Hi Gurvinder, knowledge sessions are not thread-safe so I believe your assumptions are correct. To be on the safe side you should change the ksession bean to have scope "prototype".
Regards, Mattias ----- Original Message ----- > From: "Gurvinder Narula1" <[email protected]> > To: [email protected] > Sent: Tuesday, 27 November, 2012 3:08:18 PM > Subject: [rules-users] Question about drools-spring in a multi-treaded > container (like tomcat). > > Hello all, > > I've been reading up about drool-spring integration and have put > together a simple project that wires together a KnowledgeBase and > KnowledgeSession as follows : > > > < drools:resource id = "GroupUnit" type = "DRL" > source = > "file:/Users/drools/drools-spring-test/src/Rules/drls/GroupUnit.drl" > /> > > < drools:resource id = "GradeUnit" type = "DRL" > source = " > file:/Users/drools/drools-spring-test/src/Rules/drls/GradeUnit.drl" > " /> > > < drools:resource id = "EvaluateUnit" type = "DRL" > source = " file:/Users/drools/drools-spring-test/src/Rules/drls/ > EvaluateUnit .drl" " /> > > < drools:grid-node id = "node1" /> > < drools:kbase id = "kbase1" node = "node1" > > < drools:resources > > < drools:resource ref = "GroupUnit" /> > < drools:resource ref = "GradeUnit" /> > < drools:resource ref = "EvaluateUnit" /> > </ drools:resources > > </ drools:kbase > > > < drools:ksession id = "ksession" type = "stateful" kbase = "kbase1" > node = "node1" /> > ... > > The main question that I have is that – is this solution thread-safe > ? From what I understand of spring is that beans configured without > any additional qualifiers are inherently singletons. And when > deployed in a multi-theaded container like tomcat, Spring assumes > that the beans being severed up a thread-safe. So from I have read > is that KnowledeSessions are inherently not thread safe. So putting > the 2 together, I leaning towards the assessment that this above > solution is NOT thread safe and that if I do want it to be thread > safe I should set the StatefulKnowledgeSession to 'prototype' and > not leave it as a singleton. > > Please let me know if I'm missing anything in my assessment here ! > > Thanks in advance, > Gurvinder > > This message is intended only for the individual or entity to which > it is addressed. It may contain privileged, confidential information > which is exempt from disclosure under applicable laws. If you are > not the intended recipient, please note that you are strictly > prohibited from disseminating or distributing this information > (other than to the intended recipient) or copying this information. > If you have received this communication in error, please notify us > immediately by e-mail or by telephone at the above number. Thank > you. > _______________________________________________ > rules-users mailing list > [email protected] > https://lists.jboss.org/mailman/listinfo/rules-users > _______________________________________________ rules-users mailing list [email protected] https://lists.jboss.org/mailman/listinfo/rules-users
