February 2007 - rules-users - Jboss List Archives

by Anstis, Michael (M.)

Hi, Just a note to enquire as to the status of the captioned? Have they progressed towards release since http://markproctor.blogspot.com/2007/01/relocation-relocation-repository .html? With kind regards, Michael Anstis ------------------------------------------- COSMO(S) * Trafford House (Int) 8 718 2239 * Trafford House (Ext) +44 (0)1268 702239 * <manstis1(a)ford.com> Ford Motor Company Ltd. Registered in England: No. 235446 Registered Office: Eagle Way BRENTWOOD Essex CM13 3BW

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RE: [rules-users] calls to 'Helper' classes in LHS - are they all owed?

by Olenin, Vladimir (MOH)

Thanks, Mark. Are there any plans on making return value, predicate and eval expressions indexable (in case it is possible at all)? Would it be included in 3.2 release? I understand that DROOLS can not guarantee that helper method will return the same value each time and probably that's why excludes such cases from index, but the same goes for 'getters' of the fact objects - DROOLS can't guarantee the getter will return the same value each time, so it just have to assume it (and it is outlined in the documentation). There are a few use case that might need this kind of functionality, eg to cache the results of 'associative' lookup. Especially for the 'Decision Tables'. The problem I'm facing right now is I need to 'expand' the list of codes based on some id and use those codes as constraint: MyObject(field <= LookupMap.getCodes($param)) Where $param is a value from Decision Table data. In this particular case a set of, say 100 codes, can be described with a simple ID. For more complex cases a pseudo 'set select' expression can be passed as a parameter (eg, LookupMap.getCodes("groupId_1 - grouperId_2"), which should return the intersection of codes in groupId_1 and groupId_2). In any case, the <key, value> pairs returned by LookupMap class would remain the same. Vlad _____ From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Mark Proctor Sent: 12 February 2007 19:16 To: Rules Users List Subject: Re: [rules-users] calls to 'Helper' classes in LHS - are they allowed? We were hoping the community would work with us and improve the documentation over the last year - to date we have had zip :( We will have another documentation drive once we get to the candidate release stage for the current development cycle. We simply don't have the cycles to work on a book, with any luck after we spend 3 to 4 weeks on documentation during hte candidate release stage it should get better, and maybe one day the manual can form the basis of a book. Some ideas for the community to work include the examples in drools-examples, they can even use what I did for drools 2.x as a starting basis, or to provide a really good tutorial on the basics of pattern matching, you can look the public domain clips manual for pointers here. It's not money we need, its time, YOUR time :) If you want to use a helper class it must be in a return value, predicate or eval - none of which are currently indexed. return value and predicate must also be time constant, eval does not have to be. Mark Michael Suzio wrote: I see this in the docs: "A d0e1997Predicate constraint can use any valid Java expression as long as it evaluated to a primitive boolean - avoid using any Drools keywords as Declaration identifiers. Previously bound declarations can be used in the expression. Functions used in a Predicate Constraint must return time constant results." and under the discussion of 'eval': "Evals cannot be indexed and thus are not as optimal as using Field Constraints." and this in general discussion of constraints and accessors of your objects used in them: "Do please make sure that you are accessing methods that take no parameters, and are in-fact "accessors" (as in, they don't change the state of the object in a way that may effect the rules - remember that the rule engine effectively caches the results of its matching inbetween invocations to make it faster)." So, if invoking a helper method is like an eval, I'm thinking Drools computes the match, but then throws it away because it knows this is not a constant expression. Whereas, if it were just a match of an accessor's value vs. a constant String, it could cache that. I'm wildly speculating, only because I want to understand fully what is happening, so I'm throwing stuff out there so the Drools team will have to correct my misapprehensions before I confuse the whole list (*g*). Sometimes reading the Drools documentation is like a Talmudic scholar trying to find the deeper meaning of the sacred words... as much as I want the 3.2 milestone, I want real documentation even more (and *hint hint* -- would probably be willing to pay for it, guys! Can we get an O'Reilly book?) --- Michael On 2/12/07, Steven Williams <stevenw(a)objectconsulting.com.au <mailto:stevenw@objectconsulting.com.au> > wrote: I believe there is a caveat on functions and helper methods called from the LHS that they need to be constant over time (or at least over the life of the working memory) which then allows matches to be computed as per normal. Steve On 2/13/07, Michael Suzio < <mailto:msuzio@gmail.com> msuzio(a)gmail.com> wrote: The JBoss guys can correct me if I'm wrong, but although I think that works, what you've just done is eliminate any chance to precompute matches and trim down the checks that need to happen to find a rule match. Since the engine can't know that Helper.transform("value") returns a constant value, it has to re-run that every time and it has to reject for matches to the rule constraint every time. I'm sure this would really sink performance, in other words. You can easily see the effect -- write the rule this way and time it, and then write it with the return value of Helper.transform being inlined, and I'm sure there's a big difference. It's the same as any other eval(...) situation in Drools; possible, but not good for performance. On 2/12/07, Olenin, Vladimir (MOH) <Vladimir.Olenin(a)moh.gov.on.ca <mailto:Vladimir.Olenin@moh.gov.on.ca> > wrote: Hi, I was wondering if calls to a Helper class are allowed in LHS of the rule? Eg: Rule myRule When MyObject(objField == Helper.transform("value")) Then // smth End Thanks, Vlad _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org> https://lists.jboss.org/mailman/listinfo/rules-users <https://lists.jboss.org/mailman/listinfo/rules-users> _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org> https://lists.jboss.org/mailman/listinfo/rules-users <https://lists.jboss.org/mailman/listinfo/rules-users> -- Steven Williams Supervising Consultant Object Consulting Office: 8615 4500 Mob: 0439 898 668 Fax: 8615 4501 stevenw(a)objectconsulting.com.au <mailto:stevenw@objectconsulting.com.au> www.objectconsulting.com.au <http://www.objectconsulting.com.au> consulting | development | training | support our experience makes the difference _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org> https://lists.jboss.org/mailman/listinfo/rules-users <https://lists.jboss.org/mailman/listinfo/rules-users> _____ _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org> https://lists.jboss.org/mailman/listinfo/rules-users <https://lists.jboss.org/mailman/listinfo/rules-users>

