Re: [rules-users] result of one rule to another rule
by Greg Barton
Yes. When you modify an existing working memory object or insert a new one the resulting objects can be matched by another rule. This in effect "passes" the data to the next rule, but it's not direct like a procedure call.
GreG
On Jun 17, 2010, at 11:03 PM, surabhi soni <surabhi.soni.4(a)gmail.com> wrote:
hiiii
can we pass result of one rule to another rule as input
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14 years, 5 months
Loading .brl files
by Fnu Mahalakshmi
Hi,
Does anyone have any idea as to how we can load .brl files which have been created using a dsl into the rulebase?
How do we convert them to a format understood by the rulebase?
Please help.
Thank you
M
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14 years, 5 months
Knowledge Builder error
by Fnu Mahalakshmi
Hi,
I am using the following code for adding DSLs to my knowledge base and I keep getting following error
My code :
private KnowledgeBase loadRules(String[] rules) throws Exception{
KnowledgeBuilder builder = KnowledgeBuilderFactory.newKnowledgeBuilder();
builder.add(ResourceFactory.newClassPathResource("/sample-dsl.dsl"),ResourceType.DSL);
builder.add(ResourceFactory.newClassPathResource("/Rule1.dslr"), ResourceType.DSLR);
if (builder.hasErrors()) {
throw new RuntimeException(builder.getErrors().toString());
}
KnowledgeBase knowledgeBase = KnowledgeBaseFactory.newKnowledgeBase();
knowledgeBase.addKnowledgePackages(builder.getKnowledgePackages());
return knowledgeBase;
}
Error Stack:
Exception in thread "main" java.lang.NoSuchMethodError: org.drools.compiler.PackageBuilder.addKnowledgeResource(Lorg/drools/io/Resource;Lorg/drools/builder/ResourceType;Lorg/drools/builder/ResourceConfiguration;)V
at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:30)
at com.org.RuleRunner.loadRules(RuleRunner.java:51)
at com.org.RuleRunner.runStatelessRules(RuleRunner.java:127)
at com.org.RulesTest.main(RulesTest.java:41)
I have added all the required .jars for processing knowledge builder.
I have the drools-compiler.jar5.0.1 added to my classpath ( I downloaded it online)
Could you point me towards where I could download the correct drools-compiler and drools-core.jar files from?? Seems like the ones I have added to my classpath are not in harmony with each other.
Thank you. Please help.
M
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14 years, 5 months
Potential Job Opening for Core Drools Developer around Guvnor
by Mark Proctor
We are just finalising the details, but it looks like we may have a job
opening for a mid to senior java developer, to work with the Drools team
around Guvnor. I'm particulary interested in a London based developer,
who can work directly with me.
I'll post more details and a reference to the online details once they
become available. In the mean time, if you think you have what it takes,
send me an email.
Mark
14 years, 5 months
Working with DSL
by Fnu Mahalakshmi
Hi,
I am creating a DSL for my rules.
All my rules are business guided rules.
When using these business rules and loading them into the rule base : I need to convert them into .dslr rules.
I do know how to go about converting a .brl to a .drl file.
Can anyone give me a hint how to go about conversion of .brl to a .dslr file?
Thank you.
M
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14 years, 5 months
dsl error- please help
by Fnu Mahalakshmi
Hi guys,
I am trying to create a very basic dsl which is giving me the following error stack:
The code to add the dsl is as follows:
InputStream ruleSource = RuleRunner.class.getClassLoader().getResourceAsStream("/Rule1.dslr");
InputStream dslSource = RuleRunner.class.getClassLoader().getResourceAsStream("/sample-dsl.dsl");
//Load the rules , using DSL
addRulesToThisPackage.addPackageFromDrl(
new InputStreamReader(ruleSource),
new InputStreamReader(dslSource));
I have both the sample-dsl .dsl and Rule1.dslr in my working directory.
