[rules-users] how to stop rule execution

[Swindells, Thomas]

If you want to stop execution you can do
kcontext.getKnowledgeRuntime().halt();

However this will only get executed once all the rules have been evaluated so it can’t be used to prevent null pointer exceptions in condtions.

Another approach which may (or may not) work is to get your condition to actually throw an exception if the condition doesn’t match this will normally stop the execution as well.
Eg
function isNull(Object o)
                if(o == null) throw new ValidationException(“Object is null  :(“);
return false;
end

rule “blagh”
when
          eval(isNull(someObject))
then
          //this will never be reached as an exception will be thrown
End

(you may need to fiddle with syntax and use a java method or something.
The other key thing to remember though is if you have structured your rules correctly (null check as the very first condition) then all 100 rules will share the same null check node and you will only be doing it once not 100 times anyway and so it will make little difference on performance. (And a null check is very fast anyway). Don’t optimize until you know you actually have to – there are likely to be other far more important performance issues in your application anyway

Thomas

From: rules-users-bounces at lists.jboss.org [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Sathya Prakash
Sent: 16 February 2011 22:51
To: Mauricio Salatino; michael.anstis at gmail.com
Cc: Rules Users List
Subject: Re: [rules-users] how to stop rule execution

I got great Idea by this discussion.

If there is no way of stopping rules then I can do this null condition check before executing rules. Adding one action in JBoss ESB will solve problem.

Please suggest me.

Many Thanks in advance.


Regards,
Sathya Prakash.
On Thu, Feb 17, 2011 at 2:39 AM, Sathya Prakash <prakashagarval at gmail.com<mailto:prakashagarval at gmail.com>> wrote:
Thanks for your suggestion..

But let us assume i have 100 rules based on single response. When response is null then if i am doing null check in all rules then it degrades the performance.  My application hits are  million per day. if 1 % percent fails think about the impact.

Regards,
Sathya Prakash.

On Thu, Feb 17, 2011 at 2:26 AM, Mauricio Salatino <salaboy at gmail.com<mailto:salaboy at gmail.com>> wrote:
you can do something like:
rule "Error Check"
salience 100

when
error condition check
then
System.Out.Println("Response has errors");
XXXXXXXXXXXXXXXXXXXXXXXX to exit from rule execution
insert(Stop())
end


rule "Rule-01"
salience 99
when
not(Stop())
repsonse.getxx()

then

end.

2011/2/16 Sathya Prakash <prakashagarval at gmail.com<mailto:prakashagarval at gmail.com>>
Hi,

How to stop rule execution in  technical rule,
Example

rule "Error Check"
salience 100

when
error condition check
then
System.Out.Println("Response has errors");
XXXXXXXXXXXXXXXXXXXXXXXX to exit from rule execution
end


rule "Rule-01"
salience 99
when
repsonse.getxx()

then

end.

if first rule then part executed means the response is error hence we should not execute second.
Is there any way to exit rule execution.


Regards,
Sathya Prakash.

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--
Cheers,
Sathya Prakash.
సత్య ప్రకాష్.




--
Cheers,
Sathya Prakash.
సత్య ప్రకాష్.


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