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

[赵侃侃]

Thanks Wolfgang,

It now starts to make sense to me. However, is it possible that I don't
retract those matched eventA? All those events might be used to evaluate
against other rules.

Thanks again,
Kevin Zhao

2010/10/25 Wolfgang Laun <wolfgang.laun at gmail.com>

> 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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>>
>>
>
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