Drool rules vs java code, effiency
by kina06
Please don't ignore this question as routine, did google and read posting,
didn't get satisfying answer, hope you guys can help.
I have seen some drool rules in our company, I know drools provide
declarative rules, easy to modify etc etc, but I see it does need some
programming knowledge, so why not put all your rule logic into Java code,
what is drools doing different can't be implemented in Java a separate
package (like your logic package). Except losing flexibility of modify
code/logic in text file I don't see much benefit.
Please help me understand, whats the major benefit of drools rules that
can't be done in Java with same set of concise code.
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13 years, 4 months
errors compiling resources (returns a null package)
by Cotton, Ben
Hi,
I am extending the Drools 5.4 templates example (which uses Cheese.drt and ExampleCheese.xls) in effort to learn how to generate a .DRL generically (from my .drt and my .xls).
I am getting these errors:
Error compiling resources:
[ERR 101] Line 7:56 no viable alternative at input '==' in rule "IRS_CURRENCY_RULE_FR_REPOSITORYMOCK_TEMPLATE"
[ERR 101] Line 35:56 no viable alternative at input '==' in rule "IRS_CURRENCY_RULE_FR_REPOSITORYMOCK_TEMPLATE"
Parser returned a null Package
Exception in thread "main" java.lang.IllegalStateException: Error compiling resources
at com.ms.fast.triclear.eligibility.rules.GenerateDRLfromEligibilityRulesRepoViaDRT.buildKBase(GenerateDRLfromEligibilityRulesRepoViaDRT.java:81)
at com.ms.fast.triclear.eligibility.rules.GenerateDRLfromEligibilityRulesRepoViaDRT.executeExample(GenerateDRLfromEligibilityRulesRepoViaDRT.java:39)
at com.ms.fast.triclear.eligibility.rules.GenerateDRLfromEligibilityRulesRepoViaDRT.main(GenerateDRLfromEligibilityRulesRepoViaDRT.java:33)
I wouldn't dare ask anyone on this list to explicitly help debug this for me, however - I have no idea what Line 7:56 and Line 35:56 could be referring to - Line &:56 of what? Could anyone supply some general insight as to what might be problematic?
Thanks, Ben
Ben D Cotton III
Morgan Stanley & Co.
OTC Derivatives Clearing Technology
1221 AOTA Rockefeller Ctr - Flr 27
New York, NY 10020
(212)762.9094
ben.cotton(a)ms.com<mailto:ben.cotton@ms.com>
________________________________
NOTICE: Morgan Stanley is not acting as a municipal advisor and the opinions or views contained herein are not intended to be, and do not constitute, advice within the meaning of Section 975 of the Dodd-Frank Wall Street Reform and Consumer Protection Act. If you have received this communication in error, please destroy all electronic and paper copies and notify the sender immediately. Mistransmission is not intended to waive confidentiality or privilege. Morgan Stanley reserves the right, to the extent permitted under applicable law, to monitor electronic communications. This message is subject to terms available at the following link: http://www.morganstanley.com/disclaimers If you cannot access these links, please notify us by reply message and we will send the contents to you. By messaging with Morgan Stanley you consent to the foregoing.
13 years, 4 months
Drools planner: unbreakable constraint question
by Michiel Vermandel
Hi,
I have a planning project that is determined by quite some constraints.
Translated in rules this results in a number of hard constraints and a number of soft constraints.
Now I have one rule (hard constraint) that simply many not be broken, never, ever.
If a planning that fails this rule would be executed, we face a lawsuit.
Of course I can (and will) do a post-evaluation to find out if this rule is broken,
but I want to know if there is a possibility in drools planner to forcefully reject any "solution" that breaks this one rule,
continue searching for other solutions and guarantee that the "best solution" will not propose a combination that fails this rule?
Is this possible?
Thanks,
Michiel
-----------------
http://www.codessentials.com - Your essential software, for free!
Follow us at http://twitter.com/#!/Codessentials
13 years, 4 months
Intercept event handling / why rule salience does not affect execution order?
by jpullmann
Hello,
in my scenario part of the KB is managed by means of "command events".
Rules with a low salience consume these events, assert, modify or retract
facts and remove the command event afterwards. Rules from separate files
with a higher salience are expected to transparently intercept handling
of these commands, but regardless of conditions like read order, salience
value the intercepting rules are called (or not) in an unpredictable
manner.
