August 2014 - rules-users - Jboss List Archives

Conflict resolution strategy - before vs after Phreak impl

by mikerod

In version 5.x of Drools I see that it offered configurable conflict resolver strategies. I also read a few different Drools documentation sources that discussed varieties of "complex" conflict resolution strategies. One source discussed a tiered implementation by the name of CompositeConflictResolver - which was @ http://legacy.drools.codehaus.org/Conflict+Resolution. We have been experimenting with uplifting from Drools v5.6.0.Final to a v6.x version and we noted a fairly significant performance degradation /(a)/. When digging into some rule logging, we found that the issue was that our rule load order was not behaving well in terms of conflict resolution. The "wrong" rule activations were chosen to go first on the agenda, and this was causing a lot of unnecessary/redundant "movement" within the Rete network. After reading through the documentation on conflict resolution strategies and noting that it was configurable in Drools v5.x, I started thinking more about the importance a conflict resolution strategy on performance. Digging deeper, I believe Drools v5.6.0.Final uses `org.drools.core.conflict.DepthConflictResolver` as the default resolver (which is not the CompositeConflictResolver mentioned above interestingly). In Drools v6.x (around v6.2.x I believe) with Phreak enabled, there is a `org.drools.core.conflict.PhreakConflictResolver` that is used as the default resolver. This raises a few questions: /1)/ With Phreak enabled, it looks like the conflict resolver is *not* configurable anymore. I believe this is the case due to these lines <https://github.com/droolsjbpm/drools/blob/master/drools-core/src/main/jav...> . Why was this configuration options removed? /2)/ The PhreakConflictResolver does not seem to be doing anything very sophisticated now. I gather that it respects salience first, then falls back to rule load order. I found this around these lines <https://github.com/droolsjbpm/drools/blob/master/drools-core/src/main/jav...> . Why was this implementation chosen? Is it discussed or documented anywhere? Was it determined that this performs better than anything else or that there is no significant difference either way? There are about 4 conflict resolver impls in the org.drools.core.conflict package. In Drools v5.6.x I saw there were 10-11 of them in the similarly purposed org.drools.conflict package. /3)/ (related to /(2)/) Why was the default conflict resolution strategy changed to PhreakConflictResolver from the DepthConflictResolver used in v5.6.x? I do not think they are the same based on the source code, however, I cannot say I fully understand all of the semantics of the `Activation#getActivationNumber` used in the DepthConflictResolver. I know that my perf issue /(a)/ noted above could be solved by using salience, etc. I was wanting to avoid using salience where possible as it leads to more fragile, less declarative systems. We were able to fix the perf issue, by simply changing the rule load order anyways. My question is not specifically asking how to deal with this perf issue. Instead I'm asking about Drools choice of conflict resolution strategy in v6, as I have listed in points /1-3/ above. In the blog post @ http://blog.athico.com/2013/11/rip-rete-time-to-get-phreaky.html, I think the sentence, /"A simple heuristic, based on the rule most likely to result in firings, is used to select the next rule for evaluation; this delays the evaluation and firing of the other rules."/ is the only thing I see on the topic of conflict resolution (at least I think it is). I understand the parts about unlinked and linked rules, however, when the agenda is populated by multiple activations of the same salience, that's when things get interesting from the point of view of the topic discussed here. I appreciate any feedback with regards to this. -- View this message in context: http://drools.46999.n3.nabble.com/Conflict-resolution-strategy-before-vs-... Sent from the Drools: User forum mailing list archive at Nabble.com.

