How to traverse a hierarchy?
by Charles Binford
All, I'm trying to figure out a better way to solve this problem. I
have a batch of objects that I want matched against a hierarchy of
rules. I check the rules in order, and as soon as I find a match I'm
done for that level of the hierarchy. In other words, If the object
matches a rule, we'll check the rules children, but not the siblings.
Example:
rule 1
rule 1.1
rule 1.2
rule 1.2.1
rule 1.2.2
rule 1.3
rule 2
If an object matches rule 1, check for a match at level "1.*", but rule
2 will never be checked. If an object matches 1, 1.2, and 1.2.1, we're
done as 1.2.1 has no children.
My current implementation with drools works, but is very inefficient. I
have a "level" string in the objects and whenever I find a match I
update the level of the object and force an object update. Each rule
tests that the level string is correct, e.g. rule 1.2.1 works as follows:
rule "1.2.1"
when
obj(level matches "1.2.*",.....)
...
then
objSetLevel("1.2.1.*");
....
end
I'm also using saliance to keep the evaluation order like I want it.
Changing the contents of the object and doing the update is not good for
drools performance as I understand it so I'm looking for a better way.
The hierarchy and the order of the matching is key to my application so
I'm not wanting to redesign that part of things.
I tried using activation-groups. That worked great as long as I only
had a single object to run through the hierarchy, but given the way the
rest of the system is design I need to load up 10-100 objects before
each call to fireallrules() for performance purposes.
Any suggestions are appreciated.
Charles Binford
17 years, 2 months
Backward chaining in drools 5?
by Alberto Cabas Vidani
I read the information available about drools 5, but support to backward
chaining is never mentioned. Since in the documentation of Drools 4 it's
said that it will be supported in the next major release I'm wondering
wether it will be present in release 5. Does anyone know something about it?
Alberto
17 years, 2 months
loading dsl based rule using KnowledgeAgent
by Diego López León
Hi all,
I'm on 5.0.0.CR1 and when I try to use KnowlegeAgent to load my
dsl-based rules the builder is unable to expand them. I'm using
KnowledgeAgent for a future transparent migration to guvnor but at
this stage I want to load the rules locally.
My changesets.xml is
<change-set>
<add>
<resource source='classpath:rules/couriers-flow.rf' type='DRF' />
<resource source='classpath:rules/correos.dsl' type='DSL' />
<resource source='classpath:rules/common-rules.drl' type='DRL' />
<resource source='classpath:rules/correo-argentino.drl' type='DRL' />
<resource source='classpath:rules/oca-postal.drl' type='DRL' />
</add>
<change-set>
The error
[2009:04:103 19:04:261:debug] KnowledgeAgent has KnowledgeBuilder
errors object=[6] Unable to expand: va desde "Buenos Aires"
"PROVINCIA" hasta "Mendoza" "PROVINCIA"[8] Unable to expand: envialo
en "Local" por "Correo Argentino"[6] Unable to expand: va desde
"Capital Federal" "PROVINCIA" hasta "General Roca" "CIUDAD"[8] Unable
to expand: envialo en "Regional" por "Correo Argentino"[5] Unable to
expand: $shipping : ShippingQuery()[6] Unable to expand:
GeoNode($srcName: name, type == GeoNodeType.PAIS) from
$shipping.currentSrc[7] Unable to expand: GeoNode(name == $srcName,
type == GeoNodeType.PAIS) from $shipping.currentDest[9] Unable to
expand: insert(new RuleResultCourierProduct("Correo Argentino",
"Nacional"));[4] Unable to expand: $shipping :
ShippingQuery(generalizable == true)[5] Unable to expand: not (exists
(RuleResultCourierProduct()))[7] Unable to expand:
generalize($shipping);[8] Unable to expand: update ($shipping);[6]
Unable to expand: $shipping : ShippingQuery()[7] Unable to expand:
exists (RuleResultCourierProduct(courierName=="Correo Argentino"))[9]
Unable to expand: $shipping.fullReset();[8,2]: [ERR 101] Line 8:2 no
viable alternative at input 'va' in rule "Buenos Aires a Mendoza por
Correo Argentino"[18,2]: [ERR 101] Line 18:2 no viable alternative at
input 'va' in rule "Capital Federal a General Roca por Correo
Argentino"
The plugin for eclipse expands it without any problem so I'm
discarding parse errors (Is this reasonable?)
Any idea about this issue?
Best regards.
--
diego
17 years, 2 months
Forrest Vs DocBook - your experience
by Arjun Dhar
Hey,
I think I saw Apache-Forrest being used in your docs earlier sometime. Now when
I look at the POM I see DOC Book plugin.
The Drools documentation is 'pretty' (thanks); just wanted to know if you guys
employ forrest. And Are you using the two together or your doing away with one
(and whats the reason).
Interested to hear your views/experience.
Thanks,
Arjun
17 years, 2 months
Re: [rules-users] Drools flow and BPEL (Drools 5.0.0.M5)
by sarish
Do you mean to say that JBPM-BPEL 1.1.1 does not support BPEL 2.0?
As per the home page of documentation, they say they are compliant with BPEL
2.0.
