5:35 a.m.
Hi all,
i've some problems with a ClassCastException when using the
"or"-conditional element.
I have different Java-Beans which all have some string-values. Now I
want to create one rule which is able to handle every type of my classes
because it would be a lot of work to create one rule for every class.
Depending on the type of beans in the working memory the programm is
crashing with an ClassCastException.
Here is a snippet of my drl-file with the "crashing-rule":
rule "BizLocation"
when
$epc : EPC()
QuantityEventType(epcClass == $epc.value ,$bizLoc: bizLocation
!=null ) or AggregationEventType(childEPCs.epc contains $epc, $bizLoc :
bizLocation != null) or ObjectEventType(epcList.epc contains $epc,
$bizLoc : bizLocation != null)
then
System.out.println("BizLocation: " +$bizLoc.getId());
end
There are some EPC's in the working memory and some Events (which might
be of type QuantityEventType, AggregationEventType or ObjectEventType).
When there are only ObjectEventType in the working memory, everything
works fine, but wenn there is an QuantityEventType this rule crashes
with "org.fosstrak.epcis.model.QuantityEventType cannot be cast to
org.fosstrak.epcis.model.ObjectEventType".
I've lot of other, similar rules some of them crashing, others don't.
Can anyone give me a hint where is the error?
Thanks,
Christoph
PS: Sorry for the bad english :(
7:38 a.m.
Christoph,
You can not do that, because $bizLoc would be tied to the Pattern type.
Since you have different Pattern types, you will get the class cast
exception.
Not sure if it is possible to improve variable declarations so that they
can act on different patterns, but you may open a JIRA for us to
investigate.
A workaround is if all your event classes implement an interface/super
class that contains that attribute, you may bind the variable to the
supertype attribute.
[]s
Edson
2009/5/14 Christoph Kramer <amrod(a)gmx.de>
Hi all,
i've some problems with a ClassCastException when using the
"or"-conditional element.
I have different Java-Beans which all have some string-values. Now I want
to create one rule which is able to handle every type of my classes because
it would be a lot of work to create one rule for every class.
Depending on the type of beans in the working memory the programm is
crashing with an ClassCastException.
Here is a snippet of my drl-file with the "crashing-rule":
rule "BizLocation"
when
$epc : EPC()
QuantityEventType(epcClass == $epc.value ,$bizLoc: bizLocation !=null
) or AggregationEventType(childEPCs.epc contains $epc, $bizLoc : bizLocation
!= null) or ObjectEventType(epcList.epc contains $epc, $bizLoc :
bizLocation != null)
then
System.out.println("BizLocation: " +$bizLoc.getId());
end
There are some EPC's in the working memory and some Events (which might be
of type QuantityEventType, AggregationEventType or ObjectEventType). When
there are only ObjectEventType in the working memory, everything works fine,
but wenn there is an QuantityEventType this rule crashes with
"org.fosstrak.epcis.model.QuantityEventType cannot be cast to
org.fosstrak.epcis.model.ObjectEventType".
I've lot of other, similar rules some of them crashing, others don't.
Can anyone give me a hint where is the error?
Thanks,
Christoph
PS: Sorry for the bad english :(
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rules-users(a)lists.jboss.org
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--
Edson Tirelli
JBoss Drools Core Development
JBoss, a division of Red Hat @ www.jboss.com
8:08 a.m.
Christoph,
I am not sure that this is a rules problem as it seems to be more of a Java
problem. Do you Event types all inherit from a base class? Could you not
just check to see on the base class is present? Also, you might want to add
in SMALL example of what you are trying to do in pure Java code (outside of
Rules) as it might be easy to translate.
Shannon
On Thu, May 14, 2009 at 6:35 AM, Christoph Kramer <amrod(a)gmx.de> wrote:
Hi all,
i've some problems with a ClassCastException when using the
"or"-conditional element.
I have different Java-Beans which all have some string-values. Now I want
to create one rule which is able to handle every type of my classes because
it would be a lot of work to create one rule for every class.
Depending on the type of beans in the working memory the programm is
crashing with an ClassCastException.
Here is a snippet of my drl-file with the "crashing-rule":
rule "BizLocation"
when
$epc : EPC()
QuantityEventType(epcClass == $epc.value ,$bizLoc: bizLocation !=null
) or AggregationEventType(childEPCs.epc contains $epc, $bizLoc : bizLocation
!= null) or ObjectEventType(epcList.epc contains $epc, $bizLoc :
bizLocation != null)
then
System.out.println("BizLocation: " +$bizLoc.getId());
end
There are some EPC's in the working memory and some Events (which might be
of type QuantityEventType, AggregationEventType or ObjectEventType). When
there are only ObjectEventType in the working memory, everything works fine,
but wenn there is an QuantityEventType this rule crashes with
"org.fosstrak.epcis.model.QuantityEventType cannot be cast to
org.fosstrak.epcis.model.ObjectEventType".
