[rules-users] Smart Templates

Wed Jun 1 10:44:27 EDT 2011

In the Drools Expert manual, search for
"And, finally, here is an example of Import, Variables and Functions."

The figure below shows cells from a spreadsheet.
-W

2011/6/1 ChrisMu <christopher.mullard at credit-suisse.com>

> Sorry - you're losing me - could you give an example please?
>
> Thanks
>
>  ------------------------------
> *From:* Wolfgang Laun-2 [via Drools] [mailto:[hidden email]<http://user/SendEmail.jtp?type=node&node=3011008&i=0>]
>
> *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]<http://user/SendEmail.jtp?type=node&node=3010989&i=0>
> >
>
>  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
>>> 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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