[rules-users] Somewhat strange question: Rules without a RHS

[Wolfgang Laun]

On 16/05/2012, Joe Ammann <joe at pyx.ch> wrote:
> On 05/15/2012 07:24 PM, Wolfgang Laun wrote:
>> Assuming you can get hold of the resulting DRL text, a simple script
>> might detect rules where there is nothing between "then" and "end".
> I have currently implemented something similar. A REST client that
> periodically scans the BRLs in certain Guvnor packages and fills out
> missing RHS. Problem is that the users try to test their broken rules
> faster than this script can fix them :-/

You can easily design your DSL/DSLR in such a way that the expanded text is
jinxed, to be rectified by your scanning script. That way, they won't be
able to exec without some Joe's blessing ;-)

>>
>> Otherwise, following the techniques used in the Guvnor's validator,
>> you can investigate the consequence text and use heuristics to
>> detect the bad ones.
> I was looking for exactly that: an option to replace or inject custom
> extensions to what you refer to as "Guvnor's validator". But I must
> admit that I was not able to find any pointer to this in the doc or the
> Guvnor source. Can you point me to the place in the Guvnor source where
> that validation actually happens? I might then be able to develop some
> ideas.

There's drools-verifier-5.4.0.Beta2-sources.jar in Expert's sources. Look at
   org/drools/verifier/Consequence.drl

The first rule is called "No action - possibly commented out".

-W

>
> --
> CU, Joe
>
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