Example default handler:
rule "Create finite context"
salience -10
when
$start : StartCommand( time < endTime ) from entry-point
"events/context"
not( Context( name == $start.name ) )
then
insert(new TemporalContext( $start.getName(), $start.getTime(),
$start.getEndTime() ));
retract($start);
end
Example intermediary handler:
rule "Intercept context creation"
salience 10
when
$start : StartCommand() from entry-point "events/context"
not( Context( name == $start.name ) )
then
System.out.println( "Context creation intercepted: "+$start);
end
While this roughly worked with Drools 5.4, the results vary significantly
in Drools 5.5.0* for every test run. The salience attribute alone
apparently
does not guarantee for proper invocation of the intermediary handlers ?
Thank you
Jaro
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13 years, 4 months
Probable bug when using two knowledge bases and one declarative model between
by Jackson Cunha
Hello conrads.
To explain what I need, the problem that I found and the solution that I
planning to use, I will firstly describe my cenario.
*Cenario*
In my cenario, I have a declarative model and rules of different groups. I
need put each rules group in a different knowledge base and all of it will
share the same declarative model.
In a time, I will create a fact using fact types defined in a knowledge
base that I will call as kbaseModel. This knowledge base will have only the
declarative model and no rules.
All facts created will be used in other knowledge base, called kbaseRules.
All kbaseRules have only rules and no declarative model, because model was
defined in kbaseModel.
I could have many kbaseRules but exists only one kbaseModel.
Using the Drools API, teoricaly, I could implement my cenario using the
following code:
//DRL for resourceModel
declare MyEntity
name : String
end
//DRL for resourceRules
rule "Simple Rule"
when
$entity: MyEntity()
then
System.out.println($entity)
end
Resource resourceModel = ... //Resource with only the declarative model and
no rules
Resource resourceRules = ... //Resource with only rules and no declarative
model
KnowledgeBuilder kbuilderModel =
KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilderModel add(resourceModel, ResourceType.DRL);
KnowledgeBase kbaseModel = kbuilderModel.newKnowledgeBase();
KnowledgeBuilder kbuilderRules =
KnowledgeBuilderFactory.newKnowledgeBuilder(kbaseModel);
kbuilderRules.add(resourceRules, ResourceType.DRL);
KnowledgeBase kbaseRules = KnowledgeBaseFactory.newKnowledgeBase();
kbaseRules.addKnowledgePackages(kbuilderRules.getKnowledgePackages());
FactType factType = kbaseModel.getFactType("mymodel", "MyEntity");
Object myEntity = factType.newInstance();
factType.set(myEntity, "name", "Jackson Cunha Cassimiro");
StatelessKnowledgeSession session =
kbaseRules.newStatelessKnowledgeSession();
session.execute(myEntity);
This code should work, but when I try to run I get this stacktrace:
java.lang.ClassNotFoundException: Unable to load class: mymodel.MyEntity
at
org.drools.util.CompositeClassLoader.loadClass(CompositeClassLoader.java:92)
at
org.drools.common.AbstractRuleBase.registerAndLoadTypeDefinition(AbstractRuleBase.java:649)
at
org.drools.common.AbstractRuleBase.addPackages(AbstractRuleBase.java:553)
at org.drools.reteoo.ReteooRuleBase.addPackages(ReteooRuleBase.java:472)
at
org.drools.impl.KnowledgeBaseImpl.addKnowledgePackages(KnowledgeBaseImpl.java:150)
at app.UsingDeclares.main(UsingDeclares.java:79)
Exception in thread "main" org.drools.RuntimeDroolsException: unable to
resolve Type Declaration class 'mymodel.MyEntity'
at
org.drools.common.AbstractRuleBase.addPackages(AbstractRuleBase.java:582)
at org.drools.reteoo.ReteooRuleBase.addPackages(ReteooRuleBase.java:472)
at
org.drools.impl.KnowledgeBaseImpl.addKnowledgePackages(KnowledgeBaseImpl.java:150)
at app.UsingDeclares.main(UsingDeclares.java:79)
It happens because Drools can't find any reference of mymodel.MyEntity in
kbaseRules, but this kbase was built from kbaseModel that already have this
class declared. *I think it can be a **bug*.
*Debuging*
During creation of kbaseModel, a method called mergePackage(pkgRegistry,
packageDescr) from PackageBuilder class is invoked. The pkgRegistry not
contains any reference to declarative model. The packageDescr contains a
list of type definitions from declarative model. Inside mergePackage is
invoked other method, called processTypeDeclarations(pkgRegistry,
packageDescr) that will iterate over all type definitions from
packageDescrand will fill a map called Map<String,byte[]>
classLookups from JavaDialectRuntimeData class.
