[rules-users] Getting validation errors

[Edson Tirelli]

   Mike

   What I usually see is that you have a fact or attribute where you can 
set the result of your validation:

rule "user is miked"
when
    $id : Identity( usename == "miked" )
    $p : Permission( id == $id )
then
    $p.deny();
end

   In your application you asserted the Permission object, so you have 
it's handle and just check the result:

if( permission.isDenied() ) {
    // do something
}

   Another way would be to use call back, setting the callback instance 
as a global:

global org.sample.PermissionManager permission;

rule "user is miked"
when
    $id : Identity( usename == "miked" )
then
    permission.deny( $id );
end

   []s
   Edson

Mike Dougherty wrote:

> Hello,
>
> I am using JBoss Rules to validate entities before storing them in the 
> database. I therefore need a way to inform the calling code that the 
> entity which was asserted failed verification. The only way I have 
> been able to find that works is to assert an exception from within the 
> rule file. For example:
>
> rule "user is 'miked'"
>   when
>     identity : Identity( username == "miked" )
>   then
>     assertLogical(new IllegalStateException("Entity failed 
> verification."));
> end
>
> Then in the Java that fires the rule, I have:
>
> workingMemory.fireAllRules();
> for(Iterator i = workingMemory.getObjects(Exception.class).iterator(); 
> i.hasNext(); ) {
>     System.out.println("Exception: "+i.next());
> }
>
> Which seems to be working OK. But I wanted to see if maybe there is a 
> better way to accomplish what I need.
>
> Thanks for you help.
> Mike
>
>
> --
> *********************************
> Mike Dougherty
> mjdougherty at gmail.com <mailto:mjdougherty at gmail.com>
> 858.232.3635
>
> http://www.google.com/talk/
> *********************************
>
>
>
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>
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-- 
 Edson Tirelli
 Software Engineer - JBoss Rules Core Developer
 Office: +55 11 3124-6000
 Mobile: +55 11 9218-4151
 JBoss, a division of Red Hat @ www.jboss.com