[rules-users] Create rules programatically

Hi, Can someone point me in the direction of documentation or code examples for the following? I want to programatically create rules for execution, e.g. within my application I will hold criteria which users will define, at runtime I would like to build a component to extract these values (from my app database) and build rules based on those values. Everything I've seen so far seems to talk about using DRL files, ideally I want to programatically create the entire rule in Java, and then call Drools to execute my rule set. Thanks,