Logic in the when clause
by Zevenbergen, Alex
Hi,
quick newbie question about the when clause in a rule. eg can i get the
fact to be tested from the result of two other inputted facts?
details.HOME_MATCH_SCORE - details.HOME_FULL_TIME_SCORE >
details.AWAY_MATCH_SCORE - details.AWAY_FULL_TIME_SCORE
I assumed this would work fine but it doesn't recognise the '-' as a
minus!
Thanks in advance
Alex
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15 years, 8 months
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15 years, 8 months
mapping between the eclipse drools project and Guvnor
by Wishing Carebear
Hello:
I'm a newbie to drools and have installed the eclipse plugin IDE and the
guvnor.
Wondering what is the mapping between the IDE projects and the guvnor assets
and packages view.
Thanks,
Ravi
15 years, 8 months
iterating over objects in a StatelessKnowledgeSession
by Michal Bali
Hi,
I am trying this on trunk. There is currently no way how to iterate objects
in a StatelessKnowledgeSession.
I've tried to use the GetObjectsCommand, however when it is executes the
result is lost in the ether :). The collection of objects is not handed back
to the user.
I guess it should probably be added to the BatchExecutionResults? It will
then be possible to access this collection of objects.
Please let me know if there is a different way how to iterate over objects
in a StatelessKnowledgeSession. I'd like to use an ObjectFilter as well.
Best Regards,
Michal
15 years, 8 months
signalEvent in DRL file
by raphael.bernhard＠orange-ftgroup.com
I'm playing around with the ruleflow signal facility.
Within the ruleflow, it's rather easy to "signal" an event and it works well (using an action, ...). But I wanted to write some (DRL) rules to signal events conditionally (e.g. each tine a condition happens, signal the event).
The rules that have to signal the event are activated from a ruleflow using a RuleflowGroup. I didn't find any easy way to get a reference to the process variable (ProcessInstance) within the rules activated by the RuleFlowGroup.
ps: I'm trying to mimic a simple reactive system in the domain of machine-to-machine behaviour programming.
--
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Orange LABS
905, Rue Albert Einstein
06921 SOPHIA ANTIPOLIS Cedex
Tel: (+33) 4 92 94 52 94 Fax: (+33) 4 92 38 93 20
15 years, 8 months
Re: [rules-users] Identify Rule on Attributes
by Greg Barton
Yes, if you use a rules engine that implements rete the functionality you need is available.
Read the Drools docs.
Carefully.
GreG
On Mar 12, 2009, at 23:40, Nikhil_dev <k.nikhil(a)verchaska.com> wrote:
thank u Scott and Greg for u'r reply......
by the way Greg is it possible for me to use this rete algo through rule
engine as this functionality already available in the core of Rule Enigne or
should i implement this out side rule engine.
Greg Barton wrote:
That's the core functionality of a rule engine. The rete algorithm does
this, and drools implements rete.
--- On Thu, 3/12/09, Nikhil_dev <k.nikhil(a)verchaska.com> wrote:
so now is there
any way with the help of drools we can identify which rule
to execute with
out executing all of them one after the another
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:working:Nikhil
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15 years, 8 months
RuleRepository printStackTrace Instead of Exception
by Carlsen, Len
Hi,
I am using Drools 5.0.0.SNAPSHOT on JDK 1.6 and have noticed that there
are several methods in the org.drools.repository.RulesRepository like
exportRulesRepositoryToStream and importRulesRepositoryFromStream that
do not throw any exceptions but does a printStackTrace instead. Could we
have them throw RulesRepositoryExceptions instead J.
Also, the org.drools.repository.RulesRepository.MigrateDroolsPackage
does a System.out.println (could all System.out.println be logs) saying
that auto-migration is complete even though no packages have been
migrated on a new clean repository (seems that performed = true before
any migration is performed).
If I can be of any help please let me know?
