Re: [rules-users] Using the drools as the backend engine for a service

Obviously you know your requirments better than I, but the following stateless example accommodates dynamic insertion of facts:- *DRL* package com.test import com.test.Fact1; import com.test.Fact2; rule "Fact1" when Fact1() then System.out.println("Fact1"); insert(new Fact2()); end rule "Fact2" when Fact2( ) then System.out.println("Fact2"); end *Java* StatelessSession session = ruleBase.newStatelessSession(); session.execute(new Fact1()); *Console* Fact1 Fact2 Are you getting (general) stateless sessions confused with sequential stateless sessions? With kind regards, Mike ------------------------------ *From:* rules-users-bounces(a)lists.jboss.org [mailto: rules-users-bounces(a)lists.jboss.org] *On Behalf Of *Jai Vasanth *Sent:* 04 February 2008 21:02 *To:* Rules Users List *Subject:* Re: [rules-users] Using the drools as the backend engine for a service As part of the rules evaluation, more objects are inserted into the working memory. Even though I just insert 1 object after creating a session, rule outcomes inside lead to more objects to be inserted. Correct me if I am wrong, but I was under the impression that a stateless wouldnt be able to automatically fire rules when we objects are inserted dynamically Thanks Jai On Feb 4, 2008 1:05 AM, Anstis, Michael (M.) <manstis1(a)ford.com&gt; wrote: > IMHO, you might achieve better scalability and resilience if you can > make the working memory stateless. > > I assume your "service" to be a web-service over stateless-HTTP and not > a service exposed over a stateful protocol. > > Cheers, > > Mike > > ------------------------------ > *From:* rules-users-bounces(a)lists.jboss.org [mailto: > rules-users-bounces(a)lists.jboss.org] *On Behalf Of *Jai Vasanth > *Sent:* 01 February 2008 22:05 > *To:* Rules Users List > *Subject:* Re: [rules-users] Using the drools as the backend engine for > a service > > I must have not been clear, yes I was planning on instantiating the > rulebase when the service starts and instantiating a new session for every > request. > > > > ONCE: > > RuleBase ruleBase = RuleBaseFactory.newRuleBase(); > ruleBase.addPackage( pkg ); > > PER REQUEST: > Stateful session = ruleBase.newStatefulSession(); (Is this what you > were referring to as working memory ? ) > > > I hope that looks ok. > > Thanks > > Jai > On Feb 1, 2008 1:37 PM, Michael Rhoden <mrhoden(a)franklinamerican.com&gt; > wrote: > > > You would likely NOT want to create a rulebase per session. Most > > people create working memory per session. Rulebases should only be loaded > > once per server (context) in my opinion, and you reload it as rules changes. > > Loading a rulebase loads rules from a file, and orders your rete tree. For > > our installation that takes several minutes. > > > > > > > > Rulebase = once > > > > Working memory = per user/transaction > > > > > > > > -Michael > > > > > > ------------------------------ > > > > *From:* rules-users-bounces(a)lists.jboss.org [mailto: > > rules-users-bounces(a)lists.jboss.org] *On Behalf Of *Jai Vasanth > > *Sent:* Friday, February 01, 2008 3:23 PM > > *To:* Rules Users List > > *Subject:* [rules-users] Using the drools as the backend engine for a > > service > > > > > > > > Hi, > > > > I am planning on using Drools as the rules engine for a service that > > I am building. I am considering instantiating a stateful session for every > > request to the service. The RuleBase would be created when the service > > starts. Is this the correct way to go about incorporating Drools in a > > service ? Is session creation an expensive process and if so are there other > > efficient ways of doing so ? > > > > > > > > Thanks > > > > Jai > > > > _______________________________________________ > > 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 > > _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users