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Hareendra Pelige wrote:
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cite="mid:251EE64CA47A7841ADBD015DF51C3A7A07B3942E@cs-mailsvr03.Virtusa.com"
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<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">Hi
All,<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">I
am new to this Drools rule engine. After looking at its features, I am
really
interested on this. I tried few samples given in jboss site and got to
know
high-level understanding of the rule engine and how it can be used in
our
business applications.<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">But,
I am really confused with the rule syntaxes used in sample files,
samples
published in the internet.<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"><o:p> </o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">Few
such syntaxes are listed bellow. Could you please let me know which is
better
for enterprise applications?<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"><o:p> </o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">1.
<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">rule
"Hello World"<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
dialect "mvel"<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"> when<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"> m
: Message( status == Message.HELLO, message : message<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">)<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"> then<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
System.out.println( message ); <o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
modify ( m ) { message = "Goodbyte cruel world",<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
status = Message.GOODBYE };<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
System.out.println( message ); <o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">end<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"><o:p> </o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">rule
"Good Bye"<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
dialect "java"<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"> when<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"> Message(
status == Message.GOODBYE, message : message )<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"> then<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"> System.out.println(
message ); <o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">End<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"><o:p> </o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">Questions:<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">Here,
what is "dialect" and what are 'mvel' and 'java'?<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">What
are the differences between 'mvel' and 'java'<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"><o:p> </o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">2.<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"><rule-set
name="disposition rules"<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
xmlns=<a class="moz-txt-link-rfc2396E" href="http://drools.org/rules">"http://drools.org/rules"</a> <o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
xmlns:java=<a class="moz-txt-link-rfc2396E" href="http://drools.org/semantics/java">"http://drools.org/semantics/java"</a><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
xmlns:xs=<a class="moz-txt-link-rfc2396E" href="http://www.w3.org/2001/XMLSchema-instance">"http://www.w3.org/2001/XMLSchema-instance"</a><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
xs:schemaLocation="<a class="moz-txt-link-freetext" href="http://drools.org/rules">http://drools.org/rules</a> rules.xsd<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
<a class="moz-txt-link-freetext" href="http://drools.org/semantics/java">http://drools.org/semantics/java</a>
java.xsd"><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"> <!--
season sale means 10% off item price --><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
<rule name="season sales"><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
<parameter identifier="item"><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
<class>de.linsin.example.drools.domain.Item</class><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
</parameter><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
<parameter identifier="bill"><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
<class>de.linsin.example.drools.domain.Bill</class><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
</parameter><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
<parameter identifier="quantity"><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
<class>java.lang.Integer</class><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
</parameter><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
<java:condition><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
item.isOnSeasonSale() == true<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
</java:condition><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
<java:consequence><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
double price = (item.getPrice()*(100-10))/100;<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
bill.addItem(item, quantity.intValue()*price);<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
</java:consequence><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
</rule><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
<!-- customer discount means 5% off total --><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
<rule name="discount"><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
<parameter identifier="bill"><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
<class>de.linsin.example.drools.domain.Bill</class><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
</parameter><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
<parameter identifier="customer"><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
<class>de.linsin.example.drools.domain.Customer</class><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
</parameter><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
<java:condition><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
customer.isDiscount() == true<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
</java:condition><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
<java:consequence><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
double total = bill.getTotal();<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
bill.setTotal((total*(100-5))/100);<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
</java:consequence><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">
</rule><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"></rule-set></span></font></p>
</div>
</blockquote>
that is drools2.0 - there is no relation between this and 4.0.<br>
<blockquote
cite="mid:251EE64CA47A7841ADBD015DF51C3A7A07B3942E@cs-mailsvr03.Virtusa.com"
type="cite">
<div class="Section1">
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"><o:p> </o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">3.
<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">package
com.test<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"><o:p> </o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">import
com.test.common.*;<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">import
java.util.ArrayList;<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"><o:p> </o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">//
Extract TestData<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">rule
"Extract Test Data"<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"> dialect
"java"<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"> when<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"> $productRequest
: ProductRequest(bookingRequest!=null) <o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"> then<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"> insert(
$productRequest.getDivision() );<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"><o:p> </o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"> System.out.println(
"Extracted Test Data."); end<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"><o:p> </o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"><o:p> </o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"><o:p> </o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">Could
you please point me a location(s) to learn drl rule language with its
syntaxes?<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"><o:p> </o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">Appreciate
any of your help.<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"><o:p> </o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">Thanks
and regards<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">Hareendra
Pelige<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"> <o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"><o:p> </o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">-----Original
Message-----<br>
From: <a class="moz-txt-link-abbreviated" href="mailto:rules-users-bounces@lists.jboss.org">rules-users-bounces@lists.jboss.org</a>
[<a class="moz-txt-link-freetext" href="mailto:rules-users-bounces@lists.jboss.org">mailto:rules-users-bounces@lists.jboss.org</a>] On Behalf Of Benjamin J
McMillan<br>
Sent: Thursday, May 29, 2008 3:15 AM<br>
To: Rules Users List<br>
Subject: [rules-users] the BRMS and queries</span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"><o:p> </o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">All,<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"><o:p> </o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">Either
the BRMS, when uploading a DRL file, doesn't read in queries, or<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">it
doesn't build them into the deployment package.<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"><o:p> </o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">Is
this by design, or a bug? For now my application (my unit tests,<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">actually)
queries the working memory for decision objects, instead of<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">having
rules respond to the decisions and put them into a data structure<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">the
java app can see. I could do the latter, but I'm just wondering if<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">maybe
I'm doing something wrong regarding queries and the BRMS.<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"><o:p> </o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">Thanks!<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"><o:p> </o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">Ben<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"><o:p> </o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"><o:p> </o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"><o:p> </o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">_______________________________________________<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;">rules-users
mailing list<o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
style="font-size: 10pt;"><a class="moz-txt-link-abbreviated" href="mailto:rules-users@lists.jboss.org">rules-users@lists.jboss.org</a><o:p></o:p></span></font></p>
<p class="MsoPlainText"><font face="Tahoma" size="2"><span
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