subject:"Re\: \[rules\-users\] query"

Re: [rules-users] Query regarding Upgrade to drools API 6.1.0

2014-09-01 Thread djb

You just use the old classes when writing a 5.X application, and the new ones
when writing a 6.X app.



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Re: [rules-users] Query on web services and database stuff

2013-02-14 Thread Michael Anstis

Firstly a correction.

Drools rule engine otherwise known as Drools Expert does not use JCR by
default. Guvnor (Drools rule authoring and management web applicafion) does
use JCR as its persistent store. JCR is better thought of as a hierarchical
data store than a (R)DBMS.

That said Drools Expert can access databases and web services with the
assistance of helper classes and the from keyword. The user guide will
give fuller details.

That said you are also free to retrieve Facts for insertion into Drools
Expert from where- and however you like.

sent on the move

On 14 Feb 2013 07:34, starfish15 pooja.gh...@accenture.com wrote:

Hello All,

I am starting up on a project which requires Drools rules. I have been
asked
certain basic Q's. Am jotting them below

1. *Can the Drools Rule engine communicate to a DB *

I know by default, drools does use the *Apache JackRabbit DB* to store
respective assets and there are means to use other DBs as well. Not sure
what else this Q could mean. So would really appreciate if some light can
be
thrown on this. What else things which could be achieved through the rules
and DB connection

2. *Can the Drools Rule engine do web service calls to other system*

I am not sure if this can be achieved through Drools. Would appreciate if
some assistance could be provided on this and some working examples as well
if this can actually be achieved.

Regards,
starfish

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Re: [rules-users] Query on web services and database stuff

2013-02-14 Thread Jeremy Ary

If you consider Drools Expert (the core engine) as a component, then
certainly, yes, it can be integrated into a system that both utilizes
persistence and communicates via web services in various ways respectively.
As for working examples, I'm of the opinion that would be stretching the
point of the mailing list, as these aren't concerns specific to Drools.
Baking in these functionalities makes no sense (kitchen sink mentality,
SoC) and providing examples of these would be to try and teach you
fundamentals of architectural and enterprise design. This is akin to asking
a car engine manufacturer how to create a steering mechanism and
6-passenger cabin, and provide examples of each. There are various
approaches (patterns) that suit different needs, but none tie directly to
the car engine.

On Thu, Feb 14, 2013 at 2:13 AM, Michael Anstis michael.ans...@gmail.comwrote:

Firstly a correction.

That said Drools Expert can access databases and web services with the
assistance of helper classes and the from keyword. The user guide will
give fuller details.

That said you are also free to retrieve Facts for insertion into Drools
Expert from where- and however you like.

sent on the move

On 14 Feb 2013 07:34, starfish15 pooja.gh...@accenture.com wrote:

Hello All,

I am starting up on a project which requires Drools rules. I have been
asked
certain basic Q's. Am jotting them below

1. *Can the Drools Rule engine communicate to a DB *

2. *Can the Drools Rule engine do web service calls to other system*

I am not sure if this can be achieved through Drools. Would appreciate if
some assistance could be provided on this and some working examples as
well
if this can actually be achieved.

Regards,
starfish

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Re: [rules-users] Query for a fact, and concurrent rule execution

2012-05-02 Thread Michael Anstis

Does each quote validation exercise enrich the StatefulKnowledgeSession
with other facts that could influence validation of other quotes?

If not probably using a StatefulKnowledgeSession per HTTP request might be
more simple (with the KnowledgeBase as an application scoped variable).

Regarding retrieval of results, there are a couple of options that spring
to mind:-

- Look at using a Global to collate results.
- Look at using a Query (

http://stackoverflow.com/questions/5872215/how-do-i-add-facts-to-working-memory-at-runtime-in-the-drools-drl-and-retrieve-t
)

With kind regards,

Mike

On 2 May 2012 10:39, stelomax stephen.lo...@mattelli.com wrote:

Hi,

Please bear with me, I am relatively new to the world of Drools and have a
question. I am hoping it will be a simple issue.

First let me frame my planned implementation at a high level. I am hoping
to use Drools as a real time service enabled quote validation tool.

Facts representing products and attributes will be loaded into a stateful
knowledge session upon boot (using a piece of Java that loads these as
facts
from our product DB).

The front-end application will allow users to build up quotes consisting of
quote lines that make references to these products. Once the quote is
built
they will press a Validate button. This will call a webservice that
will:

1) Insert the quote details as facts into the knowledge session
2) Run a rule flow to validate the quote against the product facts
3) The rules will insert validation results as facts tagged against the
quote
4) QUERY for the validation results
5) Retract the facts for the quote (inc validation results)
6) Send the validation results back as a response to the webservice call

My first question is how to implement step 4 -- how to physically query
for
the validation results pertaining to that specific quote. Any help here
would be greatly appreciated.

My second question relates to concurrency. As this is a quote validation
tool there will be multiple users validating quotes so we will get
concurrent validation requests.

What is the recommended manner of dealing with concurrent rule requests
within a stateful knowledge session. If 2 people attempt to validate a
different quote at the same time we will have two quotes within the
knowledge session together with all of the product facts. Is drools
capable
of running two concurrent rule flows against the knowledge session, each
referencing a different quote or would we need to instantiate 2 knowledge
sessions, or even deal with the matter in a serial manner placing the 2nd
quote validation flow on hold until the first completes?

Any help/pointers would be great. I am hoping someone out there has
attempted to use Drools in a similar manner :)

Many Thanks

Ste

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Re: [rules-users] Query for a fact, and concurrent rule execution

2012-05-02 Thread Stephen Lomax

Hi Mike,

Each quote does not enrich the session, we were actively looking to remove the 
quote at the end of the session to prevent it growing as we were just comparing 
the quote to the core product attribute facts.

What is the performance hit in launching a Stateful knowledge session with say 
10,000 facts, would it make the web service call slow?

Thanks very much for the help on the query also…we will look into that.

Kind Regards

Ste

On 2 May 2012, at 11:31, Michael Anstis wrote:

 Does each quote validation exercise enrich the StatefulKnowledgeSession with 
 other facts that could influence validation of other quotes?
 
 If not probably using a StatefulKnowledgeSession per HTTP request might be 
 more simple (with the KnowledgeBase as an application scoped variable).
 
 Regarding retrieval of results, there are a couple of options that spring to 
 mind:-
 Look at using a Global to collate results.
 Look at using a Query 
 (http://stackoverflow.com/questions/5872215/how-do-i-add-facts-to-working-memory-at-runtime-in-the-drools-drl-and-retrieve-t)
 With kind regards,
 
 Mike
 
 On 2 May 2012 10:39, stelomax stephen.lo...@mattelli.com wrote:
 Hi,
 
 Please bear with me, I am relatively new to the world of Drools and have a
 question.  I am hoping it will be a simple issue.
 
 First let me frame my planned implementation at a high level.  I am hoping
 to use Drools as a real time service enabled quote validation tool.
 
 Facts representing products and attributes will be loaded into a stateful
 knowledge session upon boot (using a piece of Java that loads these as facts
 from our product DB).
 
 The front-end application will allow users to build up quotes consisting of
 quote lines that make references to these products.  Once the quote is built
 they will press a Validate button.  This will call a webservice that will:
 
 1) Insert the quote details as facts into the knowledge session
 2) Run a rule flow to validate the quote against the product facts
 3) The rules will insert validation results as facts tagged against the
 quote
 4) QUERY for the validation results
 5) Retract the facts for the quote (inc validation results)
 6) Send the validation results back as a response to the webservice call
 
 My first question is how to implement step 4 -- how to physically query for
 the validation results pertaining to that specific quote.  Any help here
 would be greatly appreciated.
 
 My second question relates to concurrency.  As this is a quote validation
 tool there will be multiple users validating quotes so we will get
 concurrent validation requests.
 
 What is the recommended manner of dealing with concurrent rule requests
 within a stateful knowledge session.  If 2 people attempt to validate a
 different quote at the same time we will have two quotes within the
 knowledge session together with all of the product facts.  Is drools capable
 of running two concurrent rule flows against the knowledge session, each
 referencing a different quote or would we need to instantiate 2 knowledge
 sessions, or even deal with the matter in a serial manner placing the 2nd
 quote validation flow on hold until the first completes?
 
 Any help/pointers would be great.  I am hoping someone out there has
 attempted to use Drools in a similar manner :)
 
 Many Thanks
 
 Ste
 
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Re: [rules-users] Query for a fact, and concurrent rule execution

2012-05-02 Thread Michael Anstis

That's a possibility, but it'd depend on your rules.

As a thought, you could serialise the initialised StatelessKnowledgeSession
into a byte[] (cached at application scope) and deserialise with each
web-service call.

I would wait to see if Mark Proctor, Edson Tirelli or community members
have other thoughts on use of a single StatefulKnowledgeSession.

IIRC it is meant to be thread-safe but think people have reported problems
in the past. Recently:
http://lists.jboss.org/pipermail/rules-dev/2012-February/003857.html

With kind regards,

Mike

On 2 May 2012 11:58, Stephen Lomax stephen.lo...@mattelli.com wrote:

 Hi Mike,

 Each quote does not enrich the session, we were actively looking to remove
 the quote at the end of the session to prevent it growing as we were just
 comparing the quote to the core product attribute facts.

 What is the performance hit in launching a Stateful knowledge session with
 say 10,000 facts, would it make the web service call slow?

 Thanks very much for the help on the query also…we will look into that.

 Kind Regards

 Ste

 On 2 May 2012, at 11:31, Michael Anstis wrote:

 Does each quote validation exercise enrich the StatefulKnowledgeSession
 with other facts that could influence validation of other quotes?

 If not probably using a StatefulKnowledgeSession per HTTP request might be
 more simple (with the KnowledgeBase as an application scoped variable).

 Regarding retrieval of results, there are a couple of options that spring
 to mind:-

- Look at using a Global to collate results.
- Look at using a Query (

 http://stackoverflow.com/questions/5872215/how-do-i-add-facts-to-working-memory-at-runtime-in-the-drools-drl-and-retrieve-t
)

 With kind regards,

 Mike

 On 2 May 2012 10:39, stelomax stephen.lo...@mattelli.com wrote:

 Hi,

 Please bear with me, I am relatively new to the world of Drools and have a
 question.  I am hoping it will be a simple issue.

 First let me frame my planned implementation at a high level.  I am hoping
 to use Drools as a real time service enabled quote validation tool.

 Facts representing products and attributes will be loaded into a stateful
 knowledge session upon boot (using a piece of Java that loads these as
 facts
 from our product DB).

