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

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(a)gmail.com&gt; > 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(a)gmail.com&gt; > >> 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 >> >> >> >> _______________________________________________ >> rules-users mailing list >> rules-users(a)lists.jboss.org >> https://lists.jboss.org/mailman/listinfo/rules-users >> >> > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users