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<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>Hi
All,<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>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 size=2 face=Tahoma><span style='font-size:10.0pt'>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 size=2 face=Tahoma><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>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 size=2 face=Tahoma><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>1.
<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>rule
"Hello World"<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
dialect "mvel"<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'> when<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'> m
: Message( status == Message.HELLO, message : message<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>)<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'> then<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
System.out.println( message ); <o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
modify ( m ) { message = "Goodbyte cruel world",<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
status = Message.GOODBYE };<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
System.out.println( message ); <o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>end<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>rule
"Good Bye"<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
dialect "java"<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'> when<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'> Message(
status == Message.GOODBYE, message : message )<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'> then<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'> System.out.println(
message ); <o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>End<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>Questions:<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>Here,
what is "dialect" and what are 'mvel' and 'java'?<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>What
are the differences between 'mvel' and 'java'<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>2.<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'><rule-set
name="disposition rules"<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
xmlns="http://drools.org/rules" <o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
xmlns:java="http://drools.org/semantics/java"<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
xmlns:xs="http://www.w3.org/2001/XMLSchema-instance"<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
xs:schemaLocation="http://drools.org/rules rules.xsd<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
http://drools.org/semantics/java
java.xsd"><o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'> <!--
season sale means 10% off item price --><o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
<rule name="season sales"><o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
<parameter identifier="item"><o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
<class>de.linsin.example.drools.domain.Item</class><o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
</parameter><o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
<parameter identifier="bill"><o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
<class>de.linsin.example.drools.domain.Bill</class><o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
</parameter><o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
<parameter identifier="quantity"><o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
<class>java.lang.Integer</class><o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
</parameter><o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
<java:condition><o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
item.isOnSeasonSale() == true<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
</java:condition><o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
<java:consequence><o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
double price = (item.getPrice()*(100-10))/100;<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
bill.addItem(item, quantity.intValue()*price);<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
</java:consequence><o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
</rule><o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
<!-- customer discount means 5% off total --><o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
<rule name="discount"><o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
<parameter identifier="bill"><o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
<class>de.linsin.example.drools.domain.Bill</class><o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
</parameter><o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
<parameter identifier="customer"><o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
<class>de.linsin.example.drools.domain.Customer</class><o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
</parameter><o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
<java:condition><o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
customer.isDiscount() == true<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
</java:condition><o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
<java:consequence><o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
double total = bill.getTotal();<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
bill.setTotal((total*(100-5))/100);<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
</java:consequence><o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>
</rule><o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'></rule-set><o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>3.
<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>package
com.test<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>import
com.test.common.*;<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>import
java.util.ArrayList;<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>//
Extract TestData<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>rule
"Extract Test Data"<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'> dialect
"java"<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'> when<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'> $productRequest
: ProductRequest(bookingRequest!=null) <o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'> then<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'> insert(
$productRequest.getDivision() );<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'> System.out.println(
"Extracted Test Data."); end<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>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 size=2 face=Tahoma><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>Appreciate
any of your help.<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>Thanks
and regards<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>Hareendra
Pelige<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'> <o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>-----Original
Message-----<br>
From: rules-users-bounces@lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] 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 size=2 face=Tahoma><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>All,<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>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 size=2 face=Tahoma><span style='font-size:10.0pt'>it
doesn't build them into the deployment package.<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>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 size=2 face=Tahoma><span style='font-size:10.0pt'>actually)
queries the working memory for decision objects, instead of<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>having
rules respond to the decisions and put them into a data structure<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>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 size=2 face=Tahoma><span style='font-size:10.0pt'>maybe
I'm doing something wrong regarding queries and the BRMS.<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>Thanks!<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>Ben<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>_______________________________________________<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>rules-users
mailing list<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>rules-users@lists.jboss.org<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Tahoma><span style='font-size:10.0pt'>https://lists.jboss.org/mailman/listinfo/rules-users<o:p></o:p></span></font></p>
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