3:47 p.m.
Thanks for ur suggestion! I just wanted to keep the business logic in
separate drools layer.
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3:49 p.m.
New subject: Drools all lhs execute before all the rhs, i want to run sequentially
@Nguy I tried salience but it just orders the execution of "when" part, but
still all when execute before the "then" parts
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4:48 p.m.
New subject: Drools all lhs execute before all the rhs, i want to run sequentially
You missed the second part of the instructions - once a rule has matched you need to make
sure the other rules don't match.
This can be achieved in multiple ways:
Call the engines halt method - just stop evaluation.
Retract the facts - then nothing else can match it.
Update the facts to stop the condition from being matched - eg add a "processed"
field and make the rules match only if processed is false.
Insert a new fact and modify your rules to only run if that fact doesn't exist - eg
add "not YourResultObject()" to the when's and "insert(new
YourResultObject());" to the thens.
Thomas
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-
bounces(a)lists.jboss.org] On Behalf Of Saurabh Pandey
Sent: 26 September 2011 07:49
To: rules-users(a)lists.jboss.org
Subject: Re: [rules-users] Drools all lhs execute before all the rhs, i want to
run sequentially
@Nguy I tried salience but it just orders the execution of "when" part, but
still all when execute before the "then" parts
--
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lhs-execute-before-all-the-rhs-i-want-to-run-sequentially-
tp3368215p3368415.html
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7:22 p.m.
New subject: Drools all lhs execute before all the rhs, i want to run sequentially
these are my rules:
rule "Rule 03"
salience 10
when
$info : RuleRunner()
eval(RuleRunner.check())
eval(RuleRunner.setIt())
then
System.out.println("********3**********");
$info.printResult(1);
end
rule "Rule 04"
salience 8
when
$info : RuleRunner()
eval(RuleRunner.check())
then
System.out.println("********4**********");
$info.printResult(2);
end
these are my java methods:
static boolean cvar = true;
public void printResult(int i){
System.out.println(i);
}
public static boolean check(){
System.out.println("********check**********");
return cvar;
}
public static boolean setIt(){
cvar = false;
return true;
}
this is how i am invoking the rules:
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add(ResourceFactory.newFileResource("rule03.drl"),
ResourceType.DRL );
if ( kbuilder.hasErrors() ) {
System.err.println( kbuilder.getErrors().toString() );
}
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() );
StatelessKnowledgeSession ksession =
kbase.newStatelessKnowledgeSession();
ksession.execute(new RuleRunner());
This is the output:
********check**********
********3**********
1
********4**********
2
Why is check printing only once though its called 2 times in 2 rules, and
when cvar is false then also 2nd rule's then part is executing?
Is it that static methods of same name are called once and there result is
stored and used in all rules??
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7:39 p.m.
New subject: Drools all lhs execute before all the rhs, i want to run sequentially
Have you read the expert guide?
http://docs.jboss.org/drools/release/5.2.0.Final/drools-expert-docs/html_...
- At least up to the end of chapter 4.
Why are you using static fields and methods?
You are changing the value of objects in the when condition which is really really really
bad and it's no wonder nothing is working like you are expecting.
The fact that you are using eval's is a good indication that your code is written
wrong, for simple rules you never need to use it.
Thomas
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-
bounces(a)lists.jboss.org] On Behalf Of Saurabh Pandey
Sent: 26 September 2011 11:22
To: rules-users(a)lists.jboss.org
Subject: Re: [rules-users] Drools all lhs execute before all the rhs, i want to
run sequentially
these are my rules:
rule "Rule 03"
salience 10
when
$info : RuleRunner()
eval(RuleRunner.check())
eval(RuleRunner.setIt())
then
System.out.println("********3**********");
$info.printResult(1);
end
rule "Rule 04"
salience 8
when
$info : RuleRunner()
eval(RuleRunner.check())
then
System.out.println("********4**********");
$info.printResult(2);
end
these are my java methods:
static boolean cvar = true;
public void printResult(int i){
System.out.println(i);
}
public static boolean check(){
System.out.println("********check**********");
return cvar;
}
public static boolean setIt(){
cvar = false;
return true;
}
this is how i am invoking the rules:
KnowledgeBuilder kbuilder =
KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add(ResourceFactory.newFileResource("rule03.drl"),
ResourceType.DRL );
if ( kbuilder.hasErrors() ) {
System.err.println( kbuilder.getErrors().toString() );
}
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() );
StatelessKnowledgeSession ksession =
kbase.newStatelessKnowledgeSession();
ksession.execute(new RuleRunner());
This is the output:
********check**********
********3**********
1
********4**********
2
Why is check printing only once though its called 2 times in 2 rules, and when
cvar is false then also 2nd rule's then part is executing?
