Hello, Unless the Drools team have a "secret optimisation" *I think* there is no other way to insert large numbers of facts. Think about it; every fact you insert will need to be propagated through the RETE network in order for the correct rules to be activated. You could however optimise your rules to ensure the facts are processed as efficiently as possible. For example if you are interested in DataClasses where "line" is not empty you should have the RHS pattern that checks for this before other RHS patterns in rules. This should ensure the fact is not propagated through the network further than is really necessary. I believe Drools does this itself when the RETE network is built by have specialised "Object" nodes that filter out classes you have not consumed in RHS patters (so if you insert a Foo class into WM and your rules only use Bar classes the Foo class does not propagate further). With kind regards, Mike -----Original Message----- From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Senlin Liang Sent: 05 February 2009 20:06 To: rules-users(a)lists.jboss.org Subject: [rules-users] one question about asserting facts Hi all, I am trying to assert (or insert) a large number of facts (or DataClass objects) in to a session, what i am doing right now is to insert them one by one as --------------------- while (line != null) { str = bufRead.readLine(); session.insert(new DataClass(line, str)); line = bufRead.readLine(); } --------------------- My question: is there an efficient way to insert all facts at once, so that it takes less time? Thanks, Senlin _______________________________________________ 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