[rules-users] Smart Templates

FrankVhh frank.vanhoenshoven at agserv.eu
Wed Jun 1 10:56:31 EDT 2011 

Hi,

Basically, you have 2 options.

1) You call the function getType() from your .drl file. The function will be
executed at runtime.

header
name
value

TEMPLATE
WHEN
blabla
THEN
$type.setName($service.getType("@{value}"));

2) Execute the function before you compile your rules with Rule Templates.
I.e. make sure your objects have an attribute whose value will be set by
getType() and use this value in the Template.

header
name
value
type

TEMPLATE
WHEN
blabla
THEN
$type.setName("@{type}");

Hope this helps.

Btw, am I understanding it correctly that you do not want to use a Decision
Table because you are worried about manageability of your ruleset? And, in
stead, you want to create rules directly from Java objects, using templates.
If this is correct, could you tell me how you are going to manage these
objects?

Regards,
Frank



ChrisMu wrote:
> 
> Sorry - you're losing me - could you give an example please?
> 
> Thanks
> 
> ________________________________
> 
> From: Wolfgang Laun-2 [via Drools]
> [mailto:ml-node+3010989-1781642469-404175 at n3.nabble.com] 
> Sent: 01 June 2011 15:25
> To: Mullard, Christopher
> Subject: Re: [rules-users] Smart Templates
> 
> 
> It's just like a Java static method. Call JAva code if you don't want to
> put it all into DRL function, or import from Java in the first place. Both
> "import" and "function" can be used in spreadsheets.
> -W
> 
> 
> 
> 2011/6/1 ChrisMu <[hidden email]>
> 
> 
> 	Agreed, but this was just an example - if the function required something
> more complicated - say a DB lookup, could it be done?
> 
> ________________________________
> 
> 	From: Wolfgang Laun-2 [via Drools] [mailto:[hidden email]
> &lt;http://user/SendEmail.jtp?type=node&amp;node=3010490&amp;i=0&gt; ] 
> 	Sent: 01 June 2011 12:40
> 	To: Mullard, Christopher
> 	Subject: Re: [rules-users] Smart Templates
> 	
> 	
> 	If there are just 2 types (IRDELTA, COMLEASEDELTA) you can add a function
> that computes this from the 3-letter name.
> 	-W
> 	
> 	
> 	
> 	2011/6/1 ChrisMu <[hidden email]
> &lt;http://user/SendEmail.jtp?type=node&amp;node=3010275&amp;i=0&gt; >
> 	
> 
> 		Possibly. Let me try again with what I'm trying to achieve.
> 		Given this excerpt from a decision table:
> 		 
> 		
> 		 
> 		Basically I want to be able to specify a template that says 'If Arg0 is
> a currency, output RiskType IRDELTA (and currency), if Arg0 is a commodity
> (begins with 'X') then output RiskType COMLEASEDELTA (and commodity).
> 		 
> 		When fed with data, this would generate the rules:
> 		 
> 		when Arg0 = USD, output RiskType IRDELTA, USD
> 		when Arg0 = GBP, output RiskType IRDELTA, GBP
> 		etc
> 		when Arg0 = XAU, output RiskType COMLEASEDELTA, XAU
> 		etc
> 		 
> 		In this way theRiskType name is inferred from the data when the rules
> are generated. It can be done by explicitly stating all possible
> combinations as in the decision table above but that gets tedious quickly.
> I wanted to have a more general template that could generate all the
> specific rules instances.
> 		 
> 		Does that make more sense?
> 		 
> 		Thanks
> 		Chris
> 		 
> 
> ________________________________
> 
> 		From: Wolfgang Laun-2 [via Drools] [mailto:[hidden email]
> &lt;http://user/SendEmail.jtp?type=node&amp;node=3010119&amp;i=0&gt; ] 
> 		Sent: 01 June 2011 11:21
> 		To: Mullard, Christopher
> 		Subject: Re: [rules-users] Smart Templates
> 		
> 		
> 		I don't want to confuse you, but have you considered not using templates
> at all? If you can generate N rules from N objects containing different
> literals for matching a fact or for updating a fact field, then you can
> achieve the same thing with a single rule and additional facts containing
> those literal values.
> 		
> 		rule "one 4 all"
> 		when
> 		Â Â  Service( $name: name, $value: value )
> 		Â Â  $sb: ServiceBean( name == $name, value == $value )
> 		then
> 		Â Â  # RiskType ... is what?
> 		Â Â  ...$value..., ...$sb.getType()... 
> 		end
> 		
> 		-W
> 		
> 		
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