 The front-end application will allow users to build up quotes consisting
 of
 quote lines that make references to these products.  Once the quote is
 built
 they will press a Validate button.  This will call a webservice that
 will:

 1) Insert the quote details as facts into the knowledge session
 2) Run a rule flow to validate the quote against the product facts
 3) The rules will insert validation results as facts tagged against the
 quote
 4) QUERY for the validation results
 5) Retract the facts for the quote (inc validation results)
 6) Send the validation results back as a response to the webservice call

 My first question is how to implement step 4 -- how to physically query
 for
 the validation results pertaining to that specific quote.  Any help here
 would be greatly appreciated.

 My second question relates to concurrency.  As this is a quote validation
 tool there will be multiple users validating quotes so we will get
 concurrent validation requests.

 What is the recommended manner of dealing with concurrent rule requests
 within a stateful knowledge session.  If 2 people attempt to validate a
 different quote at the same time we will have two quotes within the
 knowledge session together with all of the product facts.  Is drools
 capable
 of running two concurrent rule flows against the knowledge session, each
 referencing a different quote or would we need to instantiate 2 knowledge
 sessions, or even deal with the matter in a serial manner placing the 2nd
 quote validation flow on hold until the first completes?

 Any help/pointers would be great.  I am hoping someone out there has
 attempted to use Drools in a similar manner :)

 Many Thanks

 Ste

 --
 View this message in context:
 http://drools.46999.n3.nabble.com/Query-for-a-fact-and-concurrent-rule-execution-tp3954737.html
 Sent from the Drools: User forum mailing list archive at Nabble.com.
 ___
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 rules-users mailing list
 rules-users@lists.jboss.org
 https://lists.jboss.org/mailman/listinfo/rules-users



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Re: [rules-users] Query for a fact, and concurrent rule execution

2012-05-02 Thread Stephen Lomax

Hi Mike,

Many thanks for that..we had previously thought of serialising to file but
thought the purpose of the StatefulKnowledgeSession was to keep it live in
memory continuously, rather than instantiating a new session with each web
service call.

My concern is that if we instantiate a new session with each web service call
the memory required will increase massively (if we have many concurrent
requests). Is there a way of serving multiple concurrent requests against the
same session to remove that concern.

Many thanks for your help with this..it is very much appreciated.

Ste

.
On 2 May 2012, at 12:08, Michael Anstis wrote:

That's a possibility, but it'd depend on your rules.

As a thought, you could serialise the initialised StatelessKnowledgeSession
into a byte[] (cached at application scope) and deserialise with each
web-service call.

I would wait to see if Mark Proctor, Edson Tirelli or community members have
other thoughts on use of a single StatefulKnowledgeSession.

IIRC it is meant to be thread-safe but think people have reported problems in
the past. Recently:
http://lists.jboss.org/pipermail/rules-dev/2012-February/003857.html

With kind regards,

Mike

On 2 May 2012 11:58, Stephen Lomax stephen.lo...@mattelli.com wrote:
Hi Mike,

Each quote does not enrich the session, we were actively looking to remove
the quote at the end of the session to prevent it growing as we were just
comparing the quote to the core product attribute facts.

What is the performance hit in launching a Stateful knowledge session with
say 10,000 facts, would it make the web service call slow?

Thanks very much for the help on the query also…we will look into that.

Kind Regards

Ste

On 2 May 2012, at 11:31, Michael Anstis wrote:

Does each quote validation exercise enrich the StatefulKnowledgeSession with
other facts that could influence validation of other quotes?

If not probably using a StatefulKnowledgeSession per HTTP request might be
more simple (with the KnowledgeBase as an application scoped variable).

Regarding retrieval of results, there are a couple of options that spring to
mind:-
Look at using a Global to collate results.
Look at using a Query
(http://stackoverflow.com/questions/5872215/how-do-i-add-facts-to-working-memory-at-runtime-in-the-drools-drl-and-retrieve-t)
With kind regards,

Mike

On 2 May 2012 10:39, stelomax stephen.lo...@mattelli.com wrote:
Hi,

Please bear with me, I am relatively new to the world of Drools and have a
question. I am hoping it will be a simple issue.

First let me frame my planned implementation at a high level. I am hoping
to use Drools as a real time service enabled quote validation tool.

Facts representing products and attributes will be loaded into a stateful
knowledge session upon boot (using a piece of Java that loads these as facts
from our product DB).

The front-end application will allow users to build up quotes consisting of
quote lines that make references to these products. Once the quote is built
they will press a Validate button. This will call a webservice that will:

My first question is how to implement step 4 -- how to physically query for
the validation results pertaining to that specific quote. Any help here
would be greatly appreciated.

My second question relates to concurrency. As this is a quote validation
tool there will be multiple users validating quotes so we will get
concurrent validation requests.

What is the recommended manner of dealing with concurrent rule requests
within a stateful knowledge session. If 2 people attempt to validate a
different quote at the same time we will have two quotes within the
knowledge session together with all of the product facts. Is drools capable
of running two concurrent rule flows against the knowledge session, each
referencing a different quote or would we need to instantiate 2 knowledge
sessions, or even deal with the matter in a serial manner placing the 2nd
quote validation flow on hold until the first completes?

Any help/pointers would be great. I am hoping someone out there has
attempted to use Drools in a similar manner :)

Many Thanks

Ste

Re: [rules-users] Query for a fact, and concurrent rule execution

2012-05-02 Thread GPatel

I would suggest making your service stateless and run the service in 
multiple JVMs to alleviate performance concerns. You will be able to scale 
and also not have to worry about cramming everything into a 
StatefulKnowledgeSession and worry abt thead-safety.

From:   Stephen Lomax stephen.lo...@mattelli.com
To: Rules Users List rules-users@lists.jboss.org, 
Date:   05/02/2012 04:28 AM
Subject:Re: [rules-users] Query for a fact, and concurrent rule 
execution
Sent by:rules-users-boun...@lists.jboss.org

Hi Mike,

Many thanks for that..we had previously thought of serialising to file but 
thought the purpose of the StatefulKnowledgeSession was to keep it live in 
memory continuously, rather than instantiating a new session with each web 
service call.

My concern is that if we instantiate a new session with each web service 
call the memory required will increase massively (if we have many 
concurrent requests).  Is there a way of serving multiple concurrent 
requests against the same session to remove that concern.

Many thanks for your help with this..it is very much appreciated.

Ste

.
On 2 May 2012, at 12:08, Michael Anstis wrote:

That's a possibility, but it'd depend on your rules.

As a thought, you could serialise the initialised 
StatelessKnowledgeSession into a byte[] (cached at application scope) and 
deserialise with each web-service call.

I would wait to see if Mark Proctor, Edson Tirelli or community members 
have other thoughts on use of a single StatefulKnowledgeSession.

IIRC it is meant to be thread-safe but think people have reported problems 
in the past. Recently: 
http://lists.jboss.org/pipermail/rules-dev/2012-February/003857.html

With kind regards,

Mike

On 2 May 2012 11:58, Stephen Lomax stephen.lo...@mattelli.com wrote:
Hi Mike,

Each quote does not enrich the session, we were actively looking to remove 
the quote at the end of the session to prevent it growing as we were just 
comparing the quote to the core product attribute facts.

What is the performance hit in launching a Stateful knowledge session with 
say 10,000 facts, would it make the web service call slow?

Thanks very much for the help on the query also…we will look into that.

Kind Regards

Ste

On 2 May 2012, at 11:31, Michael Anstis wrote:

Does each quote validation exercise enrich the StatefulKnowledgeSession 
with other facts that could influence validation of other quotes?

If not probably using a StatefulKnowledgeSession per HTTP request might be 
more simple (with the KnowledgeBase as an application scoped variable).

Regarding retrieval of results, there are a couple of options that spring 
to mind:-
Look at using a Global to collate results.
Look at using a Query (
http://stackoverflow.com/questions/5872215/how-do-i-add-facts-to-working-memory-at-runtime-in-the-drools-drl-and-retrieve-t
)
With kind regards,

Mike

On 2 May 2012 10:39, stelomax stephen.lo...@mattelli.com wrote:
Hi,

Please bear with me, I am relatively new to the world of Drools and have a
question.  I am hoping it will be a simple issue.

First let me frame my planned implementation at a high level.  I am hoping
to use Drools as a real time service enabled quote validation tool.

Facts representing products and attributes will be loaded into a stateful
knowledge session upon boot (using a piece of Java that loads these as 
facts
from our product DB).

The front-end application will allow users to build up quotes consisting 
of
quote lines that make references to these products.  Once the quote is 
built
they will press a Validate button.  This will call a webservice that 
will:

1) Insert the quote details as facts into the knowledge session
2) Run a rule flow to validate the quote against the product facts
3) The rules will insert validation results as facts tagged against the
quote
4) QUERY for the validation results
5) Retract the facts for the quote (inc validation results)
6) Send the validation results back as a response to the webservice call

My first question is how to implement step 4 -- how to physically query 
for
the validation results pertaining to that specific quote.  Any help here
would be greatly appreciated.

My second question relates to concurrency.  As this is a quote validation
tool there will be multiple users validating quotes so we will get
concurrent validation requests.

What is the recommended manner of dealing with concurrent rule requests
within a stateful knowledge session.  If 2 people attempt to validate a
different quote at the same time we will have two quotes within the
knowledge session together with all of the product facts.  Is drools 
capable
of running two concurrent rule flows against the knowledge session, each
referencing a different quote or would we need to instantiate 2 knowledge
sessions, or even deal with the matter in a serial manner placing the 2nd
quote validation flow on hold until the first completes?

Any help/pointers would be great.  I am hoping someone

Re: [rules-users] Query for a fact, and concurrent rule execution

2012-05-02 Thread Wolfgang Laun

Loading a stateless knowledge session with ~10k facts and the one (or
few) transaction fact(s) for a single transaction isn't economic.

I'd benchmark the costs for inserting the transaction fact(s) into a
statefeul session, run fireAllRules(), returning the result and
removing the debris in a thread. This should give you a good
indication how many of these you can do per second, and the potential
delay for concurrent requests when transactions are done in turn.

-W

On 02/05/2012, gpa...@tsys.com gpa...@tsys.com wrote:
I would suggest making your service stateless and run the service in
multiple JVMs to alleviate performance concerns. You will be able to scale
and also not have to worry about cramming everything into a
StatefulKnowledgeSession and worry abt thead-safety.

