2:47 p.m.
Hi,
I've tried to figure this out but haven't been able to.
How can I, from the RHS, figure out the details of what triggered a rule.
I can access the facts individually by name, but how do I do it in a
generic fashion that would work in the RHS of any rule?
I am using decisiontables and want to be able to have a function that is
something like printTriggeringDetails()
I came across drools.getTuple but am not sure if that's the correct path
to go on. From there I get InternalFactHandles but don't know how to turn
those into human-readable facts.
Thanks for any help,
Archie
3:26 a.m.
This may be more conveniently done from an event listener but
drools.getActivation() should give you the Activation. Then you get
the Collection<FactHandle>.
For each of them,
org.drools.runtime.KnowledgeRuntime.getObject(
org.drools.runtime.rule.FactHandle )
gives you the fact objects that participates.
You can also access bindings:
List<String> declIds = activation.getDeclarationIDs();
Object declVal = activation.getDeclarationValue( declId );
Be careful, things may have passed away, i.e., you can get nulls.
-W
2011/2/16 Archie Russell <archier(a)gmail.com>:
Hi,
I've tried to figure this out but haven't been able to.
How can I, from the RHS, figure out the details of what triggered a rule.
I can access the facts individually by name, but how do I do it in a
generic fashion that would work in the RHS of any rule?
I am using decisiontables and want to be able to have a function that is
something like printTriggeringDetails()
I came across drools.getTuple but am not sure if that's the correct path
to go on. From there I get InternalFactHandles but don't know how to turn
those into human-readable facts.
Thanks for any help,
Archie
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1:58 p.m.
Thanks Wolfgang, I'll give this a shot.
Is there any way to avoid the "things may have passed away" issue? Would
event listeners handle that?
On Thu, Feb 17, 2011 at 1:26 AM, Wolfgang Laun <wolfgang.laun(a)gmail.com>wrote:
This may be more conveniently done from an event listener but
drools.getActivation() should give you the Activation. Then you get
the Collection<FactHandle>.
For each of them,
org.drools.runtime.KnowledgeRuntime.getObject(
org.drools.runtime.rule.FactHandle )
gives you the fact objects that participates.
You can also access bindings:
List<String> declIds = activation.getDeclarationIDs();
Object declVal = activation.getDeclarationValue( declId );
Be careful, things may have passed away, i.e., you can get nulls.
-W
2011/2/16 Archie Russell <archier(a)gmail.com>:
>
> Hi,
> I've tried to figure this out but haven't been able to.
> How can I, from the RHS, figure out the details of what triggered a rule.
> I can access the facts individually by name, but how do I do it in a
> generic fashion that would work in the RHS of any rule?
> I am using decisiontables and want to be able to have a function that is
> something like printTriggeringDetails()
> I came across drools.getTuple but am not sure if that's the correct path
> to go on. From there I get InternalFactHandles but don't know how to
turn
> those into human-readable facts.
> Thanks for any help,
> Archie
>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>
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1:04 a.m.
2011/2/22 Archie Russell <archier(a)gmail.com>:
Thanks Wolfgang, I'll give this a shot.
Is there any way to avoid the "things may have passed away" issue? Would
event listeners handle that?
No, it's the same issue anywhere. It depends on whether you have
retracts in the consequence and when you execute the value-sniffing
code. Just slap it into a try/catch
and ignore NPEs
try {
Object declVal = activation.getDeclarationValue( declId );
if( declVal != null ){
pStream.print( " " + declId + ": " + declVal.toString()
);
} else {
pStream.print( " " + declId + ": null" );
}
} catch( NullPointerException npe ){
// Silently ignore. This is a bug in getDeclarationIDs, which
// should not return "evil" IDs referencing retracted facts.
}
On Thu, Feb 17, 2011 at 1:26 AM, Wolfgang Laun <wolfgang.laun(a)gmail.com>
wrote:
>
> This may be more conveniently done from an event listener but
> drools.getActivation() should give you the Activation. Then you get
> the Collection<FactHandle>.
>
> For each of them,
> org.drools.runtime.KnowledgeRuntime.getObject(
> org.drools.runtime.rule.FactHandle )
> gives you the fact objects that participates.
>
> You can also access bindings:
> List<String> declIds = activation.getDeclarationIDs();
> Object declVal = activation.getDeclarationValue( declId );
> Be careful, things may have passed away, i.e., you can get nulls.
>
> -W
>
> 2011/2/16 Archie Russell <archier(a)gmail.com>:
> >
> > Hi,
> > I've tried to figure this out but haven't been able to.
