Re: [rules-users] Trouble getting Dynamic Salience working
Just a quick observance, but this is also an excellent example of
subsumption of rules (almost). The first rule conditions elements are
all contained in the second rule. However, the action items are
different. Therefore the first rule should say that the topping does
not contain sausage nor pepperoni... Or, the objects could be written
so that there would be something to flag a cheese-only pizza otherwise
both rules would fire as written. :-(
SDG
James Owen
Founder October Rules Fest
Senior Consultant / Architect KBSC
http://www.kbsc.com
http://www.OctoberRulesFest.org
Twitter: OctRulesFest
Blogs:
http://JavaRules.blogspot.com [Rulebased Systems Blog]
http://ORF2009.blogspot.com [October Rules Fest Blog]
http://exscg.blogspot.com/ [Expert Systems Consulting Group Blog]
If I have seen a little further it is by standing on the shoulders of
giants.
Sir Isaac Newton in a letter to Robert Hooke, 5 Feb 1676
Come to October Rules Fest and stand on the shoulders of the Giants of
the industry; if only for a week.
On Sep 1, 2009, at 9:29 PM, Greg Barton wrote:
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 javatestc...@yahoo.com wrote:
From: Bill Tarr javatestc...@yahoo.com
Subject: [rules-users] Trouble getting Dynamic Salience working
To: rules-users@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 ru...@{row.rownumber}
activation-group @{param...@{param2}
salience ( return getsalie...@{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 getsalie...@{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
[rules-users] DRools 5 with spring 2.5.6
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. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] question on drools and method calls on facts
It depends whether you are a purist, a pragmatist, or a maverick. A few random thoughts, and note that I consider myself a repenting pragmatist ;-) Having fact classes with methods that modify the object in addition to the usual setters is dangerous; a toString() according to the convention is harmless. Even from a purist's point of view your list could be extended by calls of methods to global objects, e.g., for communicating results to some GUI or whatever. What is usually frowned at it the use of conditional statements on the RHS as going against the spirit of rule based programming. If complex processing is required, hide it in some static methods of an utility class. It will make your rule code trimmer and slimmer, avoiding needless binding between the business logic part and implementation details. -W On Tue, Sep 1, 2009 at 11:02 PM, Garner, Shawn garner.sh...@principal.comwrote: 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 -Message Disclaimer- This e-mail message is intended only for the use of the individual or entity to which it is addressed, and may contain information that is privileged, confidential and exempt from disclosure under applicable law. If you are not the intended recipient, any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by reply email to conn...@principal.com and delete or destroy all copies of the original message and attachments thereto. Email sent to or from the Principal Financial Group or any of its member companies may be retained as required by law or regulation. Nothing in this message is intended to constitute an Electronic signature for purposes of the Uniform Electronic Transactions Act (UETA) or the Electronic Signatures in Global and National Commerce Act (E-Sign) unless a specific statement to the contrary is included in this message. While this communication may be used to promote or market a transaction or an idea that is discussed in the publication, it is intended to provide general information about the subject matter covered and is provided with the understanding that The Principal is not rendering legal, accounting, or tax advice. It is not a marketed opinion and may not be used to avoid penalties under the Internal Revenue Code. You should consult with appropriate counsel or other advisors on all matters pertaining to legal, tax, or accounting obligations and requirements. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] When MinaTaskClient.complete throw NullPointerException
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) ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] Trouble getting Dynamic Salience working - add in rules-templates
Thank you for the response Greg. For starters, I did NOT know about
specificity... very helpful to know, and I feel certain I will be using it in
the future. I don't feel any of the documentation I've read on Drools really
got this subject across for me, I not sure the the Drools developer book really
covers it at all.
Back to my actual implementation. We are using rules-templates, which have a
unique behavior I've been calling a feature, but some might consider a bug...
or have found a way to work around. Templates do not render rule lines which
contains NULL parameters. This hasn't bit my too badly to this point, but MAY
pose an interesting issue for specificity (now that I know about it!)
