[rules-users] Smart Templates
ChrisMu
christopher.mullard at credit-suisse.com
Wed Jun 1 05:48:47 EDT 2011
I get this exception:
Exception in thread "main" org.drools.runtime.rule.ConsequenceException: rule: RFI1
at org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:927)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:856)
at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1071)
at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:785)
at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:751)
at org.drools.template.parser.TemplateDataListener.finishSheet(TemplateDataListener.java:121)
at org.drools.template.DataProviderCompiler.finishData(DataProviderCompiler.java:100)
at org.drools.template.DataProviderCompiler.processData(DataProviderCompiler.java:95)
at org.drools.template.DataProviderCompiler.compile(DataProviderCompiler.java:73)
at org.drools.template.ObjectDataCompiler.compile(ObjectDataCompiler.java:44)
at org.drools.examples.decisiontable.TemplateParser.<init>(TemplateParser.java:33)
at org.drools.examples.decisiontable.TemplateParser.main(TemplateParser.java:18)
Caused by: java.lang.RuntimeException: [Error: unable to resolve method: java.util.HashMap.value() [arglength=0]]
[Near : {... Unknown ....}]
^
[Line: 1, Column: 0]
at org.drools.template.parser.DefaultGenerator.generate(DefaultGenerator.java:73)
at org.drools.template.parser.Rule_RFI1_0.defaultConsequence(Rule_RFI1_0.java:7)
at org.drools.template.parser.Rule_RFI1_0DefaultConsequenceInvoker.evaluate(Rule_RFI1_0DefaultConsequenceInvoker.java:30)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:917)
... 11 more
Caused by: [Error: unable to resolve method: java.util.HashMap.value() [arglength=0]]
[Near : {... Unknown ....}]
^
[Line: 1, Column: 0]
at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:932)
at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getBeanProperty(ReflectiveAccessorOptimizer.java:592)
at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:311)
at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:137)
My rule template is virtually the same (name is a literal):
rule "DCe_@{row.rowNumber <mailto:DCe_@{row.rowNumber> }"
when
$service:ServiceBean(name == "DiscountCurve", value == "@{value}")
$riskType:RiskType()
then
$riskType.setName("@{type}");
$riskType.setValue("@{value}");
end template
________________________________
From: Wolfgang Laun-2 [via Drools] [mailto:ml-node+3009984-1046928327-404175 at n3.nabble.com]
Sent: 01 June 2011 10:33
To: Mullard, Christopher
Subject: Re: [rules-users] Smart Templates
There is a way, provided the required information is available at the time the rule is created.
There is a detailed section in the Expert manual explaining how to call template expansion with either a Collection of Map objects or a Collection of JavaBean objects. Taking beans, you would have
ServiceBean( String name, String value )
String getName
String getValue
String getType(){
  if( "AAA".equals( value ) ) return "Type1";
  if( "XYZ".equals( value ) ) return "Type2";
  ...
}
You create a collection of such Objects, and call the expander for a template like this:
rule "DC_@{row.rowNumber}"
when
  $service: Service(name == "@{service}", value == "@{value}")
  $riskType: RiskType()
then
  $riskType.setName("@{type}");
  $riskType.setAtt(0,"@{value}");
end
-W
2011/6/1 ChrisMu <[hidden email]>
So in essence, there's no way to use a function to insert a string literal into a rule from a template?
________________________________
From: FrankVhh [via Drools] [mailto:[hidden email] <http://user/SendEmail.jtp?type=node&node=3009838&i=0> ]
Sent: 31 May 2011 17:20
To: Mullard, Christopher
Subject: RE: Smart Templates
But then that would call the service.getType() method when the rule is
run wouldn't it?
-> Yes
Â
I'm trying create explicit, simple rules to avoid doing extra work when
running data through them.
-> OK, in essence, I like that :-)
Â
How would you use a rule to set the value within another rule?
-> I am not sure that I follow you here...
If you want to avoid to execute the getType()-service at rule execution, then you would need to add an attribute name to your object, and call getType() before creating the rules.
Alternatively, you can insert an intermediate value whose value will be set by another rule and then use this intermediate value in your DC rules.
When
Service(value = "AAA")
Then
String name = "Type1";
insert(name);
Something like this... but make sure not to create a loop :-)
Regards,
Frank
ChrisMu wrote:
But then that would call the service.getType() method when the rule is
run wouldn't it?
Â
I'm trying create explicit, simple rules to avoid doing extra work when
running data through them.
Â
How would you use a rule to set the value within another rule?
Â
Thanks
Chris
________________________________
From: FrankVhh [via Drools]
[mailto:[hidden email] <http://user/SendEmail.jtp?type=node&node=3006773&i=0> ]
Sent: 31 May 2011 16:48
To: Mullard, Christopher
Subject: Re: Smart Templates
Hi,
The way I see it, this is the way your template should look like. I do
not see the need to use eval() at all.
rule "DC_0"
when
  $service: Service(name == "@{service}", value == "@{value}")
  $riskType: RiskType()
then
  $riskType.setName($service.getType("@{value}"));
  $riskType.setAtt(0,"@{value}");
end
I am assuming that RiskType is already inserted in WM, but you could
just as well create a new object in the then-part of the rule.
In stead of using the java-function to determine the name, you might
actually just as well create an other rule that sets the name according
to the value, thus putting the entire decision logic in rules.
Hope this helps.
Regards,
Frank
    ChrisMu wrote:
    Hi,
   Â
     I'm trying to get a template (.drt) to generate 2 rules (.drl)
from 2 datasets but by doing a little bit more work than direct
substitution.
   Â
    Data (service,value):
    DC, AAA
    DC, XYZ
   Â
    Idea for the template - if value is of type1 then create Type
object with 'Type1' as name. If value is of type2, use 'Type2' as name:
   Â
    rule "DC_@{row.rowNumber}"
    when
      Service(name == "DC")  Â
    then
      Type.setName(eval(Service.getType(@{value})))
      Type.setAtt(0,@{value})
    end template
   Â
    eval(Service.getType(@{arg0})) should take 'AAA' or 'XYZ' etc as
arg and return a string Type1/Type2 etc.
   Â
    This would then generate 2 rules that look like:
   Â
    rule "DC_0"
    when
      Service(name == "DC", value == "AAA")  Â
    then
      RiskType.setName("Type1")
      RiskType.setAtt(0,"AAA")
   Â
    rule "DC_1"
    when
      Service(name == "DC", value == "XYZ")  Â
    then
      RiskType.setName("Type2")
      RiskType.setAtt(0,"XYZ")
   Â
    ...is this possible at all? I'm trying to avoid the eval step
being done in the actual rule (.drl) .
   Â
    Thanks
   Â
    Chris
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