Re: [rules-users] drools quirks

On 18 September 2010 16:15, Matt Young <solid(a)youngdev.net <mailto:solid@youngdev.net>> wrote: I just started using drools and this is my first time implementing a rules engine. Everything has been pretty smooth but I have some quirks that I am not sure I can live with. 1) for some reason, if I execute the Knowlege session against an object, the knowlege session never returns. > I don't understand the term "execute...against an object". Do you > mean that you have just one fact inserted befor you call > fireAllRules()? > But anyway, this call not returning is almost certainly due to a > loop in your rules, or have you made sure that they don't? The only way I can get the ksession to return is to make IF (obj == null) part of the LHS and make modify($input){setObj("complete")} part of the RHS This seems like a deficiency since I have users writing their own rules, I can see them forgetting this requirement. > Writing rules is programming, no holds barred :-) > Look into Domain Specific Languages (DSL) as a cushion for the > unwary. IS their a way to get the ksession to firerules only once? If so what does that look like? > kSession.fireUntilHalt( 1 ); 2) It seems that any code I want can be executed in the RHS. I could literally execute something like the following in the RHS. byte[] b= new byte[10000000000000]; // Really big memory waste I also could just start a bunch of threads. The point is that I am intending to let the users write their own rules but I can't do that if there are no restrictions on how/what can be done inside the rules. Any suggestions? Are there sandboxes or filters I can activate to restrict the RHS? > Again: DSL. > Also, Rule Templates might be the starting point; it'd depend on > what the may be allowed to do. > And what about good old-fashioned training?! > -W

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