My real world example is a good bit more complicated. My LH includes:
PARAMETERS
--
Product - NOT NULL
Start Date
End State
Price Group - NOT NULL
State Group
Some of the info is coming from a single instance of an object I'm calling
transporter I use to gather info from other rules. It will have a list of
state groups and price groups. So psuedocode for my template LH will look
something like:
template.pricegroups.contains( @{PRICE_GROUP} )
template.stategroups.contains( @{STATE_GROUP} )
policy (
startDate @{START_DATE}
endDate @{END_DATE}
product = @{PRODUCT}
)
The problem I run into here, is that in any given rule, only a subset of these
will appear. So one rule may produce:
// this rules parameters have a NULL STATE_GROUP
template.pricegroups.contains( pg1 )
policy (
startDate 2009-01-01
endDate 2010-01-10}
product = prod1
)
and another might produce
// this rule has a STATE_GROUP, but no START_DATE and END_DATE
template.pricegroups.contains( pg1 )
template.stategroups.contains( NY )
policy (
product = prod2
)
In this example, I actually want the SECOND rule to win the conflict. It is
more specific for our business rule, a policy for NY should match, but
the the first rule should not. In reality, the first rule has more facts, so
which one will actually fire first by rules of specificity?
My activation-group and salience hack was one workaround for this condition. I
set the second rule with a higher salience, and add them both to the same
activation-group.
I will try different combinations of rule-templates and specificity when I am
in the office tomorrow (midnight here in San Diego.) If you have any further
feedback on this, I do appreciate your taking the time to show a Drools newbie
some very useful stuff.
Thanks!
Bill
Message: 2
Date: Tue, 1 Sep 2009 19:29:40 -0700 (PDT)
From: Greg Barton greg_bar...@yahoo.com
Subject: Re: [rules-users] Trouble getting Dynamic Salience working
To: Rules Users List rules-users@lists.jboss.org
Message-ID: 52492.42683...@web81501.mail.mud.yahoo.com
Content-Type: text/plain; charset=iso-8859-1
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 javatestc...@yahoo.com wrote:
From: Bill Tarr javatestc...@yahoo.com
Subject: [rules-users] Trouble getting Dynamic Salience working
To: rules-users@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 ru...@{row.rownumber}
??? activation-group @{param...@{param2}
??? salience ( return getsalie...@{row.rownumber}() )
/pre
where PARAM1 and
[rules-users] KnowledgeAgent with BRL Files
Hi! I did a lot of searching aroung the web, drools doc and this mailing list but could not solve my problem. I want to monitor a folder for BRL File so i used the Agent. Java Code: KnowledgeAgent kbAgent = KnowledgeAgentFactory.newKnowledgeAgent(kbAgent); Resource resource = ResourceFactory.newUrlResource(ChangeSet.xml); kbAgent.applyChangeSet(resource); ResourceFactory.getResourceChangeNotifierService().start(); ResourceFactory.getResourceChangeScannerService().start(); ChangeSet.xml: change-set add resource source='file:/Z:/rules' type='BRL' / /add /change-set Result: When i execute the code, the agent starts up, finds the brl file in the folder and parses them. But: * It tries to parse the drools.package file with the imports for the brl files as BRL file as well * So i tried to work around and tweaked the implementation of KnowledgeAgentImpl, so it skips the drools.package file when scanning the folder for brl files. But now i get: com.thoughtworks.xstream.io.StreamException: : Content is not allowed in prolog. plus [Fatal Error] :1:1: Content is not allowed in prolog. in the console. As far as i could trace the error, the problem is that the imports are not added to the internally generated drl (package). So how do i use the agent properly to use brl files? Any ideas on this? Thank you for reading, Dave -- === This mail account will accept only Mails from jboss mailing lists. If you like to send me an email, delete the .drools_user_list in the sender address. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] how to use 'extend' keyword in Rule Engine
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 LT Infotech Ltd Mumbai Ph: +919820283884 Larsen Toubro Infotech Ltd. www.Lntinfotech.com This Document is classified as: LT Infotech Proprietary LT Infotech Confidential LT Infotech Internal Use Only LT Infotech General Business This Email may contain confidential or privileged information for the intended recipient (s) If you are not the intended recipient, please do not use or disseminate the information, notify the sender and delete it from your system. _ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Maven Plugin to build pkg files
