8:28 a.m.
Hi,
I am working on a system where I need to correlate few error conditions
happening in the network infrastructure. I have gone through the
documentation for Jboss rules engine (Drools) and I am planning to use
it for the correlation purpose.
Can anyone let me know a way in which I can get an object from
workingmemory in the "then" part of the rule? For e.g., I need the
following
rule "new error"
when
$error : Error (state == NEW_ERROR)
then
(search workingmemory if this error was already
registered)
if (found)
{
$errFromWorkingMemory.setLastTimestamp(currentTimestamp)
retract($error);
}
End
Thanks,
Ashfaq
12:10 p.m.
I think you may want to use a global here:
global ErrorMetaData errorMetadata;
rule "new error"
when
$error : Error (state == NEW_ERROR)
then
(search workingmemory if this error was already registered)
if (found)
{
errorMetadata.setLastTimestamp(currentTimestamp)
retract($error);
}
end
On 2/28/07, Framewala, Ashfaq Y <Ashfaq.Framewala(a)gs.com> wrote:
Hi,
I am working on a system where I need to correlate few error conditions
happening in the network infrastructure. I have gone through the
documentation for Jboss rules engine (Drools) and I am planning to use it
for the correlation purpose.
Can anyone let me know a way in which I can get an object from
workingmemory in the "then" part of the rule? For e.g., I need the
following
rule "new error"
when
$error : Error (state == NEW_ERROR)
then
(search workingmemory if this error was already
registered)
if (found)
{
$errFromWorkingMemory.setLastTimestamp(currentTimestamp)
retract($error);
}
End
Thanks,
Ashfaq
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rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
--
Steven Williams
Supervising Consultant
Object Consulting
Office: 8615 4500 Mob: 0439 898 668 Fax: 8615 4501
stevenw(a)objectconsulting.com.au
www.objectconsulting.com.au
consulting | development | training | support
our experience makes the difference
12:47 p.m.
Ashfaq,
The idea of a rules engine is that all the "search", or in better
words, the "match" of facts is done in the LHS. This is exactly what the
rules engine does better! The RHS should be composed (ideally) of simple
actions, not algorithms.
For instance, in your example, lets say you use 2 other fields for
correlating the events: source (the origin of the error) and type (the
type of the error).
Your rule would simply be written:
rule "new error"
when
$error : Error( state == NEW_ERROR, $source : source, $type : type )
$errFromWorkingMemory : Error( source == $source, type == $type )
then
$errFromWorkingMemory.setLastTimeStamp( currentTimestamp );
modify( $errFromWorkingMemory );
retract( $error );
end
See? Clean and clear. No algorithms involved and the engine will
optimize the matching and execution giving you the best performance.
You can also create rules to automatically remove any error with
status NEW_ERROR that is not the last one, based on timestamp. Example
rule "keep only the last error"
when
$error : Error( $state : state == NEW_ERROR, $source : source, $type
: type, $timestamp : timestamp )
exists Error( state == $state, source == $source, type == $type,
timestamp > $timestamp )
end
retract( $error );
end
So, my advice is: use the engine to your benefit... ;)
[]s
Edson
Steven Williams wrote:
I think you may want to use a global here:
global ErrorMetaData errorMetadata;
rule "new error"
when
$error : Error (state == NEW_ERROR)
then
(search workingmemory if this error was already
registered)
if (found)
{
errorMetadata.setLastTimestamp(currentTimestamp)
retract($error);
}
end
On 2/28/07, *Framewala, Ashfaq Y* <Ashfaq.Framewala(a)gs.com
<mailto:Ashfaq.Framewala@gs.com>> wrote:
Hi,
I am working on a system where I need to correlate few error
conditions happening in the network infrastructure. I have gone
through the documentation for Jboss rules engine (Drools) and I am
planning to use it for the correlation purpose.