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Re: [rules-users] Roll Back Rule / Rule Transactions?

by Andrew Thompson

Probably you want to make sure you understand the difference between assert() and assertLogical() and see if that will meet your needs. -- Andrew Thompson ----- Original Message ---- From: Matt Johnston <MJohnston(a)pubgroup.com> To: rules-users(a)lists.jboss.org Sent: Tuesday, February 13, 2007 11:20:35 AM Subject: [rules-users] Roll Back Rule / Rule Transactions? I am working on rules for an online shopping cart. Depending on the products in the cart, the customer may get certain discounts. If cart contains a TV, add a free VCR. I can apply these rules, but what about rolling them back? So in the example above, the rule automatically added a free VCR because the cart contained a TV. If the customer removes the TV, I need to roll back the VCR rule and also remove the VCR from the cart. Does anyone know how to do this? Is it possible? Matt Johnston Manager of Internet Content Publishing Group of America p: 615-468-6053 f: 615-468-6153 _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users ____________________________________________________________________________________ Sucker-punch spam with award-winning protection. Try the free Yahoo! Mail Beta. http://advision.webevents.yahoo.com/mailbeta/features_spam.html

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Roll Back Rule / Rule Transactions?

by Matt Johnston

I am working on rules for an online shopping cart. Depending on the products in the cart, the customer may get certain discounts. If cart contains a TV, add a free VCR. I can apply these rules, but what about rolling them back? So in the example above, the rule automatically added a free VCR because the cart contained a TV. If the customer removes the TV, I need to roll back the VCR rule and also remove the VCR from the cart. Does anyone know how to do this? Is it possible? Matt Johnston Manager of Internet Content Publishing Group of America p: 615-468-6053 f: 615-468-6153

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RE: [rules-users] Roll Back Rule / Rule Transactions?

by Olenin, Vladimir (MOH)