Hi Eric. Thanks for the answer. Basically I developed that code yesterday, yes. I did it somehow similar to the Ant Task. But I had some serious serialization issues as posted yesterday. Maybe you have an idea about that? If one doesnt exist and theres enough interest, we could use what I have as a starting point as an open source plugin for it. You mean in the drools codebase? Basically, yes, sure. Should be no problem to contribute it. Just tell me how to progress in that area. Cheers Bernd Von: rules-users-boun...@lists.jboss.org [mailto:rules-users-boun...@lists.jboss.org] Im Auftrag von Miles, Eric Gesendet: Mittwoch, 2. September 2009 14:27 An: Rules Users List Betreff: Re: [rules-users] Maven Plugin to build pkg files Bernd, Something didnt exist as of Drools 4.x (at least nothing official). With the latest release of Drools, the amount of code needed to be written to compile is actually pretty small. Making a Maven plugin would not be that difficult. Ive made one that is just a couple of hundred lines long and most of that is the Maven framework glue. If one doesnt exist and theres enough interest, we could use what I have as a starting point as an open source plugin for it. Eric _ From: rules-users-boun...@lists.jboss.org [mailto:rules-users-boun...@lists.jboss.org] On Behalf Of Bernd Rücker Sent: Monday, August 31, 2009 10:57 AM To: rules-users@lists.jboss.org Subject: [rules-users] Maven Plugin to build pkg files Hi all. I wonder if there exists a maven plugin to build pkg files out of the rule base during the maven packaging. Because we dont use the Guvnor repository in this project and I want to package the pkg files with the overall ear. I searched a bit, but didnt found anything Okay, not hard to write ourself, but would be nicer to reuse existing stuff Thanks Bernd ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] When MinaTaskClient.complete throw NullPointerException
When using the human task service in combination with JPA, you should use the CommandBasedWSHumanTaskHandler, not the default WSHumanTaskHandler: http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-process/drools-process-task/src/main/java/org/drools/process/workitem/wsht/CommandBasedWSHumanTaskHandler.java The reason is that in that case, the completion of a human task should also be executed as part of a JPA transaction, hence the slightly modified handler. Kris Quoting liuzhikun liuzhi...@viewhigh.com.cn: 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) Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] forall/from/eval/contains: odd DRL syntax error
A rule has to ascertain that all elements in a ListElemBoxStatusin a Collector occur in the matching BoxResponse's SetElemBoxStatus. There is just one BoxResponse per Collector. This here works fine: rule matchCollectorResponse when $c : Collector( $ebsList : elemBoxStatusList, $gsSet : globalStatusSet ) $b : BoxResponse( collector == $c, globalStatusSet == $gsSet, $ebsSet : elemBoxStatusSet ) forall( $ebs : ElemBoxStatus() from $ebsList BoxResponse( collector == $c, elemBoxStatusSet contains $ebs ) ) then ... end Thinking that $ebs is already available from the second pattern ($b:...), I tried rule matchCollectorResponse when $c : Collector( $ms : message, $ebsList : elemBoxStatusList, $gsSet : globalStatusSet ) $b : BoxResponse( collector == $c, globalStatusSet == $gsSet, $ebsSet : elemBoxStatusSet ) forall( $ebs : ElemBoxStatus() from $ebsList eval( $ebsSet.contains( $ebs ) ) ) then ... end but the compiler came back with Line ...:55 no viable alternative at input '$ebs' in rule matchCollectorResponse in pattern eval Defining a suitable function isIn(...) and using this within eval() produces the same result. This and other experiments seems to indicate that bindings in the first pattern of forall() are not passed in to an eval() later in the forall. JIRA? -W ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] question on drools and method calls on facts
I have to disagree on one point. Having fact classes with methods that modify the object in addition to the usual setters is not dangerous, it's called encapsulation or information hiding and is a common OO pattern. Now, in the rules context, you have to inform the engine that the object has changed, but that's necessary when you call a setter as well. In fact I think it's an advantage of Drools that you can use pojos in working memory and take advantage of OO design. --- On Wed, 9/2/09, Wolfgang Laun wolfgang.l...@gmail.com wrote: From: Wolfgang Laun wolfgang.l...@gmail.com Subject: Re: [rules-users] question on drools and method calls on facts To: Rules Users List rules-users@lists.jboss.org Date: Wednesday, September 2, 2009, 1:30 AM It depends whether you are a purist, a pragmatist, or a maverick. A few random thoughts, and note that I consider myself a repenting pragmatist ;-) Having fact classes with methods that modify the object in addition to the usual setters is dangerous; a toString() according to the convention is harmless. Even from a purist's point of view your list could be extended by calls of methods to global objects, e.g., for communicating results to some GUI or whatever. What is usually frowned at it the use of conditional statements on the RHS as going against the spirit of rule based programming. If complex processing is required, hide it in some static methods of an utility class. It will make your rule code trimmer and slimmer, avoiding needless binding between the business logic part and implementation details. -W On Tue, Sep 1, 2009 at 11:02 PM, Garner, Shawn garner.sh...