Hi, I have a scenario where i have: - A listener that listens to a port and collects datapackets(Logs of Events) as they come and dumps to a DB. - consider the data that goes into my table is parsed, processed (meaningful, not raw anymore). Can Drools sit in between this listener and my DataBase to achieve the following : 1. Monitor the frequency of occurrence? Say if/when event 'X' occurs 'n' times in a 'z' time window? 2. ignore event 'X' until it occurs n times. 3. track a sequence of events - event X followed by event y within a fixed time window. (the RHS for any of these is, at the moment, not very consequential. i might just raise a flag or something to indicate something has happened...) My query is primarily to understand if this can be achieved. i may have around a million logs a day, but - only one event at a time is passed from the listener to Drools. Can drools hold the knowledge of previous facts(like count) into its working session? or does it require to store all these facts also? Should i be firing the rules whenever each log/event enters my system? or should i accumulate the day's facts ? (but i might have rules that need to catch conditions spreading over a few days ...) Some pointers or suggestions on this would be great! Thanks! -- View this message in context: http://www.nabble.com/Can-Drools-be-Used-for-this-application--tp23170278... 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

Thanks Nicolas, I looked into Drools-fusion over the weekend - interesting! i noticed that the events are wound around the clock in the example provided - is that so always? i would want my correlation to work with the time from timestamp that is already there as part of the fact. Any pointers on where i can get some more reading done on drools-fusion, with some more examples? Thanks again! Rishi Nicolas Héron wrote: > > Hello, > have you looked at the cep part of drools ? (drools-fusion) > it is exactly doing what you want with event. > You add an event caracteristic on an existing fact you insert in a > statefull > session > and you can have rules using time constraint > regards > Nicolas Heron > > 2009/4/22 cyphr <hrishikesh.varma(a)wipro.com&gt; > >> >> Hi, >> >> I have a scenario where i have: >> - A listener that listens to a port and collects datapackets(Logs of >> Events) as they come and dumps to a DB. >> - consider the data that goes into my table is parsed, processed >> (meaningful, not raw anymore). >> >> >> Can Drools sit in between this listener and my DataBase to achieve the >> following : >> >> 1. Monitor the frequency of occurrence? Say if/when event 'X' occurs 'n' >> times in a 'z' time window? >> 2. ignore event 'X' until it occurs n times. >> 3. track a sequence of events - event X followed by event y within a >> fixed >> time window. >> >> (the RHS for any of these is, at the moment, not very consequential. i >> might >> just raise a flag or something to indicate something has happened...) >> >> My query is primarily to understand if this can be achieved. >> i may have around a million logs a day, but - only one event at a time is >> passed from the listener to Drools. Can drools hold the knowledge of >> previous facts(like count) into its working session? or does it require >> to >> store all these facts also? >> >> Should i be firing the rules whenever each log/event enters my system? or >> should i accumulate the day's facts ? (but i might have rules that need >> to >> catch conditions spreading over a few days ...) >> >> Some pointers or suggestions on this would be great! >> Thanks! >> >> -- >> View this message in context: >> http://www.nabble.com/Can-Drools-be-Used-for-this-application--tp23170278... >> 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 >> > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > -- View this message in context: http://www.nabble.com/Can-Drools-be-Used-for-this-application--tp23170278... 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

Thanks again Nicholas! I did make my own little sample on that, had to check the trunk to get the newer docs... but yes, it appears to help my cause. One more question - if i have to pick up Drools Rules Language and start writing Event processing Rules, where would be good place to start ? considering that i have very little (or no) knowledge of Rule Engines in general? I find my self restricted, in the sense i cant express my requirments with my limited understanding in defining Rules. thanks again! Rishi Nicolas Héron wrote: > > Hello > You can set any attribute as the time clock > You have to add an annotation > It is in the fusion doc > Sorry for my late answer but I am on holidays :) > Regards > Nicolas > > 2009/4/27 cyphr <hrishikesh.varma(a)wipro.com&gt; > >> >> Thanks Nicolas, >> I looked into Drools-fusion over the weekend - interesting! >> i noticed that the events are wound around the clock in the example >> provided >> - is that so always? >> i would want my correlation to work with the time from timestamp that is >> already there as part of the fact. >> >> Any pointers on where i can get some more reading done on drools-fusion, >> with some more examples? >> >> Thanks again! >> Rishi >> >> >> Nicolas Héron wrote: >> > >> > Hello, >> > have you looked at the cep part of drools ? (drools-fusion) >> > it is exactly doing what you want with event. >> > You add an event caracteristic on an existing fact you insert in a >> > statefull >> > session >> > and you can have rules using time constraint >> > regards >> > Nicolas Heron >> > >> > 2009/4/22 cyphr <hrishikesh.varma(a)wipro.com&gt; >> > >> >> >> >> Hi, >> >> >> >> I have a scenario where i have: >> >> - A listener that listens to a port and collects datapackets(Logs of >> >> Events) as they come and dumps to a DB. >> >> - consider the data that goes into my table is parsed, processed >> >> (meaningful, not raw anymore). >> >> >> >> >> >> Can Drools sit in between this listener and my DataBase to achieve the >> >> following : >> >> >> >> 1. Monitor the frequency of occurrence? Say if/when event 'X' occurs >> 'n' >> >> times in a 'z' time window? >> >> 2. ignore event 'X' until it occurs n times. >> >> 3. track a sequence of events - event X followed by event y within a >> >> fixed >> >> time window. >> >> >> >> (the RHS for any of these is, at the moment, not very consequential. i >> >> might >> >> just raise a flag or something to indicate something has happened...) >> >> >> >> My query is primarily to understand if this can be achieved. >> >> i may have around a million logs a day, but - only one event at a time >> is >> >> passed from the listener to Drools. Can drools hold the knowledge of >> >> previous facts(like count) into its working session? or does it >> require >> >> to >> >> store all these facts also? >> >> >> >> Should i be firing the rules whenever each log/event enters my system? >> or >> >> should i accumulate the day's facts ? (but i might have rules that >> need >> >> to >> >> catch conditions spreading over a few days ...) >> >> >> >> Some pointers or suggestions on this would be great! >> >> Thanks! >> >> >> >> -- >> >> View this message in context: >> >> >> http://www.nabble.com/Can-Drools-be-Used-for-this-application--tp23170278... >> >> 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 >> >> >> > >> > _______________________________________________ >> > rules-users mailing list >> > rules-users(a)lists.jboss.org >> > https://lists.jboss.org/mailman/listinfo/rules-users >> > >> > >> >> -- >> View this message in context: >> http://www.nabble.com/Can-Drools-be-Used-for-this-application--tp23170278... >> 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 >> > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > -- View this message in context: http://www.nabble.com/Can-Drools-be-Used-for-this-application--tp23170278... 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