Mark Proctor wrote:
>
> Umesh Wankhede wrote:
>>
>>
>> Mark Proctor wrote:
>>> Umesh Wankhede wrote:
>>>>
>>>>
>>>> Mark Proctor wrote:
>>>>> Umesh Wankhede wrote:
>>>>>> Hi
>>>>>>
>>>>>> I am trying to evaluate various features (rules and workflow) of
>>>>>> Drools 5.0. What I understand from docs (drools-docs-flow.pdf -
>>>>>> page 5) is that the Drools flow engine is based on generic process
>>>>>> engine that allows the execution of different process languages
>>>>>> like RuleFlow, BPEL, OSWorkflow, etc. Although I am able to do PoC
>>>>>> (Proof of Concept) with RuleFlow, there isn't any
>>>>>> documentation/samples available for using BPEL as process
>>>>>> language. Also I don't find any more information on blogs, etc.
>>>>>> If anyone has done something similar, please let me know, or any
>>>>>> pointers would help.
>>>>> There is no BPEL product, Drools COULD do BPEL, but we haven't made
>>>>> it do so yet. It is more likely we would look to integrate an
>>>>> existing BPEL product like ODE, as the execution engine is the easy
>>>>> bit, it's all the xml manipulations that are time consuming.
>>>> So that means I would have to go with jBPM for BPEL support (and
>>>> losing the advantage of tight rule engine integration provided in
>>>> Drools). How far would be the BPEL support in Drools in the roadmap?
>>> If you are going to use BPEL I would recommend ODE, jBPM BPEL is not
>>> BPEL 2.0, but 1.0, which is very limited. ODE is likely to be the
>>> BPEL engine we integrated into Drools.
>>>
>>> More importantly though, have a good think on why it is you are using
>>> BPEL, as in reality it's generally too low level for end users to use
>>> effectively.
>> The primary language would be RuleFlow or jPDL, but we are also
>> looking at BPEL support (product requirements driven). So we have to
>> make a choice between jBPM or Drools 5.0. The latter option looks
>> more suitable for our requirement which provides tightly integrated
>> rule support, but lack of BPEL support currently is making the
>> decision tougher.
> If you are going to choose a BPEL product, make sure you choose one that
> supports BPEL 2.0, or you'll be shooting yourself in the foot, Apache
> ODE is the more complete BPEL 2.0 engine.
>>>>>>
>>>>>> Thanks
>>>>>> Umesh
>>>>>>
>>>>>>
>>>>>> Legal Notice: This transmission, including any attachments, is
>>>>>> confidential, proprietary, and may be privileged. It is intended
>>>>>> solely for
>>>>>> the intended recipient. If you are not the intended recipient, you
>>>>>> have received this transmission in error and you are hereby
>>>>>> advised that any
>>>>>> review, disclosure, copying, distribution, or use of this
>>>>>> transmission, or any of the information included therein, is
>>>>>> unauthorized and strictly
>>>>>> prohibited. If you have received this transmission in error,
>>>>>> please immediately notify the sender by reply and permanently
>>>>>> delete all copies of
>>>>>> this transmission and its attachments
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> 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
>>>> _______________________________________________
>>>> 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
>> _______________________________________________
>> 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
>
>
--
View this message in context: http://www.nabble.com/Drools-flow-and-BPEL-%28Drools-5.0.0.M5%29-tp223513...
Sent from the drools - user mailing list archive at Nabble.com.
17 years, 2 months
Keep getting error trying to access value in hash map.
by samd
I'm trying to extract the value from a hashmap after first extracting a key
and I keep getting the same error.
Here is the rule information:
target: Target();
perm: PermissionCheck(target == target, action == "edit", granted == false);
primaryKey : TargetId(targetNum == 1) from target.codes.keySet();
primaryCode : TargetCode() from target.codes.values[primaryKey];
Here is the error:
Caused by: javax.el.ELException: /layout/test.xhtml @25,111
rendered="#{s:hasPermission(target,'edit')}": org.mvel.CompileException:
unable to resolve property: values
at
com.sun.facelets.el.TagValueExpression.getValue(TagValueExpression.java:76)
at
javax.faces.component.UIComponentBase.isRendered(UIComponentBase.java:390)
... 61 more
Caused by: org.mvel.CompileException: unable to resolve property: values
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAcces
sorOptimizer.java:288)
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAcce
ssorOptimizer.java:109)
at
org.mvel.ast.VariableDeepPropertyNode.getReducedValueAccelerated(VariableDeepPropertyNode
.java:29)
Thanks
--
View this message in context: http://www.nabble.com/Keep-getting-error-trying-to-access-value-in-hash-m...
Sent from the drools - user mailing list archive at Nabble.com.
17 years, 2 months
Counting rules matches within a rule + optimizing evals
by Arjun Dhar
Hi,
I have many rules. These rules may or may not belong to the same set. However,
based on their name they can be grouped. Say all rules starting with
"Traffic_Rule", "Criminal_Rule" etc.
Q1. I want to check after assertion of a fact (A.) how many and (B.) which all
rules executed for "Traffic_Rule" and the result will fire another rule.
(So I want all this in the rules files only) - So in a way I want to collect the
consequences and based on the result of that consequence set fire more rules.
Q2. evals() are expensive. I dont think we can assign the output of an eval in
the condition to a variable; so how do I re-use an eval in a condition and then
in the consequence? (To avoid calling the function multiple times)
P.S: Can someone please do something about that spammer (Vacation Reply)
regards,
Arjun
17 years, 2 months
