Re: [rules-users] KnowledgeAgent and Guvnor restart
Thank you, Esteban, this is working for me. Also, with Drools 5.1.1 the KnowledgeAgent is resubscribing to Guvnor after shutdown/restart even without the disk cache. Best Regards, Gerret -- View this message in context: http://drools.46999.n3.nabble.com/KnowledgeAgent-and-Guvnor-restart-tp139364p2816256.html Sent from the Drools: User forum mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Can I create sub packages in Guvnor
Hello, if you have a package com.foo in Guvnor it is possible to create a new package com.foo.bar. Guvnor will then place the bar package beneath the foo package in the KBaseTree. But other than that the sub package doesn't have any relation to its parent, which I find unfortunate, too. I was hoping to be able to inherit e.g. the parent's model or functions in the sub package. My scenario is that we have a couple of KnowledgeBases that share a common set of rules, each having further specific ones which I put into sub packages. Now, whenever there is a change in a library that my common rules depend on, I've got to update all of the packages' models which may amount to quite some click-work in Guvnor. Does anybody have a suggestion for an easier way to achieve this? Regards, Gerret -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Can-I-create-sub-packages-in-Guvnor-tp2092247p2094324.html Sent from the Drools - User mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Can I create sub packages in Guvnor
Hmm... I'm currently working with 5.0 which doesn't have built-in selectors. As you have said, I would consider this a workaround. I'm not so much in favour of relying on a manual build and configuration process with setting the right categories, choosing the respective selector and creating a snapshot that uniquely identifies what has been built. When all I wanna do is simply build the package... Perhaps I'm thinking too much in terms of Java/Eclipse development here. I used to build the Packages with Ant from Eclipse which worked fine until I switched to using the KnowledgeAgent and found out that it can't compile them. We are now using the Guvnor basically as a Package builder, not really as a BRMS. Maybe not too surprising if there is some mismatch between developer-centric-drl-coding and business rule authoring :-) Cheers, Gerret -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Can-I-create-sub-packages-in-Guvnor-tp2092247p2097004.html Sent from the Drools - User mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] Reference a declared FactType from another rule file?
Hi all, does anybody know whether it's possible to reference a FactType declared in one rule file from another one? I'm developing rules with Eclipse (using Drools 5.0.1) and the rules are spread over a couple of .drl files. It would be nice to be able to declare a FactType in one file, have a rule insert instances of it into working memory and have another rule in another file (but the same package) use it in its LHS. I've tried various import statements but the compiler doesn't seem to be able to resolve the reference. Thanks, Gerret ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Reference a declared FactType from another rule file?
Thank you, Wolfgang. Indeed, it works if I compile programmatically via Ant and make sure I'm getting the order correct. Unfortunately, still, the Eclipse compiler complains. I've tried splitting rules into two source folders and placing the one with the FactType on top of the build path, but no success. Perhaps I should try with Drools 5.1. Regards, Gerret -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Reference-a-declared-FactType-from-another-rule-file-tp1994986p1997547.html Sent from the Drools - User mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Persistence issue using Oracle
Hi Ram, I've been using hibernate 3.3 with an Oracle11g which auto-created the dirty column as a NUMBER(1,0) type. Giving it a quick try, when I map as you've sketched above and add property name=dirty access=field type=boolean column=dirty length=1/ to the sessionInfo mapping the dirty column is created as NUMBER(1,0). Using type=true_false instead of boolean it becomes CHAR(1 BYTE). Perhaps one of these works for you? Regards, Gerret ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Persistence issue using Oracle
Forgot to mention that you might need to adjust the Hibernate dialect: property name=hibernate.dialect value=org.hibernate.dialect.OracleDialect/ Greetings, Gerret ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Persistence issue using Oracle