@principal.com wrote: 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 -Message Disclaimer- This e-mail message is intended only for the use of the individual or entity to which it is addressed, and may contain information that is privileged, confidential and exempt from disclosure under applicable law. If you are not the intended recipient, any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by reply email to conn...@principal.com and delete or destroy all copies of the original message and attachments thereto. Email sent to or from the Principal Financial Group or any of its member companies may be retained as required by law or regulation. Nothing in this message is intended to constitute an Electronic signature for purposes of the Uniform Electronic Transactions Act (UETA) or the Electronic Signatures in Global and National Commerce Act (E-Sign) unless a specific statement to the contrary is included in this message. While this communication may be used to promote or market a transaction or an idea that is discussed in the publication, it is intended to provide general information about the subject matter covered and is provided with the understanding that The Principal is not rendering legal, accounting, or tax advice. It is not a marketed opinion and may not be used to avoid penalties under the Internal Revenue Code. You should consult with appropriate counsel or other advisors on all matters pertaining to legal, tax, or accounting obligations and requirements. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -Inline Attachment Follows- ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] forall/from/eval/contains: odd DRL syntax error
Is Collection.containsAll() an option? --- On Wed, 9/2/09, Wolfgang Laun wolfgang.l...@gmail.com wrote: From: Wolfgang Laun wolfgang.l...@gmail.com Subject: [rules-users] forall/from/eval/contains: odd DRL syntax error To: Rules Users List rules-users@lists.jboss.org Date: Wednesday, September 2, 2009, 9:58 AM A rule has to ascertain that all elements in a ListElemBoxStatusin a Collector occur in the matching BoxResponse's SetElemBoxStatus. There is just one BoxResponse per Collector. This here works fine: rule matchCollectorResponse when $c : Collector( $ebsList : elemBoxStatusList, $gsSet : globalStatusSet ) $b : BoxResponse( collector == $c, globalStatusSet == $gsSet, $ebsSet : elemBoxStatusSet ) forall( $ebs : ElemBoxStatus() from $ebsList BoxResponse( collector == $c, elemBoxStatusSet contains $ebs ) ) then ... end Thinking that $ebs is already available from the second pattern ($b:...), I tried rule matchCollectorResponse when $c : Collector( $ms : message, $ebsList : elemBoxStatusList, $gsSet : globalStatusSet ) $b : BoxResponse( collector == $c, globalStatusSet == $gsSet, $ebsSet : elemBoxStatusSet ) forall( $ebs : ElemBoxStatus() from $ebsList eval( $ebsSet.contains( $ebs ) ) ) then ... end but the compiler came back with Line ...:55 no viable alternative at input '$ebs' in rule matchCollectorResponse in pattern eval Defining a suitable function isIn(...) and using this within eval() produces the same result. This and other experiments seems to indicate that bindings in the first pattern of forall() are not passed in to an eval() later in the forall. JIRA? -W -Inline Attachment Follows- ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] Doubt regarding extend keyword in Rule Engine
Hi Users,Please help me to clear my doubt of using 'extend' keyword in Rules.I tried using this keyword to use the condition of rule 1 in rule 2 asRule "first rule" when condition then actionRule "second rule" extends "first rule"when condition then actionBut whenI tried to use it,it gives meerror for compilation error in drool file.Kindly help me over this, If I am wrongly using the keyword as I have not found anything about it in Rule engine documentation. Thanks RegardsPardeep RuhilThis email may contain confidential or privileged information for the intended recipient(s). If you are not the intended recipient please do not use or disseminate the information notify the sender and delete it from your system. Thanks __ ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] Drools as Lexer / Parser (sequential data processing)
Hello group, I recently had the idea:
A rule system (like Drools) is ideal for making programs with complex
rules simpler. Writing a lexer or parser can be non-trivial. So, is it
possible and also meaningful to express such a task with rules?
