From: jkrupka <jkrupka(a)gmail.com&gt; Subject: [rules-users] Best approach for handling parallel requests for a stateful rules session To: rules-users(a)lists.jboss.org Date: Tuesday, March 8, 2011, 11:10 AM We've been over multiple ways of handling multiple parallel requests for a stateful rules session and I want to make sure the approach we have settled on makes sense. We will be getting multiple requests at a time to run some score calculation rules for various products.  In the past we used stateless rules sessions to do this and it worked fine.  In the newer version of our application we are using significantly more data to do our calculation and are pretty sure stateful is the way to go.  That being said, can we use the same session in multiple threads?  Based on our understanding, a session isn't inherently thread safe, so we are thinking we will need to do one of two things: 1. Synchronize all updates to facts and the calling of fireAllRules so that only one thread is doing this at a time.  Is this the best (or only safe) approach in this situation?  Since all fact updates and rules running in done in one thread, when is throughput a concern (obviously depends on hardware, # of rules, # of facts, etc)? 2. Ensure that only one thread updates the facts related to a given product at a time.  Multiple threads could still call fireAllRules at the same time, but after the rules finish, the calling class would grab the facts that would have been updated for just the product that it's interested in.  That way, it doesn't matter if the rules were technically matched in a different thread, as long as I'm grabbing just the data I'm interested in.   Is this a safe approach?  Does it end up offering more throughput capability than approach #1? Josh -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Best-approach-for-han... Sent from the Drools - User mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

From: jkrupka <jkrupka(a)gmail.com&gt; Subject: Re: [rules-users] Best approach for handling parallel requests for a stateful rules session To: rules-users(a)lists.jboss.org Date: Tuesday, March 8, 2011, 12:42 PM Took a look... thanks.  I'm not sure that they will help me though - do the async methods actually look to see if fireAllRules is already running somewhere else and synchronize the calls? Or do they just wrap a Callable around it so that if your rules take a long time to run you can do something else while they run? -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Best-approach-for-han... Sent from the Drools - User mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users