Re: [rules-users] Perfromance issues and memory leaks in Drools (Edson Tirelli)
Hi Edson, Thanks for the information. But now I want to ask you one thing. I have seen your post. The problem in application is mainly usage of memory You posted that Match 30,2010. I downloaded Drools 5.0 on August 2009 and I am using that. SO this True modify algorithm is implemented in Drools 5.1 only or it is even available in latest Drools 5.0 If I use Drools 5.1 then Whether I will get any advantage. In application we are using Rules Template ,Rule Flows and drls. When I am calling Rules from Java then it is taking more time compared to calling Java method from rules. In addition to this can u suggest me how to write better rules Query. I am using very simple way of writing Rules Query like :- When Abc : ABC(condition==A) Then Call method End; Thanks Regards, Nikhil S. Kulkarni -Original Message- From: rules-users-boun...@lists.jboss.org [mailto:rules-users-boun...@lists.jboss.org] On Behalf Of rules-users-requ...@lists.jboss.org Sent: Friday, September 17, 2010 9:30 PM To: rules-users@lists.jboss.org Subject: rules-users Digest, Vol 46, Issue 58 Send rules-users mailing list submissions to rules-users@lists.jboss.org To subscribe or unsubscribe via the World Wide Web, visit https://lists.jboss.org/mailman/listinfo/rules-users or, via email, send a message with subject or body 'help' to rules-users-requ...@lists.jboss.org You can reach the person managing the list at rules-users-ow...@lists.jboss.org When replying, please edit your Subject line so it is more specific than Re: Contents of rules-users digest... Today's Topics: 1. Re: Perfromance issues and memory leaks in Drools (Edson Tirelli) -- Message: 1 Date: Fri, 17 Sep 2010 11:04:55 -0400 From: Edson Tirelli tire...@post.com Subject: Re: [rules-users] Perfromance issues and memory leaks in Drools To: Rules Users List rules-users@lists.jboss.org Message-ID: aanlktinr2-+twt_myoijf1rc_waw7e6cvtwjpngkb...@mail.gmail.com Content-Type: text/plain; charset=windows-1252 Nikhil, Maybe you are using the term memory leak loosely here, but otherwise, Drools 4.0.7 and Drools 5.0.1 were both tested to exhaustion for memory leaks and I can tell you that no memory leak was found, and I personally doubt there is one there on regular use. Also, FYI, Drools 5.x eliminates the need for shadow facts, what is a considerable memory save over 4.x, but adds some other overheads for performance improvement that kind of offset those gains. On the other hand, Drools 5.1.1 takes the algorithm to a new level, saving a lot of memory on systems that use modify actions on their rules. http://blog.athico.com/2010/03/drools-halves-memory-use-with-new-true.html Regarding your performance, all I can tell you is that a rules engine is a relational engine that works pretty much like a database, and rules as databases queries. The same way you can write SQL queries that run fast or slow on a database, you can write rules that run fast or slow on a rules engine. It all depends on how the rules/queries are written, how your data model/domain model looks like, etc. So, regarding your question, we can't tell you how to improve those metrics without knowing your domain model, rules and etc. []s Edson 2010/9/17 Nikhil S. Kulkarni nikhil.kulka...@mastek.com Hi, I have written 2 different Drools programs. One is with Using rule Base of Drools 4.0 and other is using Knowledge Base of Drools 5.0. I was trying to check that is there any improvement in Drools 5.0. But I haven?t got any performance improvement in Drools 5.0 code compared to Drools 4.0. One more important thing is I am calling this drools code from My application which itself is heavy application, when I am doing Performance tuning I got one point i.e. session.execute() method is taking around 6-7 seconds to initialize rules and even the memory utilized by Rules is huge. So is there any way that we can reduce the Memory leakage and improve performance. Waiting for Reply. Thanks Regards, Nikhil S. Kulkarni Emp No: - 9254 MASTEK LTD. In the US, we're called MAJESCOMASTEK ~~ Opinions expressed in this e-mail are those of the individual and not that of Mastek Limited, unless specifically indicated to that effect. Mastek Limited does not accept any responsibility or liability for it. This e-mail and attachments (if any) transmitted with it are confidential and/or privileged and solely for the use of the intended person or entity to which it is addressed. Any review, re-transmission, dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient is
Re: [rules-users] Perfromance issues and memory leaks in Drools (Edson Tirelli)
Hi Nikhil, If it's taking 5-6 seconds as you said, it means that you are compiling your rules at runtime. To improve that, you could find a way to cache your KnowledgeBase*s* - that would make your rules be compiled only once and subsequent creation of stateless or stateful sessions would be pretty quick. To go further, you could create the knowledge bases using precompiled rules. For that, I use a maven plugin that compiles my drls at build time. I don't have a link now, but you should be able to find it. Sharing your knowledge bases and precompiling your rules will certainly make a difference. Hope that helps. Leo. On Sat, Sep 18, 2010 at 10:00 AM, Nikhil S. Kulkarni nikhil.kulka...@mastek.com wrote: Hi Edson, Thanks for the information. But now I want to ask you one thing. I have seen your post. The problem in application is mainly usage of memory You posted that Match 30,2010. I downloaded Drools 5.0 on August 2009 and I am using that. SO this True modify algorithm is implemented in Drools 5.1 only or it is even available in latest Drools 5.0 If I use Drools 5.1 then Whether I will get any advantage. In application we are using Rules Template ,Rule Flows and drls. When I am calling Rules from Java then it is taking more time compared to calling Java method from rules. In addition to this can u suggest me how to write better rules Query. I am using very simple way of writing Rules Query like :- When Abc : ABC(condition==A) Then Call method End; Thanks Regards, Nikhil S. Kulkarni -Original Message- From: rules-users-boun...