[rules-users] Is my use case suuported in Drools?

[Elran Dvir]

Hi all,

I am new to drools and I'm trying to understand whether the following use case is supported - any help on the following will be greatly appreciated:

I would like to create a new event based on multiple events (all of the same type meeting a set of conditions) occurring over a given period of time T1.
For each combination of values for fieldA and fieldB, a new group of event candidates should be opened (fieldA and fieldB are group by fields. Each combination of values of these fields, should be treated separately).
The event should be created when at least X events occurred over the period. Count the events based on unique values of fieldC and fieldD (for a given combination of fieldA and fieldB, if you notice an event with already existing values of the combination of fieldC and fieldD, it should not be counted).
If all conditions described above are met, create the desired new event. The new event will stay open for duration of T2, and update will be sent for it every T3.

Aside from the above, I need an aggregation function (besides count) of "collect" : in the new event the value of fieldE will be the collection of (preferably distinct) values of fieldE in originating events.

Example:
Port scan event - the basic event is connection. For each combination of source_ip and destination_ip (group by fields), detect a port scan event if over a minute (T1) there more than 20 (X) events with different ports (unique field).
The event will stay open for 10 minutes (T2) and an update will be sent every 1 minute (T3). Every update will contain the count of events, source_ip, destination_ip and collection of services.

Thanks a lot.

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