Thanks Wolfgang,<div><br></div><div>It now starts to make sense to me. However, is it possible that I don&#39;t retract those matched eventA? All those events might be used to evaluate against other rules.</div><div><br></div>
<div>Thanks again,</div><div>Kevin Zhao</div><div><br><div class="gmail_quote">2010/10/25 Wolfgang Laun <span dir="ltr">&lt;<a href="mailto:wolfgang.laun@gmail.com">wolfgang.laun@gmail.com</a>&gt;</span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
I assume you are using Fusion, using a session clock so that temporal operators are available.<br><br>rule &quot;three A&quot;<br>when<br>&nbsp; $a1: EventA( $index : index )<br>&nbsp; $a2: EventA( index == $index )<br>&nbsp; $a3: EventA( index == $index )<br>

&nbsp; not EventB( this after[0ms] $a1 &amp;&amp; before[0ms] $a3, index == $index )<br>
then<br>&nbsp; // ... match<br>&nbsp; retract( $a1 );<br>&nbsp; retract( $a2 );<br>&nbsp; retract( $a3 );<br>end<br><br>-W<br><br><div class="gmail_quote">2010/10/25 ΥΤΩ©Ω© <span dir="ltr">&lt;<a href="mailto:kevin223@gmail.com" target="_blank">kevin223@gmail.com</a>&gt;</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><div></div><div class="h5">Hello,<div><br></div><div>I&#39;m still quite new to the drools stuffs just getting the examples running. I&#39;m sorry if my question is too basic.</div>


<div>I have a system that will continuously to receive events sent from some other system. Basically I have&nbsp;two types of events, eventA and eventB.&nbsp;</div>
<div>Both eventA and eventB have two properties, index and timestamp.</div><div><br></div><div>What I want is to capture a pattern to meet the following conditions</div><div><br></div><div>1. every 3 consecutive eventsA without any eventB in between&nbsp;having a same index value&nbsp;ordering by their timestamp.&nbsp;</div>



<div><br></div><div>2. all events in a matched pattern will have the same value of property index.</div><div><br></div><div>3. if a pattern is matched, any of the events in this pattern should not be used again for a new matching.</div>



<div><br></div><div>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.</div><div><br></div><div>eventB:2 &nbsp; &nbsp;eventA:1 &nbsp; &nbsp; eventA:1 &nbsp; &nbsp; eventA:1 &nbsp;eventB:3 &nbsp; &nbsp; &nbsp;--------- one successful match, we have three eventA with same index value 1 in a row</div>



<div><br></div><div>eventB:2 &nbsp; &nbsp;eventA:1 &nbsp; &nbsp; eventA:1 &nbsp; &nbsp; eventB:1 &nbsp;eventA:1 &nbsp; &nbsp; &nbsp;--------- no match because there&#39;s an eventB in between</div><div><br></div><div>eventB:2 &nbsp; &nbsp;eventA:1 &nbsp; &nbsp; eventA:1 &nbsp; &nbsp; eventB:2 &nbsp;eventA:1 &nbsp; &nbsp; &nbsp;--------- one successful match because the in-between eventB has a different index value</div>



<div><br></div><div>eventA:1 &nbsp; &nbsp;eventA:1 &nbsp; &nbsp; eventA:1 &nbsp; &nbsp; eventA:1 &nbsp;eventA:1 &nbsp; &nbsp; &nbsp;--------- only one match, because once matched, the events can not be used for a second match again.</div><div><br></div><div><br></div><div>



I just don&#39;t know how to write a rule like this. Is there anyone who can shed some lights on?</div><div><br></div><div>Best Regards,</div><div>Kevin</div><div><br></div><div><br></div>
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