[rules-users] To know about correct Drools rule file (drl) syntaxes
Hi All,
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.
But, I am really confused with the rule syntaxes used in sample files,
samples published in the internet.
Few such syntaxes are listed bellow. Could you please let me know which
is better for enterprise applications?
1.
rule Hello World
dialect mvel
when
m : Message( status == Message.HELLO, message :
message
)
then
System.out.println( message );
modify ( m ) { message = Goodbyte cruel world,
status = Message.GOODBYE };
System.out.println( message );
end
rule Good Bye
dialect java
when
Message( status == Message.GOODBYE, message :
message )
then
System.out.println( message );
End
Questions:
Here, what is dialect and what are 'mvel' and 'java'?
What are the differences between 'mvel' and 'java'
2.
rule-set name=disposition rules
xmlns=http://drools.org/rules;
xmlns:java=http://drools.org/semantics/java;
xmlns:xs=http://www.w3.org/2001/XMLSchema-instance;
xs:schemaLocation=http://drools.org/rules rules.xsd
http://drools.org/semantics/java java.xsd
!-- season sale means 10% off item price --
rule name=season sales
parameter identifier=item
classde.linsin.example.drools.domain.Item/class
/parameter
parameter identifier=bill
classde.linsin.example.drools.domain.Bill/class
/parameter
parameter identifier=quantity
classjava.lang.Integer/class
/parameter
java:condition
item.isOnSeasonSale() == true
/java:condition
java:consequence
double price = (item.getPrice()*(100-10))/100;
bill.addItem(item, quantity.intValue()*price);
/java:consequence
/rule
!-- customer discount means 5% off total --
rule name=discount
parameter identifier=bill
classde.linsin.example.drools.domain.Bill/class
/parameter
parameter identifier=customer
classde.linsin.example.drools.domain.Customer/class
/parameter
java:condition
customer.isDiscount() == true
/java:condition
java:consequence
double total = bill.getTotal();
bill.setTotal((total*(100-5))/100);
/java:consequence
/rule
/rule-set
3.
package com.test
import com.test.common.*;
import java.util.ArrayList;
// Extract TestData
rule Extract Test Data
dialect java
when
$productRequest :
ProductRequest(bookingRequest!=null)
then
insert( $productRequest.getDivision() );
System.out.println( Extracted Test Data.); end
Could you please point me a location(s) to learn drl rule language with
its syntaxes?
Appreciate any of your help.
Thanks and regards
Hareendra Pelige
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Benjamin J
McMillan
Sent: Thursday, May 29, 2008 3:15 AM
To: Rules Users List
Subject: [rules-users] the BRMS and queries
All,
Either the BRMS, when uploading a DRL file, doesn't read in queries, or
it doesn't build them into the deployment package.
Is this by design, or a bug? For now my application (my unit tests,
actually) queries the working memory for decision objects, instead of
having rules respond to the decisions and put them into a data structure
the java app can see. I could do the latter, but I'm just wondering if
maybe I'm doing something wrong regarding queries and the BRMS.
Thanks!
