question on drools and method calls on facts
by Garner, Shawn
I'm under the impression that in the action clause of a rule you should only do one of the following:
1) Set a property on a Fact
2) Retract a Fact
3) Insert (Assert) a new Fact
4) Modify an existing Fact
However in some of the examples in the documentation it shows calling methods other than bean property getters and setters.
I was wondering if what other peoples opinions are on whether you should be doing more than the 4 things I listed above in a then clause of a rule.
Thanks,
SG
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16 years, 8 months
When MinaTaskClient.complete throw NullPointerException
by liuzhikun
Hi.
I use human task in JPA,when i call MinaTaskClient.complete throw below error:
java.lang.NullPointerException
at org.drools.persistence.processinstance.JPAWorkItemManager.completeWorkItem(JPAWorkItemManager.java:83)
at org.drools.process.workitem.wsht.WSHumanTaskHandler$GetCompletedTaskResponseHandler.execute(WSHumanTaskHandler.java:282)
at org.drools.task.service.TaskClientHandler.messageReceived(TaskClientHandler.java:67)
at org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.messageReceived(DefaultIoFilterChain.java:752)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:414)2009-9-2 13:50:26 org.apache.mina.filter.logging.LogLevel$4 log
at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:49)
at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:832)
at org.apache.mina.filter.codec.ProtocolCodecFilter$ProtocolDecoderOutputImpl.flush(ProtocolCodecFilter.java:379)
at org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:173)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:414)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:49)
at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:832)
at org.apache.mina.core.filterchain.DefaultIoFilterChain$HeadFilter.messageReceived(DefaultIoFilterChain.java:616)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:414)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.fireMessageReceived(DefaultIoFilterChain.java:408)
at org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPollingIoProcessor.java:578)
at org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:540)
at org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:532)
at org.apache.mina.core.polling.AbstractPollingIoProcessor.access$400(AbstractPollingIoProcessor.java:58)
at org.apache.mina.core.polling.AbstractPollingIoProcessor$Worker.run(AbstractPollingIoProcessor.java:857)
at org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:51)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
16 years, 8 months
how to use 'extend' keyword in Rule Engine
by Pardeep.Ruhil＠lntinfotech.com
Hi,
I want to use the condition of Rule 1 in Rule 2.
So for this I got to know that extend keyword will be used.
But in the documentation I have not get any details of the same.
So can you please tell me how to use extends keyword in Rule.
Thanks & Regards
Pardeep Ruhil
L&T Infotech Ltd
Mumbai
Ph: +919820283884
Larsen & Toubro Infotech Ltd.
www.Lntinfotech.com
This Document is classified as:
L&T Infotech Proprietary L&T Infotech Confidential L&T Infotech
Internal Use Only L&T Infotech General Business
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intended recipient (s) If you are not the intended recipient, please do
not use or disseminate the information, notify the sender and delete it
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16 years, 8 months
DRools 5 with spring 2.5.6
by Damien Feugas
Hi Everyone.
I'm new to Drools 5, and I'd like to use it in a spring project.
Basically, I want to load a knowledge base in a "Service" Spring object, and
use it as a dependency in others treatment objects.
Google serves me several sites on how to use Spring and previous Drools
releases, but nothing really up to date.
"Spring-modules", a kind of Spring extension wich provided a Drools
integration is deprecated.
Is there any simple way to use both Spring 2.5.6 and Drools 5.0.1 ?
Thank you in advance.
16 years, 8 months
Re: [rules-users] Trouble getting Dynamic Salience working
by Greg Barton
I hope you're not going through all of that trouble just to get the functionality from that concrete example. You get that for free with Drools' default conflict resolution, which includes "specificity." Specificity means that rules with the more specific conditions, and all else equal, are fired first. So between these two rules, only the CheeseSausagePepperoniPepper one fires:
rule "CheeseOnly"
when
p : Pizza( )
t1: Topping( pizza == p, name == "cheese" )
then
System.out.println( "Eating cheese pizza" );
retract( t1 );
retract( p );
end
rule "CheeseSausagePepperoniPepper"
when
p : Pizza( )
t1: Topping( pizza == p, name == "cheese" )
t2: Topping( pizza == p, name == "sausage" )
t3: Topping( pizza == p, name == "pepperoni" )
t4: Topping( pizza == p, name == "pepper" )
then
System.out.println( "Eating cheese sausage pepperoni pepper pizza" );
retract( t4 );
retract( t3 );
retract( t2 );
retract( t1 );
retract( p );
end
See the attached project.