Thanks,
Len
Len Carlsen
Student Systems
The University of British Columbia
15 years, 8 months
JSR-94 Throws Exception for KnowledgePackage
by Carlsen, Len
Hi,
I am upgrading our application from Drools 4.0.7 to 5.0.0.SNAPSHOT
(using JDK 1.6)
I have noticed that RuleServiceProvider.createRuleExecutionSet requires
a org.drools.rule.Package instead of a KnowledgePackage. If I use a
KnowledgePackage the following exception is thrown:
RuleException(javax.rules.admin.RuleExecutionSetCreateException:
Incoming AST object must be an org.drools.rule.Package. Was class
org.drools.definitions.impl.KnowledgePackageImp), root cause(null)
at
org.drools.jsr94.rules.admin.LocalRuleExecutionSetProviderImpl.createRul
eExecutionSet(LocalRuleExecutionSetProviderImpl.java:211)
To get rid of the exception I have to cast
org.drools.definitions.impl.KnowledgePackageImp to KnowledgePackage.
Maybe
org.drools.jsr94.rules.admin.LocalRuleExecutionSetProviderImpl.createRul
eExecutionSet should also look for a KnowledgePackage?
Am I doing something wrong?
Below is a code snippet of what I am doing:
KnowledgePackage binPkg = (KnowledgePackage)
brmsRepository.loadRuleSet(uuid).getCompiledRuleSetObject();
// Drools JSR-94 requires a org.drools.rule.Package
org.drools.rule.Package pkg =
((org.drools.definitions.impl.KnowledgePackageImp) binPkg).pkg;
String RULE_SERVICE_PROVIDER = "http://drools.org/";
String RULE_URI = "MyPackage";
RuleServiceProviderManager.registerRuleServiceProvider(RULE_SERVICE_PROV
IDER, RuleServiceProviderImpl.class);
RuleServiceProvider ruleServiceProvider =
RuleServiceProviderManager.getRuleServiceProvider(RULE_SERVICE_PROVIDER)
;
RuleAdministrator ruleAdministrator =
ruleServiceProvider.getRuleAdministrator();
LocalRuleExecutionSetProvider ruleSetProvider =
ruleAdministrator.getLocalRuleExecutionSetProvider(null);
Here an exception is thrown for a KnowledgePackage
// Drools JSR-94 requires a org.drools.rule.Package - Exception
thrown if it is a KnowledgePackage
RuleExecutionSet ruleExecutionSet =
ruleSetProvider.createRuleExecutionSet(pkg, null);
Etc...
Thanks,
Len
Len Carlsen
Student Systems
The University of British Columbia
15 years, 8 months
Globals not working with Drools Guvnor 5.0.CR1 Web Guided Decision tables
by guyt1122＠aim.com
Hi,
I'm trying to use Globals with the Web Guided Decision tables and there seems to be a few issues.? I can define the Action column and select the global fact but the field selector contains "(please choose a fact pattern first)" and the edit button seems to be disabled.? The global fact is not visible on the Condition column pattern selector.
Please let me know if I'm not suppose to use Globals with Web Guided Decision tables or if this is a bug.
I'm using Drools 5.0.CR1 build.
Thanks,
-GuyT
15 years, 8 months
Use of bitwise operators in LHS expression
by CK
Hi,
I am running into some expression evaluation issues, mostly revolving
around MVEL scripting in the RHS and some expression evals on the left
hand side.
Specifically, here are some of my questions
1) Does Drools support bitwise operators inside the rules? I've tried
all different kinds of combinations, but it doesn't seem to like it.
This is happening on the LHS. I believe I tried it on the RHS and it
still causes compile exceptions. My understanding is that MVEL 2.0
supports Bitwise ops.
2) Object casting. Strangely, on the RHS, I have a Float that doesn't
want to cast to float. Doesn't Drools (or perhaps MVEL) do auto-
unboxing?
3) Function calling. I read somewhere that MVEL cannot call out to a
declared function in the rule. So that means, the rule will have to
be in Java mode. Also, the function can only be written in java
style, not mvel. Am I correct on this one?
Thank you,
CK
15 years, 8 months