Ben
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[rules-users] Re: Ant script for creating pkg files
Hi,
You can use below ant script to build .pkg files
project default=rules name=RuleProject
!-- Uncomment this for Maven Runner --
property name=eclipsepath value=./
!-- Uncomment this for Eclipse Runner --
!-- property name=eclipsepath value=../../..// --
path id=cheese.classpath
pathelement location=${eclipsepath}/build/Beans.jar/
/path
target name=beans
tstamp/
echo message=CREATING Beans JAR.../
jar
jarfile=./build/Beans.jar
fileset
dir=./bin/
/jar
/target
path
pathelement/pathelement
/path
path id=drools.classpath
fileset dir=${eclipsepath}/build/lib/
include name=*.jar/
/fileset
pathelement location=target/
/path
taskdef name=compiler
classname=org.drools.contrib.DroolsCompilerAntTask
classpathref=drools.classpath /
target name=rules
compiler
srcdir=${eclipsepath}/src/main/rules
tofile=${eclipsepath}/target/cheese.pkg
classpathref=cheese.classpath
binformat=package
include name=*.drl /
!-- include name=*.brl /
include name=*.xml /
include name=*.dslr / --
/compiler
/target
/project
reference http://www.nabble.com/Ant-compiler-task--td15906277.html#a15907448
Regards,
Ravi T
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[rules-users] Re: To know about correct Drools rule file (drl) syntaxes
Hi. Check: drools.pdf http://downloads.jboss.com/drools/docs/4.0.3.15993.GA/html_single/index.html http://legacy.drools.codehaus.org/Tutorials+and+Examples -P ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] Using global in LHS
Hi, again a question, any body had success using globals in LHS? Following DSL [condition][]is a Item=Item() [condition][]-is of type Advertisment=advertisment contains catId rule when $pli: is a Item - is of type Advertisment then // do whatever you want end catId is a member of Item advertisment is a Integer[] array set as global comiling ends with: Unable to create Field Extractor for 'advertisment' of '[ClassObjectType It works fine if advertisment is a member of Item, but i want to have it as global ... Cheers Markus ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] To know about correct Drools rule file (drl) syntaxes
Hareendra Pelige wrote:
Hi All,
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.
But, I am really confused with the rule syntaxes used in sample files,
samples published in the internet.
Few such syntaxes are listed bellow. Could you please let me know
which is better for enterprise applications?
1.
rule Hello World
dialect mvel
when
m : Message( status == Message.HELLO, message
: message
)
then
System.out.println( message );
modify ( m ) { message = Goodbyte cruel world,
status = Message.GOODBYE };
System.out.println( message );
end
rule Good Bye
dialect java
when
Message( status == Message.GOODBYE, message :
message )
then
System.out.println( message );
End
Questions:
Here, what is dialect and what are 'mvel' and 'java'?
What are the differences between 'mvel' and 'java'
2.
rule-set name=disposition rules
xmlns=http://drools.org/rules;
xmlns:java=http://drools.org/semantics/java;
xmlns:xs=http://www.w3.org/2001/XMLSchema-instance;
xs:schemaLocation=http://drools.org/rules rules.xsd
http://drools.org/semantics/java java.xsd
!-- season sale means 10% off item price --
rule name=season sales
parameter identifier=item
classde.linsin.example.drools.domain.Item/class
/parameter
parameter identifier=bill
classde.linsin.example.drools.domain.Bill/class
/parameter
parameter identifier=quantity
classjava.lang.Integer/class
/parameter
java:condition
item.isOnSeasonSale() == true
/java:condition
java:consequence
double price = (item.getPrice()*(100-10))/100;
bill.addItem(item, quantity.intValue()*price);
/java:consequence
/rule
!-- customer discount means 5% off total --
rule name=discount
parameter identifier=bill
classde.linsin.example.drools.domain.Bill/class
/parameter
parameter identifier=customer
classde.linsin.example.drools.domain.Customer/class
/parameter
java:condition
customer.isDiscount() == true
/java:condition
java:consequence
double total = bill.getTotal();
bill.setTotal((total*(100-5))/100);
/java:consequence
/rule
/rule-set
that is drools2.0 - there is no relation between this and 4.0.
3.
package com.test
import com.test.common.*;
import java.util.ArrayList;
// Extract TestData
rule Extract Test Data
dialect java
when
$productRequest :
ProductRequest(bookingRequest!=null)
then
insert( $productRequest.getDivision() );
System.out.println( Extracted Test Data.); end
Could you please point me a location(s) to learn drl rule language
with its syntaxes?
Appreciate any of your help.
Thanks and regards
Hareendra Pelige
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Benjamin J
McMillan
Sent: Thursday, May 29, 2008 3:15 AM
To: Rules Users List
Subject: [rules-users] the BRMS and queries
All,
Either the BRMS, when uploading a DRL file, doesn't read in queries, or
it doesn't build them into the deployment package.
Is this by design, or a bug? For now my application (my unit tests,
actually) queries the working memory for decision objects, instead of
having rules respond to the decisions and put them into a data structure
the java app can see. I could do the latter, but I'm just wondering if
maybe I'm doing something wrong regarding queries and the BRMS.