Is it that static methods of same name are called once and there result is
stored and used in all rules??
--
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lhs-execute-before-all-the-rhs-i-want-to-run-sequentially-
tp3368215p3368864.html
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7:51 p.m.
New subject: Drools all lhs execute before all the rhs, i want to run sequentially
@thomas thanks for your comments I am new to drools, can u plz give me an
alternative to the above code.
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7:53 p.m.
New subject: Drools all lhs execute before all the rhs, i want to run sequentially
As I said, try reading the expert doc, there's some examples in there which you can
base your code on.
Once you've done that or if you have any questions about the samples/what the
documentation means
then post them and we'd be pleased to help, but the first step is to structure your
code correctly using
objects that follow the bean conventions and rules structured correctly with conditions
against objects
and appropriate modify statements.
Thomas
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-
bounces(a)lists.jboss.org] On Behalf Of Saurabh Pandey
Sent: 26 September 2011 11:51
To: rules-users(a)lists.jboss.org
Subject: Re: [rules-users] Drools all lhs execute before all the rhs, i want to
run sequentially
@thomas thanks for your comments I am new to drools, can u plz give me an
alternative to the above code.
--
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lhs-execute-before-all-the-rhs-i-want-to-run-sequentially-
tp3368215p3368917.html
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**************************************************************************************
8:11 p.m.
New subject: Drools all lhs execute before all the rhs, i want to run sequentially
Hi,
If you have a lot of rules like it you might be able to use the jBPM (what what the
Drools Flow) to help with this. Otherwise plan old java might be easier...
Wendy
________________________________
From: "Swindells, Thomas" <TSwindells(a)nds.com>
To: Rules Users List <rules-users(a)lists.jboss.org>
Sent: Monday, September 26, 2011 6:53 AM
Subject: Re: [rules-users] Drools all lhs execute before all the rhs, i want to run
sequentially
As I said, try reading the expert doc, there's some examples in there which you can
base your code on.
Once you've done that or if you have any questions about the samples/what the
documentation means
then post them and we'd be pleased to help, but the first step is to structure your
code correctly using
objects that follow the bean conventions and rules structured correctly with conditions
against objects
and appropriate modify statements.
Thomas
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-
bounces(a)lists.jboss.org] On Behalf Of Saurabh Pandey
Sent: 26 September 2011 11:51
To: rules-users(a)lists.jboss.org
Subject: Re: [rules-users] Drools all lhs execute before all the rhs, i want to
run sequentially
@thomas thanks for your comments I am new to drools, can u plz give me an
alternative to the above code.
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lhs-execute-before-all-the-rhs-i-want-to-run-sequentially-
tp3368215p3368917.html
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7:53 p.m.
New subject: Drools all lhs execute before all the rhs, i want to run sequentially
Saurabh Pandey wrote:
@Nguy I tried salience but it just orders the execution of
"when" part,
but
still all when execute before the "then" parts
Hi,
it seems to me that you are using the wrong tool to solve your problem.
Drools is a rule-based execution engine (among other things) not a
glorified if-then-else-if executor.
I'd suggest you consult the Drools manual (site is off at the moment). At
the beggining there is a nice section about when you could benefit from a
Drools-like approach or not.
If you still think that Drools is best suited for your needs, you need to
rethink your approach. I would not suggest using salience as this could be
mistaked as a way to force procedural logic on a system(Drools) that is
inherently not so.
-Stathis
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4607
days inactive
4607
days old
8 comments
4 participants
participants (4)
-
rouvas＠mm.di.uoa.gr -
Saurabh Pandey -
Swindells, Thomas -
Wendy Mungovan