--- On Tue, 9/1/09, Bill Tarr <javatestcase(a)yahoo.com> wrote:
> From: Bill Tarr <javatestcase(a)yahoo.com>
> Subject: [rules-users] Trouble getting Dynamic Salience working
> To: rules-users(a)lists.jboss.org
> Date: Tuesday, September 1, 2009, 7:28 PM
> We have a winner! Many thanks
> Michal, hope I can return the favor one day.
>
> salience ( return getSalience4() )
>
> for the record, my function looks something like (after
> tempate evaluation):
>
> <pre>
> function int getSalience4(){
> int salience = 0;
> if("VALUE"=="VALUE") salience += 1000;
>
> return salience;
> }
> </pre>
>
> I think the combination activation-group and dynamic
> salience for rule-template projects are pretty useful.
>
> Just for anyone interested, the tempate code looks
> something like this:
>
> <pre>
> rule "Some Rule_(a){row.rowNumber}"
>
> activation-group "@{PARAM1}-@{PARAM2}"
> salience ( return getSalience(a){row.rowNumber}() )
> </pre>
>
> where PARAM1 and PARAM2 make up a kind of key. I only want
> to execute one rule that matches that key, no matter how
> many options there are.
>
> Rules that have additional parameters get higher salience
> than rules with less parameters, so here is my function.
>
> <pre>
> function int getSalience(a){row.rowNumber}(){
> int salience = 0;
> if("@{PARAM3}"=="@{PARAM3}") salience += 1000;
> if("@{PARAM4}"=="@{PARAM4}") salience += 1000;
> return salience;
> }
> </pre>
>
> A concrete example could be pizza. So there are 3 types
> of pizza, all are grouped in the same activation-group.
>
> cheese, pepperoni
> cheese, pepperoni, sausage
> cheese, pepperoni, meatball, pepper
>
> Any cheese and pepperoni pizza should could match all these
> rules, but more toppings is always better for me.
>
> So cheese, pepperoni, onion, pepper getts a salience of
> 2000, and is the only rule evaluated.
>
>
>
> On Tue Sep 1 18:39:13 EDT 2009, Michal Bali michalbali at
> gmail.com wrote:
>
> does this work?
> salience ( return getSalience() )
>
> or this:
>
> salience ( getSalience();)
>
>
> On Tue, Sep 1, 2009 at 6:50 PM, Bill Tarr <javatestcase
> at yahoo.com> wrote:
>
> > Possibily just a simple MVEL error, but I've been
> struggling for a while
> > and thought I'd see if anyone could help.
> >
> > I just want to run a logic test to determine salience
> for some rules I am
> > generating with rules-templates. Even after making
> the logical test "true"
> > I can't get any of variation to compile.
> >
> > (true ? "1000" : "0")
> > **produces**
> > Unable to build expression for 'salience' : not a
> statement, or badly
> > formed structure
> >
> > ( true ? 1000 : 0)
> > **produces**
> > Unable to build expression for 'salience' : invalid
> number literal: 1000
> >
> > salience ( getSalience() )
> > ...
> > function int getSalience(){return 0;}
> > **produces**
> > Unable to build expression for 'salience' :
> org.mvel2.util.MethodStub
> > cannot be cast to java.lang.Class'(
> getSalienceNONCDW() )'
> >
> > Seems like I am missing something simple, but I've
> tried many variations on
> > the above, and have been unable to find any working
> examples of using a
> > logical test in salience, so if anyone has any
> direction it would be greatly
> > appreciated.
> >
> > Thanks!
> >
> > Bill
>
>
>
>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
16 years, 8 months
Drools Expert API
by Swapnil Raverkar
Hi All,
I am a newbie and just started using Drools 5.
My question is that why there is no documentation provided for classes such
as *org.drools.compiler.PackageBuilder*, *org.drools.RuleBase* which are
part of Drools Expert in the main Javadocs ?
Or the javadocs are only for Drools API?
Cheers,
Swapnil
16 years, 8 months
AgendaGroup Focus
by Chandana Pingle
Hi all,
How do i check if an agenda group has the focus from my java test class
Thanks
chandana
16 years, 8 months
Trouble getting Dynamic Salience working
by Bill Tarr
We have a winner! Many thanks Michal, hope I can return the favor one day.
salience ( return getSalience4() )
for the record, my function looks something like (after tempate evaluation):
<pre>
function int getSalience4(){
int salience = 0;
if("VALUE"=="VALUE") salience += 1000;
return salience;
}
</pre>
I think the combination activation-group and dynamic salience for rule-template projects are pretty useful.