NOTE: I'm not a DROOL expert. Keeping this in mind, I'd say.... You'd need a separate rule which states: - if a cart does NOT contain TV, remove any free VCR from the cart if any Once you retract the 'TV' fact from WorkingMemory and refire the rules (or they will automatically refire?), this new rule will be activate and remove the free VCR from the cart. Just my 2c... Vlad -----Original Message----- From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Matt Johnston Sent: 13 February 2007 11:21 To: rules-users(a)lists.jboss.org Subject: [rules-users] Roll Back Rule / Rule Transactions? I am working on rules for an online shopping cart. Depending on the products in the cart, the customer may get certain discounts. If cart contains a TV, add a free VCR. I can apply these rules, but what about rolling them back? So in the example above, the rule automatically added a free VCR because the cart contained a TV. If the customer removes the TV, I need to roll back the VCR rule and also remove the VCR from the cart. Does anyone know how to do this? Is it possible? Matt Johnston Manager of Internet Content Publishing Group of America p: 615-468-6053 f: 615-468-6153 _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

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Example of contains operator...

by jdepaul

Could someone post an example or a link that shows how to use the "contains" operator... HEre's the scenario: I've got the following class that has partnerList collection of Partner objects - the partnerList is a HashMap keyed by partnerID: public class GateOut { private String portID; private Map partnerList; <-- Collection... .. } public class Partner { private String partnerId; private String partnerName; private int purpose; .. } Need to write a rule that will determine if a specific PartnerID exists in the partnerList HashMap. Could you please point me to an example? The documentation example listed is unclear to me... thanks - james -- View this message in context: http://www.nabble.com/Example-of-contains-operator...-tf3202978.html#a889... Sent from the drools - user mailing list archive at Nabble.com.

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RE: [rules-users] fact tuples selection - what are the principles - a bit confused?

by Olenin, Vladimir (MOH)

No, I'm not concerned with the order in this particular case - just trying to figure out what I should be taking into account or rely on when doing the design. Thanks for taking the time to go through (now that I scrolled through it myself :-) ) this quite lengthy email. Vlad _____ From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Michael Neale Sent: 12 February 2007 23:53 To: Rules Users List Subject: Re: [rules-users] fact tuples selection - what are the principles - a bit confused? that sounds correct. No you can't really depend on things happening in a certain order. of course it will be consistent between executions for the same data, but you can't count on that. It would mostly be effected by the order in which you assert facts. I guess the question is why are you concerned in what order it does things? Michael On 2/13/07, Olenin, Vladimir (MOH) < <mailto:Vladimir.Olenin@moh.gov.on.ca> Vladimir.Olenin(a)moh.gov.on.ca> wrote: Hi, I was trying to find more detailed explanation on how the fact tuples for activations are being selected based on the constraints, but couldn't find much. So, I guess I just want to assert my understanding of this process is correct. Assuming I have the following set of 'Accounts' with the fields: ID | Province | City | Type | Balance ---------------------------------------------------------------- 1 | ON | Toronto | Checking | 1000 2 | BC | Vancouver | Checking | 100 3 | ON | Toronto | Visa | 2000 4 | ON | Toronto | Checking |-100 5 | BC | Vancouver | Checking | 100 6 | BC | Vancouver | Visa | 150 7 | AB | Calgary | Checking | 100 7 | AB | Toronto | Checking | 300 I have two rules to process: 1) within each province, the sum of balances on Visa accounts should less then 10 times the sum of balances on Checking accounts (within the same province) 2) within each province, the sum of balances on Checking accounts should be a positive number 3) within each province and within each city, the number of visa accounts should be no more than 2 times the number of checking accounts If I model my business objects like this: 1) Account (id, province, city, type, balance) 2) Province (province) 3) City (province, city) And WorkingMemory will be initialized (for the data above) with: - 7 Account instances (ids 1 through 7) - 3 Province instances (ON, AB, BC) - 3 City instances (Toronto, Vancouver, Calgary) Then the rules containing 'within province' would read like: ----------------- Rule '1' When Province($prov: province) $a: Account(province == $prov) Then // accumulate sums on Checking and Visa accounts as Edson showed in previous emails End ----------------- The rule containing 'within province, within city' would have then: ------------- Rule '3' When Province($prov: province) City($city: city, province = $prov) $a: Account(province = $prov, city = $city) Then // accumulate sums on Checking and Visa accounts as Edson showed in previous emails ------------- Is this correct business object model to achieve the goal? Do I understand correctly that the LHS statement: Province($prov: province) City($city: city, province = $prov) $a: Account(province = $prov, city = $city) Can be read as: For each province For each city within the province For each account for the given city and province What 'guides' the order in which fact tuples are selected from the set of all facts in the WorkingMemory? Can any particular sequence be guaranteed? Thanks! Vlad _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org> https://lists.jboss.org/mailman/listinfo/rules-users <https://lists.jboss.org/mailman/listinfo/rules-users>