> > How can I, from the RHS, figure out the details of what triggered a
> > rule.
> > I can access the facts individually by name, but how do I do it in a
> > generic fashion that would work in the RHS of any rule?
> > I am using decisiontables and want to be able to have a function that is
> > something like printTriggeringDetails()
> > I came across drools.getTuple but am not sure if that's the correct path
> > to go on. From there I get InternalFactHandles but don't know how to
> > turn
> > those into human-readable facts.
> > Thanks for any help,
> > Archie
> >
> > _______________________________________________
> > rules-users mailing list
> > rules-users(a)lists.jboss.org
> > https://lists.jboss.org/mailman/listinfo/rules-users
> >
> >
>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
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6:37 p.m.
Can I get the "drools" variable from my java code? Or is this only
available inside
rules?
A
On Thu, Feb 17, 2011 at 1:26 AM, Wolfgang Laun <wolfgang.laun(a)gmail.com>wrote:
This may be more conveniently done from an event listener but
drools.getActivation() should give you the Activation. Then you get
the Collection<FactHandle>.
For each of them,
org.drools.runtime.KnowledgeRuntime.getObject(
org.drools.runtime.rule.FactHandle )
gives you the fact objects that participates.
You can also access bindings:
List<String> declIds = activation.getDeclarationIDs();
Object declVal = activation.getDeclarationValue( declId );
Be careful, things may have passed away, i.e., you can get nulls.
-W
2011/2/16 Archie Russell <archier(a)gmail.com>:
>
> Hi,
> I've tried to figure this out but haven't been able to.
> How can I, from the RHS, figure out the details of what triggered a rule.
> I can access the facts individually by name, but how do I do it in a
> generic fashion that would work in the RHS of any rule?
> I am using decisiontables and want to be able to have a function that is
> something like printTriggeringDetails()
> I came across drools.getTuple but am not sure if that's the correct path
> to go on. From there I get InternalFactHandles but don't know how to
turn
> those into human-readable facts.
> Thanks for any help,
> Archie
>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>
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11:09 p.m.
On 16/02/2011 20:47, Archie Russell wrote:
Hi,
I've tried to figure this out but haven't been able to.
How can I, from the RHS, figure out the details of what triggered a rule.
I can access the facts individually by name, but how do I do it in a
generic fashion that would work in the RHS of any rule?
Look at
RuleContext.getActivation()
You can use either the deprecated "drools" identifier or the new
kcontext to achieve this. getACtivation has the following methods:
/**
*
* @return
* The PropagationContext that created this Activation
*/
PropagationContext getPropagationContext();
/**
*
* @return
* The matched FactHandles for this activation
*/
List< ? extends FactHandle> getFactHandles();
/**
* Returns the list of objects that make the tuple that created
* this activation. The objects are in the proper tuple order.
*
* @return
*/
List< Object > getObjects();
/**
* Returns the list of declaration identifiers that are bound to the
* tuple that created this activation.
*
* @return
*/
List< String > getDeclarationIDs();
/**
* Returns the bound declaration value for the given declaration
identifier.
*
* @param declarationId
* @return
*/
Object getDeclarationValue( String declarationId );
Mark
I am using decisiontables and want to be able to have a function that is
something like printTriggeringDetails()
I came across drools.getTuple but am not sure if that's the correct path
to go on. From there I get InternalFactHandles but don't know how to
turn
those into human-readable facts.
Thanks for any help,
Archie
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rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
2:46 a.m.
On 23/02/2011 07:39, Wolfgang Laun wrote:
2011/2/23 Mark Proctor<mproctor(a)codehaus.org>:
> the deprecated "drools" identifier
The "Expert" documentation doesn't say so.
-W
KnowledgeHelper was depcreated as it's in "core", but not in
"api".
Instead "api" has RuleContext and it is that which is exposed via the
keyword "kcontext". Please update :)
Mark
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11:10 p.m.
On 16/02/2011 20:47, Archie Russell wrote:
Hi,
I've tried to figure this out but haven't been able to.
How can I, from the RHS, figure out the details of what triggered a rule.
I can access the facts individually by name, but how do I do it in a
generic fashion that would work in the RHS of any rule?
I am using decisiontables and want to be able to have a function that is
something like printTriggeringDetails()
printTriggeringDetails(
kcontext.getActivation() )
I came across drools.getTuple but am not sure if that's the correct path
to go on. From there I get InternalFactHandles but don't know how to
turn
those into human-readable facts.
Thanks for any help,
Archie
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