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@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]
<http://user/SendEmail.jtp?type=node&node=3010490&i=0> ]
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]
<http://user/SendEmail.jtp?type=node&node=3010275&i=0>
>
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]
<http://user/SendEmail.jtp?type=node&node=3010119&i=0> ]
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
  Service( $name: name, $value: value )
  $sb: ServiceBean( name == $name, value == $value )
then
  # RiskType ... is what?
  ...$value..., ...$sb.getType()...
end
-W
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