Just for anyone interested, the tempate code looks something like this:
<pre>
rule "Some Rule_(a){row.rowNumber}"
activation-group "@{PARAM1}-@{PARAM2}"
salience ( return getSalience(a){row.rowNumber}() )
</pre>
where PARAM1 and PARAM2 make up a kind of key. I only want to execute one rule that matches that key, no matter how many options there are.
Rules that have additional parameters get higher salience than rules with less parameters, so here is my function.
<pre>
function int getSalience(a){row.rowNumber}(){
int salience = 0;
if("@{PARAM3}"=="@{PARAM3}") salience += 1000;
if("@{PARAM4}"=="@{PARAM4}") salience += 1000;
return salience;
}
</pre>
A concrete example could be pizza. So there are 3 types of pizza, all are grouped in the same activation-group.
cheese, pepperoni
cheese, pepperoni, sausage
cheese, pepperoni, meatball, pepper
Any cheese and pepperoni pizza should could match all these rules, but more toppings is always better for me.
So cheese, pepperoni, onion, pepper getts a salience of 2000, and is the only rule evaluated.
On Tue Sep 1 18:39:13 EDT 2009, Michal Bali michalbali at gmail.com wrote:
does this work?
salience ( return getSalience() )
or this:
salience ( getSalience();)
On Tue, Sep 1, 2009 at 6:50 PM, Bill Tarr <javatestcase at yahoo.com> wrote:
> Possibily just a simple MVEL error, but I've been struggling for a while
> and thought I'd see if anyone could help.
>
> I just want to run a logic test to determine salience for some rules I am
> generating with rules-templates. Even after making the logical test "true"
> I can't get any of variation to compile.
>
> (true ? "1000" : "0")
> **produces**
> Unable to build expression for 'salience' : not a statement, or badly
> formed structure
>
> ( true ? 1000 : 0)
> **produces**
> Unable to build expression for 'salience' : invalid number literal: 1000
>
> salience ( getSalience() )
> ...
> function int getSalience(){return 0;}
> **produces**
> Unable to build expression for 'salience' : org.mvel2.util.MethodStub
> cannot be cast to java.lang.Class'( getSalienceNONCDW() )'
>
> Seems like I am missing something simple, but I've tried many variations on
> the above, and have been unable to find any working examples of using a
> logical test in salience, so if anyone has any direction it would be greatly
> appreciated.
>
> Thanks!
>
> Bill
16 years, 8 months
Trouble getting Dynamic Salience working
by Bill Tarr
Possibily just a simple MVEL error, but I've been struggling for a while and thought I'd see if anyone could help.
I just want to run a logic test to determine salience for some rules I am generating with rules-templates. Even after making the logical test "true" I can't get any of variation to compile.
(true ? "1000" : "0")
**produces**
Unable to build expression for 'salience' : not a statement, or badly formed structure
( true ? 1000 : 0)
**produces**
Unable to build expression for 'salience' : invalid number literal: 1000
salience ( getSalience() )
...
function int getSalience(){return 0;}
**produces**
Unable to build expression for 'salience' : org.mvel2.util.MethodStub cannot be cast to java.lang.Class'( getSalienceNONCDW() )'
Seems like I am missing something simple, but I've tried many variations on the above, and have been unable to find any working examples of using a logical test in salience, so if anyone has any direction it would be greatly appreciated.
Thanks!
Bill
16 years, 8 months
Re: [rules-users] Why so many ACTIVATION/DEACTIVATION events?
by Tom.E.Murphy＠wellsfargo.com
Thanks for the reply, Wolfgang.
If I understand your scenario correctly, I think you are describing the expected activation patterns during the firing of this rule. I agree with your description, and our logs show something very similar.
Responding to your specific suggestions -
1. The data model is a given - we have no control over it.
2. No-loop true is used on all our rules, including this one. In the example, I had removed rule attributes for brevity.
3. Unfortunately, the data semantics are also not under our control, and the rule has to test all these objects in order to work right.
Further diagnosis indicates that what looked like multi-activated rules are actually not all the same rule instance, even though their content is the same - the log4j appender being used was improperly trimming the ends of the distinguishing identifiers when it logged them. However, although these rules are different instances of the rule, their conditions are identical, so I'm still puzzled why a set of conditions that are not met in the data will lead to an activation / deactivation. I'm going to have to dig deeper, I guess.
Thanks.
Tom Murphy
Business Process Consultant
Wells Fargo HCFG - CORE Deal Decisioning Platform
800 S. Jordan Creek Parkway | West Des Moines, IA 50266
MAC: X2301-01B
Office: 515 324 4853 | Mobile: 941 320 8014
This message may contain confidential and/or privileged information. If you are not the addressee or authorized to receive this for the addressee, you must not use, copy, disclose, or take any action based on this message or any information herein. If you have received this message in error, please advise the sender immediately by reply e-mail and delete this message. Thank you for your cooperation.