From: Stephen Lomax stephen.lo...@mattelli.com
To: Rules Users List rules-users@lists.jboss.org,
Date: 05/02/2012 04:28 AM
Subject:Re: [rules-users] Query for a fact, and concurrent rule
execution
Sent by:rules-users-boun...@lists.jboss.org

Hi Mike,

My concern is that if we instantiate a new session with each web service
call the memory required will increase massively (if we have many
concurrent requests). Is there a way of serving multiple concurrent
requests against the same session to remove that concern.

Many thanks for your help with this..it is very much appreciated.

Ste

.
On 2 May 2012, at 12:08, Michael Anstis wrote:

That's a possibility, but it'd depend on your rules.

As a thought, you could serialise the initialised
StatelessKnowledgeSession into a byte[] (cached at application scope) and
deserialise with each web-service call.

I would wait to see if Mark Proctor, Edson Tirelli or community members
have other thoughts on use of a single StatefulKnowledgeSession.

IIRC it is meant to be thread-safe but think people have reported problems
in the past. Recently:
http://lists.jboss.org/pipermail/rules-dev/2012-February/003857.html

With kind regards,

Mike

On 2 May 2012 11:58, Stephen Lomax stephen.lo...@mattelli.com wrote:
Hi Mike,

What is the performance hit in launching a Stateful knowledge session with
say 10,000 facts, would it make the web service call slow?

Thanks very much for the help on the query also…we will look into that.

Kind Regards

Ste

On 2 May 2012, at 11:31, Michael Anstis wrote:

Does each quote validation exercise enrich the StatefulKnowledgeSession
with other facts that could influence validation of other quotes?

If not probably using a StatefulKnowledgeSession per HTTP request might be
more simple (with the KnowledgeBase as an application scoped variable).

Regarding retrieval of results, there are a couple of options that spring
to mind:-
Look at using a Global to collate results.
Look at using a Query (
http://stackoverflow.com/questions/5872215/how-do-i-add-facts-to-working-memory-at-runtime-in-the-drools-drl-and-retrieve-t
)
With kind regards,

Mike

On 2 May 2012 10:39, stelomax stephen.lo...@mattelli.com wrote:
Hi,

Please bear with me, I am relatively new to the world of Drools and have a
question. I am hoping it will be a simple issue.

First let me frame my planned implementation at a high level. I am hoping
to use Drools as a real time service enabled quote validation tool.

Facts representing products and attributes will be loaded into a stateful
knowledge session upon boot (using a piece of Java that loads these as
facts
from our product DB).

The front-end application will allow users to build up quotes consisting
of
quote lines that make references to these products. Once the quote is
built
they will press a Validate button. This will call a webservice that
will:

My first question is how to implement step 4 -- how to physically query
for
the validation results pertaining to that specific quote. Any help here
would be greatly appreciated.

My second question relates to concurrency. As this is a quote validation
tool there will be multiple users validating quotes so we will get
concurrent validation requests.

What is the recommended manner

Re: [rules-users] Query for a fact, and concurrent rule execution

2012-05-02 Thread Stephen Lomax

Hi Wolfgang

Thanks for the response.

We will build a quick environment with test facts and run a benchmark as you
suggest. If we can fire these through quick enough then this sounds like the
preferred approach.

Then my next issue will be how to allow users to insert product updates through
the day and release new price lists without impacting users calling the
validation service ;-/

Thanks for all the help

Ste

On 2 May 2012, at 17:09, Wolfgang Laun wrote:

Loading a stateless knowledge session with ~10k facts and the one (or
few) transaction fact(s) for a single transaction isn't economic.

-W

Hi Mike,

My concern is that if we instantiate a new session with each web service
call the memory required will increase massively (if we have many
concurrent requests). Is there a way of serving multiple concurrent
requests against the same session to remove that concern.

Many thanks for your help with this..it is very much appreciated.

Ste

.
On 2 May 2012, at 12:08, Michael Anstis wrote:

That's a possibility, but it'd depend on your rules.

As a thought, you could serialise the initialised
StatelessKnowledgeSession into a byte[] (cached at application scope) and
deserialise with each web-service call.

I would wait to see if Mark Proctor, Edson Tirelli or community members
have other thoughts on use of a single StatefulKnowledgeSession.

IIRC it is meant to be thread-safe but think people have reported problems
in the past. Recently:
http://lists.jboss.org/pipermail/rules-dev/2012-February/003857.html

With kind regards,

Mike

On 2 May 2012 11:58, Stephen Lomax stephen.lo...@mattelli.com wrote:
Hi Mike,

What is the performance hit in launching a Stateful knowledge session with
say 10,000 facts, would it make the web service call slow?

Thanks very much for the help on the query also…we will look into that.

Kind Regards

Ste

On 2 May 2012, at 11:31, Michael Anstis wrote:

Does each quote validation exercise enrich the StatefulKnowledgeSession
with other facts that could influence validation of other quotes?

If not probably using a StatefulKnowledgeSession per HTTP request might be
more simple (with the KnowledgeBase as an application scoped variable).

Regarding retrieval of results, there are a couple of options that spring
to mind:-
Look at using a Global to collate results.
Look at using a Query (
http://stackoverflow.com/questions/5872215/how-do-i-add-facts-to-working-memory-at-runtime-in-the-drools-drl-and-retrieve-t
)
With kind regards,

Mike

On 2 May 2012 10:39, stelomax stephen.lo...@mattelli.com wrote:
Hi,

Please bear with me, I am relatively new to the world of Drools and have a
question. I am hoping it will be a simple issue.

First let me frame my planned implementation at a high level. I am hoping
to use Drools as a real time service enabled quote validation tool.

Facts representing products and attributes will be loaded into a stateful
knowledge session upon boot (using a piece of Java that loads these as
facts
from our product DB).

The front-end application will allow users to build up quotes consisting
of
quote lines that make references to these products. Once the quote is
built
they will press a Validate button. This will call a webservice that
will:

Re: [rules-users] Query for a fact, and concurrent rule execution

2012-05-02 Thread Greg Barton

Indeed!  And there's no reason you couldn't do the procedure below with 
multiple concurrent stateful sessions.  In fact, this might be the best way, as 
when the support facts change you could create new sessions and not disrupt the 
service. (And if the support facts are immutable and not changed by the rules 
you should share them between sessions in the same JVM, saving memory and DB 
load overhead.)

--- On Wed, 5/2/12, Wolfgang Laun wolfgang.l...@gmail.com wrote:

 From: Wolfgang Laun wolfgang.l...@gmail.com
 Subject: Re: [rules-users] Query for a fact, and concurrent rule execution
 To: Rules Users List rules-users@lists.jboss.org
 Date: Wednesday, May 2, 2012, 11:09 AM
 Loading a stateless knowledge session
 with ~10k facts and the one (or
 few) transaction fact(s) for a single transaction isn't
 economic.
 
 I'd benchmark the costs for inserting the transaction
 fact(s) into a
 statefeul session, run fireAllRules(), returning the result
 and
 removing the debris in a thread. This should give you a
 good
 indication how many of these you can do per second, and the
 potential
 delay for concurrent requests when transactions are done in
 turn.
 
 -W
 
 
 On 02/05/2012, gpa...@tsys.com
 gpa...@tsys.com
 wrote:
  I would suggest making your service stateless and run
 the service in
  multiple JVMs to alleviate performance concerns. You
 will be able to scale
  and also not have to worry about cramming everything
 into a
  StatefulKnowledgeSession and worry abt thead-safety.
 
 
 
  From:   Stephen Lomax stephen.lo...@mattelli.com
  To:     Rules Users List rules-users@lists.jboss.org,
  Date:   05/02/2012 04:28 AM
  Subject:        Re: [rules-users]
 Query for a fact, and concurrent rule
  execution
  Sent by:        rules-users-boun...@lists.jboss.org
 
 
 
  Hi Mike,
 
  Many thanks for that..we had previously thought of
 serialising to file but
  thought the purpose of the StatefulKnowledgeSession was
 to keep it live in
  memory continuously, rather than instantiating a new
 session with each web
  service call.
 
 
  My concern is that if we instantiate a new session with
 each web service
  call the memory required will increase massively (if we
 have many
  concurrent requests).  Is there a way of serving
 multiple concurrent
  requests against the same session to remove that
 concern.
 
  Many thanks for your help with this..it is very much
 appreciated.
 
  Ste
 
 
  .
  On 2 May 2012, at 12:08, Michael Anstis wrote:
 
  That's a possibility, but it'd depend on your rules.
 
  As a thought, you could serialise the initialised
  StatelessKnowledgeSession into a byte[] (cached at
 application scope) and
  deserialise with each web-service call.
 
  I would wait to see if Mark Proctor, Edson Tirelli or
 community members
  have other thoughts on use of a single
 StatefulKnowledgeSession.
 
  IIRC it is meant to be thread-safe but think people
 have reported problems
  in the past. Recently:
  http://lists.jboss.org/pipermail/rules-dev/2012-February/003857.html
 
  With kind regards,
 
  Mike
 
  On 2 May 2012 11:58, Stephen Lomax stephen.lo...@mattelli.com
 wrote:
  Hi Mike,
 
  Each quote does not enrich the session, we were
 actively looking to remove
  the quote at the end of the session to prevent it
 growing as we were just
  comparing the quote to the core product attribute
 facts.
 
  What is the performance hit in launching a Stateful
 knowledge session with
  say 10,000 facts, would it make the web service call
 slow?
 
  Thanks very much for the help on the query also…we
 will look into that.
 
  Kind Regards
 
  Ste
 
  On 2 May 2012, at 11:31, Michael Anstis wrote:
 
  Does each quote validation exercise enrich the
 StatefulKnowledgeSession
  with other facts that could influence validation of
 other quotes?
 
  If not probably using a StatefulKnowledgeSession per
 HTTP request might be
  more simple (with the KnowledgeBase as an application
 scoped variable).
 
  Regarding retrieval of results, there are a couple of
 options that spring
  to mind:-
  Look at using a Global to collate results.
  Look at using a Query (
  http://stackoverflow.com/questions/5872215/how-do-i-add-facts-to-working-memory-at-runtime-in-the-drools-drl-and-retrieve-t
  )
  With kind regards,
 
  Mike
 
  On 2 May 2012 10:39, stelomax stephen.lo...@mattelli.com
 wrote:
  Hi,
 
  Please bear with me, I am relatively new to the world
 of Drools and have a
  question.  I am hoping it will be a simple issue.
 
  First let me frame my planned implementation at a high
 level.  I am hoping
  to use Drools as a real time service enabled quote
 validation tool.
 
  Facts representing products and attributes will be
 loaded into a stateful
  knowledge session upon boot (using a piece of Java that
 loads these as
  facts
  from our product DB).
 
