And, I hope, it doesn't matter in which order the Events A with id x are matched with Events B with the same id.<br><br>The idea of my approach is to make the Events A, B, C not directly visible to the rule ABC but through a "filter" fact, one per type (A, B. C) and per id. <br>
<br>Here is the abstract base class for the filter fact; Event is the base class for the three EventA/B/C (or use Object).<br><br>package event;<br>import java.util.*;<br>public abstract class EventList {<br> private String id;<br>
private List<Event> list;<br> public EventList( int id ){<br> <a href="http://this.id">this.id</a> = "" + id;<br> list = new ArrayList<Event>();<br> }<br> public String getId(){<br>
return id;<br> }<br> public int size(){<br> return list.size();<br> } <br> public void add( Event event ){<br> list.add( event );<br> }<br> public void delFirst(){<br> list.remove( 0 );<br>
}<br>}<br><br>Here is the insertion:<br><br> long t0 = System.currentTimeMillis();<br> int limit = 10;<br> EventListA[] aList = new EventListA[limit];<br> EventListB[] bList = new EventListB[limit];<br>
EventListC[] cList = new EventListC[limit];<br> int count = 100;<br> for( int i = 0; i < limit; i++ ){<br> aList[i] = new EventListA( i );<br> bList[i] = new EventListB( i );<br>
cList[i] = new EventListC( i );<br> for( int j = 0; j < count; j++ ){<br> EventA eventA = new EventA( i );<br> aList[i].add( eventA );<br> session.insert( eventA );<br>
EventB eventB = new EventB( i );<br> bList[i].add( eventB );<br> session.insert( eventB );<br> EventC eventC = new EventC( i );<br> cList[i].add( eventC );<br>
session.insert( eventC );<br> }<br> session.insert( aList[i] );<br> session.insert( bList[i] );<br> session.insert( cList[i] );<br> } <br> session.fireAllRules();<br>
long t1 = System.currentTimeMillis();<br> System.out.println( "id limit " + limit + ", execution of " + count + " identical triples: " + (double)(t1-t0)/1000.0 );<br><br>Here's the rules:<br>
<br>rule ABC<br>when<br> $a : EventListA( $aid: id, size > 0 )<br> $b : EventListB(id == $aid, size > 0 )<br> $c : EventListC(id == $aid, size > 0 )<br>then<br> $a.delFirst();<br> update( $a );<br> $b.delFirst();<br>
update( $b );<br> $c.delFirst();<br> update( $c );<br> // …(actions)<br>end<br><br>rule killEmtpyList<br>when<br> $el: EventList( $id : id, size == 0 )<br>then<br> System.out.println( "retracted " + $el.getClass().getSimpleName() + $id );<br>
retract( $el );<br>end<br><br>There are a couple of things to watch out for, and to refine.<br>* You may want to keep track of existing EventListX in maps, or use a couple of rules to create and add new EventX to their EventListX.<br>
* Perhaps another collection type is more efficient than ArrayList; depends on how many Xs with identical ids you expect.<br>* make sure to update after EventList.add and .delFirst, also when doing it in Java code. (My insert sequence inserts the completed EventList.)<br>
<br>An entirely different approach might be possible using temportal operators, provided the events have distinct timestamps:<br> $a: EventA( $id : id, marked == false )<br> not EventA( if == $id, this before $a, marked == false )<br>
// same for B, C<br>but here you'll have to retract the "winners" or else mark them as matched.<br><br>HTH<br>-W<br><br><br><div class="gmail_quote">2010/11/15 Roess. Oliver <span dir="ltr"><<a href="mailto:o.roess@seeburger.de">o.roess@seeburger.de</a>></span><br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div link="blue" vlink="purple" lang="DE"><font size="1" color="#808080" face="Arial"></font><br>
<div>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;" lang="EN-GB">Hello again!</span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;" lang="EN-GB"> </span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;" lang="EN-GB">Thanks for the heads up, Wolfgang. </span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;" lang="EN-GB"> </span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;" lang="EN-GB">Basically, what I try to create is some sort of batch
window, which is not really implemented into Drools Fusion if I remember correctly.</span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;" lang="EN-GB">It doesn’t HAVE to be A, B, C in that particular
order which I specified in my last post, but the rule shall only match each A,
each B, and each C once. So what would you recommend as a best practise to
build that rule? Or is my rule correct? Actually, I don’t like the fact,
that I have to complete the rule by retracting my events in the RHS of the rule.
I’d rather have a batch window specified in the LHS. Thanks in advance.</span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;" lang="EN-GB"> </span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;" lang="EN-GB">Best regards,</span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;" lang="EN-GB">Oliver</span></font></p><font color="#888888">
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<td width="272"><font size="1" color="#808080" face="Arial"><b>SEEBURGER AG</b></font></td>
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<td><font size="1" color="#808080" face="Arial">Vorstand/Seeburger Executive Board:</font></td>
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<td width="272"><font size="1" color="#808080" face="Arial">Sitz der Gesellschaft/Registered Office:</font></td>
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<td><font size="1" color="#808080" face="Arial">Bernd Seeburger, Axel Haas, Michael Kleeberg</font></td>
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<td width="272"><font size="1" color="#808080" face="Arial">D-75015 Bretten</font></td>
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<td width="272"><font size="1" color="#808080" face="Arial">Tel.: 07252 / 96 - 0</font></td>
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<td><font size="1" color="#808080" face="Arial">Dr. Franz Scherer</font></td>
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<td width="272"><font size="1" color="#808080" face="Arial">Fax: 07252 / 96 - 2222</font></td>
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<td width="272"><font size="1" color="#808080" face="Arial">Internet: <a href="http://www.seeburger.de" target="_blank">http://www.seeburger.de</a></font></td>
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