@lists.jboss.org [mailto: rules-users-boun...@lists.jboss.org] On Behalf Of rules-users-requ...@lists.jboss.org Sent: Friday, September 17, 2010 9:30 PM To: rules-users@lists.jboss.org Subject: rules-users Digest, Vol 46, Issue 58 Send rules-users mailing list submissions to rules-users@lists.jboss.org To subscribe or unsubscribe via the World Wide Web, visit https://lists.jboss.org/mailman/listinfo/rules-users or, via email, send a message with subject or body 'help' to rules-users-requ...@lists.jboss.org You can reach the person managing the list at rules-users-ow...@lists.jboss.org When replying, please edit your Subject line so it is more specific than Re: Contents of rules-users digest... Today's Topics: 1. Re: Perfromance issues and memory leaks in Drools (Edson Tirelli) -- Message: 1 Date: Fri, 17 Sep 2010 11:04:55 -0400 From: Edson Tirelli tire...@post.com Subject: Re: [rules-users] Perfromance issues and memory leaks in Drools To: Rules Users List rules-users@lists.jboss.org Message-ID: aanlktinr2-+twt_myoijf1rc_waw7e6cvtwjpngkb...@mail.gmail.comaanlktinr2-%2btwt_myoijf1rc_waw7e6cvtwjpngkb...@mail.gmail.com Content-Type: text/plain; charset=windows-1252 Nikhil, Maybe you are using the term memory leak loosely here, but otherwise, Drools 4.0.7 and Drools 5.0.1 were both tested to exhaustion for memory leaks and I can tell you that no memory leak was found, and I personally doubt there is one there on regular use. Also, FYI, Drools 5.x eliminates the need for shadow facts, what is a considerable memory save over 4.x, but adds some other overheads for performance improvement that kind of offset those gains. On the other hand, Drools 5.1.1 takes the algorithm to a new level, saving a lot of memory on systems that use modify actions on their rules. http://blog.athico.com/2010/03/drools-halves-memory-use-with-new-true.html Regarding your performance, all I can tell you is that a rules engine is a relational engine that works pretty much like a database, and rules as databases queries. The same way you can write SQL queries that run fast or slow on a database, you can write rules that run fast or slow on a rules engine. It all depends on how the rules/queries are written, how your data model/domain model looks like, etc. So, regarding your question, we can't tell you how to improve those metrics without knowing your domain model, rules and etc. []s Edson 2010/9/17 Nikhil S. Kulkarni nikhil.kulka...@mastek.com Hi, I have written 2 different Drools programs. One is with Using rule Base of Drools 4.0 and other is using Knowledge Base of Drools 5.0. I was trying to check that is there any improvement in Drools 5.0. But I haven?t got any performance improvement in Drools 5.0 code compared to Drools 4.0. One more important thing is I am calling this drools code from My application which itself is heavy application, when I am doing Performance tuning I got one point i.e. session.execute() method is taking around 6-7 seconds to initialize rules and even the memory utilized by Rules is huge. So is there any way that we can reduce the Memory
[rules-users] drools quirks
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
I just started using drools and this is my first time implementing a
rules engine. Everything has been pretty smooth but I have some
quirks that I am not sure I can live with.
1) for some reason, if I execute the Knowlege session against an
object, the knowlege session never returns. The only way I can get
the ksession to return is to make IF (obj == null) part of the LHS and
make modify($input){setObj(complete)} part of the RHS
This seems like a deficiency since I have users writing their own
rules, I can see them forgetting this requirement. IS their a way to
get the ksession to firerules only once? If so what does that look like?
2) It seems that any code I want can be executed in the RHS. I could
literally execute something like the following in the RHS.
byte[] b= new byte[10]; // Really big memory waste
I also could just start a bunch of threads.
The point is that I am intending to let the users write their own
rules but I can't do that if there are no restrictions on how/what can
be done inside the rules. Any suggestions? Are there sandboxes or
filters I can activate to restrict the RHS?
- --
Cheers,
Matt Young
so...@youngdev.net
http://youngdev.net
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Re: [rules-users] drools quirks
On 18 September 2010 16:15, Matt Young so...@youngdev.net wrote:
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Hash: SHA1
I just started using drools and this is my first time implementing a
rules engine. Everything has been pretty smooth but I have some
quirks that I am not sure I can live with.
1) for some reason, if I execute the Knowlege session against an
object, the knowlege session never returns.
I don't understand the term execute...against an object. Do you mean
that you have just one fact inserted befor you call fireAllRules()?
But anyway, this call not returning is almost certainly due to a loop
in your rules, or have you made sure that they don't?
The only way I can get
the ksession to return is to make IF (obj == null) part of the LHS and
make modify($input){setObj(complete)} part of the RHS
This seems like a deficiency since I have users writing their own
rules, I can see them forgetting this requirement.
Writing rules is programming, no holds barred :-)
Look into Domain Specific Languages (DSL) as a cushion for the unwary.
IS their a way to
get the ksession to firerules only once? If so what does that look like?
kSession.fireUntilHalt( 1 );
2) It seems that any code I want can be executed in the RHS. I could
literally execute something like the following in the RHS.
byte[] b= new byte[10]; // Really big memory waste
I also could just start a bunch of threads.
The point is that I am intending to let the users write their own
rules but I can't do that if there are no restrictions on how/what can
be done inside the rules. Any suggestions? Are there sandboxes or
filters I can activate to restrict the RHS?