  The front-end application will allow users to build up
 quotes consisting
  of
  quote lines that make references to these
 products.  Once the quote is
  built

Re: [rules-users] query created in guvnor 5.3.0.final does not return expected results

2012-01-27 Thread Wolfgang Laun

You'd get this result even when there's no query with the name string
you use in the API call.
(1) Make sure that the name is correct.
(2) Make sure that there is a query with that name, e.g., by inspecting the
session's knowledge base at runtime.

-W

On 28/01/2012, vadlam sreeram.vadlam...@wellsfargo.com wrote:
I have created a query in guvnor 5.3 in a separate drl file as follows.

query get total Documents created

document : Document( )

end

I have several rules that create Documents as part of the ruleflow.

on the java side

ksession.fireAllRules(new RuleFilter()); // the rulefilter does not really
do anything except log the
//rules
executing

org.drools.runtime.rule.QueryResults results =
ksession.getQueryResults(get total Documents created);
System.out.println( we have + results.size() +
Documents );

I see that the returned results size is 0

but the following code returns the documents as expected.

Collection responseObjects = ksession.getObjects();

is there anything I am missing with respect to the query ? I use a ruleflow
. does the query need to be part of any of the ruleflowgroups within the
ruleflow ?

is there a way to know whether the query ran or not ?

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Re: [rules-users] query in drools expert :: rule language

2011-12-26 Thread bobbi_80

Hi luane,

thanks for that. Using the expression under eval() solves the problem.
I don't develop the objects I am applying the rule against. So I have to
make do with string datatype.

cheers.

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Re: [rules-users] query in drools expert :: rule language

2011-12-26 Thread Wolfgang Laun

The Drools version would be interesting, to raise a JIRA if it is  5.2.0.
-W

On 26 December 2011 09:05, bobbi_80 guruprasad_bo...@infosys.com wrote:

 Hi luane,

 thanks for that. Using the expression under eval() solves the problem.
 I don't develop the objects I am applying the rule against. So I have to
 make do with string datatype.

 cheers.

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Re: [rules-users] query in drools expert :: rule language

2011-12-26 Thread bobbi_80

sorry forgot to mention that part. I am using 5.3.0 final.

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Re: [rules-users] query in drools expert :: rule language

2011-12-25 Thread Wolfgang Laun

Starting with Drools 5.2, general boolean expressions
should work, but there were problems. Which version are
you using?

Why doesn't averageCPU have a numeric type? Then the comparison would be
straightforward (and most efficient).

To be on the safe side with String, use
   $cpuUsage : cpuTracker(
  eval( Integer.parseInt($cpuUsage.getAverageCPU())  60 ) )

-W

On 26 December 2011 06:50, bobbi_80 guruprasad_bo...@infosys.com wrote:

 Hi ,

 I want to know if there is any way I can evaluate a string in rule
 language.
 Here is what I am doing

 DroolsTest.java has a class as follows.

 DroolsTest.java

public static class cpuTracker{

private String machinename;
private String averageCPU;
}
 I want to set a rule in sample.drl such that if the averageCPU is greater
 than 80 an action is taken.

 Sample.drl
 rule High CPU Usage
when
$cpuUsage : cpuTracker( Integer.parseInt(averageCPU)  60 )
then
System.out.println(CPU usage is very high!!);
 end

 The compiler throws the following error  *no viable alternative at
 averageCPU for rule High CPu usage*.
 I am unable to convert string to int using Inetger.parseInt(). Any idea why
 it is throwing me an error and any help with rule language syntax that I
 can
 get online? Can't find all the answers from

 http://docs.jboss.org/drools/release/5.2.0.Final/drools-expert-docs/html_single/index.html

 Any help is highly appreciated.

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Re: [rules-users] Query in stateless knowledge session - SOLVED

2011-08-01 Thread Heijink, Hank

Mark,

Thanks for your help! I was finally able to test, and that totally worked. I 
was confused by example 3.37 (4.37 in the Drools 5.2.0 docs). The key point I 
missed must be that newStartProcess causes all the rules to fire. Well, at 
least I was right about it being something simple. :-)

Best,
Hank

On Jul 31, 2011, at 12:47 PM, Mark Proctor wrote:

 On 31/07/2011 17:45, Mark Proctor wrote:
 
 On 31/07/2011 17:25, Heijink, Hank wrote:
 
 Aha! I missed the line about the dispose. That makes a lot of sense. What I 
 don't understand is why the example 3.37 in the docs would work. If I 
 understand what you're saying, it shouldn't. 
 It should work, as long as the query is executed as part of the same execute 
 batch. We have unit tests f or that too somewhere.
 ok I see the problem. Your rules will not fire until the all the command 
 shave been executed. i.e. the implicit fireAllRules() is once all commands 
 have been executed. Which means the query will be invoked before your rule 
 fires to insert the object.
 
 Instead you need to add the FireAllRules command before executing the query.
 
 Mark
 
 mark
 
 Thanks!
 Hank
 
 Sent from my iPhone
 
 On Jul 30, 2011, at 8:27 AM, Wolfgang Laun wolfgang.l...@gmail.com 
 wrote:
 
 StatelessKnowledgeSession.execute(...) executes the command(s) and finally 
 calls dispose() on the session. Use a stateful session or a global (filled 
 with a low-salience rule) or  -  simply use the getObjects command.
 -W
 
 On 29 July 2011 22:47, Heijink, Hank heij...@audible.com wrote:
 Hi all,
 
 I'm new to Drools, so please excuse me if I'm asking about the 
 obvious--it's certainly not obvious to me. The problem is this: I use a 
 stateless knowledge session where a list of facts is inserted. The rules 
 that fire create new facts, and after all the rules have fired, I'd like 
 to obtain a list of all the facts (the old and the new). The best way 
 seemed to use a query. I'm using Drools 5.1 on Linux.
 
 The logger shows me that the BadgeState object is created, but the query 
 returns an empty list. I've searched the documentation, which suggests 
 that I'm doing it right 
 (http://drools.herod.net/drools-expert/html/ch03.html#d0e1956, example 
 3.37), the archives of this mailinglist, and the web, so far without 
 success.
 
 Clearly, I'm missing something, and I have the nagging feeling that it's 
 something simple...
 
 Any help is much appreciated!
 
 Best,
 Hank
 
 
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Re: [rules-users] Query in stateless knowledge session returns no results

2011-07-31 Thread Heijink, Hank

Aha! I missed the line about the dispose. That makes a lot of sense. What I 
don't understand is why the example 3.37 in the docs would work. If I 
understand what you're saying, it shouldn't.

Thanks!
Hank

Sent from my iPhone

On Jul 30, 2011, at 8:27 AM, Wolfgang Laun 
wolfgang.l...@gmail.commailto:wolfgang.l...@gmail.com wrote:

StatelessKnowledgeSession.execute(...) executes the command(s) and finally 
calls dispose() on the session. Use a stateful session or a global (filled with 
a low-salience rule) or  -  simply use the getObjects command.
-W

On 29 July 2011 22:47, Heijink, Hank 
mailto:heij...@audible.comheij...@audible.commailto:heij...@audible.com 
wrote:
Hi all,

I'm new to Drools, so please excuse me if I'm asking about the obvious--it's 
certainly not obvious to me. The problem is this: I use a stateless knowledge 
session where a list of facts is inserted. The rules that fire create new 
facts, and after all the rules have fired, I'd like to obtain a list of all the 
facts (the old and the new). The best way seemed to use a query. I'm using 
Drools 5.1 on Linux.
This is part of my .drl file (without the imports):

rule create badge
when
   Event ( eventType == EventType.SOME_EVENT_TYPE )
   not BadgeState ( identifier == badge )
then
   insert( new BadgeState(badge) );
end

query all badges
   aBadge : BadgeState()
end

This is the Java code:

   StatelessKnowledgeSession ksession = 
StatsKnowledgeBase.getKnowledgeBase().newStatelessKnowledgeSession();

   // Create a list of share events
   ArrayListEvent events = new ArrayListEvent();
   Date now = new Date();
   MobileDevice aDevice = new MobileDevice(uniqueId, 
deviceType);
   for (int i = 0; i  5; i++) {
   Event anEvent = new Event.Builder(now, aDevice, 
aCustomer, EventType.SOME_EVENT_TYPE).build();
   events.add(anEvent);
   }

   // Create the query for the badges
   ListCommand commands = new ArrayListCommand();
   commands.add(CommandFactory.newInsertElements(events));
   commands.add(CommandFactory.newQuery(all badges, all badges));

   // Feed the events into Drools
   KnowledgeRuntimeLogger logger = 
KnowledgeRuntimeLoggerFactory.newConsoleLogger(ksession);
   ExecutionResults results = ksession.execute( 
CommandFactory.newBatchExecution(commands) );
   NativeQueryResults queryResults = 
(NativeQueryResults)results.getValue(all badges);

// At this point, queryResults is empty.

   logger.close();

   // Get a list of badges
   ListBadgeState badges = new ArrayListBadgeState();
   for (IteratorQueryResultsRow i = queryResults.iterator(); 
i.hasNext(); ) {
   QueryResultsRow result = i.next();
   BadgeState obj = (BadgeState)result.get(aBadge);
   badges.add(obj);
   }

The logger shows me that the BadgeState object is created, but the query 
returns an empty list. I've searched the documentation, which suggests that I'm 
doing it right 
(http://drools.herod.net/drools-expert/html/ch03.html#d0e1956http://drools.herod.net/drools-expert/html/ch03.html#d0e1956,
 example 3.37), the archives of this mailinglist, and the web, so far without 
success.

Clearly, I'm missing something, and I have the nagging feeling that it's 
something simple...

Any help is much appreciated!

Best,
Hank


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Re: [rules-users] Query in stateless knowledge session returns no results

2011-07-31 Thread Mark Proctor


On 31/07/2011 17:25, Heijink, Hank wrote:
Aha! I missed the line about the dispose. That makes a lot of sense. 
What I don't understand is why the example 3.37 in the docs would 
work. If I understand what you're saying, it shouldn't.
It should work, as long as the query is executed as part of the same 
execute batch. We have unit tests f or that too somewhere.


mark


Thanks!
Hank

Sent from my iPhone

On Jul 30, 2011, at 8:27 AM, Wolfgang Laun wolfgang.l...@gmail.com 
mailto:wolfgang.l...@gmail.com wrote:


StatelessKnowledgeSession.execute(...) executes the command(s) and 
/finally calls dispose()/ on the session. Use a stateful session or a 
global (filled with a low-salience rule) or  -  simply use the 
getObjects command.

