October 2008 - rules-users - Jboss List Archives

Re: not exists / forall(not) logically equivalent, behave differently

by tim tim

edson, thanks a lot for your answer. now i came to a new problem. i stated the rule as you said: rule "no dog without a tail" when $dog :Dog() not( Tail(dog == $dog) ) then // fire rule end but now, if i do workingMemory.insert(dog); workingMemory.insert(dog.getTail()); workingMemory.fireAllRules(); modifyRetract(dogHandle); dog.changeHashCode(); // do something that changes the hashCode of the dog modifyInsert(dogHandle); workingMemory.fireAllRules(); in the second fireAllRules() the rule fires, even though there is a tail for the dog. am i not allowed to do an opperation that changes the hashCode of the modified object between the modifyRetract() and modifyInsert() ? should i totally retract the object, and insert it again instead? thank you, tim > I believe there is an open ticket for a bug when using "not(exists())" in 5.0. I did not investigated yet, but I believe this is a regression in the new asymmetric matching algorithm in 5.0. Anyway, we will fix it before releasing the final version. > > Meantime, just use: > >not( Tail(dog == $dog) ) > > Since the "exists" is redundant there because "not" is the existential operator, not the "boolean" operator. > > []s > Edson 2008/10/6 tim tim <timbaermannextra@...> hello there, i have a rule, that should fire, when a required part of a whole is missing. lets say the whole is a dog, and the required part the tail. then the rule should fire, when there is a dog without a tail. i stated the rule in two logically equivalent ways. 1) when we have a dog, and all existing tails belong to other peoples dogs, the rule should fire: rule "no dog without a tail; forall" when $dog :Dog() forall($t : Tail() Tail(dog != $dog)) then // fire rule end 2) when we have a dog and no tail exists that belongs to this dog the rule should fire: rule "no dog without a tail; not exists" when $dog :Dog() not( exists( Tail(dog == $dog))) then // fire rule end and they really do behave similar, but not the same.. workingMemory.insert(dog); workingMemory.insert(dog.getTail()); workingMemory.fireAllRules(); // here both did not fire, but when i go on: workingMemory.modifyRetract(dogHandle) workingMemory.modifyInsert(dogHandle, dog) workingMemory.fireAllRules(); // now the not(exists(..)) version did fire, whereas the forall(..) version did not. of course both rules should not have fired, nothing changed for the dogs relationship with its tail. i am using the 5.0.0.snapshot version of drools but i can not imagine that this is an unknown bug, as this is rather basic predicate logic. what am i missing? best, tim

18 years

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Writing rules using java..

by Kolla, Sandeep

Hi Rahul, Its not about storing the whole file into the database. I would have a Table representing the parameteres required to construct a rule. For example. Tables: RuleSetTable: Ruleset_id Ruleset_name RuleTable: Rule_id Rule_name Rule_saliance Rule_condition Rule_consequence Ruleset_id Now while loading the rules the application basically should read from the DB, and construct the rules, as everything required to construct the rules is avaliable in the tables. This requirement had come up because as the rules keep changing quite frequently, we don't want to bring down the application to load a new DRL file. Hope you understood what I want to achieve. Thanks much, Sandeep.

18 years

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Salience guarantee

by Leonardo Figueiredo

Hi, Is it really guaranteed that an higher salience rule will fire before an lower one? Does anyone had any problem with that? The docs says: " The most visible one is "salience" or priority, in which case a user can specify that a certain rule has a higher priority (by giving it a higher number) than other rules. In that case, the higher salience rule will always be preferred" I have to simulate a sort of activation group where the rules in the group can only fire exclusively per object and does not influence firing rules outside the group. I am using salience as part of the solution. Regards, Leo

18 years

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RV: [rules-users] Checking an xml field

