I got the following scenario: - I need a Web Service that reasons over received sensor events (1000+ per day and client) in realtime and send messages if certain patterns occur. - The web service has many clients (100-1000) but their events / facts do not interfere (each client has his own state and events that change his state). - Each client also has his own rules (10-100) (but they are parameterized generic rules - I thought maybe I could use rule templates or DSL to let clients individualize their rules). - Some rules are time dependant (e.g. if event (type=x) does not occour at least within half an hour after 8:00 a.m. (where 8 o'clock is a rule parameter) -> send a message), others are accumulative (e.g. if number of events within 5h is > 3). I'd like to use drools CEP for this. I already read some documentation and tutorials but my first examples do not really work as I expected. Now I fear to have some general misconception about Drools/CEP. If someone could have a look over my ideas, I'd be very glad! How I would do it: -> Every client would have his own KnowledgeBase with his (individualized) rules. Rules would be stored in guvnor or on a mysql database as plain text. -> Every client would have his own KnowledgeBase / StatefullKnowledgeSession on the service, that knows about recent sensor events and some facts about the client. Events automatically are disposed of once they are not relevant anymore. -> A static hashmap will hold references to the session for each client. (clientID -> KnowledgeSession) -> Sessions are created when a new client joins the system, but are normally not disposed unless the client completely leaves the system. -> When a new Event is received (HTTP PUT), the session corresponding to the client would be retrieved from the HashMap and the new event would be inserted via an event stream. Then (for every new event) session.fireAllRules() would be called on the clients KnowledgeSession. -> The Knowledge Base would run in STREAM mode to be able to reason over time windows and automatically expire (=delete?!) events. This would keep memory usage in within bounds(?) -> pseudo clock allows me to write tests or simulate the system with records of old events. (Is it possible to test timer, cron and sliding-window rules with pseudo clock? Can I explicitly set the time of the pseudo clock?) I appreciate your help! -- View this message in context: http://drools.46999.n3.nabble.com/A-Drools-CEP-Scenario-did-I-get-it-righ... Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

The question is more or less where to begin. 1. If there is a Fact in working memory (e.g. "Person") and I invoke fireAllRules() twice, I would expect to have the following rule fire both times: rule "alwaysFire" when $room : Room( ) then System.out.println("there is a room"); end I would also expect this rule to fire every time I invoke fireAllRules() rule "alwaysFire2" when then System.out.println("always!"); end Both rules fire only once (the first time) even though the Working Memory is the same. (The room still exists...). I expected the rule to fire each time fireAllRules() is invoked and for the number of Rooms e.g. with 4 rooms -> 4x output "there is a room". 2. It seems to be impossible to set the pseudo clock to a specific time. How can I test CRON timer rules?! On 08.09.2013, at 18:51, Michael Anstis <michael.anstis(a)gmail.com&gt; wrote: > What did not happen as you expected? > > The HTTP session to Knowledge session association seems reasonable; but I > assume you are trying with a more simple configuration initially. > > Sent on the move > > On 8 Sep 2013 17:42, "amarok" <mail(a)alexander-wolf.net&gt; wrote: > I got the following scenario: > - I need a Web Service that reasons over received sensor events (1000+ > per > day and client) in realtime and send messages if certain patterns occur. > - The web service has many clients (100-1000) but their events / facts do > not interfere (each client has his own state and events that change his > state). > - Each client also has his own rules (10-100) (but they are parameterized > generic rules - I thought maybe I could use rule templates or DSL to let > clients individualize their rules). > - Some rules are time dependant (e.g. if event (type=x) does not occour > at > least within half an hour after 8:00 a.m. (where 8 o'clock is a rule > parameter) -> send a message), others are accumulative (e.g. if number of > events within 5h is > 3). > > > I'd like to use drools CEP for this. I already read some documentation > and > tutorials but my first examples do not really work as I expected. Now I > fear > to have some general misconception about Drools/CEP. If someone could have > a > look over my ideas, I'd be very glad! > > > How I would do it: > -> Every client would have his own KnowledgeBase with his > (individualized) > rules. Rules would be stored in guvnor or on a mysql database as plain > text. > -> Every client would have his own KnowledgeBase / > StatefullKnowledgeSession > on the service, that knows about recent sensor events and some facts > about > the client. Events automatically are disposed of once they are not > relevant > anymore. > -> A static hashmap will hold references to the session for each client. > (clientID -> KnowledgeSession) > -> Sessions are created when a new client joins the system, but are > normally > not disposed unless the client completely leaves the system. > -> When a new Event is received (HTTP PUT), the session corresponding to > the > client would be retrieved from the HashMap and the new event would be > inserted via an event stream. Then (for every new event) > session.fireAllRules() would be called on the clients KnowledgeSession. > > -> The Knowledge Base would run in STREAM mode to be able to reason over > time windows and automatically expire (=delete?!) events. This would keep > memory usage in within bounds(?) > -> pseudo clock allows me to write tests or simulate the system with > records > of old events. (Is it possible to test timer, cron and sliding-window > rules > with pseudo clock? Can I explicitly set the time of the pseudo clock?) > > I appreciate your help! > > > > > > > > > > > > -- > View this message in context: > http://drools.46999.n3.nabble.com/A-Drools-CEP-Scenario-did-I-get-it-righ... > Sent from the Drools: User forum mailing list archive at Nabble.com. > _______________________________________________ > 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