11 years, 7 months

3
4
0 / 0

Slf4j Log4j logger not working with Drools drl while using as a global variable.

by Soumya.plavaga

I am using global slf4j log4j logger as a global variable within our drl and inserting that global logger value at runtime into kiesession. While we are trying to do logger.info with multiple arguments then it's giving the following exception stack trace - Exception executing consequence for rule "Test Logger 2" in test.rules.system: java.lang.RuntimeException: cannot invoke method: info at org.drools.core.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39) at org.drools.core.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1027) at org.drools.core.phreak.RuleExecutor.fire(RuleExecutor.java:129) at org.drools.core.phreak.RuleExecutor.evaluateNetworkAndFire(RuleExecutor.java:71) at org.drools.core.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:935) at org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1200) at org.drools.core.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:952) at org.drools.core.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:926) at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:232) at test.platform.rules.executor.service.impl.RuleExecutorServiceImplTest.testExecuteRule(RuleExecutorServiceImplTest.java:230) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74) at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83) at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:232) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:89) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229) at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71) at org.junit.runners.ParentRunner.run(ParentRunner.java:309) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:175) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) Caused by: java.lang.RuntimeException: cannot invoke method: info at org.mvel2.optimizers.impl.refl.nodes.MethodAccessor.getValue(MethodAccessor.java:63) at org.mvel2.optimizers.impl.refl.nodes.VariableAccessor.getValue(VariableAccessor.java:37) at org.mvel2.ast.ASTNode.getReducedValueAccelerated(ASTNode.java:108) at org.mvel2.MVELRuntime.execute(MVELRuntime.java:86) at org.mvel2.compiler.CompiledExpression.getDirectValue(CompiledExpression.java:123) at org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:119) at org.mvel2.MVEL.executeExpression(MVEL.java:930) at org.drools.core.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:107) at org.drools.core.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1016) ... 36 more Caused by: java.lang.ArrayIndexOutOfBoundsException: 1 at org.mvel2.optimizers.impl.refl.nodes.MethodAccessor.executeAll(MethodAccessor.java:140) at org.mvel2.optimizers.impl.refl.nodes.MethodAccessor.getValue(MethodAccessor.java:48) ... 44 more Example: My drl file looks like this - package test.system.rule; import test.platform.model.*; import org.slf4j.Logger; global Logger logger; rule "Test Logger 1" when then logger.info("within test logger 1"); end rule "Test Logger 2" when then logger.info("within test logger 2. Rule fired {}", drools.getRule().getName()); end While rules are firing then the first logger is getting printed into console but second one is not getting printed and giving the above exception to me. -- View this message in context: http://drools.46999.n3.nabble.com/Slf4j-Log4j-logger-not-working-with-Dro... Sent from the Drools: User forum mailing list archive at Nabble.com.

11 years, 7 months

4
5
0 / 0

Error while login in Guvnor 5.3.3.Final, Any thoughts/Suggestion on this?

by LaKhI ReDdY!!!!!!!!!!!

Hi All, I have migrated from Guvnor 5.1.1 to Guvnor 5.3.3.Final. I am logging using SSO. I am getting the bellow error message on the UI when i try to login. java.lang.NullPointerException at org.drools.guvnor.server.util.LoggingHelper.error(LoggingHelper.java:76) at org.drools.guvnor.server.SecurityServiceServlet.doUnexpectedFailure(SecurityServiceServlet.java:55) at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:67) at javax.servlet.http.HttpServlet.service(HttpServlet.java:727) at javax.servlet.http.HttpServlet.service(HttpServlet.java:820) at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227) at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300) at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56) at org.jboss.seam.web.ContextFilter$1.process(ContextFilter.java:42) at org.jboss.seam.servlet.ContextualHttpServletRequest.run(ContextualHttpServletRequest.java:65) at org.jboss.seam.web.ContextFilter.doFilter(ContextFilter.java:37) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56) at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3715) at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3681) at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321) at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120) at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2277) at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2183) at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1454) at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209) at weblogic.work.ExecuteThread.run(ExecuteThread.java:178) In Application Server, i can see the below error. ERROR 05-08 07:07:30,903 (LoggingHelper.java:error:74) Type '[Lorg.drools.guvnor.client.configurations.Capability;' was not assignable to 'com.google.gwt.user.client.rpc.IsSerializable' and did not have a custom field serializer.For security purposes, this type will not be serialized.: instance = [Lorg.drools.guvnor.client.configurations.Capability;@256c0579 <Aug 5, 2014 7:07:30 AM PDT> <Error> <HTTP> <BEA-101017> <[ServletContext@626550860[app:drools-guvnor module:drools-guvnor.war path:/drools-guvnor spec-version:2.5], request: weblogic.servlet.internal.ServletRequestImpl@20c579cd[ Any thought/suggestion on this? Regards, Lakshmi Reddy