Again: DSL.
Also, Rule Templates might be the starting point; it'd depend on what
the may be allowed to do.
And what about good old-fashioned training?!
-W
- --
Cheers,
Matt Young
so...@youngdev.net
http://youngdev.net
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Re: [rules-users] drools quirks
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maybe now would be a good time for some code. Here is how I am
executing the rules against the object:
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
KnowledgeBuilder kbuilder =
KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add(ResourceFactory.newByteArrayResource(ruledata),ResourceType.DRL
);
if ( kbuilder.hasErrors() ) {
System.err.println( kbuilder.getErrors().toString() );
}
kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
StatelessKnowledgeSession ksession =
kbase.newStatelessKnowledgeSession();
ksession.execute(document);
Here is the rule:
package sample1
import sample1.bean.EventRulesDocument;
import sample1.bean.Transaction;
import java.util.Date;
rule Standard processing rule
when
$doc : EventRulesDocument(
ruleRun == false # Wolfgang
event != null event.eventType.eventCode == testevent )
then
Transaction t = new Transaction();
t.setEvent($doc.getEvent());
t.setCategory($doc.getEvent().getEventType().getEventCode());
t.setTransactionAmount($doc.getEvent().getEventAmount());
t.setCreateTs(new Date());
t.setUsername($doc.getEvent().getCreateUsername());
modify( $doc ) {setRuleRun(true)}; # Wolfgang
modify( $doc ) {addSaveTransaction(t)} ;
end
If I take out the 2 lines marked Wolfgang, the ksession never
returns from the execute() method.
Additionally If any code in the world can be executed in the RHS, then
why shouldn't I just use groovy as my rule language? At least then, I
can write math like such:
def num1=95;
def num2=90;
def num3=num2/num1;
and all of the math is done with big decimal objects. IF there is no
restriction on what can be done in the RHS what is the advantage to
using a rules engine over a general purpose scripting language? The
whole purpose for me choosing drools over Groovy eval() was that I
didn't want to give my users the ability to spawn threads, allocate
massive amounts of memory etc.
On 09/18/2010 10:59 AM, Wolfgang Laun wrote:
On 18 September 2010 16:15, Matt Young so...@youngdev.net
mailto:so...@youngdev.net wrote:
I just started using drools and this is my first time implementing
a rules engine. Everything has been pretty smooth but I have
some quirks that I am not sure I can live with. 1) for some reason,
if I execute the Knowlege session against an object, the knowlege
session never returns.
I don't understand the term execute...against an object. Do you
mean that you have just one fact inserted befor you call
fireAllRules()?
But anyway, this call not returning is almost certainly due to a
loop in your rules, or have you made sure that they don't?
The only way I can get the ksession to return is to make IF (obj ==
null) part of the LHS and make modify($input){setObj(complete)}
part of the RHS This seems like a deficiency since I have users
writing their own rules, I can see them forgetting this
requirement.
Writing rules is programming, no holds barred :-)
Look into Domain Specific Languages (DSL) as a cushion for the
unwary.
IS their a way to get the ksession to firerules only once? If so
what does that look like?
kSession.fireUntilHalt( 1 );
2) It seems that any code I want can be executed in the RHS. I
could literally execute something like the following in the RHS.
byte[] b= new byte[10]; // Really big memory waste
I also could just start a bunch of threads.
The point is that I am intending to let the users write their own
rules but I can't do that if there are no restrictions on how/what
can be done inside the rules. Any suggestions? Are there
sandboxes or filters I can activate to restrict the RHS?
Again: DSL.
Also, Rule Templates might be the starting point; it'd depend on
what the may be allowed to do.
And what about good old-fashioned training?!
-W
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- --
Cheers,
Matt Young
so...@youngdev.net
http://youngdev.net
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Re: [rules-users] drools quirks
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Hash: SHA1
OK I looked closer at what Wolfgang said. By calling fireAllRules(int
limit) instead of execute(object), my rules now fire and return
immidiately without having to set a false condition for the lhs in the RHS
That still does not give me the ability to properly restrict what
objects the rules can create etc.
On 09/18/2010 10:59 AM, Wolfgang Laun wrote:
On 18 September 2010 16:15, Matt Young so...@youngdev.net
mailto:so...@youngdev.net wrote:
I just started using drools and this is my first time implementing
a rules engine. Everything has been pretty smooth but I have
some quirks that I am not sure I can live with. 1) for some reason,
if I execute the Knowlege session against an object, the knowlege
session never returns.
I don't understand the term execute...against an object. Do you
mean that you have just one fact inserted befor you call
fireAllRules()?
But anyway, this call not returning is almost certainly due to a
loop in your rules, or have you made sure that they don't?
The only way I can get the ksession to return is to make IF (obj ==
null) part of the LHS and make modify($input){setObj(complete)}
part of the RHS This seems like a deficiency since I have users
writing their own rules, I can see them forgetting this
requirement.
Writing rules is programming, no holds barred :-)
Look into Domain Specific Languages (DSL) as a cushion for the
unwary.
IS their a way to get the ksession to firerules only once? If so
what does that look like?
kSession.fireUntilHalt( 1 );
2) It seems that any code I want can be executed in the RHS. I
could literally execute something like the following in the RHS.
byte[] b= new byte[10]; // Really big memory waste
I also could just start a bunch of threads.
The point is that I am intending to let the users write their own
rules but I can't do that if there are no restrictions on how/what
can be done inside the rules. Any suggestions? Are there
sandboxes or filters I can activate to restrict the RHS?
Again: DSL.
Also, Rule Templates might be the starting point; it'd depend on
what the may be allowed to do.
