Re: [rules-users] Drools - is dynamic change possible ?

Hi, The following is the block of code that i tried RuleBase ruleBase = readRule(); WorkingMemory workingMemory = ruleBase.newStatefulSession(false); // to keep reference // Create a message object workingMemory.insert( message ); workingMemory.fireAllRules(); When i try chaning the "drl" file at run time the change doesnt get reflected. Is there anything else i need to be doing here? Any additional jar files ? To have this change take effect at runtime - do i need to create a new session for each run or do i need to retain the session - i tried both "newStatefulSession(false)" and "newStatefulSession()" - get the same result with both. Just to add on...for two successive runs, the times taken to create RuleBase object were <<<<<<<< START >>>>>>>>>>1187339950422 <<<<<<<<<< FINISH >>>>>>>>>>>>>>>>.1187339956100 => ~ 6 seconds <<<<<<<< START >>>>>>>>>>1187340049090 <<<<<<<<<< FINISH >>>>>>>>>>>>>>>>.1187340049721 => ~ .6 seconds Doesnt this mean that there is a cache that prevents the modified drl file from being parsed ? Mark Proctor wrote: > > Yes this can be done at runtime. The RuleBase has a reference to each of > the created StatefulSessions that has not called dispose() yet and will > push those rule changes out to each running session. > > > Mark > pns77 wrote: >> Thanks for the response. >> >> Just to confirm when you say "...but you can remove a rule and add >> another >> in its place..." - can this be done at runtime - i.e server is running, >> i go >> add a new rule/change the output of an existing rule. If so, can i have >> the >> new rule take effect ? >> >> Also, do i need to include any specific jar file for this dynamic >> feature ? >> >> Am not looking at performance here - more from a >> maintenance/changeability >> point of view. >> >> >> Mark Proctor wrote: >> >>> you cannot change an individual rule, but you can remove a rule and add >>> another in its place. >>> >>> Mark >>> pns77 wrote: >>> >>>> Have been able to execute/run a sample Drools file >>>> >>>> import com.sample.Message; >>>> >>>> rule "Hello World" >>>> when >>>> m : Message( status == Message.HELLO, message : message, >>>> testStringExternal : testStringExternal ) >>>> then >>>> System.out.println( message ); >>>> m.setMessage( "Goodbye cruel world" ); >>>> System.out.println( testStringExternal + "Message.HELLO" ); >>>> m.setStatus( Message.GOODBYE ); >>>> update( m ); >>>> end >>>> >>>> Now, is it possible to change the logic dynamically at runtime ? Or is >>>> the >>>> drl file used only to externalize the business logic? I tried changing >>>> the >>>> message in drl file and it didnt get reflected >>>> >>>> Environment - RAD 6.0/jdk 1.4 >>>> >>>> Used the following set of jar files >>>> C:\Drools\libraries\drools-core.jar; >>>> C:\Drools\libraries\drools-compiler.jar; >>>> C:\Drools\libraries\mvel14.jar; >>>> C:\Drools\libraries\antlr-runtime.jar; >>>> C:\Drools\libraries\xstream.jar; >>>> C:\Drools\lib\core-3.2.3.v_686_R32x.jar; >>>> >>>> >>> _______________________________________________ >>> 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 > >