wytten dale.wyttenbach at gmail.com writes: The tables will be created depending on how you have persistence.xml configured (I used hibernate.hbm2ddl.auto value 'create') However, I did experience a problem with the eventTypes member of ProcessInstanceInfo: 'create table ProcessInstanceInfo_eventTypes' yields the error 'ORA-00972: identifier is too long'. The team is aware of this but I haven't seen a fix yet. Hope this helps. Regarding the ProcessInstanceInfo table you can add a hibernate mapping like mapping resource=hbm.xml/ in persistence.xml and then in hbm.xml something similar to hibernate-mapping package=com.foo.bar class name=org.drools.persistence.processinstance.ProcessInstanceEventInfo table=PI_EVT_INFO id name=processInstanceId access=field type=long column=pi_id/ /class /hibernate-mapping It's a while ago that I've been experimenting with the flow persistence but this was the last step required to finally make it work, as far as I remember. Regards, Gerret ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Unable to see Rules Debugging info in Drools IDE
H.C. canterburry at gmail.com writes: Hey, I am having the same problem. I have tried dubugging both as a Drools Application and a Drools Unit Test and in either case, I get no agenda, working memory or globals in the views even when I select an data item from Variables view in the Debug perspective. I saw some posts recommending switching back and forth between views and that does not seem to help. Platform and JBoss Tools drools version Eclipse 3.4.2 (stable and development - 5.1.0.v201002254M-H277-31764) Eclipse 3.5 (stable, development and latest from nightly build v20100022613N-H20-31746) No difference. Would very much appreciate some help. Are you using a StatelessKnowledgeSession? Debugging views only work for StatefulKnowledgeSessions (unfortunately). Regards, Gerret ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] Drools Ant task packages not read by KnowledgeAgent
Hi all, for deploying our rules we usually create packages in Guvnor and then deploy the .pkg binaries to our application where we access them via a change set file, e.g. as a classpath or url resource. We have also used the Drools Ant task to create packages directly from the rule sources in Eclipse, cause it would be convenient for testing and development purposes to be able to just drop that file in place of the one created from Guvnor. However it seems that the KnowledgeAgent can't read the pkg format produced from the Ant task, we get an Exception as follows: java.lang.RuntimeException: KnowledgeAgent exception while trying to deserialize KnowledgeDefinitionsPackage at org.drools.agent.impl.KnowledgeAgentImpl.rebuildResources (KnowledgeAgentImpl.java:418) at org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet (KnowledgeAgentImpl.java:120) ... Caused by: java.lang.ClassCastException: org.drools.reteoo.ReteooRuleBase at org.drools.agent.impl.KnowledgeAgentImpl.rebuildResources (KnowledgeAgentImpl.java:413) We are using the same drools-core.jar for building and running so I don't think this is a simple class version mismatch. Has anybody got a similar scenario working? Any clue what we might be doing wrong? (We are using Drools 5.0.1.) Thanks, Gerret ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Flow and Rules Together - Best practice question
Hi Mike, I have been working with Drools for only a few months now and am still rather new to it, but we've have made the same experience, switching from rules only to rules with flow, and I'm certain it's the right way to go. The performance implications you mention depend mainly on the way the rules are set up, I guess. That is, if you have expensive RHS expressions like eval() you might indeed profit from keeping your glucose-level condition at the beginning of the rules which would prevent those expressions from being reevaluted, as far as I understand. If you don't I can hardly imagine that activating the rules makes up a noticeable fraction of the overall time of your process. We here have a scenario where some rules may be activated only if the user starting the session has got corresponding privileges. Since determining the priviliges is not always trivial we definitely wanted to have that logic in one place. The first thing to do was to use inference (http://docs.codehaus.org/display/LOGICABYSS/Policy+Encapsulation) but still already with a few dozen rules and including other constraints the rule RHsides became rather cluttered. Moreover it was getting increasingly complex to control the order in which the rules fired, maintanance being another issue. Using a rule flow we have achieved really good separation of concerns: A rule's RHS mostly contains exactly those conditions that apply to its intent, none of the cross-concerns or technicalities. (Hey, what about an AspectDrools implementation? ;-) ) I am confident that OO lessons apply here, too: If you have a clean design and performance problems start to show up you are much more likely to solve them than if you have a tangled web of dependencies. Greetings, Gerret ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] KnowledgeAgent and Guvnor restart