I've lot of other, similar rules some of them crashing, others don't.
Can anyone give me a hint where is the error?
Thanks,
Christoph
PS: Sorry for the bad english :(
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rules-users mailing list
rules-users(a)lists.jboss.org
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9:06 a.m.
Hi Shannon,
yes all eventtypes inherit from a base class, but the superclass doesn't
include all the attributes I want to acces in the rules. Unfortunately I
can't modify the classes since they're part of a library that i'm using.
Here is my intention:
I get a bunch of different events and have to extract some data.
Every event has a field with EPC's to which all the rest of the data
belongs. I want to extract all the single EPC's with its related data.
With pure Java the solution would be somethin like that:
void handleObjectEvent(ObjectEventType p_objEvent){
List<EPC> epcs = p_objEvent.getEPC();
if(epc!=null){
for(EPC e : epcs){
if(p_objEvent.getBizLocation() !=null){
doSomething(e, p_objEvent.getBizLocation());
}
if(p_objEvent.getBizStep() !=null){
doSomething(e, p_objEvent.getBizStep());
}
if(p_objEvent.getDisposition() !=null){
doSomething(e, p_objEvent.getDisposition());
}
...
...
}
}
}
For the other types of Events there would similar functions. Since there
are a lot of if-statements in the functions I thougt that it would be
nice to use rule engine instead.
Greetings,
Christoph
Shannon Lal wrote:
Christoph,
I am not sure that this is a rules problem as it seems to be more of a
Java problem. Do you Event types all inherit from a base class?
Could you not just check to see on the base class is present? Also,
you might want to add in SMALL example of what you are trying to do in
pure Java code (outside of Rules) as it might be easy to translate.
Shannon
On Thu, May 14, 2009 at 6:35 AM, Christoph Kramer <amrod(a)gmx.de
<mailto:amrod@gmx.de>> wrote:
Hi all,
i've some problems with a ClassCastException when using the
"or"-conditional element.
I have different Java-Beans which all have some string-values. Now
I want to create one rule which is able to handle every type of my
classes because it would be a lot of work to create one rule for
every class.
Depending on the type of beans in the working memory the programm
is crashing with an ClassCastException.
Here is a snippet of my drl-file with the "crashing-rule":
rule "BizLocation"
when
$epc : EPC()
QuantityEventType(epcClass == $epc.value ,$bizLoc:
bizLocation !=null ) or AggregationEventType(childEPCs.epc
contains $epc, $bizLoc : bizLocation != null) or
ObjectEventType(epcList.epc contains $epc, $bizLoc : bizLocation
!= null)
then
System.out.println("BizLocation: " +$bizLoc.getId());
end
There are some EPC's in the working memory and some Events (which
might be of type QuantityEventType, AggregationEventType or
ObjectEventType). When there are only ObjectEventType in the
working memory, everything works fine, but wenn there is an
QuantityEventType this rule crashes with
"org.fosstrak.epcis.model.QuantityEventType cannot be cast to
org.fosstrak.epcis.model.ObjectEventType".
I've lot of other, similar rules some of them crashing, others don't.
Can anyone give me a hint where is the error?
Thanks,
Christoph
PS: Sorry for the bad english :(
_______________________________________________
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rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org>
https://lists.jboss.org/mailman/listinfo/rules-users
------------------------------------------------------------------------
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9:25 a.m.
Christoph,
Just to clarify I am by no means a Drools expert so please keep this in mind
when you read my advice.
Just to clarify, each Event you have has a bunch of EPC's. Is this
correct? Are the EPC classes standard (i.e. no inheritance)? If this is
the case you could have a rule for processing your events and another rule
for processing your EPCs. Does this make sense?
rule "Process Event"
when
$event: QuantityEventType()
eval( $event.getEPC() != null )
then
insert( EPC ) --- *I would insert each EPC into working memory.
This will then fire the rule below*
System.out.println("BizLocation: " +$bizLoc.getId());
end
*rule* "Process EPC"
*when*
$epc: EPC()
*then*
//Do your EPC Specific logic here
* //Once you have done processing the EPC, I would remove it from
working memory or it will fire the rule over again for the same EPC()*
retract( $epc )
*end*
Not sure if this helps at all or not.
Shannon
On Thu, May 14, 2009 at 10:06 AM, Christoph Kramer <amrod(a)gmx.de> wrote:
Hi Shannon,
yes all eventtypes inherit from a base class, but the superclass doesn't
include all the attributes I want to acces in the rules. Unfortunately I
can't modify the classes since they're part of a library that i'm using.
Here is my intention:
I get a bunch of different events and have to extract some data.
