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: [email protected]
[mailto:[email protected]] On Behalf Of Sathya Prakash
Sent: 16 February 2011 22:51
To: Mauricio Salatino; [email protected]
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
<[email protected]<mailto:[email protected]>> 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
<[email protected]<mailto:[email protected]>> 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
<[email protected]<mailto:[email protected]>>
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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--
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- MyJourney @ http://salaboy.wordpress.com
- Co-Founder @ http://www.jbug.com.ar
- Salatino "Salaboy" Mauricio -
--
Cheers,
Sathya Prakash.
సత్య ప్రకాష్.
--
Cheers,
Sathya Prakash.
సత్య ప్రకాష్.
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