by Otaduy del Paso, Zaloa

Does anybody know the answer to my question? I'm not able to solve this issue and don't find any clarifying tutorial either.... Hi, I'm new in drools and I'm having some problems accessing an xml field. I'm using drools with jaxb to treat xml files that follow an specific xsd. I have the following xml (this is just a piece of the xml): <OASIS_TSO_1_0> <EVENT> <EVENT_ID>EVENT_ID_03/10/2008 10:22:36</EVENT_ID> <NODE_ID>00</NODE_ID> <OTHER_EVENT_ID>Incidente UME</OTHER_EVENT_ID> <EVENT_TYPE>POL</EVENT_TYPE> <SOURCE>HUMDED</SOURCE> <SEVERITY>EXTREM</SEVERITY> <CERTAINTY>88</CERTAINTY> <DECL_DATIME>2008-10-03T10:20:47.0000000+02:00</DECL_DATIME> <GEO> <DESCRIPTION/> <POSITION> <LOC_ID>14021</LOC_ID> <COORD> <LAT>37.9811636567434</LAT> <LON>-4.85417587343286</LON> <HEIGHT>0</HEIGHT> </COORD> </POSITION> </GEO> </EVENT> </OASIS_TSO_1_0> I already have a couple of rules working, but they are simple rules, like this one: rule "Rule1" salience 10 when OASISTSO10($e: EVENT) OASISTSO10($e.SEVERITY == "EXTREM") or OASISTSO10($e.SEVERITY == "SEVERE") then action The problem appears when I have to check the LOC_ID field and I don't know how to access to it. I have tried several things but none of them work 1. when OASISTSO10($e: EVENT) OASISTSO10($e.GEO.POSITION.LOCID == "40005") then 2. when OASISTSO10($e: EVENT) OASISTSO10($g: $e.GEO) OASISTSO10($p: $g.POSITION) OASISTSO10($p.LOCID == "40005") Then I have also tried with ($e.GEO.POSITION.DESCRIPTION, just in case the "_" character was the problem. But the same results... I have searched also for examples with xmls but I haven't had luck. Any help would be appreciated. Thanks in advance, Zaloa _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

18 years

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import/upload package

by hongyu lu

Hi, in drl, is there a way to specify whether a rule should go into business rule asset or tech rule asset after import? and what about category info(doesn't look like you can specify that part of info in drl)? thanks Jeff

18 years

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Backward Chaining Support

by Sangrish

Hi this question has been asked previously but it has been answered as "the next major release will have backward chaining". Drools Wiki doesn't mention backward chaining. So, does all of it mean that Drools doesn't have backward chaining as of now? Thanks Siddharth -- View this message in context: http://www.nabble.com/Backward-Chaining-Support-tp19868619p19868619.html Sent from the drools - user mailing list archive at Nabble.com.

18 years

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different behavior in Eclipse vs. command line

by Charles Binford

This is related to yesterday's post titled "trouble dynamically changing packages of a rulebase". I decided to try and reduce the problem down as much as possible so I started with "Hello World" program automatically created with Eclipse when you create a new Drools Project. I modified the program to do the following additional work: 1. unload the pkg 2. add a second pkg to the same rulebase * (new rule set is same, except is uses the string "So long" instead of "Goodbye") 3. - create new session 4. - add new facts to the new session * (this time I use the word "Welcome" instead of "Hello") 5. - fireall rules When I run within Eclipse, I get: Hello World Goodbye cruel world Goodbye cruel world Welcome World So long cruel world Notice that the Goodbye line comes out twice. The second time is printed when I single step (in the eclipse debugger) over the line ruleBase.addPackage( pkg ); in step 2 above. When I run from the command line I don't get the extra line ("javadr" is just a one line shell script that has all of the drools classpath stuff specified). javadr com/sample/DroolsTest Hello World Goodbye cruel world Welcome World So long cruel world I don't know of this is related to my real issue (see yesterday's post) or not. The similarity is that BOTH BEHAVE DIFFERENTLY when run under Eclipse vs. command line. Here is the portion of the src that shows what I added/modified.... // Now try second set of rules readRule2("/Sample2.drl", "com.sample"); workingMemory = ruleBase.newStatefulSession(); message.setMessage( "Welcome World" ); message.setStatus( Message.HELLO ); workingMemory.insert( message ); workingMemory.fireAllRules(); private static RuleBase readRule2(String file, String remPkgName) throws Exception { //read in the source Reader source = new InputStreamReader( DroolsTest.class.getResourceAsStream( file ) ); PackageBuilder builder = new PackageBuilder(); builder.addPackageFromDrl( source ); Package pkg = builder.getPackage(); if (remPkgName != null) { ruleBase.removePackage(remPkgName); } ruleBase.addPackage( pkg ); return ruleBase; }