During the creation of kbaseRules the method mergePackage(pkgRegistry,
packageDescr) from PackageBuilder is invoked again, but at this time
pkgRegistry contains all type definitions defined previously in kbaseModeland
packageDescr not contains any type definitions, only rules. When the
method processTypeDeclarations(pkgRegistry,
packageDescr) from PackageBuilder is called and try iterate over type
definitions of packageDescr, this is empty and nothing is done and the
map Map<String,byte[]>
classLookups from JavaDialectRuntimeData will be empty too.
*The classLookups empty is the cause of ClassNotFoundException*.
*Solution*
The solution that I found was apply reflection to fill Map<String,byte[]>
classLookups from JavaDialectRuntimeData correctly before add the packages
into kbaseRules:
Collection<KnowledgePackage> packages =
kbuilderRules.getKnowledgePackages();
Mirror mirror = new Mirror();//Reflection utilities
for (KnowledgePackage kPackage : packages) {
Package pkg = (Package) mirror.on(kPackage).get().field("pkg");
JavaDialectRuntimeData dialect = (JavaDialectRuntimeData)
pkg.getDialectRuntimeRegistry().getDialectData( "java" );
for (FactType factType : kPackage.getFactTypes()) {
Class<?> c = factType.getFactClass();
String className = c.getName();
String classAsPath = className.replace('.', '/') + ".class";
InputStream stream =
c.getClassLoader().getResourceAsStream(classAsPath);
byte[] bytes = IOUtils.toByteArray(stream);
dialect.putClassDefinition(classAsPath, bytes);
}
}
KnowledgeBase kbaseRules = KnowledgeBaseFactory.newKnowledgeBase();
kbaseRules.addKnowledgePackages(packages);
----------------------------------------------------------------------------------------------------------------
Jackson Cunha Cassimiro (CereB)
Bacharel em Ciencia da Computação - UFPI
MSN: jackson.cereb(a)gmail.com
Telefone Móvel +55 86 9928 1251
Analista de Sistemas - Infoway - http://www.infoway-pi.com.br
Missão Infoway - "Influenciar a Gestão de Sistemas de Saúde através de
e-health"
("A vida é um combate que os fracos abate, aos bravos, aos fortes só pode
exaltar" - Canção do Tamoio, Gonçalves Dias)
----------------------------------------------------------------------------------------------------------------
13 years, 4 months
refactoring "complex" conditon to use "in" operator
by Cotton, Ben
Hi,
The following rule is working well.
rule "foo"
when
Message(_initialStubRate == "1.0") ||
Message(_initialStubRate == "2.0") || (
Message(_initialStubRate >= "4.0") &&
Message(_initialStubRate <= "44.0")
) ||
Message(_initialStubRate == "52.0")
then
System.out.println("foo");
End
To make this logic more amenable to being generically rendered via .DRT template, I want to simplify this rule . Consider the following re-factoring.
rule "bar"
when
Message(_initialStubRate in (
'1.0',"2.0",
"4.0","5.0","6.0","7.0","8.0","9.0","10.0", "11.0", "12.0","13.0",
"14.0","15.0","16.0","17.0","18.0","19.0","20.0", "21.0", "22.0","23.0",
"24.0","25.0","26.0","27.0","28.0","29.0","30.0", "31.0", "32.0","33.0",
"34.0","35.0","36.0","37.0","38.0","39.0","40.0", "41.0", "42.0","43.0",
"44.0",
"52.0")
)
then
System.out.println("bar");
end
This re-facotred rule produces a syntax error in Eclipse's .DRL view.
BuildError: Unable to Analyse Expression _initialStubRate == "1.0" || _initialStubRate == "2.0" || _initialStubRate == "4.0" || _initialStubRate == "5.0" || _initialStubRate == "6.0" || _initialStubRate == "7.0" || _initialStubRate == "8.0" || _initialStubRate == "9.0" || _initialStubRate == "10.0" || _initialStubRate == "11.0" || _initialStubRate == "12.0" || _initialStubRate == "13.0" || _initialStubRate == "14.0" || _initialStubRate == "15.0" || _initialStubRate == "16.0" || _initialStubRate == "17.0" || _initialStubRate == "18.0" || _initialStubRate == "19.0" || _initialStubRate == "20.0" || _initialStubRate == "21.0" || _initialStubRate == "22.0" || _initialStubRate == "23.0" || _initialStubRate == "24.0" || _initialStubRate == "25.0" || _initialStubRate == "26.0" || _initialStubRate == "27.0" || _initialStubRate == "28.0" || _initialStubRate == "29.0" || _initialStubRate == "30.0" || _initialStubRate == "31.0" || _initialStubRate == "32.0" || _initialStubRate == "33.0" || _initialStubRate == "34.0" || _initialStubRate == "35.0" || _initialStubRate == "36.0" || _initialStubRate == "37.0" || _initialStubRate == "38.0" || _initialStubRate == "39.0" || _initialStubRate == "40.0" || _initialStubRate == "41.0" || _initialStubRate == "42.0" || _initialStubRate == "43.0" || _initialStubRate == "44.0" || _initialStubRate == "52.0":
[Error: no such identifier: _initialStubRate]
[Near : {... _initialStubRate == "1.0" || _ ....}]
^
[Line: 1, Column: 1]
What could be wrong?