And what about good old-fashioned training?!
-W
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- --
Cheers,
Matt Young
so...@youngdev.net
http://youngdev.net
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Re: [rules-users] Perfromance issues and memory leaks in Drools (Edson Tirelli)
That improvement was developed for Drools 5.1.x. The current version on the downloads page is 5.1.1. As mentioned by Leonardo, make sure you are not rebuilding the kbase every time. Just create it once and reuse it for your sessions. Edson 2010/9/18 Nikhil S. Kulkarni nikhil.kulka...@mastek.com: Hi Edson, Thanks for the information. But now I want to ask you one thing. I have seen your post. The problem in application is mainly usage of memory You posted that Match 30,2010. I downloaded Drools 5.0 on August 2009 and I am using that. SO this True modify algorithm is implemented in Drools 5.1 only or it is even available in latest Drools 5.0 If I use Drools 5.1 then Whether I will get any advantage. In application we are using Rules Template ,Rule Flows and drls. When I am calling Rules from Java then it is taking more time compared to calling Java method from rules. In addition to this can u suggest me how to write better rules Query. I am using very simple way of writing Rules Query like :- When Abc : ABC(condition==A) Then Call method End; Thanks Regards, Nikhil S. Kulkarni -Original Message- From: rules-users-boun...@lists.jboss.org [mailto:rules-users-boun...@lists.jboss.org] On Behalf Of rules-users-requ...@lists.jboss.org Sent: Friday, September 17, 2010 9:30 PM To: rules-users@lists.jboss.org Subject: rules-users Digest, Vol 46, Issue 58 Send rules-users mailing list submissions to rules-us...@lists.jboss.org To subscribe or unsubscribe via the World Wide Web, visit https://lists.jboss.org/mailman/listinfo/rules-users or, via email, send a message with subject or body 'help' to rules-users-requ...@lists.jboss.org You can reach the person managing the list at rules-users-ow...@lists.jboss.org When replying, please edit your Subject line so it is more specific than Re: Contents of rules-users digest... Today's Topics: 1. Re: Perfromance issues and memory leaks in Drools (Edson Tirelli) -- Message: 1 Date: Fri, 17 Sep 2010 11:04:55 -0400 From: Edson Tirelli tire...@post.com Subject: Re: [rules-users] Perfromance issues and memory leaks in Drools To: Rules Users List rules-users@lists.jboss.org Message-ID: aanlktinr2-+twt_myoijf1rc_waw7e6cvtwjpngkb...@mail.gmail.com Content-Type: text/plain; charset=windows-1252 Nikhil, Maybe you are using the term memory leak loosely here, but otherwise, Drools 4.0.7 and Drools 5.0.1 were both tested to exhaustion for memory leaks and I can tell you that no memory leak was found, and I personally doubt there is one there on regular use. Also, FYI, Drools 5.x eliminates the need for shadow facts, what is a considerable memory save over 4.x, but adds some other overheads for performance improvement that kind of offset those gains. On the other hand, Drools 5.1.1 takes the algorithm to a new level, saving a lot of memory on systems that use modify actions on their rules. http://blog.athico.com/2010/03/drools-halves-memory-use-with-new-true.html Regarding your performance, all I can tell you is that a rules engine is a relational engine that works pretty much like a database, and rules as databases queries. The same way you can write SQL queries that run fast or slow on a database, you can write rules that run fast or slow on a rules engine. It all depends on how the rules/queries are written, how your data model/domain model looks like, etc. So, regarding your question, we can't tell you how to improve those metrics without knowing your domain model, rules and etc. []s Edson 2010/9/17 Nikhil S. Kulkarni nikhil.kulka...@mastek.com Hi, I have written 2 different Drools programs. One is with Using rule Base of Drools 4.0 and other is using Knowledge Base of Drools 5.0. I was trying to check that is there any improvement in Drools 5.0. But I haven?t got any performance improvement in Drools 5.0 code compared to Drools 4.0. One more important thing is I am calling this drools code from My application which itself is heavy application, when I am doing Performance tuning I got one point i.e. session.execute() method is taking around 6-7 seconds to initialize rules and even the memory utilized by Rules is huge. So is there any way that we can reduce the Memory leakage and improve performance. Waiting for Reply. Thanks Regards, Nikhil S. Kulkarni Emp No: - 9254 MASTEK LTD. In the US, we're called MAJESCOMASTEK ~~ Opinions expressed in this e-mail are those of the individual and not that of Mastek Limited, unless specifically indicated to that effect. Mastek Limited does not accept any responsibility or liability
Re: [rules-users] drools quirks
On 18 September 2010 17:19, Matt Young so...@youngdev.net wrote:
ksession.execute(document);
I suppose this inserts a single EventRulesDocument object.
Here is the rule:
package sample1
import sample1.bean.EventRulesDocument;
import sample1.bean.Transaction;
import java.util.Date;
rule Standard processing rule
when
$doc : EventRulesDocument(
ruleRun == false # Wolfgang
event != null event.eventType.eventCode == testevent )
then
Transaction t = new Transaction();
t.setEvent($doc.getEvent());
t.setCategory($doc.getEvent().getEventType().getEventCode());
t.setTransactionAmount($doc.getEvent().getEventAmount());
t.setCreateTs(new Date());
t.setUsername($doc.getEvent().getCreateUsername());
modify( $doc ) {setRuleRun(true)}; # Wolfgang
modify( $doc ) {addSaveTransaction(t)} ;
Here it is: You modify the EventRulesDocument, which causes another
activation of the same rule. One way of avoiding this is to add the rule
attribute no-loop true; another one is what you've done.
