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

[Michael Anstis]

You could try this too; if you don't want lots of new attributes for your
model:-

rule "three A"
when
  $a1: EventA( $index : index )
  $a2: EventA( index == $index )
  $a3: EventA( index == $index )
  not PatternConsumer( name == 'AAA', events contain $a1 || contais $a2 ||
contains $a3)
  not EventB( this after[0ms] $a1 && before[0ms] $a3, index == $index )
then
  // ... match
  PatternConsumer pc = new PatternConsumer("AAA", $a1, $a2, $a3 );
  insert(pc);
end


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

> Giving those other rules a higher salience is one way, but I think
> it is better to add a boolean field "usedForAAA" to class EventA.
>
> rule "three A"
> when
>   $a1: EventA( $index : index, usedForAAA == false )
>   $a2: EventA( index == $index, usedForAAA == false )
>   $a3: EventA( index == $index, usedForAAA == false )
>
>   not EventB( this after[0ms] $a1 && before[0ms] $a3, index == $index )
> then
>   // ... match
>   modify( $a1 ){ setUsedForAAA( true ) }
>   modify( $a2 ){ setUsedForAAA( true ) }
>   modify( $a3 ){ setUsedForAAA( true ) }
>
> end
>
> -W
>
>
> 2010/10/25 赵侃侃 <kevin223 at gmail.com>
>
>> 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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>>>> rules-users at lists.jboss.org
>>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>>
>>>>
>>>
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>>
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>
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