but otherwise, it's just being ignored. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: ppdefrule doesn't make sense - is this a Jess 6.1 bug?
I think Hector Urroz wrote: [Charset iso-8859-1 unsupported, filtering to ASCII...] Thanks for the response. It does seem a bit odd to automatically and silently modify code. Why not throw an exception? Is this done elsewhere in Jess? What is the rationale? Did I stumble onto a reserved rule name? Some rules get transformed in various ways as they are compiled -- for example, | connectives are actually transformed into or function calls, and ppdefrule will show them that way. And Jess inserts an initial-fact pattern in various situations; this is described in the manual. But I think this is only case where Jess inserts a pattern than matches a user template. As I recall, it was done for defensive reasons: because if Jess doesn't insert that pattern, then if people don't include it themselves (which is the right thing to do 99.99% of the time) there will be extra, spurious firings of the need-X rules, and I got tired of explaining why they were happening. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: JESS website
I think Vageesh Setty wrote: [Charset iso-8859-1 unsupported, filtering to ASCII...] Website seems to be down for a while.. is http://herzberg.ca.sandia.gov/jess/docs/70/programming.html right URL? It's OK now. Thanks. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Watch all - '1 ' inside defrule
I think Daniela CLARO wrote: MAIN::installer-barreaux-metallique: =1=1=1=1+t MAIN::installer-barreaux-metallique1: =1=1=1=1+t What actually this means for Jess? Internally, Jess breaks rules containing the or conditional element into multiple rules. In general, you shouldn't worry about it; it doesn't affect how you work with Jess. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: retract doesn't work like I want it to do
I think =?iso-8859-1?Q?H=FCbner?= wrote: [Charset iso-8859-1 unsupported, filtering to ASCII...] Hello everybody, I need a hint from you. When I try to retract a fact, all other facts are reactivated. ... Can somebody tell me what's wrong with the code? You've got a bunch of rules with the pattern (not (repair ?)) When you assert a fact like (repair X), all these rules are deactivated. When you later retract the repair fact, all these rules are activated again. This is how things are supposed to work. If these rules are no longer relevant, then you have to make that explicit. You could use multiple modules, so that the rules that matter in each stage are in their own module, and the focus could be changed over time; or you can use a phase fact: a special fact that indicates which set of rules matter, and all the rules can match it as appropriate. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Finding fact the max/min slot value
I think erich.oliphant wrote: [Charset iso-8859-1 unsupported, filtering to ASCII...] Hi, I am trying to figure out the best way to have a rule fire only for a fact whose slot value is the min or max of a group of facts. Match a negated pattern to the (nonexistent) fact in which some number is greater than the greatest value. (defrule biggest-number (number (value ?val)) (not (number (value ?val2:( ?val2 ?val = ) - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Logical dependency bug?
I'd call that a bug, yes. Thanks. I think Yura wrote: Don't know whether it's a bug but after (deffunction fun () (assert (b 2))) (defrule rule (logical (a))=(assert (b 1))) (defrule rule2 (logical (a))=(fun)) (assert (a)) (run) (retract 0) deletes only (a) and (b 1). (b 2) doesn't seem to have a logical dependency on (a). - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: persistent storage of facts and rules
I think Matthew Hutchinson wrote: g'day everyone, when it comes to sotrage of rules and facts, how are most people handling it? Are you using JessML? Also, has anyone been storing the JessML in a database? I don't think too many projects are using JessML yet, although I expect that many will after the final release. The specifics of the JessML language have still been changing a bit. Those installations that don't store rules in flat files often use Jess language rules stored in a VARCHAR column in a database. I know of many systems of this type. as far as facts are concerned, do y'all just store them in plain text files? i also noticed that the Rete object is serializable, is this feature used often? Most large applications use Java objects rather than native Jess facts, and those objects are stored in the usual ways, independent of Jess. But flat files (as are produced by save-facts) work well for plain facts. Rete's serializability is used by the bload/bsave commands, and it's also used by some mobile agent frameworks. In a few cases it's been used for web app clustering, although I think a Rete object is somewhat heavyweight to be put into a session. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: Question on defadvice
I think Lakshmi Vempati wrote: [Charset iso-8859-1 unsupported, filtering to ASCII...] I am trying to use defadvice (before reset and after clear) and I noticed the following problem: If reset (or clear) is invoked via a a programmatic call to the reset (or clear) method defined in the Rete class, it does not trigger the defadvice but if instead I execute either reset (or clear) on the command line or use the executeCommand method defined in the Rete class, it does trigger the defadvice. This is precisely how things should work. You're adding advice to the (reset) and (clear) functions in the Jess language; the functioning of the Rete.reset() and Rete.clear() Java methods is unaffected. If you want to execute some code every time Rete.reset() is called, you can register a JessListener with the Rete object. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
