[rules-users] How to Access Rule RHS (THEN Part) from JAVA?
Hi Drools Gurus, One more newbie here for Drools Guvnor. I have chosen guvnor-distribution-5.3.0.Final (I could see version as SNAPSHOT 5.4.0 within Guvnor--Administration--About) to start with. After reading through the complete user manual, I was able to setup and deploy Drools Guvnor war in JBoss AS 7. My intension is to access all the rules that i have created using Guvnor web. I have written a java test case to access my Rules which are resided in a drools Package using REST API. I was successful to access them using standard Authentication mechanism with charset*.xml. Even though i was able to call fireAllRules with specific rule using AgendaFilter provided. But i was not able to access the values at RHS after a specific rule got fired. For Example, i want to access percent value as 2.5 after the below sample rule is successfully executed, I have uploaded my model jar to Guvnor containing Person LoanFormula classes. ---Rule 1 (please do not see the syntax errors) WHEN Person age 25 THEN LoanFormula percent = 2.5 JAVA Code follows - KnowledgeBase kbase = ... FactType personType = kbase.getFactType( org.drools.examples,Person ); Object bob = personType.newInstance(); personType.set( bob, name,Bob ); personType.set( bob,age,42 ); StatefulKnowledgeSession ksession = ... ksession.insert( bob ); AgendaFilter filter = new ..(Rule1); int count = ksession.fireAllRules(filter); String name = personType.get( bob, name ); int age = personType.get( bob, age ); It would be great help if some one can show me the sample code for accessing RHS part of the Rule. Please let me know if you need more details. thanks Kiru -- View this message in context: http://drools.46999.n3.nabble.com/How-to-Access-Rule-RHS-THEN-Part-from-JAVA-tp4018651.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] How to Access Rule RHS (THEN Part) from JAVA?
You cannot access any variable declared between 'then' and 'end'. These are local in the same sense as a variable declared in a Java method. For passing anything computed in a rule consequence to the embedding Java program you might * insert a Fact of some suitable type and retrieve this from the ksession using API methods, e.g., by running a query, or by calling CollectionObject getObjects(ObjectFilter filter) ) * define a global and simply assign to it in the consequence, and retrieve it using ksession API Object getGlobal( String identifier ) -W On 13/07/2012, Ravikiran ravikiran.kaka...@gmail.com wrote: Hi Drools Gurus, One more newbie here for Drools Guvnor. I have chosen guvnor-distribution-5.3.0.Final (I could see version as SNAPSHOT 5.4.0 within Guvnor--Administration--About) to start with. After reading through the complete user manual, I was able to setup and deploy Drools Guvnor war in JBoss AS 7. My intension is to access all the rules that i have created using Guvnor web. I have written a java test case to access my Rules which are resided in a drools Package using REST API. I was successful to access them using standard Authentication mechanism with charset*.xml. Even though i was able to call fireAllRules with specific rule using AgendaFilter provided. But i was not able to access the values at RHS after a specific rule got fired. For Example, i want to access percent value as 2.5 after the below sample rule is successfully executed, I have uploaded my model jar to Guvnor containing Person LoanFormula classes. ---Rule 1 (please do not see the syntax errors) WHEN Person age 25 THEN LoanFormula percent = 2.5 JAVA Code follows - KnowledgeBase kbase = ... FactType personType = kbase.getFactType( org.drools.examples,Person ); Object bob = personType.newInstance(); personType.set( bob, name,Bob ); personType.set( bob,age,42 ); StatefulKnowledgeSession ksession = ... ksession.insert( bob ); AgendaFilter filter = new ..(Rule1); int count = ksession.fireAllRules(filter); String name = personType.get( bob, name ); int age = personType.get( bob, age ); It would be great help if some one can show me the sample code for accessing RHS part of the Rule. Please let me know if you need more details. thanks Kiru -- View this message in context: http://drools.46999.n3.nabble.com/How-to-Access-Rule-RHS-THEN-Part-from-JAVA-tp4018651.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 ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] How to Access Rule RHS (THEN Part) from JAVA?
Thanks Lane. Since i am new to this Area, could you please help me with some sample code how to query the objects that are involved in a rule. Please consider above my example, on successful execution of Rule 1, i want to access the value of Percent from Class LoanFormula. Thanks a lot. -- View this message in context: http://drools.46999.n3.nabble.com/How-to-Access-Rule-RHS-THEN-Part-from-JAVA-tp4018651p4018654.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] How to Access Rule RHS (THEN Part) from JAVA?
DRL: LoanFormula percent; then percent = ...; = Java: ksession.fireAllRules(); LoanFormula percent = ksession.getGlobal( percent ); I suspect that your knowledge of Java is flawed since you can't have a class of your own and then assign a double to it: LoanFormula percent = 2.5 -W On 13/07/2012, Ravikiran ravikiran.kaka...@gmail.com wrote: Thanks Lane. Since i am new to this Area, could you please help me with some sample code how to query the objects that are involved in a rule. Please consider above my example, on successful execution of Rule 1, i want to access the value of Percent from Class LoanFormula. Thanks a lot. -- View this message in context: http://drools.46999.n3.nabble.com/How-to-Access-Rule-RHS-THEN-Part-from-JAVA-tp4018651p4018654.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 ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] How to Access Rule RHS (THEN Part) from JAVA?
If you change a fact and want to inspect it after firing all rules, use a query. There is an example in the Drools Expert manual. -W On 13/07/2012, Ravikiran ravikiran.kaka...@gmail.com wrote: Hi Laune, As i mentioned before, I have given some sample code only before. But i actually meant that percent is an instance variable of type double from class LoanFormula, sorry for creating the confusion. Both Person Loan formula classes are like this, declare Person age: Integer --- end declare LoanFormula percent: Double end If the above two classes are part of my Model and if my Rule 1 like below rule Rule 1 salience 10 dialect mvel when a : LoanFormula( ) exists (Person( age 25 )) then a.setPercent(2.5 ); end From the above Rule, When i fire Rule 1 from my Java client and i pass age of a Person greater than 25, then i should be able to retrieve the percent value as 2.5. I hope this would have been much clearer for you now. Thanks in advance... -- View this message in context: http://drools.46999.n3.nabble.com/How-to-Access-Rule-RHS-THEN-Part-from-JAVA-tp4018651p4018657.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 ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
