[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