Drools performance
by Hassan
Hi everyone,
In one of my tests, I inserted 1000000 objects into the working memory,
drools engine made a lot of time to execute the program and it throws
Exception : "java.lang.OutOfMemoryError !!
Please if someone could help me to improve drools performance and specially
reduce the drools execution time
thanks
-----
Youssef AZBAKH.
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14 years, 3 months
ontologies
by Olfa h
hello,
how I can create ontologies with Drools ?
thx
14 years, 3 months
Rule Compilation error when using custom classloader
by M. Kramer
Hello everybody,
I would appreciate some help with the compilation of a rule that involves
dynamically generated POJOs (minimal example at the end of the mail).
When I add the packages of the generated POJOs manually to the imported
packages of my Eclipse plug-in that executes the knowledge session
everything works fine.
When I use my custom classloader (that successfully loads all involved
classes, I checked this thoroughly) I get the following errors:
Unable to generate rule invoker. lts cannot be resolved to a type
Rule Compilation error lts cannot be resolved to a type
Do I need to change my rules just because the involved classes are now
loaded using my custom classloader?
Thanks for your help!
M. Kramer
This is the rule that only works if the package "lts" is listed under
"Import-Package" in the MANIFEST.MF:
import java.lang.String;
import java.util.ArrayList;
import java.util.HashMap;
import org.eclipse.emf.ecore.EObject;
global java.lang.String output;
global java.util.List list;
global java.util.List pclist;
rule "Aspect"
when
$s0Decl: lts.State(name == "a")
$s0: lts.State(this == $s0Decl)
then
java.util.List param = new ArrayList<HashMap<String,EObject>>();
java.util.List ids = new ArrayList<String>();
param.add($s0);
ids.add("0");
list.add(param);
pclist.add(ids);
end
This is the code that I am using to execute the rule:
void executeKnowledgeSession(String droolsRules, URLClassLoader
urlClassLoader, Iterable<EObject> iterable) {
KnowledgeBuilderConfiguration kBuilderConfiguration =
KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration(null,
urlClassLoader);
KnowledgeBuilder knowledgeBuilder =
KnowledgeBuilderFactory.newKnowledgeBuilder(kBuilderConfiguration);
Resource droolsRulesResource =
ResourceFactory.newByteArrayResource(droolsRules.getBytes());
knowledgeBuilder.add(droolsRulesResource, ResourceType.DRL);
if (knowledgeBuilder.hasErrors()) {
...
}
KnowledgeBaseConfiguration kBaseConfiguration =
KnowledgeBaseFactory.newKnowledgeBaseConfiguration(null, urlClassLoader);
KnowledgeBase knowledgeBase =
KnowledgeBaseFactory.newKnowledgeBase(kBaseConfiguration);
knowledgeBase.getKnowledgePackages().clear();
knowledgeBase.addKnowledgePackages(knowledgeBuilder.getKnowledgePackages());
StatelessKnowledgeSession knowledgeSession =
knowledgeBase.newStatelessKnowledgeSession();
knowledgeSession.setGlobal(...);
// execute the knowledge session
knowledgeSession.execute(iterable);
}
These are the exact errors that I get:
Unable to generate rule invoker. lts cannot be resolved to a type
lts cannot be resolved to a type
Rule Compilation error lts cannot be resolved to a type
Unable to generate rule invoker. : [Rule name='Aspect']
defaultpkg/Rule_Aspect_0DefaultConsequenceInvoker.java (22:883) : lts
cannot be resolved to a type
defaultpkg/Rule_Aspect_0DefaultConsequenceInvoker.java (22:901) : lts
cannot be resolved to a type
Rule Compilation error : [Rule name='Aspect']
defaultpkg/Rule_Aspect_0.java (6:322) : lts cannot be resolved to a type
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14 years, 3 months
drl execution problem
by arup
i have one drl like below:
rule "FirstNameDifference"
no-loop true
lock-on-active true
when
person1: Person( $firstName1: firstName )
person2: Person( firstName != $firstName1 )
then
dataDifferenceVO.getDataDiffArray().add("Person/FirstName");
end
i'm passing a list of objects in which i have 2 person type objects. my aim
is to check if the firstnames are same or different. if its different i need
to add one String to the DataDiffArray that is declared inside
DataDifferenceVO class.
but as i pass 2 person objects in the WM the rule is getting executed twice.
i.e, the string "Person/FirstName" is getting added twice in the array list.
why is this happening?... the rule should compare 2 firstnames and return
one String...is not that?... what step should i take to achive what i
want....
Thanks a lot i advance... :) :) :)
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14 years, 3 months
Interface and @key in declare
by Findulas
Hello,
I want to declare a new fact base on an interface, f.e.: (i leave away all
those publics)
interface BoInterface {
int getId();
void setId(int id);
}
when i declare the fact
declare BoFact (
bo : BoInterface @key
)
the system throws an exception the a class is expected but an interface is
found, when trying to
perform the equals method.
Is there a restriction that @key cannot be used in a declare?
Greetings,
Bernd
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14 years, 3 months
ClassCastException when comparing date type with literal
by Zeke
Hi, guys:
I meet a strange issue and need your help again... I am using Drools
4.0.7.
When my rule condition is as *Message( date > "Mar-01-2012" )*,
everything is OK. But if I change it to be as below:
*$msg : Message()
Order ( $msg.date > "Mar-01-2012" )*
I will meet "java.lang.String cannot be cast to java.util.Date"
ClassCastException. "Order" is another fact. I attach the exception call
stack. Please check it. It looks like a bug to me. Do we fix it in later
release? If so, can you tell me which release contains the fix? Thanks!
14 years, 3 months
Add to rules-users
by Matt Traynham
mtraynham(a)digitalsmiths.com
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14 years, 3 months
Timer (int & cron) ignore when statement
by kkelleyjr
I have a very simple case that does not seem to work. The timer works
correctly as an int or cron but it seems to ignore the when part. here is
the rule...
rule "Database Processing Cron"
timer ( cron: 0/15 * * ? * * * )
when $c : CronJennie()
eval( $c.hasInitialRunOccured() == false )
then
logger.info( "Database processing initial run..." +
$c.hasInitialRunOccured());
$c.setInitialRunOccured();
update($c)
end
-----------------------------------------------------------------------------------------------
i have also done the when as:
$c : CronJennie(hasInitialRunOccured() == false )
I am using the lates version 5.4.0 beta2, any ideas?
Thanks for any insight
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14 years, 3 months