This isn't going to be your only rule?? This one alone is scant reason to
use an RBS.
fireAllRules( 1 ) isn't a good remedy, because (normally) a Production
System
relies on repeated firings, depending on rules and facts.
end
Additionally If any code in the world can be executed in the RHS, then
why shouldn't I just use groovy as my rule language? At least then, I
can write math like such:
def num1=95;
def num2=90;
def num3=num2/num1;
and all of the math is done with big decimal objects. IF there is no
restriction on what can be done in the RHS what is the advantage to
using a rules engine over a general purpose scripting language?
There is a good section in the Drools Expert manual: Why use a rule
engine?.
Don't do it just to be trendy ;-)
The
whole purpose for me choosing drools over Groovy eval() was that I
didn't want to give my users the ability to spawn threads, allocate
massive amounts of memory etc.
Seriously now, a Domain Specifiy Language is the maximum corset you can
force upon your users. But you'll have to know *all* they *may *do, and all
the
conditions.
-W
On 09/18/2010 10:59 AM, Wolfgang Laun wrote:
On 18 September 2010 16:15, Matt Young so...@youngdev.net
mailto:so...@youngdev.net wrote:
I just started using drools and this is my first time implementing
a rules engine. Everything has been pretty smooth but I have
some quirks that I am not sure I can live with. 1) for some reason,
if I execute the Knowlege session against an object, the knowlege
session never returns.
I don't understand the term execute...against an object. Do you
mean that you have just one fact inserted befor you call
fireAllRules()?
But anyway, this call not returning is almost certainly due to a
loop in your rules, or have you made sure that they don't?
The only way I can get the ksession to return is to make IF (obj ==
null) part of the LHS and make modify($input){setObj(complete)}
part of the RHS This seems like a deficiency since I have users
writing their own rules, I can see them forgetting this
requirement.
Writing rules is programming, no holds barred :-)
Look into Domain Specific Languages (DSL) as a cushion for the
unwary.
IS their a way to get the ksession to firerules only once? If so
what does that look like?
kSession.fireUntilHalt( 1 );
2) It seems that any code I want can be executed in the RHS. I
could literally execute something like the following in the RHS.
byte[] b= new byte[10]; // Really big memory waste
I also could just start a bunch of threads.
The point is that I am intending to let the users write their own
rules but I can't do that if there are no restrictions on how/what
can be done inside the rules. Any suggestions? Are there
sandboxes or filters I can activate to restrict the RHS?
Again: DSL.
Also, Rule Templates might be the starting point; it'd depend on
what the may be allowed to do.
And what about good old-fashioned training?!
-W
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- --
Cheers,
Matt Young
so...@youngdev.net
http://youngdev.net
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Re: [rules-users] forall not delivering as expected
On 15 September 2010 17:11, Edson Tirelli tire...@post.com wrote: Hey Wolfgang, I owe you a few answers on this and other e-mails... I will try to reply to all of them by EOD today... just been busy trying to finish the parser changes... All right! Occasionally, I'd like to get them, though ;-) -W ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] Welcome to the rules-users mailing list
Hello, I can see Drools 5.1 is going to add support for Spring integration. How about Seams, I think it is already integrated, because in all presentations, I haven't seen anyone referring to Seam. Thanks -Original Message- From: rules-users-boun...@lists.jboss.org [mailto:rules-users-boun...@lists.jboss.org] On Behalf Of rules-users-requ...@lists.jboss.org Sent: Saturday, September 18, 2010 2:25 PM To: boy1...@gmail.com Subject: Welcome to the rules-users mailing list Welcome to the rules-users@lists.jboss.org mailing list! To post to this list, send your email to: rules-users@lists.jboss.org General information about the mailing list is at: https://lists.jboss.org/mailman/listinfo/rules-users If you ever want to unsubscribe or change your options (eg, switch to or from digest mode, change your password, etc.), visit your subscription page at: https://lists.jboss.org/mailman/options/rules-users/boy18nj%40gmail.com You can also make such adjustments via email by sending a message to: rules-users-requ...@lists.jboss.org with the word `help' in the subject or body (don't include the quotes), and you will get back a message with instructions. You must know your password to change your options (including changing the password, itself) or to unsubscribe. It is: newpassword1 Normally, Mailman will remind you of your lists.jboss.org mailing list passwords once every month, although you can disable this if you prefer. This reminder will also include instructions on how to unsubscribe or change your account options. There is also a button on your options page that will email your current password to you. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] drools quirks
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
Thanks Wolfgang,
The no-loop attribute fixed my crazy looping problem and your answer
on knowing EVERYTHING the rule might ever have to do is a good
answer. I guess there will be a certain amount of trust I have to
place in the users. In the meantime, are there any books on drools
you reccomend (other than the manual)?
On 09/18/2010 01:24 PM, Wolfgang Laun wrote:
On 18 September 2010 17:19, Matt Young so...@youngdev.net
mailto:so...@youngdev.net wrote:
ksession.execute(document);
I suppose this inserts a single EventRulesDocument object.
Here is the rule:
package sample1
import sample1.bean.EventRulesDocument; import
sample1.bean.Transaction; import java.util.Date;
rule Standard processing rule
when $doc : EventRulesDocument( ruleRun == false #
Wolfgang event != null event.eventType.eventCode == testevent
) then
Transaction t = new Transaction(); t.setEvent($doc.getEvent());
t.setCategory($doc.getEvent().getEventType().getEventCode());
t.setTransactionAmount($doc.getEvent().getEventAmount());
t.setCreateTs(new Date());
t.setUsername($doc.getEvent().getCreateUsername());
modify( $doc ) {setRuleRun(true)}; # Wolfgang modify( $doc
) {addSaveTransaction(t)} ;
Here it is: You modify the EventRulesDocument, which causes
another activation of the same rule. One way of avoiding this is to
add the rule attribute no-loop true; another one is what you've
done.
