Re: [rules-users] Fw: Some Querries on Drools

Thanks a lot Randhish!!! Stateful sessions will have to be disposed. But what if the sessions are taking too long, same with the case of stateless sessions, then what to do in that case. Also in the multi- threaded environment, if I have 10 - 100 Ks of threads, will the rule engines performance be still better. Thanks & Regards, Sumeet Karawal Mailto: sumeet.karawal(a)tcs.com From: Randhish Raghavan <Randhish_Raghavan(a)mindtree.com&gt; To: Rules Users List <rules-users(a)lists.jboss.org&gt; Date: 04/19/2011 08:51 PM Subject: Re: [rules-users] Fw: Some Querries on Drools Sent by: rules-users-bounces(a)lists.jboss.org Hi, I am quite new to drools but I will try to answer your questions. I don't think Drools will cause your application to crash if you ensure 1. You develop rules that will not result in infinite loops. 2. Dispose sessions if you are using Stateful sessions. Basically, you would want to create the Knowledge base once i.e. during application startup. You will create a new Session (not an expensive operation) for every request. In this scenario it will be better to use stateless sessions as you do not have to worry about disposing them. However, if you want to use statefull sessions, you might want to write a set of wrapper classes that provide api's to manage the statefull session and execute rules. Developers will only be allowed to access api's that execute rules and will not have access to api's that create and dispose a session. To you next question on making changes to rules, You have to create a KnowledgeAgent that checks if the rule resource has been modified at configured intervals. The rule resource (drl,pkg etc) can exist on the file system or you want to try to configure rules in guvnor. Guvnor is a GUI tool that allows you to manage rules. Regards, Randhish -----Original Message----- From: rules-users-bounces(a)lists.jboss.org [ mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Sumeet Karawal Sent: Tuesday, April 19, 2011 2:53 PM To: rules-users(a)lists.jboss.org Subject: [rules-users] Fw: Some Querries on Drools Hi Everybody, I had posted this earlier. It would be very greatful if anybody could help me on these queries, any suggestions or any document that I can refer to. Thanks and Regards, Sumeet Karawal Mailto: sumeet.karawal(a)tcs.com From: Sumeet Karawal/MUM/TCS To: rules-users(a)lists.jboss.org Date: 04/18/2011 06:58 PM Subject: Some Querries on Drools Hello All, I have some queries regarding use of drools as rule engine for my Application. It would be very helpful if I get some guidance regarding these: 1) I have an application in which a user logs in, and according to his profile he is provided with some benefits, and rule engine check for the eligibility criteria. But if hundreds of thousands of user will log in at same time, then what will be the performance accordingly. Like, these concurrent users hitting the server, and so many threads will be generated and many number of rules will be fired in the session. Will this hamper the performance of Rule Engine. 2) Suppose I have an application using drools. I create EAR / WAR file of that application and deploy it on some other system. Would it be still possible for me to change the rules on the fly. Or some dependencies might have to be managed. 3) How can we manage sessions in drools? Suppose we are having different stateful sessions in our application, but time consumption when we fireAllRules() exceeds the expected time. So is there a mechanism to kill, restart the session in drools. Could I get some help/document regarding session Management on drools. Thanks & Regards, Sumeet Karawal Mailto: sumeet.karawal(a)tcs.com =====-----=====-----===== Notice: The information contained in this e-mail message and/or attachments to it may contain confidential or privileged information. If you are not the intended recipient, any dissemination, use, review, distribution, printing or copying of the information contained in this e-mail message and/or attachments to it are strictly prohibited. If you have received this communication in error, please notify us by reply e-mail or telephone and immediately and permanently delete the message and any attachments. 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