Can anyone let me know a way in which I can get an object from
workingmemory in the "then" part of the rule? For e.g., I need the
following
rule "new error"
when
$error : Error (state == NEW_ERROR)
then
(search workingmemory if this error was already
registered)
if (found)
{
$errFromWorkingMemory.setLastTimestamp(currentTimestamp)
retract($error);
}
End
Thanks,
Ashfaq
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org>
https://lists.jboss.org/mailman/listinfo/rules-users
--
Steven Williams
Supervising Consultant
Object Consulting
Office: 8615 4500 Mob: 0439 898 668 Fax: 8615 4501
stevenw(a)objectconsulting.com.au <mailto:stevenw@objectconsulting.com.au>
www.objectconsulting.com.au <http://www.objectconsulting.com.au>
consulting | development | training | support
our experience makes the difference
------------------------------------------------------------------------
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
--
Edson Tirelli
Software Engineer - JBoss Rules Core Developer
Office: +55 11 3124-6000
Mobile: +55 11 9218-4151
JBoss, a division of Red Hat @ www.jboss.com
1:03 p.m.
Thanks Edson,
This is exactly same as what I tried and it works.
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Edson Tirelli
Sent: Wednesday, February 28, 2007 5:18 PM
To: Rules Users List
Subject: Re: [rules-users] Correlation of events
Ashfaq,
The idea of a rules engine is that all the "search", or in better
words, the "match" of facts is done in the LHS. This is exactly what the
rules engine does better! The RHS should be composed (ideally) of simple
actions, not algorithms.
For instance, in your example, lets say you use 2 other fields for
correlating the events: source (the origin of the error) and type (the
type of the error).
Your rule would simply be written:
rule "new error"
when
$error : Error( state == NEW_ERROR, $source : source, $type : type )
$errFromWorkingMemory : Error( source == $source, type == $type )
then
$errFromWorkingMemory.setLastTimeStamp( currentTimestamp );
modify( $errFromWorkingMemory );
retract( $error );
end
See? Clean and clear. No algorithms involved and the engine will
optimize the matching and execution giving you the best performance.
You can also create rules to automatically remove any error with
status NEW_ERROR that is not the last one, based on timestamp. Example
rule "keep only the last error"
when
$error : Error( $state : state == NEW_ERROR, $source : source, $type
: type, $timestamp : timestamp )
exists Error( state == $state, source == $source, type == $type,
timestamp > $timestamp )
end
retract( $error );
end
So, my advice is: use the engine to your benefit... ;)
[]s
Edson
Steven Williams wrote:
I think you may want to use a global here:
global ErrorMetaData errorMetadata;
rule "new error"
when
$error : Error (state == NEW_ERROR)
then
(search workingmemory if this error was already
registered)
if (found)
{
errorMetadata.setLastTimestamp(currentTimestamp)
retract($error);
}
end
On 2/28/07, *Framewala, Ashfaq Y* <Ashfaq.Framewala(a)gs.com
<mailto:Ashfaq.Framewala@gs.com>> wrote:
Hi,
I am working on a system where I need to correlate few error
conditions happening in the network infrastructure. I have gone
through the documentation for Jboss rules engine (Drools) and I am
planning to use it for the correlation purpose.
Can anyone let me know a way in which I can get an object from
workingmemory in the "then" part of the rule? For e.g., I need the
following
rule "new error"
when
$error : Error (state == NEW_ERROR)
then
(search workingmemory if this error was already
registered)
if (found)
{
$errFromWorkingMemory.setLastTimestamp(currentTimestamp)
retract($error);
}
End
Thanks,
Ashfaq
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org>
https://lists.jboss.org/mailman/listinfo/rules-users
--
Steven Williams
Supervising Consultant
Object Consulting
Office: 8615 4500 Mob: 0439 898 668 Fax: 8615 4501
stevenw(a)objectconsulting.com.au
<mailto:stevenw@objectconsulting.com.au>
www.objectconsulting.com.au
<http://www.objectconsulting.com.au>
consulting | development | training | support
our experience makes the difference
-----------------------------------------------------------------------
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_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
--
Edson Tirelli
Software Engineer - JBoss Rules Core Developer
Office: +55 11 3124-6000
Mobile: +55 11 9218-4151
JBoss, a division of Red Hat @ www.jboss.com
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
6267
days inactive
6267
days old
3 comments
3 participants
participants (3)
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Edson Tirelli -
Framewala, Ashfaq Y -
Steven Williams