This isn't going to be your only rule?? This one alone is scant
reason to use an RBS.
fireAllRules( 1 ) isn't a good remedy, because (normally) a
Production System relies on repeated firings, depending on rules
and facts.
end
Additionally If any code in the world can be executed in the RHS,
then why shouldn't I just use groovy as my rule language? At
least then, I can write math like such: def num1=95; def num2=90;
def num3=num2/num1;
and all of the math is done with big decimal objects. IF there is
no restriction on what can be done in the RHS what is the advantage
to using a rules engine over a general purpose scripting language?
There is a good section in the Drools Expert manual: Why use a
rule engine?. Don't do it just to be trendy ;-)
The whole purpose for me choosing drools over Groovy eval() was
that I didn't want to give my users the ability to spawn threads,
allocate massive amounts of memory etc.
Seriously now, a Domain Specifiy Language is the maximum corset you
can force upon your users. But you'll have to know /all/ they /may
/do, and all the conditions.
-W
On 09/18/2010 10:59 AM, Wolfgang Laun wrote:
On 18 September 2010 16:15, Matt Young so...@youngdev.net
mailto:so...@youngdev.net
mailto:so...@youngdev.net mailto:so...@youngdev.net wrote:
I just started using drools and this is my first time
implementing a rules engine. Everything has been pretty smooth
but I have some quirks that I am not sure I can live with. 1) for
some
reason,
if I execute the Knowlege session against an object, the
knowlege session never returns.
I don't understand the term execute...against an object. Do
you mean that you have just one fact inserted befor you call
fireAllRules()?
But anyway, this call not returning is almost certainly due to
a loop in your rules, or have you made sure that they don't?
The only way I can get the ksession to return is to make IF
(obj ==
null) part of the LHS and make
modify($input){setObj(complete)} part of the RHS This seems
like a deficiency since I have users writing their own rules, I
can see them forgetting this requirement.
Writing rules is programming, no holds barred :-)
Look into Domain Specific Languages (DSL) as a cushion for the
unwary.
IS their a way to get the ksession to firerules only once? If
so what does that look like?
kSession.fireUntilHalt( 1 );
2) It seems that any code I want can be executed in the RHS. I
could literally execute something like the following in the RHS.
byte[] b= new byte[10]; // Really big memory waste
I also could just start a bunch of threads.
The point is that I am intending to let the users write their
own rules but I can't do that if there are no restrictions on
how/what can be done inside the rules. Any suggestions? Are
there sandboxes or filters I can activate to restrict the RHS?
Again: DSL.
Also, Rule Templates might be the starting point; it'd depend
on what the may be allowed to do.
And what about good old-fashioned training?!
-W
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Re: [rules-users] drools quirks
On 18 September 2010 21:15, Matt Young so...@youngdev.net wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Thanks Wolfgang, The no-loop attribute fixed my crazy looping problem and your answer on knowing EVERYTHING the rule might ever have to do is a good answer. I guess there will be a certain amount of trust I have to place in the users. In the meantime, are there any books on drools you reccomend (other than the manual)? The standard (or only?) answer to this is: Michal Bali's book, see https://www.packtpub.com/drools-jboss-rules-5-0-developers-guide/book If you are new to Rules and Rule Based Systems, you might also profit from more general literature on RBS, even when a text is not direclty related to Drools. -W ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] Finding Multiple Solutions using Drools Planner
Hello Drools Users,I've been investigating Drools Planner for a few weeks and can't figure out how to accomplish a crucial requirement.In my application I need to have Planner return multiple solutions for one planning problem. More specifically I need is to find all of the ideal solutions to my planning problem. My problem is similar to the n-queens problem in that there exist ideal solutions. It is however somewhat simpler because the number of ideal solutions is fairly small (maybe a max of 10 or so).I've looked through the mailing list archives for similar requests and the best I could find was:http://drools-java-rules-engine.46999.n3.nabble.com/the-n-best-solutions-on-a-very-simple-test-case-td60618.htmlI took the advice of the poster in that thread and extended BestSolutionRecaller. I'm running into some problems getting Planner to continue after an optimal solution is found.My question is this. Is extending the BestSolutionRecaller the best way to achieve my goal? Or do you think it would be simpler to do this another way? Perhaps running Planner multiple times with already discovered solutions provided as input.Any advice would be appreciated.Thanks,Steve___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] drools syntax highlighting editor
