Drools Guvnor DB setup issue.
by amilac＠hsenidmobile.com
hi everyone,
I had problem in setting up a Database (mysql) with Drools Guvnor. wht i did was put the guvnor war file into JBOSS deploy dir and it creats a repository.xml and repoitory dir under bin folder.
and i change the repository.xml as following
<PersistenceManager class = "org.apache.jackrabbit.core.persistence.bundle.MySqlPersistenceManager">
> <param name="driver" value="com.mysql.jdbc.Driver"/>
> <param name="url" value="jdbc:mysql://localhost:3306/ brms"/>
> <param name="user" value="brms_user"/>
> <param name="password" value="brms_password"/>
> <param name="schemaObjectPrefix" value="${wsp.name}_"/>
> <param name="schema" value="mysql"/>
> </PersistenceManager>
but it gave some error and wont deploy.
please any have the answer please do reply me
it very very urgent i spent 2 days for this setup still i couldn't get a result
17 years, 2 months
Building StatefulKnowledgeSession with KnowledgeAgent on real time
by Lucas Amador
Hi,
exists a way to add an agent to know when the KnowledgeBase is
reconstructed by the associated KnowledgeAgent?. There is an
SystemEventListener interface that can be implemented and added to the
agent but is only to logging. Maybe there is another event listener
that i'm missing out? I know that actually isn't possible to add
incremental changes into the KnowledgeBase because the code is
commented.
any ideas?
thanks
17 years, 2 months
Help with LHS part of the Rule
by new2drools
I am using Drools 5.
In the LHS part of a rule, is it possible to call a method, in a class
instance (that has been inserted into the working memory) which expects two
parameters, and returns a boolean?
For example, how can I invoke the following method in LHS (in a DRL file)
part of the rule?
public class BusinessService {
public boolean isValidSomething(String param1, String param2) {
return true;
}
}
The only way I could do this was:
$bService : BusinessService()
$retValue : Boolean() from $bService.isValidSomething("param1", "param2")
The problem I am running into is, by using the above syntax, I am forced to
use 'eval', when I have to use some conditional logic. My understanding is
that using 'eval' will result in sub-optimal performance.
Another question I have is related to conditional logic in the rule
language. When I capture the return values (as shown above) in variables, I
am not able to use the following syntax...
$date1 : Date() from Object1.getBeginDate()
$date2 : Date() from Object2.getCancelDate()
(Object1 and Object2 are different object's)
(($retValue == Boolean.FALSE) && ($date1 > $date2))
I have to do the following:
eval (($retValue == Bollean.FALSE) && ($date1.getTime() > $date2.getTime()))
I am not sure if I am using the rule language correctly. So, please bear
with me, if I making some obvious mistakes.
Any help, would be highly appreciated.
Thanks!
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17 years, 2 months
Compatibility of Drools for High Traffic events
by Thilina Anjitha
Hi,
I'm planning to use drools to define rules and execute promotions for
telecommunication events such as voice call, SMS, MMS, etc.. events. So
we can expect very large amount of events per day.
We need to define different business rules to provide promotions,
bonuses to the subscribers. Some of the example promotions are listed
here.
1. During the period of X-Y, every 10th MMS sender gets $ 2.00 worth of
free SMS. And the winners will be notified via SMS.
2. During the period of X-Y, random 100 calls to Japan of the CHAT
tariff plan get free movie tickets. And the winners will be notified via
SMS. The same subscriber will not be selected as winner again and again.
3. During the period of X-Y, any subscribers have usage for voice call
or SMS get bonuses as follows :
$ 10 - 20 : get 20% as bonus of free SMS
$ 20 - 50 : get 50% as bonus of free air time
$ 50 - 70 : get 70% as bonus of free IDD
I'm in the evaluation period of the Drools for the system. If anybody
give recommendations or flexibilities/limitations of the drools for our
application.
Thanks,
Thilina
17 years, 2 months
Re: [rules-users] Drools Result
by Greg Barton
I usually use the "insert object, keep the FactHandle, then retract by FactHandle later" technique. That's just how I roll.