Error encountered at adding the dsl to the package (last line)
Error stack:
Exception in thread "main" java.lang.NullPointerException
at java.io.Reader.<init>(Unknown Source)
at java.io.InputStreamReader.<init>(Unknown Source)
at com.org.RuleRunner.loadRuleFile(RuleRunner.java:96)
at com.org.RuleRunner.loadRules(RuleRunner.java:48)
at com.org.RuleRunner.runStatelessRules(RuleRunner.java:109)
at com.org.RulesTest.main(RulesTest.java:41)
my dsl file has basic mapping as per the online documentations.
The dsl rule I created is:
expander sample-dsl.dsl
rule "A status changes B status"
when
There is an A
- has an address
There is a B
- has name
then
- print updated A and Aaddress
End
I have created DSL in eclipse.
Is the code I added for it to be loaded to my package correct?? Or am I missing something????
Please help.
Thanks.
M
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14 years, 5 months
smooks terrible error
by Fnu Mahalakshmi
Hi,
I am trying to work with smooks and have major errors !!! everything is crashing!
My code which I added is:
public void runStatelessRules(String[] rulesFiles,String dslFileName,Collection<Object>al,
String ruleFlowFileName) throws Exception {
KnowledgeBase ruleBase = loadRules(rulesFiles);
StatelessKnowledgeSession workingMemory = ruleBase.newStatelessKnowledgeSession();
Smooks smooks = new Smooks("smooks-config.xml");
DroolsSmooksConfiguration conf = new DroolsSmooksConfiguration("some name",null);
DroolsSmooksStatelessSession smooksSession = new
DroolsSmooksStatelessSession(session,smooks, conf);
javax.xml.transform.Source xmlSource = new StreamSource(getClass().getResourceAsStream("NewFile.xml"));
smooksSession.executeFileter(xmlSource);
workingMemory.execute(al); // what to add to my working memory?????????????
}
This is the basic code which I just incorporated from the book.
I installed smooks plugin for eclipse.
But could not find smooks-config.xml file.
I am not usre of what else I need to incorporate.
Now everything else also seems to be showing error i.e all the code which was working perfectly.
Please help!!! Major disaster.
Thank you
M
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14 years, 5 months
specific rules
by Fnu Mahalakshmi
Hi,
Is it possible for us to enhance the way our rule works?
For example:
Using a business rule can I specify to the user: A can have option 1,2,3
And user can set it as A[a] value 'is equal to ' 1 // and you can get output accordingly.
For instance if we could specify a set of drop down options for the user to make rules operation more easier??
Is it possible. I am using a DSL for the normal rules. But not sure how I can specify these specific details before hand.
Can we use or populate global lists in business guided rules??? In the condition part of a rule?? I am able to access it in the action part.
Please help.
Thank you.
M
</pre>
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14 years, 5 months
Guvnor importing model error
by Mylene
Hi,
I get errors after I import my (JAXB-generated) model in Guvnor.
The original schemas are rather complicated, and thus the generated model
depends heavily on inheritance. Could that be the problem?
The message I get is: Unable to validate package configuration (eg, DSLs,
models) for [my_package]. Suggestion completions may not operate correctly
for graphical editors for this package.
I don't get any completions... (but I guess that is to be expected after
this error)
I'm using drools-5.0-guvnor-standalone, Java 1.6 and JAXB version 2.2.1
Can anyone point me in the right direction?
Thanks
--
Mylene
14 years, 5 months
Global Variables and Business rules
by Fnu Mahalakshmi
Hi,
How can I depict global lists in my business rules?
For instance:
rule "populate list for A with required status"
when
$a : A()
$list : ArrayList( size > 0 )
from collect( B( a.name == $a.name, status == "P" ) )
then
requiredList.addAll($list);
end
I want to depict my $list : ArrayList( size > 0 )
from collect( B( a.name == $a.name, status == "P" ) )
with help of business rules.
Any idea how???
Thank you
M
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14 years, 5 months
