One of the big challenges of using drools is thinking declaratively and not the
iterative method of normal programming. Your first paragraph actually pretty
much sums up your rules nicely. One thing to comment on is that working on
collections (using the from keyword) isn't a particularly
Hi, I am using Drools 5.1.0.M1. I would like to know if there is anymethod or API for querying rules, including namedQuery. Currently I only know how to get the collection of rules from knowledgepackage, but each rule object/class only contains limited information such as 'rule name' and 'package
Hello,
Ok, I understand the problem. dDeb is indeed a Date type.
What is the proper/simplest way to achieve such a comparison ?
Thank you in advance for your help.
Regards,
Benoît
Date: Thu, 4 Mar 2010 10:01:23 +
From: ejdigg...@gmail.com
To: rules-users@lists.jboss.org
Subject: Re:
How was suggested before (in other thread) you can:
1) use getTime() method of Date class which return long and compare
2) use some good library for example Joda time with eval()
Pavel
2010/3/8 Bertrand Grottier b_grott...@hotmail.com:
Hello,
Ok, I understand the problem. dDeb is indeed a
Maybe something like:
rule Prix premier semestre
when
p1 : Produit( eval(dDeb.isBefore(new Date(2010,1,1) ) ) )
then
p1.setPrix( 10 );
update( p1 );
end
Obviously you'll have to import whatever type of date you're using and
change the call to the constructor to
Dear Thomas
I got the idea. Thanks alot for quick and detailed response.
Ragards,
Dhari
From: tswinde...@nds.com
To: rules-users@lists.jboss.org
Date: Mon, 8 Mar 2010 08:16:31 +
Subject: Re: [rules-users] How to traverse the Collection by index
One of the big challenges of
Hi Matthew.
Do you have a specific problem? or you just look for someone how already use
it?
Sounds like if you know SAP data structures and how JCO works you won't have
any problems with Drools.
2010/3/8 Young Matthew (4004) matthew.yo...@forsakringskassan.se
Searched the mail archives
Thank you for your help. I tried the solution you proposed but encountered the
following error message:
[10,27]: [ERR 101] Line 10:27 no viable alternative at input 'new' in rule
Prix premier semestre in pattern Produit
[10,36]: [ERR 102] Line 10:36 mismatched input '2010' expecting ')' in rule
I can only imagine that you have a typo somewhere... Here is some working
test code:
declare TestOb
ddeb : java.util.Date
end
rule Prix premier semestre
when
TestOb(eval(ddeb.before(new java.util.Date(2010,3,1) ) ) )
then
end
___
Hi everybody,
I'm currently doing my bachelor thesis on Rule engines. This includes
comapring different Rule engine products. I have set up a small Java program
(Conway's game of life) and I'm writing the 'engine' in different Rule
engines, while keeping the same GUI,CellGrid etc. I have already
Yes, probably so. Eclipse 3.4 and 3.5 should be fine.
2010/3/7 Moe Alkhafaji moe.alkhaf...@medcpu.com
OK. I am using the following environment items:
Eclipse: 3.3.2.
Plugins/Features from the link you provided below.
Drools runtime 5.0.1
I still see the same error in Eclipse, however,
It's like synchronous vs. asynchronous communication. In reality it's
always asynchronous but from top view it appear synchronous.
Similar to stateless vs. statefull. Statefull is just series of
stateless session where you transfer state from one session to
another. Look for Drools statefull
Hi Tim,
That is a nice topic for studies, but be prepared for a tsunami of
information and quite a few controversies. :)
Regarding your question, I am not sure I completely understand what you
mean, but it is important to be clear that generation of code is an
orthogonal concern to the
Interesting analogy, but careful here:
Statefull is just series of stateless session where you transfer state from
one session to another.
Not sure what lead you to think that way, but it is actually the
opposite, and trying to explain that will make things REALLY confusing for
some. So,
Yes you are right but that should be a hidden detail like asynchronous
connect is internally synchronous because you are waiting for
confirmation packet (but not response) ;-).
No way to implement execution without changing global state - am I
right? BTW I implemented for one small subproject
I need to get the same output as parsing a .DRL file through the XmlDumper
but only with a .DSLR file. Seeing as the DSLR creates a DRL for itself I
thought this would be theoretically be possible but I have yet to find a way
to do this. Any help would be greatly appreciated.
Regards,
Charlie
I just want to report that using Eclipse 3.5.2, inheritance worked
beautifully! Thanks. Now, I am going to get to the actual problem at hand
and try to find a solution. Thanks Edson for all your help in this.
2010/3/8 Edson Tirelli ed.tire...@gmail.com
Yes, probably so. Eclipse 3.4 and 3.5
Delayed modifications of the facts database are bound to have an
impact on the semantics of your rule set (unless, perhaps, you are
writing them anticipating this execution cycle). A stateful session
effects changes immediately, which, in turn, affects the facts and the
agenda immediately.
Thanks a lot everybody for their awnsers, this clarifies it to some extend :)!
What I was talking about was indeed the difference between an: interpreted rete
engine vs. code generated rete engine vs. the use of no inference engine at all
(e.g. Visual Rules). One of the questions that pop
Wolfgang, you've basically described the system I've been working on for two
years, the Early Alerts System at Southwest Airlines. So yes, Tim, there are
real world examples. :) In my case EAS monitors the state of our aircraft
fleet (and soon the state of customer bookings) and alerts
I don't know much about Visual Rules so I will abstain from commenting on
that (although I can imagine what they are doing).
Regarding interpreted vs code generated RETE, there should be no
difference at all on the reasoning process, as the rules would be the same,
does not matter if it is
You can have code generated rete and still maintain state. Edson mentioned
OPSJ, and I can verify that (at least the last time I worked with it 10 years
ago) it was code generated and maintained state.
http://www.pst.com/opsj.htm
http://www.pst.com/opsjbro.htm
--- On Mon, 3/8/10, Tim de
Thanks for letting us know. Good luck!
Edson
2010/3/8 Moe Alkhafaji moe.alkhaf...@medcpu.com
I just want to report that using Eclipse 3.5.2, inheritance worked
beautifully! Thanks. Now, I am going to get to the actual problem at hand
and try to find a solution. Thanks Edson for all
Thank you this explains it. As I see it the Visual Rules approach is very
different in that it's more of a flowchart based approach than actual
inferencing. And it's clear now that there is no difference in the infreasoning
inferencing process either interpreted or compiled.
Also interesting
Hello All ,
I need to integrate Mysql with Drools
1)I have made the following changes in the repositry..xml file
PersistenceManager
class=org.apache.jackrabbit.core.persistence.bundle.MySqlPersistenceManager
param name=url
value=jdbc:mysql://localhost.:3306/guvnor_db;create=true/
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