On 18 September 2010 16:15, Matt Young <span dir="ltr"><<a href="mailto:solid@youngdev.net">solid@youngdev.net</a>></span> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
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I just started using drools and this is my first time implementing a<br>
rules engine. Everything has been pretty smooth but I have some<br>
quirks that I am not sure I can live with.<br>
1) for some reason, if I execute the Knowlege session against an<br>
object, the knowlege session never returns.</blockquote><div><br>I don't understand the term "execute...against an object". Do you mean<br>that you have just one fact inserted befor you call fireAllRules()?<br>
<br>But anyway, this call not returning is almost certainly due to a loop<br>in your rules, or have you made sure that they don't?<br> </div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
The only way I can get<br>
the ksession to return is to make IF (obj == null) part of the LHS and<br>
make modify($input){setObj("complete")} part of the RHS<br>
This seems like a deficiency since I have users writing their own<br>
rules, I can see them forgetting this requirement.</blockquote><div><br>Writing rules is programming, no holds barred :-)<br><br>Look into Domain Specific Languages (DSL) as a cushion for the unwary.<br><br> </div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
IS their a way to<br>
get the ksession to firerules only once? If so what does that look like?<br></blockquote><div><br>kSession.fireUntilHalt( 1 );<br> </div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
2) It seems that any code I want can be executed in the RHS. I could<br>
literally execute something like the following in the RHS.<br>
<br>
byte[] b= new byte[10000000000000]; // Really big memory waste<br>
<br>
I also could just start a bunch of threads.<br>
<br>
The point is that I am intending to let the users write their own<br>
rules but I can't do that if there are no restrictions on how/what can<br>
be done inside the rules. Any suggestions? Are there sandboxes or<br>
filters I can activate to restrict the RHS?<br></blockquote><div><br>Again: DSL.<br><br>Also, Rule Templates might be the starting point; it'd depend on what<br>the may be allowed to do.<br><br>And what about good old-fashioned training?!<br>
<br>-W<br><br></div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<br>
- --<br>
Cheers,<br>
Matt Young<br>
<a href="mailto:solid@youngdev.net">solid@youngdev.net</a><br>
<a href="http://youngdev.net" target="_blank">http://youngdev.net</a><br>
<br>
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</blockquote></div><br>