Accumulate function, events and stream processing
by Juanker Atina
I need your help to put to work an accumulate function.
So, i will introduce several facts into working memory (StateEvent, which i
declare as event) and i want to accumulate the last five values.
I have changed a property in drools.default.rulebase.conf
(drools.eventProcessingMode = STREAM) to make the engine works in stream
mode.
And my rule is:
declare StateEvent
@role( event )
end
rule "Testing"
when
$total : Number() from accumulate(
StateEvent(itemName=="Temperatura", $val : newState) over
window:length( 5 ),
sum ( ((DecimalType)$val).toBigDecimal().doubleValue() ) )
then
#actions
end
But it's not working, as the value of $total is 0.0, no matter what i do,
and the rule is firing with every fact in the working memory.
Any help will be appreciated.
Thanks
14 years, 5 months
ruleflow and bpmn files issues with drools and guvnor 5.2 final
by style.x7
Hi all,
I've tried drools 5.2 final version with much excitement but the default
create new drools project is already giving problems:
Issue 1. Exceptions when running default created .rf and .bpmn files.
When I ran ProcessTest.java with .rf file, I get:
java.lang.NullPointerException
at
org.drools.compiler.PackageBuilder.addProcessFromXml(PackageBuilder.java:516)
at
org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:556)
at
org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:28)
at com.sample.ProcessTest.readKnowledgeBase(ProcessTest.java:36)
at com.sample.ProcessTest.main(ProcessTest.java:23)
When I ran ProcessTest.java with .bpmn file, I get:
lang.IllegalArgumentException: Unable to instantiate service for Class
'org.drools.compiler.BPMN2ProcessProvider'
at org.drools.util.ServiceRegistryImpl.get(ServiceRegistryImpl.java:161)
at
org.drools.compiler.BPMN2ProcessFactory.loadProvider(BPMN2ProcessFactory.java:29)
at
org.drools.compiler.BPMN2ProcessFactory.getBPMN2ProcessProvider(BPMN2ProcessFactory.java:21)
at
org.drools.compiler.BPMN2ProcessFactory.configurePackageBuilder(BPMN2ProcessFactory.java:12)
at
org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:559)
at
org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:28)
at com.sample.ProcessTest.readKnowledgeBase(ProcessTest.java:33)
at com.sample.ProcessTest.main(ProcessTest.java:20)
Caused by: java.lang.IllegalArgumentException: Unable to instantiate
'org.jbpm.bpmn2.BPMN2ProcessProviderImpl'
at
org.drools.util.ServiceRegistryImpl$ReflectionInstantiator.newInstance(ServiceRegistryImpl.java:210)
at
org.drools.util.ServiceRegistryImpl$ReflectionInstantiator.call(ServiceRegistryImpl.java:202)
at org.drools.util.ServiceRegistryImpl.get(ServiceRegistryImpl.java:159)
... 7 more
Caused by: java.lang.ClassNotFoundException:
org.jbpm.bpmn2.BPMN2ProcessProviderImpl
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at
org.drools.util.ServiceRegistryImpl$ReflectionInstantiator.newInstance(ServiceRegistryImpl.java:207)
... 9 more
Issue 2: Guvnor 5.2 final unable to display .rf and .bpmn files
No error message was given when guvnor is unable to display .rf files. The
popup shows blank diagrams.
For .bpmn files, guvnor with designer-1.0.0.052-jboss.war shows the oryx
editor with blank diagrams, error message:
SEVERE [JbpmProfileImpl] Could not find BPMNDI information
java.lang.IllegalArgumentException: Could not find BPMNDI information
at
com.intalio.bpmn2.impl.Bpmn2JsonMarshaller.marshallProcess(Bpmn2JsonMarshaller.java:347)
at
com.intalio.bpmn2.impl.Bpmn2JsonMarshaller.marshallDefinitions(Bpmn2JsonMarshaller.java:255)
at
com.intalio.bpmn2.impl.Bpmn2JsonMarshaller.marshall(Bpmn2JsonMarshaller.java:138)
at
com.intalio.web.profile.impl.JbpmProfileImpl$2.parseModel(JbpmProfileImpl.java:197)
at
com.intalio.web.repository.impl.UUIDBasedJbpmRepository.load(UUIDBasedJbpmRepository.java:38)
at
com.intalio.web.server.UUIDBasedRepositoryServlet.doGet(UUIDBasedRepositoryServlet.java:123)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at
com.intalio.web.filter.impl.PluggableFilter.doFilter(PluggableFilter.java:75)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190)
at
org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92)
at
org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126)
at
org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at
org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:598)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Unknown Source)
My development environment is eclipse 3.6, drools plugin 5.2 final, java 6,
windows 7, jboss as 5.1 jdk 6.