Hello, I have got an issue with the KnowledgeAgent that seems not to survive a Guvnor restart. The scenario is as follows: * We use Drools 5.0 * On our application server we create a KnowledgeAgent applying a ChangeSet that points to a package binary on a separate Guvnor server like so: SystemEventListenerFactory.setSystemEventListener(new SystemEventLogger()); ResourceFactory.getResourceChangeNotifierService().start(); ResourceFactory.getResourceChangeScannerService().start(); KnowledgeAgent agent = KnowledgeAgentFactory.newKnowledgeAgent(workflowName); agent.applyChangeSet(changeSet); * Creating the kbase, registering globals and running sessions works fine. * We shut down Guvnor (or the connection goes down, this was how we spotted the problem) and restart it after a minute * We then try to run sessions from the same agent as above via kagent.getKnowledgeBase().newStatefulKnowledgeSession(); which returns a ksession, but then setting a global we get java.lang.RuntimeException: Unexpected global [log] at org.drools.common.AbstractWorkingMemory.setGlobal(AbstractWorkingMemory.java:5 50) at org.drools.impl.StatefulKnowledgeSessionImpl.setGlobal(StatefulKnowledgeSessio nImpl.java:284) From the debugger I can see that indeed the ruleBase's globals map is empty. The SystemEventLogger indicates that the KnowledgeAgent unsubscribes from its resource when Guvnor is down and rebuilds its kbase. Also, it stops scanning the resource and does not find it once Guvnor is up again. (See log snippet below). Wouldn't it be better in these cases to keep the resource as is in memory and try to rescan? I figure that as long as the resource is specified in the changeSet it should be considered part of the kbase and not be removed if it cannot be found. For the time being, does anyone have a suggestion how to avoid these problems? We could catch the RuntimeException and recreate the KnowledgeAgent, but perhaps there is a better way? Thanks, Gerret -- SystemEventLog -- # Guvnor is up here 07:58:01,881 ResourceChangeScanner attempt to scan 1 resources 07:58:02,209 ResourceChangeScanner thread is waiting for 60 07:58:15,067 ResourceChangeScanner attempt to scan 1 resources # Guvnor goes down here 07:58:16,738 ResourceChangeScanner removed resource=[UrlResource path='http://localhost:7080/drools- guvnor/org.drools.guvnor.Guvnor/package/com.foo.bar/LATEST'] 07:58:16,738 ResourceChangeNotification received ChangeSet notification 07:58:16,738 ResourceChangeScanner thread is waiting for 60 07:58:16,738 ResourceChangeNotification processing ChangeSet 07:58:16,738 ResourceChangeNotification ChangeSet removed resource=[UrlResource path='http://localhost:7080/drools- guvnor/org.drools.guvnor.Guvnor/package/com.foo.bar/LATEST'] for listener=org.drools.agent.impl.knowledgeagenti...@1053d6d 07:58:16,738 ResourceChangeNotification ChangeSet removed resource=[UrlResource path='http://localhost:7080/drools- guvnor/org.drools.guvnor.Guvnor/package/com.foo.bar/LATEST'] for listener=org.drools.agent.impl.knowledgeagenti...@b71c17 07:58:16,738 KnowledgeAgent received ChangeSet changed notification 07:58:16,738 KnowledgeAgent received ChangeSet changed notification 07:58:16,738 KnowledgAgent applying ChangeSet 07:58:16,738 ResourceChangeNotification thread is waiting for queue update 07:58:16,738 KnowledgAgent applying ChangeSet 07:58:16,738 KnowledgeAgent unsubscribing from resource=[UrlResource path='http://localhost:7080/drools- guvnor/org.drools.guvnor.Guvnor/package/com.foo.bar/LATEST'] 07:58:16,738 ResourceChangeNotification unsubscribing listener=org.drools.agent.impl.knowledgeagenti...@1053d6d to resource=[UrlResource path='http://localhost:7080/drools- guvnor/org.drools.guvnor.Guvnor/package/com.foo.bar/LATEST'] 07:58:16,738 KnowledgeAgent rebuilding KnowledgeBase using ChangeSet 07:58:16,738 KnowledgeAgent unsubscribing from resource=[UrlResource path='http://localhost:7080/drools- guvnor/org.drools.guvnor.Guvnor/package/com.foo.bar/LATEST'] 07:58:16,738 ResourceChangeNotification unsubscribing listener=org.drools.agent.impl.knowledgeagenti...@b71c17 to resource=[UrlResource path='http://localhost:7080/drools- guvnor/org.drools.guvnor.Guvnor/package/com.foo.bar/LATEST'] 07:58:16,738 KnowledgeAgent rebuilding KnowledgeBase using ChangeSet 07:58:16,738 KnowledgeAgent new KnowledgeBase now built and in use 07:58:16,738 KnowledgeAgent new KnowledgeBase now built and in use 07:59:02,202 ResourceChangeScanner attempt to scan 0 resources 07:59:02,202 ResourceChangeScanner thread is waiting for 60 # Guvnor back up here 07:59:16,731 ResourceChangeScanner attempt to scan 0 resources 07:59:16,731 ResourceChangeScanner thread is waiting for 60 ___ rules-users mailing list rules-users@lists.jboss.org
[rules-users] KnowledgeAgent and Guvnor restart