Anyone here who maybe tried that already?
The two big questions for me are:
1) how easy is it to express a lexer with rules?
2) how bad (good?) will it perform?
If you happen to have a good idea of how to do it, could you please give
me an example for a simple lexer?
Let's say it will get natural language (a string, such as this email) as
input and should return a sequence (say, ArrayList) of Tokens, which may
look like this:
public class Token {
public String value;
public String category;
Token(String value, String category) {
this.value = value;
this.category = category;
}
}
We could have three categories:
word, numeric and whitespace.
An input String could be:
We can see 500 cars
And it should produce an ArrayList with the contents:
[
Token(We, word),
Token( , whitespace),
Token(can, word),
Token( , whitespace),
Token(see, word),
Token( , whitespace),
Token(500, numeric),
Token( , whitespace),
Token(cars, word)
]
At the moment I have difficulties to see if/how this could be achieved.
If you find this easy, please post a solution.
I am aware that JavaCC is really good for such tasks and will also
perform extremly well.
Greetings,
André
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[rules-users] Scaling to large numbers of rules
I am hoping that I am doing something wrong here and that one of you can point me in the right direction. Can anyone provide some advice on scaling up the number of rules in a single KnowledgeBase? While I have seen all sorts of reports on having lots of facts, I have not seen anything about having lots of rules. I need to get to about 200K rules in a single KnowledgeBase, and also to run several of these side by side in the same system. The problem: As the number of rules increases, the time to compile and load them into memory skyrockets. Now while I realize that the Rete algorithm complexity is about the number of rules, the times I am seeing are pretty scary. Also, at about 30k rules, things just fall apart. On a 64 bit Linux OS with 2 2.4Ghz processors using a 64bit JVM from OpenJDK (1.6.1) with 1 Gig of memory allocated to the JVM, loading from .drl files: 1000 rules: KnowledgeBuilder.add: 7 seconds KnowledgeBase.addKnowledgePackages: .8 seconds 1 rules: KnowledgeBuilder.add: 79 seconds KnowledgeBase.addKnowledgePackages: 23 seconds 15000 rules: KnowledgeBuilder.add: 138 seconds KnowledgeBase.addKnowledgePackages: 55 seconds 2 rules: KnowledgeBuilder.add: 488 seconds KnowledgeBase.addKnowledgePackages: 100 seconds 3 rules: KnowledgeBuilder.add: out of memory KnowledgeBase.addKnowledgePackages: never runs At this rate, 200k rules will take 13-14 hours to compile and 2-3 hours to load into RAM, assuming I can even get to that many rules. This just is not usable. Time to fire all rules is negligible (fortunately!). The rules I am testing on are very simple 1-3 variable equality whens with a simple System.out.println then clause. The benchmark code I am running is as follows: KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase(); KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(); kbuilder.add( ResourceFactory.newClassPathResource( drlFile, RuleRunner.class ), ResourceType.DRL ); CollectionKnowledgePackage pkgs = kbuilder.getKnowledgePackages(); kbase.addKnowledgePackages( pkgs ); Sample rule: rule 0005 - random rule when Transaction(someId == 35156 someOtherId == '79F81FB8134A129F' someCollection contains 'EC3F2A1DCA88') then System.out.println(match rule 0005 - random rule); end Any help would be appreciated. Regards, Adam Sussman CONFIDENTIALITY NOTICE: This message contains information which may be confidential or privileged. If you are not the intended recipient, be aware that any disclosure, copying, distribution or use of the contents of this information is prohibited. If you have received this transmission in error, please notify me immediately by telephone. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] not able to debug drools flow
