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Advance EPL : Lookup absence of a past event after an event is matched

Question asked by Amer Zaman on Jan 25, 2018

Hi , I am working on an Esper rule logic in Netewitness Logs and Packets which is as follows. 

The event stream waits for an event ,say event B , as soon as it finds it , the stream looks historically in the last 10 mins to find an event say ,event A . If event A does not exist , the rule is triggered. 

My limited research led me to believe that i will be using a named window or a snap shot (fire and forget) query.


Any idea how will this logic look it ?