Hello, I have got an issue with the KnowledgeAgent that seems not to survive a Guvnor restart. The scenario is as follows: * We use Drools 5.0 * On our application server we create a KnowledgeAgent applying a ChangeSet that points to a package binary on a separate Guvnor server like so: SystemEventListenerFactory.setSystemEventListener(new SystemEventLogger()); ResourceFactory.getResourceChangeNotifierService().start(); ResourceFactory.getResourceChangeScannerService().start(); KnowledgeAgent agent = KnowledgeAgentFactory.newKnowledgeAgent(workflowName); agent.applyChangeSet(changeSet); * Creating the kbase, registering globals and running sessions works fine. * We shut down Guvnor (or the connection goes down, this was how we spotted the problem) and restart it after a minute * We then try to run sessions from the same agent as above via kagent.getKnowledgeBase().newStatefulKnowledgeSession(); which returns a ksession, but then setting a global we get java.lang.RuntimeException: Unexpected global [log] at org.drools.common.AbstractWorkingMemory.setGlobal(AbstractWorkingMemory.java:5 50) at org.drools.impl.StatefulKnowledgeSessionImpl.setGlobal(StatefulKnowledgeSessio nImpl.java:284) From the debugger I can see that indeed the ruleBase's globals map is empty. The SystemEventLogger indicates that the KnowledgeAgent unsubscribes from its resource when Guvnor is down and rebuilds its kbase. Also, it stops scanning the resource and does not find it once Guvnor is up again. (See log snippet below). Wouldn't it be better in these cases to keep the resource as is in memory and try to rescan? I figure that as long as the resource is specified in the changeSet it should be considered part of the kbase and not be removed if it cannot be found. For the time being, does anyone have a suggestion how to avoid these problems? We could catch the RuntimeException and recreate the KnowledgeAgent, but perhaps there is a better way? Thanks, Gerret -- SystemEventLog -- # Guvnor is up here 07:58:01,881 ResourceChangeScanner attempt to scan 1 resources 07:58:02,209 ResourceChangeScanner thread is waiting for 60 07:58:15,067 ResourceChangeScanner attempt to scan 1 resources # Guvnor goes down here 07:58:16,738 ResourceChangeScanner removed resource=[UrlResource path='http://localhost:7080/drools- guvnor/org.drools.guvnor.Guvnor/package/com.foo.bar/LATEST'] 07:58:16,738 ResourceChangeNotification received ChangeSet notification 07:58:16,738 ResourceChangeScanner thread is waiting for 60 07:58:16,738 ResourceChangeNotification processing ChangeSet 07:58:16,738 ResourceChangeNotification ChangeSet removed resource=[UrlResource path='http://localhost:7080/drools- guvnor/org.drools.guvnor.Guvnor/package/com.foo.bar/LATEST'] for listener=org.drools.agent.impl.knowledgeagenti...@1053d6d 07:58:16,738 ResourceChangeNotification ChangeSet removed resource=[UrlResource path='http://localhost:7080/drools- guvnor/org.drools.guvnor.Guvnor/package/com.foo.bar/LATEST'] for listener=org.drools.agent.impl.knowledgeagenti...@b71c17 07:58:16,738 KnowledgeAgent received ChangeSet changed notification 07:58:16,738 KnowledgeAgent received ChangeSet changed notification 07:58:16,738 KnowledgAgent applying ChangeSet 07:58:16,738 ResourceChangeNotification thread is waiting for queue update 07:58:16,738 KnowledgAgent applying ChangeSet 07:58:16,738 KnowledgeAgent unsubscribing from resource=[UrlResource path='http://localhost:7080/drools- guvnor/org.drools.guvnor.Guvnor/package/com.foo.bar/LATEST'] 07:58:16,738 ResourceChangeNotification unsubscribing listener=org.drools.agent.impl.knowledgeagenti...@1053d6d to resource=[UrlResource path='http://localhost:7080/drools- guvnor/org.drools.guvnor.Guvnor/package/com.foo.bar/LATEST'] 07:58:16,738 KnowledgeAgent rebuilding KnowledgeBase using ChangeSet 07:58:16,738 KnowledgeAgent unsubscribing from resource=[UrlResource path='http://localhost:7080/drools- guvnor/org.drools.guvnor.Guvnor/package/com.foo.bar/LATEST'] 07:58:16,738 ResourceChangeNotification unsubscribing listener=org.drools.agent.impl.knowledgeagenti...@b71c17 to resource=[UrlResource path='http://localhost:7080/drools- guvnor/org.drools.guvnor.Guvnor/package/com.foo.bar/LATEST'] 07:58:16,738 KnowledgeAgent rebuilding KnowledgeBase using ChangeSet 07:58:16,738 KnowledgeAgent new KnowledgeBase now built and in use 07:58:16,738 KnowledgeAgent new KnowledgeBase now built and in use 07:59:02,202 ResourceChangeScanner attempt to scan 0 resources 07:59:02,202 ResourceChangeScanner thread is waiting for 60 # Guvnor back up here 07:59:16,731 ResourceChangeScanner attempt to scan 0 resources 07:59:16,731 ResourceChangeScanner thread is waiting for 60 -- Nur noch bis 31.01.2010: DSL-Komplettpaket für 16,99 Euro/mtl.!* http://portal.gmx.net/de/go/dsl02
[rules-users] Exception handling policy
Hello, I have got a question about Exception handling policy in Drools 5.0. My issue is a case where a client application triggered rule execution on the server, which was throwing a ConsequenceException. The client, not having drools libs in its classpath, then had a ClassNotFoundException. I would therefore want to catch the ConsequenceException on the server and throw an Exception with its cause. I am not sure however if ConsequenceException.getCause() would always yield a non-drools Exception or if that might be another drools type. Also, is it always a ConsequenceException that gets thrown from a session or can there be other Exception types? Thanks, Gerret ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