11 years, 7 months

1
0
0 / 0

Drools Fusion (CEP) & clustering

by Ephemeris Lappis

Hello. I'm looking for some reference architecture for Drools CEP clustering. If I'm not wrong, the Drools 6.x documentation doesn't explain how to set a clustered environment to handle events processing. For example, how can we ensure load distribution, time windows control, state integrity, etc., running several engines ? Any information about that ? Thanks in advance. Regards. -- View this message in context: http://drools.46999.n3.nabble.com/Drools-Fusion-CEP-clustering-tp4030560.... Sent from the Drools: User forum mailing list archive at Nabble.com.

11 years, 7 months

2
2
0 / 0

Need help in drools-guvnor5.3.3.Final SSO(Single Sign on) authentication enabling

by LaKhI ReDdY!!!!!!!!!!!

Hi, What are the files need be changed to have SSO(single sign on) br drools-guvnor 5.3.3.Final version? I have un commented the below line in components.xml, still its not working? <security:identity authenticate-method="#{ssoAuthenticator.authenticate}"/> Is there any other changes required? Regards, Lakshmi

11 years, 7 months

1
0
0 / 0

Build&Deploy - Drools Document

by Ricardo

15.7.4.1. Build & Deploy Build & Depoy builds the current project and deploys the KJAR into the workbench internal Maven repository. the above statement from the drools document says deploys into internal document but you can deploy to remote maven repo modifying pom.xml. The above statement restriction the extended functionality of Build and Deploy. ----- with kind regards, -- View this message in context: http://drools.46999.n3.nabble.com/Build-Deploy-Drools-Document-tp4030554.... Sent from the Drools: User forum mailing list archive at Nabble.com.

11 years, 7 months

3
2
0 / 0

Api changes from drools 5.0.1 to 6.0.1??

by techy_bolek

We are upgrading our application from drools 5.0.1 to drools 6.0.1 Final. I noticed there are significant API changes. Many classes that used to be in org.drools appear to be now in org.drools.core. Also, some classes appear to be gone: DebugRuleFlowEventListener, RuleAgent. My question is: is there a documentation somewhere explaining the API differences between the two versions? If there is no such documentation - can anyone advise what to do about DebugRuleFlowEventListener and RuleAgent? Thanks, Thomas -- View this message in context: http://drools.46999.n3.nabble.com/Api-changes-from-drools-5-0-1-to-6-0-1-... Sent from the Drools: User forum mailing list archive at Nabble.com.

11 years, 7 months

1
0
0 / 0

FW: Need to create condition based on current date and time, start date and time, and duration

by Arocho, Vance A (CTR)

To be a little clearer, the current date and time needs to be within the time interval specified by the start date and time and the 'start date and time + duration', something like start-datetime <= current-datetime <= start-datetime + duration But I'm not sure how to express the above properly. Can this be done with just one condition, or will I need two conditions? From: Arocho, Vance A (CTR) Sent: Tuesday, July 29, 2014 12:31 PM To: 'rules-users(a)lists.jboss.org' Subject: Need to create condition based on current date and time, start date and time, and duration I'm using Drools 5.4, and am developing an Excel spreadsheet containing a decision table that requires another condition based on * The current date and time specified as an attribute on a Java object * The start date and duration of an event that are both specified within the spreadsheet (duration should be specified in hours) Is there a way to do this?

11 years, 7 months

3
4
0 / 0

2026

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

rules-users August 2014