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decision tables and 'default' or 'else' conditions

by Joost de Vries

Hi, We're using excel decision tables to specify our business rules. In one column we enumerate several condition values and describe a specific effect. We'd like to offer business analysts te possibility of describing succinctly what the effect is 'for all other values'. That could be described as an 'else' or 'default' rule. In other words; we don't want to burden business analysts with the necessity to enumerate all other values. What is the right way to do that? Thanks for you help. groetjes, Joost

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RE: [rules-users] Help Needed

by shilpa.raghavendra＠wipro.com

Thanks a lot Steve it worked fine. I need some more information on Agenda Groups. How we can use and which scenario we can issue? Thanks & Regards Shilpa -----Original Message----- From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Steven Williams Sent: Tuesday, February 13, 2007 9:21 AM To: Rules Users List Subject: Re: [rules-users] Help Needed Hi Shilpa, You can pass your DAOs (or any other object) into the working memory as globals and then use them in the consequence of your rules. cheers Steve On 2/13/07, shilpa.raghavendra(a)wipro.com <shilpa.raghavendra(a)wipro.com> wrote: Hi, I am using Drools 3.0 in our business logic. I need help in the below situation I will take the records from the database on daily basis and each record is fact in the rule engine I will check the fact against some constant value; if it satisfies the condition then I need to update one field in the database. I am using Ibatis as DAO framework. How I can connect to database in ".drl" file? Please help me. Thanks & Regards Shilpa The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain proprietary, confidential or privileged information. If you are not the intended recipient, you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately and destroy all copies of this message and any attachments. WARNING: Computer viruses can be transmitted via email. The recipient should check this email and any attachments for the presence of viruses. The company accepts no liability for any damage caused by any virus transmitted by this email. www.wipro.com _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org> https://lists.jboss.org/mailman/listinfo/rules-users -- Steven Williams Supervising Consultant Object Consulting Office: 8615 4500 Mob: 0439 898 668 Fax: 8615 4501 stevenw(a)objectconsulting.com.au <mailto:stevenw@objectconsulting.com.au> www.objectconsulting.com.au consulting | development | training | support our experience makes the difference The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain proprietary, confidential or privileged information. If you are not the intended recipient, you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately and destroy all copies of this message and any attachments. WARNING: Computer viruses can be transmitted via email. The recipient should check this email and any attachments for the presence of viruses. The company accepts no liability for any damage caused by any virus transmitted by this email. www.wipro.com

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Need help on bringing up JBoss Rules Work Bench in Eclipse

by venkatesh devalapura nagabhushana

Hi, I am new to both Eclipse and JBoss Rules. I am trying to bring up The Rule Workbench (IDE) with eclipse, and i am lost ! I installed binary version of Jboss Rules (DROOLS 3.0.5) on my Linux (FC4) machine. I also, installed Eclipse 3.2. I have also downloaded JBoss Rules Plugin for Eclipse (org.drools.ide_3.0.5.jar) and I copied this jar file to plugins directory of eclipse (plugins sub-directory where I have installed eclipse). I stared Eclipse, but I don't seem to see anything happening - I mean I am not able to run the plugin (or there is no icon that relates to Jboss Rules) though i am able to see the jar file when i import the plugin. I am trying to get Let me know how to go it working. Thanks, Venkatesh The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain proprietary, confidential or privileged information. If you are not the intended recipient, you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately and destroy all copies of this message and any attachments. WARNING: Computer viruses can be transmitted via email. The recipient should check this email and any attachments for the presence of viruses. The company accepts no liability for any damage caused by any virus transmitted by this email. www.wipro.com

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rules-users February 2007