-W

On 29 July 2011 22:47, Heijink, Hank heij...@audible.com 
mailto:heij...@audible.com wrote:


Hi all,

I'm new to Drools, so please excuse me if I'm asking about the
obvious--it's certainly not obvious to me. The problem is this: I
use a stateless knowledge session where a list of facts is
inserted. The rules that fire create new facts, and after all the
rules have fired, I'd like to obtain a list of all the facts (the
old and the new). The best way seemed to use a query. I'm using
Drools 5.1 on Linux.
This is part of my .drl file (without the imports):

rule create badge
when
   Event ( eventType == EventType.SOME_EVENT_TYPE )
   not BadgeState ( identifier == badge )
then
   insert( new BadgeState(badge) );
end

query all badges
   aBadge : BadgeState()
end

This is the Java code:

   StatelessKnowledgeSession ksession =
StatsKnowledgeBase.getKnowledgeBase().newStatelessKnowledgeSession();

   // Create a list of share events
   ArrayListEvent events = new ArrayListEvent();
   Date now = new Date();
   MobileDevice aDevice = new
MobileDevice(uniqueId, deviceType);
   for (int i = 0; i  5; i++) {
   Event anEvent = new Event.Builder(now,
aDevice, aCustomer, EventType.SOME_EVENT_TYPE).build();
   events.add(anEvent);
   }

   // Create the query for the badges
   ListCommand commands = new ArrayListCommand();
 
 commands.add(CommandFactory.newInsertElements(events));

   commands.add(CommandFactory.newQuery(all badges,
all badges));

   // Feed the events into Drools
   KnowledgeRuntimeLogger logger =
KnowledgeRuntimeLoggerFactory.newConsoleLogger(ksession);
   ExecutionResults results = ksession.execute(
CommandFactory.newBatchExecution(commands) );
   NativeQueryResults queryResults =
(NativeQueryResults)results.getValue(all badges);

// At this point, queryResults is empty.

   logger.close();

   // Get a list of badges
   ListBadgeState badges = new ArrayListBadgeState();
   for (IteratorQueryResultsRow i =
queryResults.iterator(); i.hasNext(); ) {
   QueryResultsRow result = i.next();
   BadgeState obj =
(BadgeState)result.get(aBadge);
   badges.add(obj);
   }

The logger shows me that the BadgeState object is created, but
the query returns an empty list. I've searched the documentation,
which suggests that I'm doing it right
(http://drools.herod.net/drools-expert/html/ch03.html#d0e1956,
example 3.37), the archives of this mailinglist, and the web, so
far without success.

Clearly, I'm missing something, and I have the nagging feeling
that it's something simple...

Any help is much appreciated!

Best,
Hank


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Re: [rules-users] Query in stateless knowledge session returns no results

2011-07-31 Thread Mark Proctor


On 31/07/2011 17:45, Mark Proctor wrote:

On 31/07/2011 17:25, Heijink, Hank wrote:
Aha! I missed the line about the dispose. That makes a lot of sense. 
What I don't understand is why the example 3.37 in the docs would 
work. If I understand what you're saying, it shouldn't.
It should work, as long as the query is executed as part of the same 
execute batch. We have unit tests f or that too somewhere.
ok I see the problem. Your rules will not fire until the all the command 
shave been executed. i.e. the implicit fireAllRules() is once all 
commands have been executed. Which means the query will be invoked 
before your rule fires to insert the object.


Instead you need to add the FireAllRules command before executing the query.

Mark


mark


Thanks!
Hank

Sent from my iPhone

On Jul 30, 2011, at 8:27 AM, Wolfgang Laun wolfgang.l...@gmail.com 
mailto:wolfgang.l...@gmail.com wrote:


StatelessKnowledgeSession.execute(...) executes the command(s) and 
/finally calls dispose()/ on the session. Use a stateful session or 
a global (filled with a low-salience rule) or  -  simply use the 
getObjects command.

-W

On 29 July 2011 22:47, Heijink, Hank heij...@audible.com 
mailto:heij...@audible.com wrote:


Hi all,

I'm new to Drools, so please excuse me if I'm asking about the
obvious--it's certainly not obvious to me. The problem is this:
I use a stateless knowledge session where a list of facts is
inserted. The rules that fire create new facts, and after all
the rules have fired, I'd like to obtain a list of all the facts
(the old and the new). The best way seemed to use a query. I'm
using Drools 5.1 on Linux.
This is part of my .drl file (without the imports):

rule create badge
when
   Event ( eventType == EventType.SOME_EVENT_TYPE )
   not BadgeState ( identifier == badge )
then
   insert( new BadgeState(badge) );
end

query all badges
   aBadge : BadgeState()
end

This is the Java code:

   StatelessKnowledgeSession ksession =
StatsKnowledgeBase.getKnowledgeBase().newStatelessKnowledgeSession();

   // Create a list of share events
   ArrayListEvent events = new ArrayListEvent();
   Date now = new Date();
   MobileDevice aDevice = new
MobileDevice(uniqueId, deviceType);
   for (int i = 0; i  5; i++) {
   Event anEvent = new Event.Builder(now,
aDevice, aCustomer, EventType.SOME_EVENT_TYPE).build();
   events.add(anEvent);
   }

   // Create the query for the badges
   ListCommand commands = new ArrayListCommand();
 
 commands.add(CommandFactory.newInsertElements(events));

   commands.add(CommandFactory.newQuery(all badges,
all badges));

   // Feed the events into Drools
   KnowledgeRuntimeLogger logger =
KnowledgeRuntimeLoggerFactory.newConsoleLogger(ksession);
   ExecutionResults results = ksession.execute(
CommandFactory.newBatchExecution(commands) );
   NativeQueryResults queryResults =
(NativeQueryResults)results.getValue(all badges);

// At this point, queryResults is empty.

   logger.close();

   // Get a list of badges
   ListBadgeState badges = new
ArrayListBadgeState();
   for (IteratorQueryResultsRow i =
queryResults.iterator(); i.hasNext(); ) {
   QueryResultsRow result = i.next();
   BadgeState obj =
(BadgeState)result.get(aBadge);
   badges.add(obj);
   }

The logger shows me that the BadgeState object is created, but
the query returns an empty list. I've searched the
documentation, which suggests that I'm doing it right
(http://drools.herod.net/drools-expert/html/ch03.html#d0e1956,
example 3.37), the archives of this mailinglist, and the web, so
far without success.

Clearly, I'm missing something, and I have the nagging feeling
that it's something simple...

Any help is much appreciated!

Best,
Hank


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Re: [rules-users] Query in stateless knowledge session returns no results

2011-07-31 Thread Heijink, Hank

Thanks so much! I'll have a chance to test it tomorrow.

Hank

Sent from my iPhone

On Jul 31, 2011, at 12:48 PM, Mark Proctor 
mproc...@codehaus.orgmailto:mproc...@codehaus.org wrote:

On 31/07/2011 17:45, Mark Proctor wrote:
On 31/07/2011 17:25, Heijink, Hank wrote:
Aha! I missed the line about the dispose. That makes a lot of sense. What I 
don't understand is why the example 3.37 in the docs would work. If I 
understand what you're saying, it shouldn't.
It should work, as long as the query is executed as part of the same execute 
batch. We have unit tests f or that too somewhere.
ok I see the problem. Your rules will not fire until the all the command shave 
been executed. i.e. the implicit fireAllRules() is once all commands have been 
executed. Which means the query will be invoked before your rule fires to 
insert the object.

Instead you need to add the FireAllRules command before executing the query.

Mark

mark

Thanks!
Hank

Sent from my iPhone

On Jul 30, 2011, at 8:27 AM, Wolfgang Laun 
mailto:wolfgang.l...@gmail.comwolfgang.l...@gmail.commailto:wolfgang.l...@gmail.com
 wrote:

StatelessKnowledgeSession.execute(...) executes the command(s) and finally 
calls dispose() on the session. Use a stateful session or a global (filled with 
a low-salience rule) or  -  simply use the getObjects command.
-W

On 29 July 2011 22:47, Heijink, Hank 
mailto:heij...@audible.comheij...@audible.commailto:heij...@audible.com 
wrote:
Hi all,

I'm new to Drools, so please excuse me if I'm asking about the obvious--it's 
certainly not obvious to me. The problem is this: I use a stateless knowledge 
session where a list of facts is inserted. The rules that fire create new 
facts, and after all the rules have fired, I'd like to obtain a list of all the 
facts (the old and the new). The best way seemed to use a query. I'm using 
Drools 5.1 on Linux.
This is part of my .drl file (without the imports):

rule create badge
when
   Event ( eventType == EventType.SOME_EVENT_TYPE )
   not BadgeState ( identifier == badge )
then
   insert( new BadgeState(badge) );
end

query all badges
   aBadge : BadgeState()
end

This is the Java code:

   StatelessKnowledgeSession ksession = 
StatsKnowledgeBase.getKnowledgeBase().newStatelessKnowledgeSession();

   // Create a list of share events
   ArrayListEvent events = new ArrayListEvent();
   Date now = new Date();
   MobileDevice aDevice = new MobileDevice(uniqueId, 
deviceType);
   for (int i = 0; i  5; i++) {
   Event anEvent = new Event.Builder(now, aDevice, 
aCustomer, EventType.SOME_EVENT_TYPE).build();
   events.add(anEvent);
   }

   // Create the query for the badges
   ListCommand commands = new ArrayListCommand();
   commands.add(CommandFactory.newInsertElements(events));
   commands.add(CommandFactory.newQuery(all badges, all badges));

   // Feed the events into Drools
   KnowledgeRuntimeLogger logger = 
KnowledgeRuntimeLoggerFactory.newConsoleLogger(ksession);
   ExecutionResults results = ksession.execute( 
CommandFactory.newBatchExecution(commands) );
   NativeQueryResults queryResults = 
(NativeQueryResults)results.getValue(all badges);

// At this point, queryResults is empty.

   logger.close();

   // Get a list of badges
   ListBadgeState badges = new ArrayListBadgeState();
   for (IteratorQueryResultsRow i = queryResults.iterator(); 
i.hasNext(); ) {
   QueryResultsRow result = i.next();
   BadgeState obj = (BadgeState)result.get(aBadge);
   badges.add(obj);
   }

The logger shows me that the BadgeState object is created, but the query 
returns an empty list. I've searched the documentation, which suggests that I'm 
doing it right 
(http://drools.herod.net/drools-expert/html/ch03.html#d0e1956http://drools.herod.net/drools-expert/html/ch03.html#d0e1956,
 example 3.37), the archives of this mailinglist, and the web, so far without 
success.

Clearly, I'm missing something, and I have the nagging feeling that it's 
something simple...

Any help is much appreciated!