18 years

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trouble dynamically changing packages of a rulebase

by Charles Binford

I'm using 4.07. Sorry for the long winded post but I was trying to give enough background and code snippets to be useful. The way I'm running data through drools is in a batch mode. As I've gained more experience I see that my app may be better suited for the stateless mode, but for now I'm still running stateful. A "batch" consists of: - loop on array of objects calling session.insert(a, true); // then I save off the factHandle - session.fireAllRules(); - loop on array of objects calling session.retract(factHandle); All has worked fine until I attempted to add the ability to dynamically update a rule package. It worked both under Eclipse, and running just "java -jar myCompiledApp.jar". My application has rules split into two parts. Part A (adm.rules) is static and contains the logic tied directly to the application. Part B (adm.userrules) is the user half of the rules where the application can be customized to fit the user. After adding the logic to dynamically add the user rules all appears to work fine when run in eclipse. BUT when I run outside of eclipse (i.e. java -jar ....) it doesn't work. Only part of my static rules fire. Here is the code snippet that dynamically loads the new package: pkg = pMgr.buildDslPackage(rule_str, dsl_def_file); if (userRulesLoaded) { Package pkgA[] = ruleBase.getPackages(); for (Package p : pkgA) { System.out.println("LOADED: " + p.getName()); } System.out.println("Removing: " + UserXmlRulesToDrls.getUserRulesPackageName()); pMgr.removePackage(ruleBase, UserXmlRulesToDrls.getUserRulesPackageName()); } System.out.println("Adding: " + pkg.getName()); pMgr.addPackage(ruleBase, pkg); pMgr.createSession(ruleBase); userRulesLoaded = true; } pMgr.addPackage, createSession, etc. are small wrappers: public void createSession(RuleBase ruleBase) { if (session != null) { session.dispose(); } session = ruleBase.newStatefulSession(); } public void addPackage(RuleBase ruleBase, Package pkg) throws Exception { ruleBase.addPackage(pkg); } public void removePackage(RuleBase ruleBase, String pkgName) { ruleBase.removePackage(pkgName); } Here are a couple of dummy rules I added in an attempt to debug this. These are from the static "adm.rules" package: rule "testme" when $ar : ActionArchive(); then System.out.println("Archive: " + $ar.getFile().getFullPath()); end rule "testme2" when $f : File(); then System.out.println("File: " + $f.getFullPath()); end I always get the "archive" print (as expected), but never get the "File" print after the first dynamically set of user rules (the first load works, second and subsequent loading of user rules doesn't). My user rules also have a "when" based on File() and it always works as expected. Last, here is some sample output, running the exact same set of input through each time. Each set does two things: 1. load a set of user rules 2. execute a "batch" of a single file bash-3.2# /usr/jdk/instances/jdk1.6.0/bin/java -jar admDrools.jar com.sun.evtl.pe.customerPolicy.adm.rules Adding: com.sun.evtl.pe.customerPolicy.adm.userrules ArchiveRdy: /zp1/fs2/23kd Mask WFC: /zp1/fs2/23kd File: /zp1/fs2/23kd Archive: /zp1/fs2/23kd <<< end of first run, all OK LOADED: com.sun.evtl.pe.customerPolicy.adm.rules LOADED: com.sun.evtl.pe.customerPolicy.adm.userrules Removing: com.sun.evtl.pe.customerPolicy.adm.userrules Adding: com.sun.evtl.pe.customerPolicy.adm.userrules Archive: /zp1/fs2/23kd <<< end of second run, missing "File", "Mask", and "ArchiveRdy" statements LOADED: com.sun.evtl.pe.customerPolicy.adm.rules LOADED: com.sun.evtl.pe.customerPolicy.adm.userrules Removing: com.sun.evtl.pe.customerPolicy.adm.userrules Adding: com.sun.evtl.pe.customerPolicy.adm.userrules Archive: /zp1/fs2/23kd <<< end of third run, again; missing "File", "Mask", and "ArchiveRdy" statements Charles Binford

18 years

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JSR94 and compiled packages

by Keller, Kristopher

I know that the JSR94 interface can consume a DRL file but can it start with a precompiled package from BRMS or output of ant compilation? Can we only consume compiled packages with the native drools API (RuleAgent)? My company is exploring replacing Blaze Advisor with the JBOSS Rules engine. We are currently testing with 4.0.7 but would move to an early release of 5.x if we need to. If there is any documentation or another thread that someone could point me to that would be great. Kris Keller Fidelity Information Services 678-455-7184 _____________ The information contained in this message is proprietary and/or confidential. If you are not the intended recipient, please: (i) delete the message and all copies; (ii) do not disclose, distribute or use the message in any manner; and (iii) notify the sender immediately. In addition, please be aware that any message addressed to our domain is subject to archiving and review by persons other than the intended recipient. Thank you. _____________

18 years

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listen to package polling event

by hongyu lu

Hi, is there a way to listen to the package polling event? there are some operations need to happen in our app each time the rule package is refreshed from the server. thanks Jeff

18 years

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rules-users October 2008