[rules-users] Concurrent rule fire

Hi, folks, My project will handle about 1.5 M transactions per hour using Drools and the rules' fire are scheduled based on business operation cycle which might happen a few times a day. Say if I need to fire the same rule set twice at 10:00 PM and midnight. What will happen if the first execution has not completed till midnight? Will the 2nd execution be held up till the 1st is completed? I would assume there might still be transactions inserted into working memory between 10:00 PM and midnight although it is very few. My understanding is Drools will enforce only one active thread is working for the same "then" section for data consistency. Any thoughts? Best Abe