Best,
Hank


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Re: [rules-users] Query in stateless knowledge session returns no results

2011-07-30 Thread Wolfgang Laun

StatelessKnowledgeSession.execute(...) executes the command(s) and *finally
calls dispose()* on the session. Use a stateful session or a global (filled
with a low-salience rule) or  -  simply use the getObjects command.
-W

On 29 July 2011 22:47, Heijink, Hank heij...@audible.com wrote:

 Hi all,

 I'm new to Drools, so please excuse me if I'm asking about the
 obvious--it's certainly not obvious to me. The problem is this: I use a
 stateless knowledge session where a list of facts is inserted. The rules
 that fire create new facts, and after all the rules have fired, I'd like to
 obtain a list of all the facts (the old and the new). The best way seemed to
 use a query. I'm using Drools 5.1 on Linux.
 This is part of my .drl file (without the imports):

 rule create badge
 when
Event ( eventType == EventType.SOME_EVENT_TYPE )
not BadgeState ( identifier == badge )
 then
insert( new BadgeState(badge) );
 end

 query all badges
aBadge : BadgeState()
 end

 This is the Java code:

StatelessKnowledgeSession ksession =
 StatsKnowledgeBase.getKnowledgeBase().newStatelessKnowledgeSession();

// Create a list of share events
ArrayListEvent events = new ArrayListEvent();
Date now = new Date();
MobileDevice aDevice = new MobileDevice(uniqueId,
 deviceType);
for (int i = 0; i  5; i++) {
Event anEvent = new Event.Builder(now, aDevice,
 aCustomer, EventType.SOME_EVENT_TYPE).build();
events.add(anEvent);
}

// Create the query for the badges
ListCommand commands = new ArrayListCommand();
commands.add(CommandFactory.newInsertElements(events));
commands.add(CommandFactory.newQuery(all badges, all
 badges));

// Feed the events into Drools
KnowledgeRuntimeLogger logger =
 KnowledgeRuntimeLoggerFactory.newConsoleLogger(ksession);
ExecutionResults results = ksession.execute(
 CommandFactory.newBatchExecution(commands) );
NativeQueryResults queryResults =
 (NativeQueryResults)results.getValue(all badges);

 // At this point, queryResults is empty.

logger.close();

// Get a list of badges
ListBadgeState badges = new ArrayListBadgeState();
for (IteratorQueryResultsRow i = queryResults.iterator();
 i.hasNext(); ) {
QueryResultsRow result = i.next();
BadgeState obj = (BadgeState)result.get(aBadge);
badges.add(obj);
}

 The logger shows me that the BadgeState object is created, but the query
 returns an empty list. I've searched the documentation, which suggests that
 I'm doing it right (
 http://drools.herod.net/drools-expert/html/ch03.html#d0e1956, example
 3.37), the archives of this mailinglist, and the web, so far without
 success.

 Clearly, I'm missing something, and I have the nagging feeling that it's
 something simple...

 Any help is much appreciated!

 Best,
 Hank


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Re: [rules-users] Query query...

2010-11-09 Thread Esteban Aliverti

Are you setting the status attribute in the RHS of a rule? Are you updating
the facts after you modify them?

Best,



Esteban Aliverti
- Developer @ http://www.plugtree.com
- Blog @ http://ilesteban.wordpress.com


2010/11/9 Dennis Duggan den...@esptechnologies.com

  I have 2 types of objects in my knowledge base that I am trying to
 equate.  Equality is based on a number of different variables contained in
 the objects.  Once I find equal objects I set a status member in each to
 “Matched”, otherwise it will be “OneKnows” or “TwoKnows”.



 After I fire the rules I use queries that I call from Java code to get the
 three different types of objects.

 *query* OneFirmKnows

 oRecord : MyObject1( status==OneKnows )

 *end*



 *query* TwoKnows

 oRecord : MyObject2( status==TwoKnows )

 *end*



 *query* Matched

 oRecord : MyObject1( status==Matched )

 *end*



 Each query sends back all objects no matter what the status is.  The
 objects have a getStatus( ) method.  What am I doing wrong?



 Thanks!

 Dennis

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Re: [rules-users] Query query...

2010-11-09 Thread Wolfgang Laun

How are classes MyObject1 and MyObject2 related? Is there a field status
in each of them and/or in their common superclass?

-W

2010/11/9 Dennis Duggan den...@esptechnologies.com

  I have 2 types of objects in my knowledge base that I am trying to
 equate.  Equality is based on a number of different variables contained in
 the objects.  Once I find equal objects I set a status member in each to
 “Matched”, otherwise it will be “OneKnows” or “TwoKnows”.



 After I fire the rules I use queries that I call from Java code to get the
 three different types of objects.

 *query* OneFirmKnows

 oRecord : MyObject1( status==OneKnows )

 *end*



 *query* TwoKnows

 oRecord : MyObject2( status==TwoKnows )

 *end*



 *query* Matched

 oRecord : MyObject1( status==Matched )

 *end*



 Each query sends back all objects no matter what the status is.  The
 objects have a getStatus( ) method.  What am I doing wrong?



 Thanks!

 Dennis

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Re: [rules-users] Query query...

2010-11-09 Thread Dennis Duggan

I have a super interface, that both objects implement.

The matching rule looks like:
rule Match
when
$oRecord1 : MyObject1( )
$oRecord2 : MyObject2(RefID==$oRecord1. RefID )
  then
 $oRecord1.setStatus( Matched );
 $oRecord2.setStatus( Matched );
end

I can breakpoint right after running the query and I see objects with all 
statuses so the matching rule is firing correctly.

Thanks!
Dennis
Dennis Duggan
Principal Software Engineer, Software Engineering
ESP Technologies Corp. THE Buy-Side Solution
One Indian Head Plaza Suite 701, Nashua, NH 03060
603.324.2444 ext. 1304 Office |  603.324.2447 Fax
den...@esptechnologies.com

ESP Technologies, winner 2009 Red Herring North America 100 and 2008 Deloitte 
Technology Fast 500.
This e-mail and/or attachments may contain privileged, confidential or 
proprietary information.  Unintended recipients should notify the sender 
immediately and delete. Disclosure, copying, distribution or use of this e-mail 
or any attachment is prohibited. Brokerage services provided by Electronic 
Securities Processing (ESP) LLC. Member FINRA, SIPC. This is neither an offer 
or recommendation to buy or sell any security or other financial instrument.  
Email complia...@esptechnologies.com with questions regarding this disclosure.

From: Dennis Duggan
Sent: Tuesday, November 09, 2010 1:55 PM
To: 'rules-users@lists.jboss.org'
Subject: Query query...

I have 2 types of objects in my knowledge base that I am trying to equate.  
Equality is based on a number of different variables contained in the objects.  
Once I find equal objects I set a status member in each to Matched, otherwise 
it will be OneKnows or TwoKnows.

After I fire the rules I use queries that I call from Java code to get the 
three different types of objects.
query OneFirmKnows
oRecord : MyObject1( status==OneKnows )
end

query TwoKnows
oRecord : MyObject2( status==TwoKnows )
end

query Matched
oRecord : MyObject1( status==Matched )
end

Each query sends back all objects no matter what the status is.  The objects 
have a getStatus( ) method.  What am I doing wrong?

Thanks!
Dennis
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Re: [rules-users] Query query...

2010-11-09 Thread Wolfgang Laun

You don't call modify or update on $oRecord1/$oRecord2!
-W



2010/11/9 Dennis Duggan den...@esptechnologies.com

  I have a super interface, that both objects implement.



 The matching rule looks like:

 *rule* Match

 *when*

 $oRecord1 : MyObject1( )

 $oRecord2 : MyObject2(RefID==$oRecord1. RefID )

   *then*

  $oRecord1.setStatus( Matched );

  $oRecord2.setStatus( Matched );

 *end*



 I can breakpoint right after running the query and I see objects with all
 statuses so the matching rule is firing correctly.



 Thanks!
 Dennis

 Dennis Duggan

 Principal Software Engineer, Software Engineering

 ESP Technologies Corp. THE Buy-Side Solution**

 One Indian Head Plaza Suite 701, Nashua, NH 03060

 603.324.2444 ext. 1304 Office |  603.324.2447 Fax

 den...@esptechnologies.com



 *ESP Technologies, winner 2009 Red Herring North America 100 and 2008
 Deloitte Technology Fast 500*.**

 This e-mail and/or attachments may contain privileged, confidential or
 proprietary information.  Unintended recipients should notify the sender
 immediately and delete. Disclosure, copying, distribution or use of this
 e-mail or any attachment is prohibited. Brokerage services provided by
 Electronic Securities Processing (ESP) LLC. Member FINRA, SIPC. This is
 neither an offer or recommendation to buy or sell any security or other
 financial instrument.  Email complia...@esptechnologies.com with questions
 regarding this disclosure.



 *From:* Dennis Duggan
 *Sent:* Tuesday, November 09, 2010 1:55 PM
 *To:* 'rules-users@lists.jboss.org'
 *Subject:* Query query...



 I have 2 types of objects in my knowledge base that I am trying to equate.
 Equality is based on a number of different variables contained in the
 objects.  Once I find equal objects I set a status member in each to
 “Matched”, otherwise it will be “OneKnows” or “TwoKnows”.



 After I fire the rules I use queries that I call from Java code to get the
 three different types of objects.

 *query* OneFirmKnows

 oRecord : MyObject1( status==OneKnows )

 *end*



 *query* TwoKnows

 oRecord : MyObject2( status==TwoKnows )

 *end*



 *query* Matched

 oRecord : MyObject1( status==Matched )

 *end*



 Each query sends back all objects no matter what the status is.  The
 objects have a getStatus( ) method.  What am I doing wrong?



 Thanks!

 Dennis

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Re: [rules-users] Query about Drools

2010-11-01 Thread Michael Anstis

Hi,

1) Outside of Guvnor rules are normally defined in DRL (text files) or
spreadsheets (Decision Tables). There is an API to load these into
KnowledgeBases at runtime. Behind the covers Guvnor does much the same -
generating DRL from its internal structures that are compiled into
KnowledgeBases to be downloaded. Is XML essential or can DRL suffice? I
believe there is a proprietary XML format however I am uncertain how well
supported this is. I believe the plan is to migrate to RulesML at sometime.

2) You could look at using KnowledgeAgent which supports scanning and
retrieving Knowledge artefacts from a single (central) location. You could
also consider using a distributed cache in which serialisable KnowledgeBases
could be stored. I think there are other users that use Terracotta in a
clustered environment to support Drools but I don't know the detail.