Ben D Cotton III
Morgan Stanley & Co.
OTC Derivatives Clearing Technology
1221 AOTA Rockefeller Ctr - Flr 27
New York, NY 10020
(212)762.9094
ben.cotton(a)ms.com<mailto:ben.cotton@ms.com>
________________________________
NOTICE: Morgan Stanley is not acting as a municipal advisor and the opinions or views contained herein are not intended to be, and do not constitute, advice within the meaning of Section 975 of the Dodd-Frank Wall Street Reform and Consumer Protection Act. If you have received this communication in error, please destroy all electronic and paper copies and notify the sender immediately. Mistransmission is not intended to waive confidentiality or privilege. Morgan Stanley reserves the right, to the extent permitted under applicable law, to monitor electronic communications. This message is subject to terms available at the following link: http://www.morganstanley.com/disclaimers If you cannot access these links, please notify us by reply message and we will send the contents to you. By messaging with Morgan Stanley you consent to the foregoing.
13 years, 4 months
physically view the .DRL file generated by .DRT?
by Cotton, Ben
Section 2.4.7 of the Drools Expert User's Guide shows how to generate a .DRL from an .XLS rules base via .drt template processing. Is this generated .DRL representation physically generated as a real .DRL file in the file system Or is it logically generated in the runtime and not physically written to the underlying file system?
Ben D Cotton III
Morgan Stanley & Co.
OTC Derivatives Clearing Technology
1221 AOTA Rockefeller Ctr - Flr 27
New York, NY 10020
(212)762.9094
ben.cotton(a)ms.com<mailto:ben.cotton@ms.com>
________________________________
NOTICE: Morgan Stanley is not acting as a municipal advisor and the opinions or views contained herein are not intended to be, and do not constitute, advice within the meaning of Section 975 of the Dodd-Frank Wall Street Reform and Consumer Protection Act. If you have received this communication in error, please destroy all electronic and paper copies and notify the sender immediately. Mistransmission is not intended to waive confidentiality or privilege. Morgan Stanley reserves the right, to the extent permitted under applicable law, to monitor electronic communications. This message is subject to terms available at the following link: http://www.morganstanley.com/disclaimers If you cannot access these links, please notify us by reply message and we will send the contents to you. By messaging with Morgan Stanley you consent to the foregoing.
13 years, 4 months
regarding JBOSS Clustering
by Athul K
I was trying to cluster a jboss 5.1 server locally with the nodes under the
same instance
After the configuration changes one of the server is working fine
While starting the second server startup is getting stuck at this point
Kindly let me know if anywhere else do I have to make the changes.
---------------------------------------------------------
GMS: address is 127.0.0.1:55400 (cluster=DefaultPartition)
---------------------------------------------------------
17:22:02,255 INFO [PlatformMBeanServerRegistration] JBossCache MBeans were
successfully registered
to the platform mbean server.
17:22:02,318 INFO [STDOUT]
---------------------------------------------------------
GMS: address is 127.0.0.1:55400 (cluster=DefaultPartition-HAPartitionCache)
---------------------------------------------------------
--
Thanks and Regards
Athul
13 years, 4 months
Clustered Guvnor performance issue
by worldofprasanna
Hi,
We have set the clustered environment with 2 nodes for guvnor and we used
Oracle Database as journal. We are experiencing performance issues, like
even to navigate between the cells in decision table it takes avg of 5-7
secs.
We followed the guidelines given in jackrabbit site to set up the clustered
repository and the link is,
http://wiki.apache.org/jackrabbit/Clustering
We doubt whether this clustering is the cause for this performance issue coz
we didn t find any issues in the forum related to the performance of Guvnor
? Can anyone give recommended procedure for clustering guvnor. We found that
there is a task to create cluster repository, but didn t find much
information about drools-ant task. Can we get some example for configuring
drools-ant ?
Also can we know whether there will be any difference in performance if File
Journal is used instead of Database Journal? There ll not be concurrent
access to both the guvnor application.
Thanks,
Prasanna Venkataraman.
