gmane.comp.java.drools.user

headers Edson Tirelli | 2 Dec 19:06

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I need to convert a variable from string to intger in the rule. That variable
here is rank, so, I create a helper class called 'Conversion' with just one
function/method, which is supposed to convert the string argument passed to
it, to an integer and then I call that method in rule as inline eval. What's
wrong here because this is not working and I don't want to change 'When'
part too much because it has 10 or so other variable with && connective,
which I've removed for clarity here. Any input would be appreciated much.

package harules;
import com.hibernate.Person;
import com.uhg.utils.Conversion;

rule "one"
salience 10
	when
	$con: Conversion();
	pers: Person(age!= null , age >= 18 , eval($con.getInteger(rank) > 140))
	then
	System.out.println("Evaluated true");
end

//content of Conversion class
package com.utils;
public class Conversion {
public Integer getInteger(String s)
{
	return Integer.parseInt(s);
}
}
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I have a number of questions as it relates the creation of rule flows:

1) I am assuming that when creating the constraints within a given node
within a rule flow that the selection of "rule"  as the type will create a
rule behind the scenes while selection of "code" will create some java
object representation? If this is a correct understanding is there any
preference from an engine perspective, are there performance or other
considerations that must be taken into account?

2) Is there any way to precompile rule flows like rule files are (as opposed
to at runtime with a call to packageBuilder.addRuleFlow(source))? With the
Drools builder any errors in the .drl files are highlighted. Not so with the
.rf. In order to see what is generated it appears that you have to step
through in debug mode at runtime and buried inside there is a string
representation of everything that was generated as well a list of errors
which refer to errors such as parse errors. Unfortunately this manifests
itself eventually (at least with my flow) as a NullPointerException giving
absolutely no indication as to the root of the problems, which I am assuming
are these parser errors. Seems to me that these errors should be returned
with a call to packageBuilder.hasErrors() which is empty in my case.
3) Code assist doesnt appear to work in action editor or constraint editor
which is I think is a pretty big usablity issue. Anything planned to make
this available?

Thanks
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> Hi,
>
> You can do both ways:
> 1)
> in DSL:
> There is a Message that=msg : Message(payload : payload)
> in DSLR:
> There is a Message that
> xpathEquals "/Root/aaaa" "bbb"
> xpathEquals "/Root/cccc" "dddd"
>
> 2)
> in DSL:
> xpathEquals "{path}" "{value}"=msg : Message(payload : payload) and eval
> (DOMUtil.xpathEquals(payload, "{path}", "{value}"))
> andXpathEquals "{path}" "{value}"=eval (DOMUtil.xpathEquals(payload,
> "{path}", "{value}"))
> in DSLR:
> xpathEquals "/Root/aaaa" "bbb"
> andXpathEquals "/Root/cccc" "dddd"

Ok, Thanks 

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Hello,

I've a question about drl and dsl with drools 4.0.

I've this rule :

rule "Contexte1"
	when
	   msg : Message(payload : payload)
	   eval (DOMUtil.xpathEquals(payload, "/Root/aaaa", "bbb"))
	   eval (DOMUtil.xpathEquals(payload, "/Root/cccc", "dddd"))
	then
           System.out.println ("Contexte 1 ************* : OK");
end

I use a dsl, to make it work, so now my drl is like that :

rule "Contexte1"
	when
		>msg : Message(payload : payload)
		xpathEquals "/Root/aaaa" "bbb"
		xpathEquals "/Root/cccc" "dddd"
	then
		Log : "Contexte 1 ************* : OK";
end

I was forced to make an ">" at the line "msg : Message(payload : payload)"
otherwise, he tells me that he can't expand that line.

There is a way to :
- avoid to put the ">" even if I have to add something else to the dsl ?
- avoid the line "msg : Message(payload : payload)" in my drl and simplify
my dsl so that xPathEquals "know" that the "payload" variable come from
any object Message in Working Memory ?

Thanks 

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Hi. I'm newbie to Drools.

I'm just wondering how I define the rules with my web application that has
several layers, web,business-logic,and data access.
one rule is used in the wab layer, and another one is used in the
business-logic layer.
Both rule's "when" are the same, but the "then"(action) is different.

It looks like code dupulication.
(I mean when the "when" changes, every rules that has same "when" has to be
changed, right?)

What's the recommended way in this situation?

thanks

Shige

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Re: ClassCastException when firing rules

german manual available?

Re :Action firing twice

Action firing twice

Inline eval problem!

Re: function problem

Precompilation of Rule Flows

Re: expand rules with dsl

expand rules with dsl

recommend way about same when , different then

Re: Oring conditions