<br> Your question is funny. First you ask if Drools is capable of managing complex rules and then you mention examples of extremely simple rules? :) <br><br> Drools is FOL complete and so can represent any well formed First Order Logic expression. Anyway, I will use this message to advertise some of the temporal reasoning features that we have on Drools 5 for the benefit of anyone interested.<br>
<br> There are several ways of authoring such rules, depending on how you model your problem domain. One possible way of doing them is:<br><br>#1: <br>rule "<font color="black" size="2" face="Arial"><span style="font-size: 11pt; line-height: 150%;">If
a customer login within 5 minutes from two different locations, mark the user invalid."<br>when<br> $l1 : CustomerLogin( )<br> $l2 : CustomerLogin( userId == l1.$id, location != $<a href="http://l1.id">l1.id</a>, timestamp after[0s, 5m] $l1.timestamp )<br>
then<br> // mark user as invalid <br>end<br><br>In the previous example I assumed both login objects would be in working memory, but you can easily query for the previous login in an external datasource, pulling the data from the previous login on-demand for the reasoning cycle.<br>
<br>#2:<br>rule "</span></font><font color="black" size="2" face="Arial"><span style="font-size: 11pt; line-height: 150%;">If
the customer location is not on a list of valid locations, mark the user
invalid"<br>when<br> $l : CustomerLogin( location not memberOf $validLocations )<br>then<br> // mark the user invalid<br>end<br></span></font><font color="black" size="2" face="Arial"><span style="font-size: 11pt; line-height: 150%;"> <br>
In the above rule, I assume the valid locations list is a global list, but you can as easily model locations as being facts on your working memory or a service end point that you can call to validate the location.<br><br>
#3:<br>rule </span></font><font color="black" size="2" face="Arial"><span style="font-size: 11pt; line-height: 150%;">“Customer login
from more than 5 locations in the last one month”<br>when<br> $customer : Customer( $id : id )<br> $locations : Set( size > 5 ) from accumulate(<br> CustomerLogin( customerId == $id, $loc : location ) over window:time( 30d ),<br>
collectSet( $loc ) )<br>then<br> // do something as the customer logged in from more than 5 locations in the last 30 days<br>end<br><br>In the previous rule I decided to use sliding windows, just to show how that feature can be used to simplify rules, but again, there are several ways of doing it.<br>
<br>I strongly recommend you read Drools manual. <br><br><a href="http://www.jboss.org/drools/documentation.html">http://www.jboss.org/drools/documentation.html</a><br><br>Cheers,<br>Edson<br><br><br></span></font><br><div class="gmail_quote">
2009/5/19 Bhushan Bhangale <span dir="ltr"><<a href="mailto:bhushan_bhangale@kaleconsultants.com">bhushan_bhangale@kaleconsultants.com</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;">
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<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">Hi,</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">I recently came across Drools. I gone through the
documentation and the examples provide are quite simple. I want to know if it
can be really applied to complex real world problems.</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">Take for example,</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p style="margin-right: 0in; margin-left: 0.25in; margin-bottom: 0.0001pt; line-height: 150%;"><font color="black" size="2" face="Arial"><span style="font-size: 11pt; line-height: 150%;">If
a customer login within 5 minutes from two different locations, mark the user invalid.</span></font></p>
<p style="margin: 0in 0in 0.0001pt; line-height: 150%;"><font color="black" size="2" face="Arial"><span style="font-size: 11pt; line-height: 150%;">How can I write the above rule in
drools? I have the data when the user last logged in and the data of current
login. You can say two objects.</span></font></p>
<p style="margin: 0in 0in 0.0001pt; line-height: 150%;"><font color="black" size="2" face="Arial"><span style="font-size: 11pt; line-height: 150%;"> </span></font></p>
<p style="margin: 0in 0in 0.0001pt; line-height: 150%;"><font color="black" size="2" face="Arial"><span style="font-size: 11pt; line-height: 150%;">May be my understanding is wrong but
looks like based on rule I have to pass all the required data. How can then at
real time new rules can be added?</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">For example,</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p style="margin-right: 0in; margin-left: 0.25in; margin-bottom: 0.0001pt; line-height: 150%;"><font color="black" size="2" face="Arial"><span style="font-size: 11pt; line-height: 150%;">If
the customer location is not on a list of valid locations, mark the user
invalid.</span></font></p>
<p style="margin: 0in 0in 0.0001pt; line-height: 150%;"><font color="black" size="2" face="Arial"><span style="font-size: 11pt; line-height: 150%;"> </span></font></p>
<p style="margin: 0in 0in 0.0001pt; line-height: 150%;"><font color="black" size="2" face="Arial"><span style="font-size: 11pt; line-height: 150%;">For the above rule I need to pass a
list of valid locations as well.</span></font></p>
<p style="margin: 0in 0in 0.0001pt; line-height: 150%;"><font color="black" size="2" face="Arial"><span style="font-size: 11pt; line-height: 150%;"> </span></font></p>
<p style="margin: 0in 0in 0.0001pt; line-height: 150%;"><font color="black" size="2" face="Arial"><span style="font-size: 11pt; line-height: 150%;">Now how about “Customer login
from more than 5 locations in the last one month”?</span></font></p>
<p style="margin: 0in 0in 0.0001pt; line-height: 150%;"><font color="black" size="2" face="Arial"><span style="font-size: 11pt; line-height: 150%;"> </span></font></p>
<p style="margin: 0in 0in 0.0001pt; line-height: 150%;"><font color="black" size="2" face="Arial"><span style="font-size: 11pt; line-height: 150%;">Thanks</span></font></p>
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<p><b><font color="#4e81c4" size="1" face="Verdana"><span style="font-size: 8pt; font-family: Verdana; color: rgb(78, 129, 196); font-weight: bold;">Mr.
Bhangale Bhushan</span></font></b><font color="#4e81c4" size="1" face="Verdana"><span style="font-size: 8pt; font-family: Verdana; color: rgb(78, 129, 196);"><br>
<i><span style="font-style: italic;">Associate Manager</span></i><br>
<b><b><font face="Verdana"><span style="font-family: Verdana;">Kale
Consultants Ltd.</span></font></b></b><br>
<a href="mailto:bhushan_bhangale@kaleconsultants.com" target="_blank"><font color="#4e81c4"><span style="color: rgb(78, 129, 196); text-decoration: none;">bhushan_bhangale@kaleconsultants.com</span></font></a><br>
tel: <a href="http://www.plaxo.com/click_to_call?lang=en&src=jj_signature&To=%2B91+%280%29206+608+3777&Email=bhushan_bhangale@kaleconsultants.com" title="Click to call. Cheap rates & no headset required!" target="_blank"><font color="#4e81c4"><span style="color: rgb(78, 129, 196); text-decoration: none;">+91 (0)206
608 3777</span></font></a><br>
<a href="http://www.kaleconsultants.com" target="_blank"><font color="#4e81c4"><span style="color: rgb(78, 129, 196); text-decoration: none;">http://www.kaleconsultants.com</span></font></a>
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<br></blockquote></div><br><br clear="all"><br>-- <br> Edson Tirelli<br> JBoss Drools Core Development<br> JBoss, a division of Red Hat @ <a href="http://www.jboss.com">www.jboss.com</a><br>