[rules-users] How to write a rule like this

[Wolfgang Laun]

I assume you are using Fusion, using a session clock so that temporal
operators are available.

rule "three A"
when
  $a1: EventA( $index : index )
  $a2: EventA( index == $index )
  $a3: EventA( index == $index )
  not EventB( this after[0ms] $a1 && before[0ms] $a3, index == $index )
then
  // ... match
  retract( $a1 );
  retract( $a2 );
  retract( $a3 );
end

-W

2010/10/25 赵侃侃 <kevin223 at gmail.com>

> Hello,
>
> I'm still quite new to the drools stuffs just getting the examples running.
> I'm sorry if my question is too basic.
> I have a system that will continuously to receive events sent from some
> other system. Basically I have two types of events, eventA and eventB.
> Both eventA and eventB have two properties, index and timestamp.
>
> What I want is to capture a pattern to meet the following conditions
>
> 1. every 3 consecutive eventsA without any eventB in between having a same
> index value ordering by their timestamp.
>
> 2. all events in a matched pattern will have the same value of property
> index.
>
> 3. if a pattern is matched, any of the events in this pattern should not be
> used again for a new matching.
>
> there are some examples below, the number after a colon stands for the
> value of its index number and assume those events are already ordered by
> their timestamp.
>
> eventB:2    eventA:1     eventA:1     eventA:1  eventB:3      --------- one
> successful match, we have three eventA with same index value 1 in a row
>
> eventB:2    eventA:1     eventA:1     eventB:1  eventA:1      --------- no
> match because there's an eventB in between
>
> eventB:2    eventA:1     eventA:1     eventB:2  eventA:1      --------- one
> successful match because the in-between eventB has a different index value
>
> eventA:1    eventA:1     eventA:1     eventA:1  eventA:1      ---------
> only one match, because once matched, the events can not be used for a
> second match again.
>
>
> I just don't know how to write a rule like this. Is there anyone who can
> shed some lights on?
>
> Best Regards,
> Kevin
>
>
>
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