Thanks!
Ben
___
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https://lists.jboss.org/mailman/listinfo/rules-users
This message, including any attachments, contains confidential
information intended for a specific individual and purpose, and is
intended for the addressee only. Any unauthorized disclosure, use,
dissemination, copying, or distribution of this message or any of its
attachments or the information contained in this e-mail, or the taking
of any action based on it, is strictly prohibited. If you are not the
RE: [rules-users] Old drools-spring project
If it helps, I am running Spring 2.5 with drools 4 and not having issues. _ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Lake Pancake Sent: Thursday, May 29, 2008 9:33 AM To: rules-users@lists.jboss.org Subject: [rules-users] Old drools-spring project I found this: http://docs.codehaus.org/display/DROOLS/Drools+Spring+Tutorial http://docs.codehaus.org/display/DROOLS/Drools+Spring+Tutorial The latest version available for drools-spring appears to be 2.5-beta-1. Is it stable and does it work with Drools 4 or should I stay away? Thanks ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Old drools-spring project
Lake Pancake wrote: I found this: http://docs.codehaus.org/display/DROOLS/Drools+Spring+Tutorial The latest version available for drools-spring appears to be 2.5-beta-1. Is it stable and does it work with Drools 4 or should I stay away? It does not work with drools 2.5. Paul Browne is working on spring integration with 4.0, but its slow progress due to not enough community involvement. Thanks ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
RE: [rules-users] Old drools-spring project
Really. What kinds of issues are you seeing for Spring? I am using decision tables and, as I stated earlier, it's working very well. _ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mark Proctor Sent: Thursday, May 29, 2008 10:03 AM To: Rules Users List Subject: Re: [rules-users] Old drools-spring project Lake Pancake wrote: I found this: http://docs.codehaus.org/display/DROOLS/Drools+Spring+Tutorial http://docs.codehaus.org/display/DROOLS/Drools+Spring+Tutorial The latest version available for drools-spring appears to be 2.5-beta-1. Is it stable and does it work with Drools 4 or should I stay away? It does not work with drools 2.5. Paul Browne is working on spring integration with 4.0, but its slow progress due to not enough community involvement. Thanks _ ___ rules-users mailing list rules-users@lists.jboss.org mailto:rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users https://lists.jboss.org/mailman/listinfo/rules-users ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Re: To know about correct Drools rule file (drl)syntaxes
Hareendra Pelige wrote: Thanks for the feedback. According to your experience, which rule file language is commonly used? drl, rtfm, its well explaine and the examples are well documented as walk through tutorials. http://www.jboss.org/drools/documentation.html Thanks Hareendra Pelige *From:* [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] *On Behalf Of *pramod george *Sent:* Thursday, May 29, 2008 1:54 PM *To:* rules-users@lists.jboss.org *Subject:* [rules-users] Re: To know about correct Drools rule file (drl)syntaxes Hi. Check: drools.pdf http://downloads.jboss.com/drools/docs/4.0.3.15993.GA/html_single/index.html http://legacy.drools.codehaus.org/Tutorials+and+Examples -P Amity This message, including any attachments, contains confidential information intended for a specific individual and purpose, and is intended for the addressee only. Any unauthorized disclosure, use, dissemination, copying, or distribution of this message or any of its attachments or the information contained in this e-mail, or the taking of any action based on it, is strictly prohibited. If you are not the intended recipient, please notify the sender immediately by return e-mail and delete this message. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
RE: [rules-users] Re: To know about correct Drools rule file (drl)syntaxes
On Thu, May 29, 2008 16:17, Hareendra Pelige wrote:
According to your experience, which rule file language is commonly used?
I would say that this syntax from your email is easiest to use. As Mark
explained, the xml-type language is old, version 2.0. You can define a
domain specific language, but that's worth the effort only in larger
projects, I'd say.
Christine
rule Hello World
when
m : Message( status == Message.HELLO, message : message)
then
System.out.println( message );
modify ( m ) { message = Goodbyte cruel world,
status = Message.GOODBYE };
System.out.println( message );
end
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