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 is there a drools syntax highlighting widget along the lines of tinymce for regular html pages. I'm certain there is a seam or JSF component but my application is a JSP based springmvc application and I would like to not have to migrate to something else, just to provided a good rules editor in my application. - -- Cheers, Matt Young so...@youngdev.net http://youngdev.net -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.10 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQIcBAEBAgAGBQJMlSqqAAoJEO5jycTTPEzcm4gQAJzG22gY+KRj+D6EdJzH4PfH /WARpfHy+wtyy2N6WGmvpOnmUXsa4f4OTyIdU/DPf+4Sg+qSrDzZ3FzcTB3clQwD vRVxfcF3ggGzEgZxUYVsaJdAtuhOn/rTwlybZZJYhHVnSorglMWn/eGbzrTtFpMs CWTl4oewkamKHfGcBOymhEs5CwCuCG18HEwggYAirnO278T3zm4N1b+eTyp2vpyQ EP+KwIUbjCHyve3u2J2qOLw5ajlUe8rM2z8bRSXgRZUUwtcWl9I66l08oS21/4ZF Yfnqz1SoEgcKW2Cd8KjQ7ELihP9PGFfwCAvLZv+A1fIGIgqNRY/bKVIo+cB0s8Pb OWKgYIbGTKD34xon858J/yxkeh4NQS24RJXj/1WoKsqvbmB3OmBDdK4MkAaF1rtg iTGGp56AaXSI+FMRUF6tTESQCai+g6noKQqyjooWcmO8fETFBsKs/k2voATziJ9z OgVjwfQ3akO0SpFNggnG3YEFqWqaHlkeBw8cFt7LtVQf+S2YBEvkAqA7digb+czK d/MdnhmGvshBXquJDUwwPcS6/+Q3c5PbBIoKxUTPmcKOL5JS29NfQOjsuJtMX1uS xZ4HPlCkIncJLyYNuuwSja5qMgtxX0FYRCk7VZERevr0gUETtUWmigENJEAVHL1a CbVl9QDLfAChJ5crxwDd =VjEx -END PGP SIGNATURE- ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] Flow Timer causes exception: Caused by: java.util.concurrent.RejectedExecutionException
Hi, I have a flow and a set of rules. In the flow I have a wait state. If the wait state has a timer, when the flow reaches the node it blows up with the following exception ( See Below ), if I remove the timer everything works. INFO 2010-09-18 16:26:28 [ERROR] com.kgcontrols.services.raytheon.standardsRequests.workflow.managers.DroolsEventsManager Could not commit session java.lang.RuntimeException: Could not commit session at org.drools.persistence.session.SingleSessionCommandService.execute(SingleSessionCommandService.java:292) at org.drools.command.impl.CommandBasedStatefulKnowledgeSession.execute(CommandBasedStatefulKnowledgeSession.java:434) at com.kgcontrols.services.raytheon.standardsRequests.workflow.managers.DroolsEventsManager.sendEvent(DroolsEventsManager.java:43) at com.kgcontrols.services.raytheon.standardsRequests.workflow.Rule_domainLeadReject_0.defaultConsequence(Rule_domainLeadReject_0.java:10) at com.kgcontrols.services.raytheon.standardsRequests.workflow.Rule_domainLeadReject_0DefaultConsequenceInvoker.evaluate(Rule_domainLeadReject_0DefaultConsequenceInvoker.java:34) at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:917) at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:856) at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1071) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:785) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:751) at org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:218) at org.drools.command.runtime.rule.FireAllRulesCommand.execute(FireAllRulesCommand.java:99) at org.drools.command.runtime.rule.FireAllRulesCommand.execute(FireAllRulesCommand.java:33) at org.drools.persistence.session.SingleSessionCommandService.execute(SingleSessionCommandService.java:279) at org.drools.command.impl.CommandBasedStatefulKnowledgeSession.fireAllRules(CommandBasedStatefulKnowledgeSession.java:201) at com.kgcontrols.services.raytheon.standardsRequests.workflow.listeners.VoteCreatedEventListener.onMessage(VoteCreatedEventListener.java:78) at org.apache.activemq.ActiveMQMessageConsumer.dispatch(ActiveMQMessageConsumer.java:854) at org.apache.activemq.ActiveMQSessionExecutor.dispatch(ActiveMQSessionExecutor.java:99) at org.apache.activemq.ActiveMQSessionExecutor.iterate(ActiveMQSessionExecutor.java:166) at org.apache.activemq.thread.PooledTaskRunner.runTask(PooledTaskRunner.java:117) at org.apache.activemq.thread.PooledTaskRunner.access$100(PooledTaskRunner.java:26) at org.apache.activemq.thread.PooledTaskRunner$1.run(PooledTaskRunner.java:44) at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650) at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675) at java.lang.Thread.run(Thread.java:619) Caused by: java.util.concurrent.RejectedExecutionException at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:1768) at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:767) at java.util.concurrent.ScheduledThreadPoolExecutor.delayedExecute(ScheduledThreadPoolExecutor.java:216) at java.util.concurrent.ScheduledThreadPoolExecutor.schedule(ScheduledThreadPoolExecutor.java:379) at org.drools.time.impl.JDKTimerService.schedule(JDKTimerService.java:102) at org.drools.time.impl.JDKTimerService.scheduleJob(JDKTimerService.java:80) at org.drools.process.instance.timer.TimerManager.registerTimer(TimerManager.java:60) at org.drools.workflow.instance.node.StateBasedNodeInstance.internalTrigger(StateBasedNodeInstance.java:56) at org.drools.workflow.instance.node.CompositeNodeInstance.internalTrigger(CompositeNodeInstance.java:86) at org.drools.workflow.instance.node.StateNodeInstance.internalTrigger(StateNodeInstance.java:48) at org.drools.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:117) at org.drools.workflow.instance.impl.NodeInstanceImpl.triggerConnection(NodeInstanceImpl.java:178) at org.drools.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:144) at org.drools.workflow.instance.impl.ExtendedNodeInstanceImpl.triggerCompleted(ExtendedNodeInstanceImpl.java:53) at org.drools.workflow.instance.node.StateBasedNodeInstance.triggerCompleted(StateBasedNodeInstance.java:117) at org.drools.workflow.instance.node.StateBasedNodeInstance.triggerCompleted(StateBasedNodeInstance.java:98) at
Re: [rules-users] Flow Timer causes exception: Caused by: java.util.concurrent.RejectedExecutionException
