It works now. It's my fault that I defined an entry point and I used that as the source but just missed that part in the Not conditional clause for the EventB constraints. In that case, the constraints for EventB does not take effect. Thanks everyone who helped and much appreciated!<div>
<br></div><div>Best Regards,</div><div>Kevin Zhao<br><br><div class="gmail_quote">在 2010年10月27日 上午12:08，Wolfgang Laun <span dir="ltr"><<a href="mailto:wolfgang.laun@gmail.com">wolfgang.laun@gmail.com</a>></span>写道：<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div class="im">2010/10/26 赵侃侃 <<a href="mailto:kevin223@gmail.com">kevin223@gmail.com</a>>:<br>
</div><div class="im">> It's getting closer now but still has one problem that it reports for a<br>
> pattern match where there's an EventB with same index value in between.<br>
> The Testing events feed pattern that I use can be described as below:<br>
> EventA:0 EventB:1 EventA:0 EventB:1 EventA:1 EventB:0 EventA:0<br>
> here it reports for a pattern match where it shouldn't EventB:1<br>
<br>
</div>This works for me, i.e., no match is reported, using the rule<br>
<div class="im"><br>
rule "three A"<br>
when<br>
$a1: EventA( $index : index )<br>
</div> $a2: EventA( index == $index, this != $a1 && after[0s] $a1 )<br>
$a3: EventA( index == $index, this != $a1 && != $a2 && after[0s] $a2 )<br>
## not PatternConsumer( id == "AAA", events contains $a1 || contains<br>
<div class="im">$a2 || contains $a3 )<br>
<br>
not EventB( this after[0ms] $a1 && before[0ms] $a3, index == $index )<br>
then<br>
</div> System.out.println( "AAA match " + $index );<br>
<div><div></div><div class="h5"> PatternConsumer pc = new PatternConsumer("AAA", $a1, $a2, $a3 );<br>
insert( pc );<br>
end<br>
<br>
<br>
<br>
> Best Regards,<br>
> Kevin Zhao<br>
><br>
> 在 2010年10月26日 下午4:33，Wolfgang Laun <<a href="mailto:wolfgang.laun@gmail.com">wolfgang.laun@gmail.com</a>>写道：<br>
>><br>
>> If there may be two EventA with the same timestamp, additional<br>
>> constraints may be necessary, and<br>
>> after may have to be used with a start time of 0ms:<br>
>><br>
>> $a1: EventA( $index : index )<br>
>> $a2: EventA( this != $a1 && after[0ms] $a1, index == $index )<br>
>> $a3: EventA( this != $a1 && != $a2 && after[0ms] $a2, index == $index )<br>
>><br>
>> -W<br>
>><br>
>><br>
>> 2010/10/26 赵侃侃 <<a href="mailto:kevin223@gmail.com">kevin223@gmail.com</a>>:<br>
>> > Hello,<br>
>> > Hello,<br>
>> > I just tried this rule, but it doesn't seem to work as expected.<br>
>> > What I have now is every time I have an EventA received then a pattern<br>
>> > is<br>
>> > reported matched no matter whether any of the other constrains is met.<br>
>> > Any ideas?<br>
>> > Best Regards,<br>
>> > Kevin Zhao<br>
>> ><br>
>> > 2010/10/26 Michael Anstis <<a href="mailto:michael.anstis@gmail.com">michael.anstis@gmail.com</a>><br>
>> >><br>
>> >> You could try this too; if you don't want lots of new attributes for<br>
>> >> your<br>
>> >> model:-<br>
>> >><br>
>> >> rule "three A"<br>
>> >> when<br>
>> >> $a1: EventA( $index : index )<br>
>> >> $a2: EventA( index == $index )<br>
>> >> $a3: EventA( index == $index )<br>
>> >> not PatternConsumer( name == 'AAA', events contain $a1 || contais $a2<br>
>> >> ||<br>
>> >> contains $a3)<br>
>> >> not EventB( this after[0ms] $a1 && before[0ms] $a3, index == $index )<br>
>> >> then<br>
>> >> // ... match<br>
>> >> PatternConsumer pc = new PatternConsumer("AAA", $a1, $a2, $a3 );<br>
>> >> insert(pc);<br>
>> >> end<br>
>> >><br>
>> >><br>
>> >> 2010/10/25 Wolfgang Laun <<a href="mailto:wolfgang.laun@gmail.com">wolfgang.laun@gmail.com</a>><br>
>> >>><br>
>> >>> Giving those other rules a higher salience is one way, but I think<br>
>> >>> it is better to add a boolean field "usedForAAA" to class EventA.<br>
>> >>><br>
>> >>> rule "three A"<br>
>> >>> when<br>
>> >>> $a1: EventA( $index : index, usedForAAA == false )<br>
