[rules-users] Performance differeneces using "before" or "after"

[Tina Vießmann]

  Hi,

I've mentioned the test case I'm working on before. It's: If a certain 
value exceeds a limit more than X times within Y minutes/hours, do 
something.
   ~> Count = X  ,  time = Y

During a talk with other developers it came up that by intuition the men 
would have chosen a other approach than the women. We can not agree if 
in Drools both approaches are the same in performance or if one is more 
performant.

    Male approach: If a new event with a limit violation is received,
    check if within the last time Y already X events with limit
    violations are contained in the knowledge base .

    Female approach: If a new event with a limit violation is received,
    check if the following events contain X events with limit violation.
    This is limited to a monitoring time of /maximal /Y. (If there have
    been X events registered, before the time Y is elapsed, the window
    will be closed right away.)


In code with Y = 1h it would be:
Male:

    // determine new event as $triggeringEvent
    $otherEvent : Value (this before[0ms,1h] $triggeringEvent)

Female:

    // determine event that opened the window as $triggeringEvent
    $otherEvent : Value (this after[0ms,1h] $triggeringEvent)


This is just a extract so that that the comments are in fact 
meaningless. The focus lies on _before_ and _after_.


Is one solution more efficient?


Thanks! :)
Tina

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