Hello All, Why don't we have an community forum website like JBoss Drools forum where we can post questions/answers unlike this mailing list and if someone has to go back to old posts, how tough it gets to go thru email archives. No offence here. Thanks -Original Message- From: rules-users-boun...@lists.jboss.org [mailto:rules-users-boun...@lists.jboss.org] On Behalf Of Gustavo Tenrreiro Sent: Saturday, September 18, 2010 5:37 PM To: Rules Users List Subject: [rules-users] Flow Timer causes exception: Caused by: java.util.concurrent.RejectedExecutionException Hi, I have a flow and a set of rules. In the flow I have a wait state. If the wait state has a timer, when the flow reaches the node it blows up with the following exception ( See Below ), if I remove the timer everything works. INFO 2010-09-18 16:26:28 [ERROR] com.kgcontrols.services.raytheon.standardsRequests.workflow.managers.DroolsE ventsManager Could not commit session java.lang.RuntimeException: Could not commit session at org.drools.persistence.session.SingleSessionCommandService.execute(SingleSes sionCommandService.java:292) at org.drools.command.impl.CommandBasedStatefulKnowledgeSession.execute(Command BasedStatefulKnowledgeSession.java:434) at com.kgcontrols.services.raytheon.standardsRequests.workflow.managers.DroolsE ventsManager.sendEvent(DroolsEventsManager.java:43) at com.kgcontrols.services.raytheon.standardsRequests.workflow.Rule_domainLeadR eject_0.defaultConsequence(Rule_domainLeadReject_0.java:10) at com.kgcontrols.services.raytheon.standardsRequests.workflow.Rule_domainLeadR eject_0DefaultConsequenceInvoker.evaluate(Rule_domainLeadReject_0DefaultCons equenceInvoker.java:34) at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:917) at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:856) at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1071) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.j ava:785) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.j ava:751) at org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeS essionImpl.java:218) at org.drools.command.runtime.rule.FireAllRulesCommand.execute(FireAllRulesComm and.java:99) at org.drools.command.runtime.rule.FireAllRulesCommand.execute(FireAllRulesComm and.java:33) at org.drools.persistence.session.SingleSessionCommandService.execute(SingleSes sionCommandService.java:279) at org.drools.command.impl.CommandBasedStatefulKnowledgeSession.fireAllRules(Co mmandBasedStatefulKnowledgeSession.java:201) at com.kgcontrols.services.raytheon.standardsRequests.workflow.listeners.VoteCr eatedEventListener.onMessage(VoteCreatedEventListener.java:78) at org.apache.activemq.ActiveMQMessageConsumer.dispatch(ActiveMQMessageConsumer .java:854) at org.apache.activemq.ActiveMQSessionExecutor.dispatch(ActiveMQSessionExecutor .java:99) at org.apache.activemq.ActiveMQSessionExecutor.iterate(ActiveMQSessionExecutor. java:166) at org.apache.activemq.thread.PooledTaskRunner.runTask(PooledTaskRunner.java:11 7) at org.apache.activemq.thread.PooledTaskRunner.access$100(PooledTaskRunner.java :26) at org.apache.activemq.thread.PooledTaskRunner$1.run(PooledTaskRunner.java:44) at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.run Task(ThreadPoolExecutor.java:650) at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:675) at java.lang.Thread.run(Thread.java:619) Caused by: java.util.concurrent.RejectedExecutionException at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(Thread PoolExecutor.java:1768) at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:767) at java.util.concurrent.ScheduledThreadPoolExecutor.delayedExecute(ScheduledThr eadPoolExecutor.java:216) at java.util.concurrent.ScheduledThreadPoolExecutor.schedule(ScheduledThreadPoo lExecutor.java:379) at org.drools.time.impl.JDKTimerService.schedule(JDKTimerService.java:102) at org.drools.time.impl.JDKTimerService.scheduleJob(JDKTimerService.java:80) at org.drools.process.instance.timer.TimerManager.registerTimer(TimerManager.ja va:60) at org.drools.workflow.instance.node.StateBasedNodeInstance.internalTrigger(Sta teBasedNodeInstance.java:56) at org.drools.workflow.instance.node.CompositeNodeInstance.internalTrigger(Comp ositeNodeInstance.java:86) at org.drools.workflow.instance.node.StateNodeInstance.internalTrigger(StateNod eInstance.java:48) at org.drools.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl. java:117) at
[rules-users] LHS compare two lists
Hi,
I'm trying to determine if a user has the required certifications for a
position. So I'm comparing the list of required certifications to the list
of User Certifications but I'm throwing a nullPointerException even though I
check to make sure the list are not null on their respective objects. How do
I iterate between both list?
rule Determine if the user has the required certifications
dialect 'mvel'
no-loop true
salience 80
when
$user : User()
$profile : UserProfile($userCertifications : userCertifications,
eval(userCertifications != null)) from $user.userProfile
$position : Position($certifications : requiredCertifications,
eval(requiredCertifications != null))
exists ($certification: Certification() from $certifications and
UserCertification(certification == $certification) from $userCertifications)
then
System.out.println(The user has the required certifications);
end
public UserProfile
{
ListUserCertification userCertifications;
//more fields
}
public Position
{
ListCertification requiredCertifications;
//more fields
}
public Certification
{
Long id;
String name;
//more fields
}
public UserCertification
{
Long id;
Date certificationDate;
Certification certification;
//more fields
}
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Re: [rules-users] Drools flow and BPEL (Drools 5.1)
Mark Jeff, Thanks for your replies! Tim -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Drools-flow-and-BPEL-Drools-5-1-tp1477882p1522799.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