With kind regards,

Mike

On 1 November 2010 09:38, sameer.bogawat sameer.boga...@gmail.com wrote:

I have a project where I am allowing users to create rules from the
application UI. Currently all the rules related info is stored in a
database
and the rules matching code is in Java. However this slows down the
application considerably and hence we are looking at using a third party
rules engine.

I have the following queries :

1. Is it possible to use the backend APIs (if any) to create/modify rules
in
XML files in Drools on the fly i.e. at runtime ? We do not want to use the
Guvnor UI to create/modify rules.

2. We would be using a clustered environment , so is there any readymade
webservice which will update the rules at one location (from where the
other
nodes can refer data).

Any help with the above queries would be of great help. Do let me know in
case you require extra information.

Thanks in Advance !
-Sameer
--
View this message in context:
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Re: [rules-users] Query about performance in using data as fact or using it as Global variable

2010-10-15 Thread Michael Anstis

I cannot tell from what you have posted; but without relating member to
company you run the risk of producing a Cartesian product of results which
would, no doubt, give you a performance problem.

rule Cartesian product
when
$c : Company()
$m : Member()
then
//Joined all Companies to all Members. Ouch!
end

rule Join 1
when
$c : Company()
$m : Member(company == $c)
then
//Nice
end

rule Join 2
when
$c : Company()
$m : Member() from $c.members
then
//Nice
end

Rule Join 2 should enable you to only insert Company's into working memory
too.


2010/10/15 Nikhil S. Kulkarni nikhil.kulka...@mastek.com

  Hi ,

 I am using drools 5.0 in application. I am facing
 performance issues. I am using drls, rule flows and rule templates.



 My scenario is as follows :-



 Consider there is list of 20 companies.

 There are about 2 members in each company.



 Now I have several rules in which condition is for specific member and
 specific company.



 e.g.



 rule 1

  when  comp : company

 and member : Members

 then

 ………

 End;



 So similarly I passed Member list and company list as fact. But it was time
 consuming process.



 So I have done one change.



 I kept only comp:company in when condition of rule as I explained above and
 declare member list as global .



 I created a function in rule in which I am iterating over member list and
 doing the same process.



 Now this is taking less time.



 Now my question is how efficient is this change.



 Though we say that when we write specific condition in rule then it will be
 fired only in that case.

 But when I use Agenda Event Listener class,

 I come to know one thing that it creates activation-created for all
 possible conditions then it will fire activation-Fired for specific
 condition

 And after that it will cancel all the activations.



 So as I reduced member level fact condition my time is reduced drastically
 and performance improved.





 So anybody can suggest me that whether I am on right track of improving
 time and performance or not ?



 Waiting for reply.





 *Thanks  Regards,*

 *Nikhil S. Kulkarni*

 * *





 MASTEK LTD.
 In the US, we're called MAJESCOMASTEK


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 and solely for the use of the intended person or entity to which it is 
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Re: [rules-users] Query about performance in using data as fact or using it as Global variable

2010-10-15 Thread Wolfgang Laun

For this sort of analysis one has to know
(1) whether one Member can be a member of a single company only, or whether
(s)he can be a member of more than one, too;
(2) (assuming it's N:1) whether is is possible to have a reference to the
company as a field in each Member object
(3) whether you can or cannot (for whatever reason) insert indovodual
Company objects as single facts into WM:
(4) whether you can or cannot (for whatever reason) insert individual Member
objects as single facts into WM:
(5) whether matching for an individual Member is possible by a unique
identification of that Member or whether it is only
possible in combination with the member's company (employee IDs are only
unique within a Company)

Best performance for rules where you have to search for a Member with
employeeId in a Company with name can be achieved
by s.th. like the rule shown below, where I assume that Member:Comp is N:1
and Member contains a reference to his/her Company:

rule
when
  LookFor( $comp : comp, $empId : empId )
  $c: Company( name == $comp )
  $m: Member( comp == $c, empId == $empId )
then ...

-W


2010/10/15 Nikhil S. Kulkarni nikhil.kulka...@mastek.com

  Hi ,

 I am using drools 5.0 in application. I am facing
 performance issues. I am using drls, rule flows and rule templates.



 My scenario is as follows :-



 Consider there is list of 20 companies.

 There are about 2 members in each company.



 Now I have several rules in which condition is for specific member and
 specific company.



 e.g.



 rule 1

  when  comp : company

 and member : Members

 then

 ………

 End;



 So similarly I passed Member list and company list as fact. But it was time
 consuming process.



 So I have done one change.



 I kept only comp:company in when condition of rule as I explained above and
 declare member list as global .



 I created a function in rule in which I am iterating over member list and
 doing the same process.



 Now this is taking less time.



 Now my question is how efficient is this change.



 Though we say that when we write specific condition in rule then it will be
 fired only in that case.

 But when I use Agenda Event Listener class,

 I come to know one thing that it creates activation-created for all
 possible conditions then it will fire activation-Fired for specific
 condition

 And after that it will cancel all the activations.



 So as I reduced member level fact condition my time is reduced drastically
 and performance improved.





 So anybody can suggest me that whether I am on right track of improving
 time and performance or not ?



 Waiting for reply.





 *Thanks  Regards,*

 *Nikhil S. Kulkarni*

 * *





 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 
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 and solely for the use of the intended person or entity to which it is 
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Re: [rules-users] Query on Performance Improvement in Drools 5 while dealing with huge data

2010-07-29 Thread senthij


correcting the format.
--
Hi There,
 
We are using Drools 5 in our project, the requirement was to have huge
database, the data is being fetched from DB and inserted into drools working
memory.
 
For eg:
Cell - 50k  
ExternalCell - 50k
CellRelation - 250 
 
Topology hiearchy:

 -Subnetwork  
- PLMN  (Contained in Subnetwork) 
 - RNC  (Contained in PLMN) 
   - Cells  (Contained in RNC) 
 
 
Problem statement:
Check if bidirectional relation not exist between cells in different
subnetwork.
 
How to prove?
Prove that,
First check:
- CellObA and ExternalCellObB in subnetwork 1, both are related using
CellRelationX.  - Unidirectional 
  note: CellObA will have ListString property contains all ExternalCellOb
names, so ExternalCellObB name should be part of List if
  there is an CellRelation relating CellObA and ExternalCellObB.
Second check:
- CellObB and ExternalCellObA in subnetwork 2, both are related using
CellRelationY.  - Unidirectional (inturn proves that bi-directional relation
exist)
  note: CellObB will have ListString property contains all ExternalCellOb
names, so similarly ExternalCellObA should be part of List if
  there is an CellRelation relating CellObB and ExternalCellObA.
 
 Check if there is missing/no relation exist between CellObB and
ExteranlCellObA.
 
 
Cell table has oneToMany relation to CellRelation table. We are using
eclipselink for ORM, since Cell and CellRelation tables are related, while
reteriving Cell, CellRelation are also part of the it (using fetch.type =
LAZY). Since Cell table is kind of master table, we are creating the
required objects by from cell entities and inserting the newly created
objects into working memory. 
 
 
Cell table contains master data and ExternalCell table contains proxy
(duplicate copy of master) data.
 
Mapping from Entities to Objects
Entity -  Objects
--
Cell-   CellOb
ExternalCell   -   ExternalCellOb
CellRelation   -   CellRelation
 
CellOb  ExternalCellOb contains following attributes which are used for
comparison. 
- mcc,mnc,rncId,cellId  and nodeId are all of type integer used for
comparsion.   
- mcc, mnc, rncId and cellId are used to uniquely identify CellOb and its
ExternalCellOb through object equality. These fours attributes are used in
overrided equals() and hashcode() method.
 
--
  
Rule file:
rule Cell Selection Rule
salience 50
dialect java
when
  $ucell:CellOb() from TopologyService.getInstance().getCellObs()
then
  insert($ucell);   // inserts each CellOb into working memory.
end
 
rule External Cell Selection Rule
salience 49
dialect java
when
  $extucell:ExternalCellOb() from
TopologyService.getInstance().getExternalCellObs()
then
  insert($extucell); // inserts each ExternalCellOb into working memory.
end
 
rule Bidirectional Relations Evaluation Rule
salience 10
dialect java
when
 //Takes ExternalCellObB from Subnetwork 1
  $extuccell : ExternalCellOb(subnetworkMgrId==1)  
 
 // Takes CellObA from Subnetwork 1, not matching cgiParam (is
mcc+mnc+rncId+cellId) of ExternalCellObB, and seeing if there is
CellRelation exist
 // between  ExternalCellObB and CellObA using contains check
  $cell :
CellObA(subnetworkMgrId==$extuccell.subnetworkMgrId,cgiParam!=$extuccell.cgiParam,adjacentCells
contains $extuccell.fdnReverse) 
 
 //Takes ExternalCellObA from Subnetwork 2, matching CellObA cgiParam (is
mcc+mnc+rncId+cellId) 
  $adjextcell : ExternalCellOb (subnetworkMgrId!=$cell.subnetworkMgrId,
cgiParam==$cell.cgiParam)
 
 //Takes CellObB from Subnetwork 2, matching ExternalCellObB, and seeing if
there is no CellRelation exist between CellObB and
 //ExternalCellObA
  $adjcell : CellOb ( subnetworkMgrId==$adjextcell.subnetworkMgrId,
cgiParam==$extuccell.cgiParam,adjacentCells 
not contains $adjextcell.fdnReverse)
then 
// FDN format looks like the one mentioned below.
//
SubNetwork=ROOT_OB,SubNetwork=1,Context=01,MElement=1,Rnc=1,Cell=RNC01-104 
  System.out.println(Missing Cell Relation from  + $cell.getFdn() +  to 
+ $adjcell.getFdn());  
end
--
 
Tried following and gave performance imporvements after each change:
- Initially, we use to check the following attributes individually, like
mcc, mnc, rncId and cellId but later we combined and it 
   gave some performance improvements.
- Used subnetworkId to  search CellOb/ExternalCellOb with in a appropriate
subnetwork.
- Java string search trick, cellNames are very lengthy but they vary at the
end of the string, so reverse the string and it improved in the 
  contains/not contains check in the List of strings.   
 
What we wanted to know is from Drools part any

Re: [rules-users] Query on loading facts dynamically

2010-06-30 Thread Wolfgang Laun

If you want to reward all students you'll have to have all students in WM,
at one time or other. Assuming that you aren't dealing with all the students
in China, it doesn't matter much how you do this.

Now as for a student's exams, there might be an advantage if you could
restrict the set of facts to those that are actually required to compute the
average of last 3 out of all. But to fetch just these, you'd have to know
some key (e.g., student+course) - but I don't see how you can construct that
without having the exam object with all its attributes, especially the date.

