[rules-users] Smart Templates

[FrankVhh]

But then that would call the service.getType() method when the rule is
run wouldn't it?
-> Yes
 
I'm trying create explicit, simple rules to avoid doing extra work when
running data through them.
-> OK, in essence, I like that :-)
 
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?
>  
> I'm trying create explicit, simple rules to avoid doing extra work when
> running data through them.
>  
> How would you use a rule to set the value within another rule?
>  
> Thanks
> Chris
> 
> ________________________________
> 
> From: FrankVhh [via Drools]
> [mailto:ml-node+3006589-784869490-404175 at n3.nabble.com] 
> 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, 
> 	
> 	 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. 
> 	
> 	Data (service,value): 
> 	DC, AAA 
> 	DC, XYZ 
> 	
> 	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: 
> 	
> 	rule "DC_@{row.rowNumber}" 
> 	when 
> 	    Service(name == "DC")     
> 	then 
> 	    Type.setName(eval(Service.getType(@{value}))) 
> 	    Type.setAtt(0,@{value}) 
> 	end template 
> 	
> 	eval(Service.getType(@{arg0})) should take 'AAA' or 'XYZ' etc as
> arg and return a string Type1/Type2 etc. 
> 	
> 	This would then generate 2 rules that look like: 
> 	
> 	rule "DC_0" 
> 	when 
> 	    Service(name == "DC", value == "AAA")     
> 	then 
> 	    RiskType.setName("Type1") 
> 	    RiskType.setAtt(0,"AAA") 
> 	
> 	rule "DC_1" 
> 	when 
> 	    Service(name == "DC", value == "XYZ")     
> 	then 
> 	    RiskType.setName("Type2") 
> 	    RiskType.setAtt(0,"XYZ") 
> 	
> 	...is this possible at all? I'm trying to avoid the eval step
> being done in the actual rule (.drl) . 
> 	
> 	Thanks 
> 	
> 	Chris 
> 
> 
> 
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