Any help would be greatly appreciated.
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14 years, 5 months
Difference between Rule Base and Knowledge Base
by Swapnil Sawant
Hi,
I had a very basic doubt. 'Rule Base' and 'Knowledge Base' are two different concepts (may be from implementation point of view )?
I got this doubt when I was going through section '1.4.7.2. Drools execution server' of drools guvnor (v5.0) where it was written like :
The drools execution server (drools-server) module is a war which you can deploy to execute "knowledgebases (rulebases)" remotely for any sort of client application
The thing is that , I have created Knowledge base from changeset.xml as follows :
kagent = KnowledgeAgentFactory.newKnowledgeAgent( "MyRuleAgent" );
kagent.applyChangeSet( ResourceFactory.newUrlResource( changesetUrl ) );
kbase = kagent.getKnowledgeBase();
Now if I wish to get Rule Base corresponding to my changeset(or rather my DRL file) using 'this kbase object' , how can I do that ?
Thanks,
Swapnil Sawant
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14 years, 5 months
Activation Firing slow on many events with timer attribute in rule (Drools Fusion)
by Philipp Herzig
Dear Community,
Drools is pretty fast regarding all my use cases. However, today I have
found a problem where I cannot find any solution. Hopefully someone of you
can help.
1. I have a rule with a @timer(10s) attribute (should be 24h later on but
doesn't matter). This rule is activated when a "create" event occurs and
invalidated once a "delete" event occurs within the timeframe of @timer.
2. I have approx. 9000 "create" events which are bulk loaded into the
working memory and creating activations for the rule above.
3. I have approx. 2000 "delete" events which are bulk loaded into my
entry-point cancelling the respective activations from step (2)
4. After the timer expired, the first activation is fired correctly.
However, all other activations are fired with some noticeable delay
(actually it needs 20-30minutes until all activations are fired).
Do you have an idea what the problem with the timer might be?
Unfortunately, I have neither an idea how the scheduler in the background
works nor which class I should start looking at.
BTW: For testing purpose I switched step (2) & (3), that is, "delete"
events are inserted before the "create" events and removed the timer
attribute which is obviously the same logic. It performs lightning fast in
this case... (all remaining activations are fired within 5
seconds). However, insertinging my "delete" events before the "create"
events is ok for testing but not feasible in practice.
It would be great if some of you has an idea or point to start within the
code.
Thanks in advance,
Philipp
14 years, 5 months
Adventures example
by tomschut
Hi,
I've been trying to get the drools examples from the 5.3 final zip to work,
but I seem to be stuck on the adventures example, the one I'm trying to
understand because of the use of the query syntax.
All other examples work, but as for Adventures eclipse reports errors on
importing declarations and analyzing expressions in e.g. Commands.drl.
When I run the examples from command line or even eclipse it does compile
and run the adventures example, so the problem seems to be related to the
plugin.
Thanks,
Tom Schut
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14 years, 5 months
Drools 5.3 DSL Or conditions
by gboro54
I am just curious if there is a way to use the "-" appending format for
appending OR conditions to an object. For example:
There exist object a
-where property1 is "Value1"
-or where property2 is "Value2"
This would equate to the drl:
Object(property1=="Value1" || property2=="Value2")
Is this possible or a trick to get something similar? Worst case I can just
separate to two individual rules.
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14 years, 5 months
