Re: [rules-users] Declared Types and Globals in different files with incremental KnowledgeAgent

Brecht, thanks for reporting this, but I don't think these are bugs.

1) In order to set the value of a global from a rule's RHS, you have to do somehting like this drools.getKnowledgeRuntime().setGlobal( "RULES_MATCHED", newValue ); The reason is that the rule's RHS sees a reference to the original global... a local variable with the same name initialized appropriately. Something like RULES_MATCHED = 0 will only change the local reference, not modify the global. 2) The KnowledgeAgent supports declared types incrementally.. (Esteban and I spent a lot of time to make that work), but you have to set a flag in the KA's configuration: KnowledgeAgentConfiguration aconf = KnowledgeAgentFactory.newKnowledgeAgentConfiguration(); aconf.setProperty( "drools.agent.useKBaseClassLoaderForCompiling", true ); The "incremental" mode (newInstance=false) only ensures that the existing KnowlegeBase is updated, tue "useKBaseClassLoaderForCompiling" will ALSO make sure that, as the new resources are compiled by a KnowledgeBuilder, this is initialized with the KB's classloader, which has the classes for the declared types. 3) I have proposed a fix for the issue you reported the other day... actually two in one. - 3a ) Runtime exceptions will be catched, - 3b ) you **WILL NOT** be able to use primitive types with globals anymore.. (which would result in a RTE anyway) Hope this help Best Davide On 09/20/2013 02:18 AM, De Rooms Brecht wrote: > Dear Drools Users, > > I am building a network server for drools since the existing > drools-server did not meet my requirements. Since I recently found a > bug and find the people here very helpful I'll try to explain another > issue I encountered in the hope that it improves drools 5.6 and 6.0. > I noticed that declared types and globals don't seem to be found when > you access them from a rule that was written in a different file. For > the declared types I hacked around this issue by preprocessing the > files and placing every declared type at the top of each file that > needs it. For globals this is of course not possible. > > An example is shown below. File1 is loaded from the moment the agent > starts up, then file2 is loaded. > There is a difference when the knowledgeAgent detects the two files > at once or one by one. In this case the KnowledgeAgent detects one > file and then a few minutes later the other file and compiles them > completely separately. > The idea is to keep how many rules are matched of a certain type in a > global. > > * FILE1: global_rules_matches.drl > ---------------------------------------------- > package ellipsoidfacts > > // declare > global Integer RULES_MATCHED; > > // initialize global > rule "initRULESMATCHED" > salience 999 > when > > then > RULES_MATCHED = 0; > end* > > * FILE2: testrule.drl > ---------------------------------------------- > package ellipsoidfacts > > rule "Gesture_lefthook" > when > > // ... any precedent rules ... > > then > System.out.println("matched gesture: lefthook"+ RULES_MATCHED); > end* > > In this particular case, my rule is not matched. I load these rules > using a changeset xml, my knowledgeagent is set to incremental (but > either doesnt work). > The same happens when I declare types in FILE1 and use them in FILE2. > When I write the type declaration in both files it works perfectly. > Being the same package I assumed that these two scenarios should > work. Am I doing something wrong or is the agent not supposed to work > like this and should a package be in one file? > > Kind Regards, > De Rooms Brecht > > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users