--- On Sat, 6/20/09, Mark Proctor <mproctor(a)codehaus.org> wrote:
> You can also insert the object and then use a query to
> retrieve it - lots of ways to slice and dice this one :)
> Wolfgang Laun wrote:
> One good way of producing results from rule is indeed to
> create and insert an object as a fact. The idiom on the RHS is
>
> inser( new DroolsResult(...) );
>
> The application could retrieve this with a query over all
> DroolsResult
17 years, 2 months
Drools Result
by skasab2s
Hello guys,
I'm writing a medical application for weaning from artificial respiration.
I'm putting some medical facts into the working memory and some rules work
on them.
The only problem is that I should return an result object (I called it
DroolsResult) and there should stay if weaning can be successful, remarks
and so on.
I heard that globals are good for returning result. Are there other
approaches? Can't one rule create the result object and put it in the
working memory so that I can fetch it from there using java code?
Thanks a lot and regards!
skasab2s
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17 years, 2 months
Creating drools rules porgramatically?
by Malay Shah
Hi,
I am looking to create the drools Rule objects programatically, and I
believe there is API to do that in 4.0.7. But, the API looks complex and the
documentation is not sufficient. Could anyone please point me to some
examples of doing this? I basically don't want to write rules in .drl files,
but have a database store the rules and make them strongly typed (by
generating Rule Objects directly from DB). Any help is much appreciated.
Thanks
Malay
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17 years, 2 months
help
by SHIMI Abdelouahad ( Prestataire )
I was deploy Guvnor(drools-5.0.0.CR1-guvnor) as an exploded archive on
the JBoss Application Server(version jboss-4.2.3.GA).
And I was
* Create categories, ok
* Create package,ok
* Importe model, ok
* Create rule, ok
And create a simple Drools application(with Eclipse version 3.4 and
pluging drools 5.0) that will use a package served by Guvnor:
public class GuvnorTest {
public static final void main(String[] args) {
RuleAgent agent =
RuleAgent.newRuleAgent("/Guvnor.properties");
RuleBase ruleBase = agent.getRuleBase();
WorkingMemory workingMemory =
ruleBase.newStatefulSession();
Driver d = new Driver("Jarek", 20, null);
workingMemory.insert(d);
workingMemory.fireAllRules();
for (Iterator i = workingMemory.iterateObjects();
i.hasNext();) {
System.out.println(i.next().getClass().getCanonicalName());
}
}
}
The properties file:
url=http://localhost:8080/drools-guvnor/org.drools.guvnor.Guvnor/package
/myNewPackage/LATEST
And When the application is run I have this Exception:
RuleAgent(default) EXCEPTION (Thu Jun 18 10:46:40 CEST 2009): null.
Stack trace should follow.
java.io.OptionalDataException
at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1310)
at
java.io.ObjectInputStream.readObject(ObjectInputStream.java:339)
at
org.drools.util.DroolsStreamUtils.streamIn(DroolsStreamUtils.java:189)
at
org.drools.util.DroolsStreamUtils.streamIn(DroolsStreamUtils.java:158)
at
org.drools.agent.HttpClientImpl.fetchPackage(HttpClientImpl.java:50)
at org.drools.agent.URLScanner.readPackage(URLScanner.java:148)
at org.drools.agent.URLScanner.getChangeSet(URLScanner.java:120)
at
org.drools.agent.URLScanner.loadPackageChanges(URLScanner.java:96)
at
org.drools.agent.RuleAgent.checkForChanges(RuleAgent.java:410)
at
org.drools.agent.RuleAgent.refreshRuleBase(RuleAgent.java:362)
at org.drools.agent.RuleAgent.configure(RuleAgent.java:347)
at org.drools.agent.RuleAgent.init(RuleAgent.java:247)
at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:187)
at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:147)
at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:256)
at kijanowski.eu.GuvnorTest.main(GuvnorTest.java:13)
Exception in thread "main" java.lang.NullPointerException
at
org.drools.agent.RuleAgent.refreshRuleBase(RuleAgent.java:363)
at org.drools.agent.RuleAgent.configure(RuleAgent.java:347)
at org.drools.agent.RuleAgent.init(RuleAgent.java:247)
at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:187)
at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:147)
at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:256)
at kijanowski.eu.GuvnorTest.main(GuvnorTest.java:13)
I am realy stuck in the middle please please please please please help.
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17 years, 2 months