Date: Tue, 1 Sep 2009 08:04:46 +0200
From: Wolfgang Laun <wolfgang.laun(a)gmail.com>
Subject: Re: [rules-users] Why so many ACTIVATION/DEACTIVATION events?
To: Rules Users List <rules-users(a)lists.jboss.org>
Message-ID:
<17de7ee80908312304y52499c00m88f3a45c6b225825(a)mail.gmail.com>
Content-Type: text/plain; charset="windows-1252"
Hi Tom,
your understanding of "Activation" is fine, so let's see what happens if
your rule "RS..." fires. (I'm abbreviating names.)
Initially, neither PolSet nor PolSetId are there, so "RS..." activation #1
is on the agenda, fires and executes the consequence.
Now, PolSet is created and inserted as a new fact. This causes reevaluation
of all rules, including "RS..." (with its activation #1 still executing).
The not(PolSet and PolSetId) is still true, and therefore the LHS yields
true, and "RS..." activation #2 is put on the agenda. Continuing with #1,
PolSetId is created and inserted, causing reevaluations of all rules. Now
the not(PolSet and PolSetId) is false, so that "RS..." #2 is removed again.
As for a remedy, you might consider several approaches. Notice that I have
to guess what else might be going on, so I could be way off with (3), for
instance.
(1) Is it really necessary to have PolSet and PolSetId as two separate
facts? (It might still be possible to have PolSet as an *object* for
establishing linkage to the parental TransDet, without being a *fact*.)
(2) Add the rule attribute no-loop true to "RS..."
(3) If the absences of PolSetId alone is sufficient for triggering the
rule(s), omit PolSet from rule "RS..." and add another rule which creates
the "missing link" when you have a TransDet, the existence of at least one
PolSetId and no matching PolSet, to create the latter.
Cheers
-W
2009/9/1 <Tom.E.Murphy(a)wellsfargo.com>
> We have a fairly complex object model, but we?re still puzzled ? I
> thought that the definition of ?Activation? was that the data matched on all
> conditions of a rule, and therefore the rule was entered into the agenda
> (activated).
> If that is true, I cannot figure out why we?re experiencing this.
> As our number of rules increases, we?re seeing exponential increases in
> repetitive activation/deactivation pairs, even on rules where we know the
> data does not match the conditions.
>
> Example:
> The following rule (abbreviated here) creates an object of type PolicySet
> if there are none that match the conditions.
> I would expect this rule to activate once, then fire, wherein the matching
> PolicySet is created, and then never activate again since the absence of a
> matching PolicySet object is never again true.
> However, in a rule base of ~4,000 rules, we see this rule activating 975
> times and deactivating 975 times. This is just one example ? nearly all our
> rules do this, and it is seriously impacting decisioning performance.
>
> Have I misunderstood the meaning of ?activation?? Can anyone help me
> understand this?
>
> rule "RS6090.1.12_RF7007_50001012"
> when
> LendingProduct ( $exitStrategyType1 : exitStrategyType )
> Features ( $lienPriority1 : lienPriority )
> DecisionResultsInfo ( $dealRiskCategory1 : dealRiskCategory
> )
> TransactionDetail ( $parentTransactionDetail1Id : myId )
> not
> (
> PolicySet ( $parentPolicySet_1_Id : myId, parentId
> == $parentTransactionDetail1Id )
> and
> PolicySetIdentifier ( parentId ==
> $parentPolicySet_1_Id
> , lienPriority == $lienPriority1
> , exitStrategyType == $exitStrategyType1
> , dealRiskCategory == $dealRiskCategory1)
> )
> then
> // Content removed? rule creates the policy set and the
> policy set identifier, and initializes all appropriate elements
> // After doing so, why does it activate/deactivate 1800+
> times in a rule base of 4000 rules?
> System.out.println("6090 fired.");
> End
>
> Thanks.
> *Tom Murphy
> **Business Process Consultant
> Wells Fargo HCFG - CORE Deal Decisioning Platform
> 800 S. Jordan Creek Parkway | West Des Moines, IA 50266
> MAC: **X2301-01B
> **Office: **515 324 4853** | Mobile: 941 320 8014
> **This message may contain confidential and/or privileged information. If
> you are not the addressee or authorized to receive this for the addressee,
> you must not use, copy, disclose, or take any action based on this message
> or any information herein. If you have received this message in error,
> please advise the sender immediately by reply e-mail and delete this
> message. Thank you for your cooperation.*
>
>
>
>
16 years, 8 months