Regards
-W


2010/6/30 jobin wilson jobinwil...@gmail.com

 Hello List,

 I have a very basic question about inserting facts into the working memory
 dynamically.For firing the rules,we should be having all our facts in the
 working memory.In that case,How will we deal with the situation where the
 facts that we need for evaluation of a particular rule is dependent on the
 rule itself (needs to be brought it dynamically)?

 Say for example say i want to use rule engine to reward all students with
 average scores for all subjects  75 for the past 3 exams.

 The facts that i have are the Student objects  their Subject wise
 scores(one to many relation;one student to many exams  each exams having
 many subjects).
 I want the when condition to be satisfied for all students whose average
 scores for all subjects for the past 3 exams to be greater than 75
 and the consequence to be to just print out the name of the student.

 In this case,should i be loading all the student objects  each of their
 past exam scores in the whole system to find student objects satisfying this
 critera?
 Since i already know that the rule just need the average scores for just
 the past 3 exams for each student,wouldn't loading the whole facts be
 inefficient?
 Is there a way in which i can specify somehow how much of the facts needs
 to be loaded before firing the rule based on the rule itself?
 i mean a rule which is aware of the quantity of the facts on which it needs
 to work on(considering loading 3 facts versus 100 facts)?

 Thanks a lot in advance for all your inputs and suggestions on this.

 Thanks  Regards
 Jobin Wilson



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Re: [rules-users] Query on loading facts dynamically

2010-06-30 Thread jobin wilson

Thanks W for the quick responseyou are absolutely correct,to reward all
the students based on some criteria,all of them should be in WM.But the
average of last 3 out of all  75 should become a part of the reward
criteria and the challenge as you mentioned would be how to restrict the
exam facts to the ones which are relevant for evaluating this criteria.

Is there a concept of some kind of a rule pre-processor or an engine which
can identify the context of the rule and load the limited facts based on
that context?

Thanks  Regards
Jobin Wilson


2010/6/30 Wolfgang Laun wolfgang.l...@gmail.com

 If you want to reward all students you'll have to have all students in WM,
 at one time or other. Assuming that you aren't dealing with all the students
 in China, it doesn't matter much how you do this.

 Now as for a student's exams, there might be an advantage if you could
 restrict the set of facts to those that are actually required to compute the
 average of last 3 out of all. But to fetch just these, you'd have to know
 some key (e.g., student+course) - but I don't see how you can construct that
 without having the exam object with all its attributes, especially the date.

 Regards
 -W


 2010/6/30 jobin wilson jobinwil...@gmail.com

 Hello List,

 I have a very basic question about inserting facts into the working memory
 dynamically.For firing the rules,we should be having all our facts in the
 working memory.In that case,How will we deal with the situation where the
 facts that we need for evaluation of a particular rule is dependent on the
 rule itself (needs to be brought it dynamically)?

 Say for example say i want to use rule engine to reward all students with
 average scores for all subjects  75 for the past 3 exams.

 The facts that i have are the Student objects  their Subject wise
 scores(one to many relation;one student to many exams  each exams having
 many subjects).
 I want the when condition to be satisfied for all students whose average
 scores for all subjects for the past 3 exams to be greater than 75
 and the consequence to be to just print out the name of the student.

 In this case,should i be loading all the student objects  each of their
 past exam scores in the whole system to find student objects satisfying this
 critera?
 Since i already know that the rule just need the average scores for just
 the past 3 exams for each student,wouldn't loading the whole facts be
 inefficient?
 Is there a way in which i can specify somehow how much of the facts needs
 to be loaded before firing the rule based on the rule itself?
 i mean a rule which is aware of the quantity of the facts on which it
 needs to work on(considering loading 3 facts versus 100 facts)?

 Thanks a lot in advance for all your inputs and suggestions on this.

 Thanks  Regards
 Jobin Wilson



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Re: [rules-users] Query on performance when adding/removing rules

2009-11-24 Thread DeepakA


any suggestions regarding the impact on performance???



DeepakA wrote:
 
 We have a set of rules (lets call them old rules) running in our strategy
 server.
 A new requirement is that - the client can make calls to the server, at
 that point new rules need to be loaded in the workin memory (at run time),
 if the rules get executed then the rules need to be removed from the
 WorkinMemory (after the consequence section is executed)
 
 I would like to know if repeated adding and removing of rules in the
 working memory will lead to performance issues?
 
 i.e. when the new rules are added/removed the old-set-of rules will still
 be evaluated in the background, will this hamper performance?
 

-- 
View this message in context: 
http://old.nabble.com/Query-on-performance-when-adding-removing-rules-tp26475542p26493210.html
Sent from the drools - user mailing list archive at Nabble.com.

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Re: [rules-users] query or global

2008-07-28 Thread Ingomar Otter

what are disadvantages and advantages of the following  
possibillities to to

get access to working memory facts from outside:
Is there a reason why you want to use something other than queries?
 I would suggest to use queries _unless_ you have a definitive   
requirement that requires something else. Queries are easy and you get  
constraints for free.
Everything else is just work. ;-) If you need to use logicals, you  
also have to implement an event listener in your facts to track them   
properly.



Cheers
--I

Am 28.07.2008 um 15:15 schrieb thomas kukofka:


Hello again,

what are disadvantages and advantages of the following  
possibillities to to

get access to working memory facts from outside:


  - -uses a query:

in drl:

query queryname
   ...
end

in java code

queryResults results = workingMemory.getQueryResults( queryname );

  - -use globals that store facts:

global java.util.HashMap service
rule XY
   when
   f: FactX ()
   then
   ResultFact resultFact = new ResultFact();
   service.put(f.getName(), resultFact);
   insert(resultFact);
end


kind regards
tom
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Re: [rules-users] Query Problem

2007-11-18 Thread Ronald R. DiFrango

Mark,

I am certain that this is a bug.  In my rules, I was able to make it work
where I leave the Open lines on he agenda and he query does in fact pick
them up.

I wil see if I can create a small test case that demonstrates the problem.
What is the link to JIRA so I can log it.

Ron

On Nov 17, 2007 12:17 PM, Mark Proctor [EMAIL PROTECTED] wrote:

  Ronald R. DiFrango wrote:

 All,

 I have the following query:

 query Open RTV Lines
 line : DetailLine(status in (StatusConstants.OPEN,
 StatusConstants.PARTIALLY_MATCHED))
 end

 And what appears to be happening is it is only picking up those lines that
 are marked with StatusConstants.PARTIALLY_MATCHED and not those marked
 with StatusConstants.OPEN.

 Now here is the rub, if a line gets marked as StatusConstants.OPEN then it
 gets pulled off the agenda for further processing.  Could this be why it is
 not getting picked up by the query?

 The agenda  thas nothing to do with querries. This should work. If you
 believe its a bug, then please open a JIRA with a self contained executiable
 test.


 Ron

 --


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Re: [rules-users] query

2007-09-24 Thread Edson Tirelli

   As the error message states, you probably forgot to define a package name
in your DRL files.

[]s
Edson


2007/9/24, [EMAIL PROTECTED] [EMAIL PROTECTED]:

  Hi

 In one of my program i am getting the following erroe message


 Exception in thread main
 *org.drools.compiler.PackageBuilder$MissingPackageNameException*: Missing
 package name for rule package.

 at org.drools.compiler.PackageBuilder.validatePackageName(
 *PackageBuilder.java:294*)

 at org.drools.compiler.PackageBuilder.addPackage(
 *PackageBuilder.java:226*)

 at org.drools.compiler.PackageBuilder.addPackageFromDrl(
 *PackageBuilder.java:160*)

 at org.drools.compiler.RuleBaseLoader.loadFromReader(
 *RuleBaseLoader.java:38*)

 at stockoffer.BusinessLayer.loadRules(
 *BusinessLayer.java:47*)

 at stockoffer.BusinessLayer.evaluateStockPurchase(
 *BusinessLayer.java:60*)

 at stockoffer.Tempclass.main(
 *Tempclass.java:22*)



 So please send me the solution for this error.

 Thanks.

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  Software Engineer - JBoss Rules Core Developer
  Office: +55 11 3529-6000
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  JBoss, a division of Red Hat @ www.jboss.com
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Re: [rules-users] query regarding drl to xml conversion...

2007-04-11 Thread Mark Proctor


Niloy,

I suggest you make a drl first and then look at the AST it creates in 
memory and then make sure that the programmatic descr tree you are 
making matches that.


Mark
Niloy Debnath wrote:

hi,

  I'm going to convert a PackageDescr object which has the rules to 
XML file.I'm trying to convert it into xml using dump method of 
XmlDumper class. The problem with that is while the rest of the code 
is fine i cannot get the lhs part. There is no method in fact as far 
as i know to actually specify the lhs. The setLhs method does not help 
in this regard. I tried to construct all the parameters ususally 
specified in the lhs like the ColumnDescr object and FieldBinding 
object but there is no way to bind these to the PackageDescr object.
So the lhs is coming out as null while the rest of the code is fine 
...even the rhs..


I am attaching the code and the output again. please go through and 
advise.


 thanking you,

Niloy Debnath
student(comp sc  engg)



*
OUTPUT OF TEST2 :*
 
 
?xml version=1.0 encoding=UTF-8?

package name=org.drools.examples
xmlns=http://drools.org/drools-3.0;
xmlns:xs=http://www.w3.org/2001/XMLSchema-instance;
xs:schemaLocation=http://drools.org/drools-3.0 drools-3.0.xsd
import name=org.drools.examples.Hell.Message /
 
rule name=Hell

lhsnull
null
/lhsrhsSystem.out.println( message );m.setMessage( Goodbye cruel 
world  );m.setStatus( Message.GOODBYE );modify( m );/rhs

/rulerule name=Good
rule-attribute name=activation-group value=dekhajak /
lhsrule-attribute name=activation-group value=dekhajak /
rule-attribute name=activation-group value=dekhajak /
 
/lhsrhsSystem.out.println( message ); m.setMessage( message );/rhs

/rule
/package
no visitor implementation for : class 
org.drools.lang.descr.PatternDescr : 
[EMAIL PROTECTED]
no visitor implementation for : class 
org.drools.lang.descr.PatternDescr : 
[EMAIL PROTECTED]
no visitor implementation for : class 
org.drools.lang.descr.PatternDescr : 
[EMAIL PROTECTED]
no visitor implementation for : class 
org.drools.lang.descr.PatternDescr : 
[EMAIL PROTECTED]



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Re: [rules-users] query question

2007-02-20 Thread Mark Proctor


no
Kevin J. Schmidt wrote:

Can a query in a rules file be used in the LHS of another rule?



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