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13 years, 4 months
Decision table loading : java.lang.VerifyError
by Mahadevappa, Shobha
Hi,
Can anybody please throw some light on this error. I am not sure why I am getting this?
java.lang.VerifyError: (class: com/keane/nREAP/util/generatedclasses/Rule_VerificationAShobha_13_0, method: defaultConsequence signature: (Lorg/drools/spi/KnowledgeHelper;Lcom/keane/nREAP/util/generatedclasses/LOG1;Lorg/drools/FactHandle;)V) Incompatible object argument for function call
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2427)
at java.lang.Class.getDeclaredMethods(Class.java:1791)
at org.codehaus.janino.ReflectionIClass.getDeclaredIMethods2(ReflectionIClass.java:65)
at org.codehaus.janino.IClass.getDeclaredIMethods(IClass.java:111)
at org.codehaus.janino.IClass.getDeclaredIMethods(IClass.java:130)
at org.codehaus.janino.UnitCompiler.getIMethods(UnitCompiler.java:5962)
at org.codehaus.janino.UnitCompiler.findIMethod(UnitCompiler.java:5919)
at org.codehaus.janino.UnitCompiler.findIMethod(UnitCompiler.java:5862)
at org.codehaus.janino.UnitCompiler.compileGet2(UnitCompiler.java:3124)
at org.codehaus.janino.UnitCompiler.access$6300(UnitCompiler.java:108)
at org.codehaus.janino.UnitCompiler$10.visitMethodInvocation(UnitCompiler.java:2579)
at org.codehaus.janino.Java$MethodInvocation.accept(Java.java:2650)
at org.codehaus.janino.UnitCompiler.compileGet(UnitCompiler.java:2599)
at org.codehaus.janino.UnitCompiler.compileGetValue(UnitCompiler.java:3535)
at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:2084)
at org.codehaus.janino.UnitCompiler.access$3800(UnitCompiler.java:108)
at org.codehaus.janino.UnitCompiler$7.visitMethodInvocation(UnitCompiler.java:2058)
at org.codehaus.janino.Java$MethodInvocation.accept(Java.java:2650)
at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:2078)
at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:1184)
at org.codehaus.janino.UnitCompiler.access$800(UnitCompiler.java:108)
at org.codehaus.janino.UnitCompiler$4.visitExpressionStatement(UnitCompiler.java:739)
at org.codehaus.janino.Java$ExpressionStatement.accept(Java.java:1339)
at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:758)
at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:777)
at org.codehaus.janino.UnitCompiler.access$700(UnitCompiler.java:108)
at org.codehaus.janino.UnitCompiler$4.visitBlock(UnitCompiler.java:738)
at org.codehaus.janino.Java$Block.accept(Java.java:1280)
at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:758)
at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:1783)
at org.codehaus.janino.UnitCompiler.compileDeclaredMethods(UnitCompiler.java:723)
at org.codehaus.janino.UnitCompiler.compileDeclaredMethods(UnitCompiler.java:705)
at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:431)
at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:329)
at org.codehaus.janino.UnitCompiler$3.visitPackageMemberClassDeclaration(UnitCompiler.java:302)
at org.codehaus.janino.Java$PackageMemberClassDeclaration.accept(Java.java:703)
at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:308)
at org.codehaus.janino.UnitCompiler.compileUnit(UnitCompiler.java:286)
at org.codehaus.janino.Compiler.compile(Compiler.java:496)
at org.drools.commons.jci.compilers.JaninoJavaCompiler.compile(JaninoJavaCompiler.java:171)
at org.drools.commons.jci.compilers.AbstractJavaCompiler.compile(AbstractJavaCompiler.java:49)
at org.drools.rule.builder.dialect.java.JavaDialect.compileAll(JavaDialect.java:368)
at org.drools.compiler.DialectCompiletimeRegistry.compileAll(DialectCompiletimeRegistry.java:53)
at org.drools.compiler.PackageRegistry.compileAll(PackageRegistry.java:70)
at org.drools.compiler.PackageBuilder.compileAll(PackageBuilder.java:790)
at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:749)
at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:338)
at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:567)
Regards,
Shobha M | Senior Program Manager, A&AD | NTT DATA Global Delivery Services Limited| w. +91-80-26659482 (Ext 3679) | v. 8814.3679 | m. +91.9972522743 | shobha.mahadevappa(a)nttdata.com<mailto:shobha.mahadevappa@nttdata.com>
______________________________________________________________________
Disclaimer:This email and any attachments are sent in strictest confidence for the sole use of the addressee and may contain legally privileged, confidential, and proprietary data. If you are not the intended recipient, please advise the sender by replying promptly to this email and then delete and destroy this email and any attachments without any further use, copying or forwarding
13 years, 4 months