Hi, I'm afraid I downloaded the new plugin from the link you have and it still wont allow me to debug on eclipse 3.5. Anyone else had any luck? Cheers, Justin On Thu, Aug 27, 2009 at 11:05 PM, Kris Verlaenen kris.verlae...@cs.kuleuven.be wrote: Ok, sorry, it took me a while but I found the issue. The code works fine for both Eclipse 3.4.x and 3.5.x, but apparently there is an issue when you build the plugin for 3.4.x and try to use that in 3.5.x. I managed to work around the problem and the fix is committed on trunk. You can download the latest version of the plugin here: https://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/trunk/target/ Kris Quoting Justin King justin.matthew.k...@gmail.com: I'm also using eclipse galileo, Java 1.5, and XP SP3 and I'm having the same problem 2009/8/24 Jakob Marovt jmar...@gmail.com Hi, I am using Eclipse 3.5.0, jdk 1.6.0_13-b03 and Drools 5.0 all on Windows XP Professional SP3. Jakob On Sat, Aug 22, 2009 at 11:47 PM, Kris Verlaenen kris.verlae...@cs.kuleuven.be wrote: I just tried using Eclipse 3.5.0, jdk 1.6.0_06 and the latest Drools 5.1.0.SNAPSHOT on RHEL and everything seems to be working fine ... Could you specify the exact environment you are getting this error in, so I can at least try to reproduce? Kris Quoting Maximiliano Batelli maxibate...@gmail.com: Hello I have the same problem when debuging rules using eclipse 3.5, drools 5.0 and jdk 1.6. I downgraded to eclipse 3.4 and worked for me. Is there a solution to let me debug using eclipse 3.5? Thanks Max Hi, I`m experiencing the same problems as Vishal. I am using Eclipse 3.5 and newest Drools. I am only able to debug project as Java application, but when I want to debug it as Drools application all I get is this problem. I also tried disabling firewall and changing its settings but as it seems it does not help. So if anyone has figured out a solution to this problem, I would really appreciate an answer. Thanks, Jakob probably related to your personal firewall: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6303969 http://www.techienuggets.com/Comments?tx=3786 I don't think this is a Drools specific issue. Mark Vishal Anand wrote: *** Hi,* *** * *** I am using Drools 5.0 and have create a simple application using * * drools flow, it runs perfectly but when trying to debug it as n drools * * application I get the following error:* *** * *** FATAL ERROR in native method: JDWP No transports initialized, * * jvmtiError=AGENT_ERROR_TRANSPORT_INIT(197)* *** ERROR: transport error 202: connect failed: Connection refused* *** ERROR: JDWP Transport dt_socket failed to initialize, TRANSPORT_INIT(510)* *** JDWP exit error AGENT_ERROR_TRANSPORT_INIT(197): No transports * * initialized [../../../src/share/back/debugInit.c:690]* *** * *** * *** While stack trace shows the following:* *** * *** * *** java.lang.IncompatibleClassChangeError: Expected static method * *org.drools.eclipse.launching.DroolsVMDebugger.renderCommandLine([Ljava/lang/String;)Ljava/lang/String; * *** at org.drools.eclipse.launching.DroolsVMDebugger.run(Unknown Source)* *** at * *org.eclipse.jdt.launching.JavaLaunchDelegate.launch(JavaLaunchDelegate.java:101) * *** at * *org.drools.eclipse.launching.DroolsLaunchConfigurationDelegate.launch(Unknown * * Source)* *** at * *org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:853) * *** at * *org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:703) * *** at * *org.eclipse.debug.internal.ui.DebugUIPlugin.buildAndLaunch(DebugUIPlugin.java:866) * *** at * *org.eclipse.debug.internal.ui.DebugUIPlugin$8.run(DebugUIPlugin.java:1069) * *** at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)* *** * *** * *** I am using eclipse 3.4* *** * *** What could be the issue ?* *** * *** Thanks* *** Vishal* ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] immediate vs path bound variables wrt performance?
The docs state that == with bound variables is very fast due to hashing. The example only shows a simple bound value, eg Person( likes : favouriteCheese ) Cheese( type == likes ) In the following will drools create an implicit hashed variable for '$p.likes' and yield the same performance? $p : Person( ) Cheese( type == $p.likes ) -- View this message in context: http://www.nabble.com/immediate-vs-path-bound-variables-wrt-performance--tp25269900p25269900.html Sent from the drools - user mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] immediate vs path bound variables wrt performance?
Ok, I think I just found my answer, from 4.8.2.1 'Note: Nested accessors have a much greater performance cost than direct field accesses, so use them carefully. But is the simple case in the previous post considered nested? -- View this message in context: http://www.nabble.com/immediate-vs-path-bound-variables-wrt-performance--tp25269900p25269967.html Sent from the drools - user mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