>> >>> $a2: EventA( index == $index, usedForAAA == false )<br>
>> >>> $a3: EventA( index == $index, usedForAAA == false )<br>
>> >>> not EventB( this after[0ms] $a1 && before[0ms] $a3, index == $index<br>
>> >>> )<br>
>> >>> then<br>
>> >>> // ... match<br>
>> >>> modify( $a1 ){ setUsedForAAA( true ) }<br>
>> >>> modify( $a2 ){ setUsedForAAA( true ) }<br>
>> >>> modify( $a3 ){ setUsedForAAA( true ) }<br>
>> >>> end<br>
>> >>><br>
>> >>> -W<br>
>> >>><br>
>> >>><br>
>> >>> 2010/10/25 赵侃侃 <<a href="mailto:kevin223@gmail.com">kevin223@gmail.com</a>><br>
>> >>>><br>
>> >>>> Thanks Wolfgang,<br>
>> >>>> It now starts to make sense to me. However, is it possible that I<br>
>> >>>> don't<br>
>> >>>> retract those matched eventA? All those events might be used to<br>
>> >>>> evaluate<br>
>> >>>> against other rules.<br>
>> >>>> Thanks again,<br>
>> >>>> Kevin Zhao<br>
>> >>>> 2010/10/25 Wolfgang Laun <<a href="mailto:wolfgang.laun@gmail.com">wolfgang.laun@gmail.com</a>><br>
>> >>>>><br>
>> >>>>> I assume you are using Fusion, using a session clock so that<br>
>> >>>>> temporal<br>
>> >>>>> operators are available.<br>
>> >>>>><br>
>> >>>>> rule "three A"<br>
>> >>>>> when<br>
>> >>>>> $a1: EventA( $index : index )<br>
>> >>>>> $a2: EventA( index == $index )<br>
>> >>>>> $a3: EventA( index == $index )<br>
>> >>>>> not EventB( this after[0ms] $a1 && before[0ms] $a3, index ==<br>
>> >>>>> $index )<br>
>> >>>>> then<br>
>> >>>>> // ... match<br>
>> >>>>> retract( $a1 );<br>
>> >>>>> retract( $a2 );<br>
>> >>>>> retract( $a3 );<br>
>> >>>>> end<br>
>> >>>>><br>
>> >>>>> -W<br>
>> >>>>><br>
>> >>>>> 2010/10/25 赵侃侃 <<a href="mailto:kevin223@gmail.com">kevin223@gmail.com</a>><br>
>> >>>>>><br>
>> >>>>>> Hello,<br>
>> >>>>>> I'm still quite new to the drools stuffs just getting the examples<br>
>> >>>>>> running. I'm sorry if my question is too basic.<br>
>> >>>>>> I have a system that will continuously to receive events sent from<br>
>> >>>>>> some other system. Basically I have two types of events, eventA and<br>
>> >>>>>> eventB.<br>
>> >>>>>> Both eventA and eventB have two properties, index and timestamp.<br>
>> >>>>>> What I want is to capture a pattern to meet the following<br>
>> >>>>>> conditions<br>
>> >>>>>> 1. every 3 consecutive eventsA without any eventB in between having<br>
>> >>>>>> a<br>
>> >>>>>> same index value ordering by their timestamp.<br>
>> >>>>>> 2. all events in a matched pattern will have the same value of<br>
>> >>>>>> property index.<br>
>> >>>>>> 3. if a pattern is matched, any of the events in this pattern<br>
>> >>>>>> should<br>
>> >>>>>> not be used again for a new matching.<br>
>> >>>>>> there are some examples below, the number after a colon stands for<br>
>> >>>>>> the<br>
>> >>>>>> value of its index number and assume those events are already<br>
>> >>>>>> ordered by<br>
>> >>>>>> their timestamp.<br>
>> >>>>>> eventB:2 eventA:1 eventA:1 eventA:1 eventB:3<br>
>> >>>>>> --------- one successful match, we have three eventA with same<br>
>> >>>>>> index value<br>
>> >>>>>> 1 in a row<br>
>> >>>>>> eventB:2 eventA:1 eventA:1 eventB:1 eventA:1<br>
>> >>>>>> --------- no match because there's an eventB in between<br>
>> >>>>>> eventB:2 eventA:1 eventA:1 eventB:2 eventA:1<br>
>> >>>>>> --------- one successful match because the in-between eventB has a<br>
>> >>>>>> different index value<br>
>> >>>>>> eventA:1 eventA:1 eventA:1 eventA:1 eventA:1<br>
>> >>>>>> --------- only one match, because once matched, the events can not<br>
>> >>>>>> be used<br>
>> >>>>>> for a second match again.<br>
>> >>>>>><br>
>> >>>>>> I just don't know how to write a rule like this. Is there anyone<br>
>> >>>>>> who<br>
>> >>>>>> can shed some lights on?<br>
>> >>>>>> Best Regards,<br>
>> >>>>>> Kevin<br>
>> >>>>>><br>
>> >>>>>><br>
>> >>>>>> _______________________________________________<br>
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</div></div></blockquote></div><br></div>