Every event has a field with EPC's to which all the rest of the data
belongs. I want to extract all the single EPC's with its related data.
With pure Java the solution would be somethin like that:
void handleObjectEvent(ObjectEventType p_objEvent){
List<EPC> epcs = p_objEvent.getEPC();
if(epc!=null){
for(EPC e : epcs){
if(p_objEvent.getBizLocation() !=null){
doSomething(e, p_objEvent.getBizLocation());
}
if(p_objEvent.getBizStep() !=null){
doSomething(e, p_objEvent.getBizStep());
}
if(p_objEvent.getDisposition() !=null){
doSomething(e, p_objEvent.getDisposition());
}
...
...
}
}
}
For the other types of Events there would similar functions. Since there
are a lot of if-statements in the functions I thougt that it would be nice
to use rule engine instead.
Greetings,
Christoph
Shannon Lal wrote:
> Christoph,
> I am not sure that this is a rules problem as it seems to be more of a
> Java problem. Do you Event types all inherit from a base class? Could you
> not just check to see on the base class is present? Also, you might want to
> add in SMALL example of what you are trying to do in pure Java code (outside
> of Rules) as it might be easy to translate.
>
> Shannon
>
> On Thu, May 14, 2009 at 6:35 AM, Christoph Kramer <amrod(a)gmx.de <mailto:
> amrod(a)gmx.de>> wrote:
>
> Hi all,
> i've some problems with a ClassCastException when using the
> "or"-conditional element.
> I have different Java-Beans which all have some string-values. Now
> I want to create one rule which is able to handle every type of my
> classes because it would be a lot of work to create one rule for
> every class.
> Depending on the type of beans in the working memory the programm
> is crashing with an ClassCastException.
>
> Here is a snippet of my drl-file with the "crashing-rule":
>
> rule "BizLocation"
> when
> $epc : EPC()
> QuantityEventType(epcClass == $epc.value ,$bizLoc:
> bizLocation !=null ) or AggregationEventType(childEPCs.epc
> contains $epc, $bizLoc : bizLocation != null) or
> ObjectEventType(epcList.epc contains $epc, $bizLoc : bizLocation
> != null)
> then
> System.out.println("BizLocation: " +$bizLoc.getId());
> end
>
>
> There are some EPC's in the working memory and some Events (which
> might be of type QuantityEventType, AggregationEventType or
> ObjectEventType). When there are only ObjectEventType in the
> working memory, everything works fine, but wenn there is an
> QuantityEventType this rule crashes with
> "org.fosstrak.epcis.model.QuantityEventType cannot be cast to
> org.fosstrak.epcis.model.ObjectEventType".
> I've lot of other, similar rules some of them crashing, others don't.
>
>
> Can anyone give me a hint where is the error?
>
> Thanks,
> Christoph
>
> PS: Sorry for the bad english :(
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org <mailto:rules-users@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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12:57 a.m.
I can't say for sure whether it would help since I don't know how all the
rules for the different *EventType classes are related, but you might have a
look at the "template" feature. Version 5.0 has an additional feature which
will let you create bunches of similar rules from a template, inserting
parameters from a collection of objects. Using this, the BizLocation rule
could be easily produced in triplicate, once for each EventType.
-W
On Thu, May 14, 2009 at 12:35 PM, Christoph Kramer <amrod(a)gmx.de> wrote:
Hi all,
i've some problems with a ClassCastException when using the
"or"-conditional element.
I have different Java-Beans which all have some string-values. Now I want
to create one rule which is able to handle every type of my classes because
it would be a lot of work to create one rule for every class.
Depending on the type of beans in the working memory the programm is
crashing with an ClassCastException.
Here is a snippet of my drl-file with the "crashing-rule":
rule "BizLocation"
when
$epc : EPC()
QuantityEventType(epcClass == $epc.value ,$bizLoc: bizLocation !=null
) or AggregationEventType(childEPCs.epc contains $epc, $bizLoc : bizLocation
!= null) or ObjectEventType(epcList.epc contains $epc, $bizLoc :
bizLocation != null)
then
System.out.println("BizLocation: " +$bizLoc.getId());
end
There are some EPC's in the working memory and some Events (which might be
of type QuantityEventType, AggregationEventType or ObjectEventType). When
there are only ObjectEventType in the working memory, everything works fine,
but wenn there is an QuantityEventType this rule crashes with
"org.fosstrak.epcis.model.QuantityEventType cannot be cast to
org.fosstrak.epcis.model.ObjectEventType".
I've lot of other, similar rules some of them crashing, others don't.
Can anyone give me a hint where is the error?
Thanks,
Christoph
PS: Sorry for the bad english :(
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6085
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5 comments
4 participants
participants (4)
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Christoph Kramer -
Edson Tirelli -
Shannon Lal -
Wolfgang Laun