creating a rule and storing in a drl file using APIs
by sandeep bonkra
Hi,
I am new to Drool. I need one clarification.
Can we create a rule and then store it to a .drl file using drools APIs. I
have successfully created a rule using the APIs (Rule, Pattern etc).
Although it is getting compared with Facts also. But i need to store the
rule in drl and updated the rule whenever a user enters a new rule.
I would really appreciate you guys for providing any help in this regard.
Thanks in advance. Please guide.
Regards,
Sandeep
17 years, 5 months
Adding multiple packages
by Ashish Soni
Hi All ,
Can some one please show an example how can i add and build multiple
packages for executing rules.
Regards,
Ashish
17 years, 5 months
Drools rule writing question
by Denny Lee
Hello,
I am new to Drools. We have been using JESS for a while and ran into a problem that we cannot solve and is hoping Drools have a solution. Is there anything in the Drools language / rules that allows for
temporal evaluation within the rules? What I mean is, say your rule
examines 2 variables, var1 and var2, and if both are true it fires. Is
there any way/technique to say "If var1 becomes true and var2 was
ALREADY true, fire" and "If var1 was ALREADY true and var2 becomes
true, DO NOT fire?" I've worked w/ JESS and there is nothing built
into the language that does this. Is there something in Drools that can handle this or some general techniques that can deal with something like this?
Thanks.
Denny
17 years, 5 months
[Re:] No return from Guvnor
by J Michael Dean
Just a couple additional comments. The binary package DOES get loaded
into the localCache that is in my properties file; when I shut down
JBoss, the app does try to hit the cache file. I also downloaded the
DRL from Guvnor, and when I point at the DRL directly, the code all
executes properly. I hope this might be helpful but I do not
understand why I do not get an agent back in my previously posted code.
17 years, 5 months
StatefulKnowledgeSession and J2EE
by Dan Seaver
Is there any recommended "Best Practice" for instantiating and accessing a
StatelfulKnowledgeSession in a J2EE environment?
One use case for this type of session is it will act as a Complex Event
Processor - taking in low-level events from all over the system and throwing
complex events based on Fusion rules. The session is intended to be global
in nature as ALL events will flow through this CEP processor.
Another use case would be for long running processes or work-flows that
interact with data streams.
The 3 patterns I'm looking at are:
- the Singleton pattern
- use of JMS and MDBs
- use of external rule server(s)
Any thoughts about scalability issues?
--
View this message in context: http://www.nabble.com/StatefulKnowledgeSession-and-J2EE-tp21968423p219684...
Sent from the drools - user mailing list archive at Nabble.com.
17 years, 5 months
No return from Guvnor
by J Michael Dean
I have an app that can run with a local DRL file and with 4.07 and
BRMS, all has been working. Migrating to 5 to take advantage of
Guvnor. However, when I try to instantiate a RuleAgent using a
properties file, my code goes to heaven (or the other place). From
the code below, the subsequent console output results, which indicates
connection to Guvnor and apparent creation of the rulebase, but the
code never returns.
public RulesEngine() throws RulesEngineException {
super();
try {
System.out.println("Instantiating an agent with properties file");
RuleAgent agent = RuleAgent.newRuleAgent("/glucoseRules.properties");
System.out.println("Should have instantiated an agent");
rules = agent.getRuleBase();
System.out.println("Have a rule base from the agent");
} catch (Exception e) {
System.out.println(e.toString());
throw new RulesEngineException("Could not load/compile rules files:
", e);
}
}
Instantiating an agent with properties file
RuleAgent(default) INFO (Thu Feb 12 06:18:02 MST 2009): Configuring
with newInstance=false, secondsToRefresh=30
RuleAgent(default) INFO (Thu Feb 12 06:18:02 MST 2009): Configuring
package provider : URLScanner monitoring URLs: http://localhost:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/gluc...
with local cache dir of /rules
RuleAgent(default) INFO (Thu Feb 12 06:18:02 MST 2009): Applying
changes to the rulebase.
RuleAgent(default) INFO (Thu Feb 12 06:18:02 MST 2009): Adding package
called glucose.decision.rules
The properties file:
url=http://localhost:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/glucose.decision.rules/LATEST
localCacheDir=/rules
poll=30
Again, this code all worked as written when I was using 4.07 and
BRMS. Any assistance is greatly appreciated!
17 years, 5 months
RE: Guvnor Enumerations in Web-Based Decision tables
by Vikrant Yagnick
Sorry,
Found the answer to this one. I should have played around a little more.
Just in case anyone is interested if a column is defined as an enumeration it automatically appears as a drop down list in Guvnor Web Based Tables.
Cheers,
Vikrant
From: Vikrant Yagnick
Sent: Thursday, February 12, 2009 3:03 PM
To: Rules Users List
Subject: Guvnor Enumerations in Web-Based Decision tables
Hi All,
I was wondering if it is possible to use Enumerations for a column in the Web-Based decision tables?
Currently, the column configuration uses a static list of values, but it would be really cool if we could specify an Enumeration name there and the enumeration could itself come from the database thus making the columns show a list of values dynamically.
Cheers,
Vikrant Yagnick
Software Designer - CLICO
MajescoMastek Ltd | Mastek Millennium Center,Millennium Business Park, Mahape, Navi Mumbai 400-710 |
(T) 91 22 66952222 Extn - 5230 | Mobile: +919833490598 | www.mastek.com
MASTEK LTD.
Mastek is in NASSCOM's 'India Top 20' Software Service Exporters List.
In the US, we're called MAJESCOMASTEK
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Opinions expressed in this e-mail are those of the individual and not that of Mastek Limited, unless specifically indicated to that effect. Mastek Limited does not accept any responsibility or liability for it. This e-mail and attachments (if any) transmitted with it are confidential and/or privileged and solely for the use of the intended person or entity to which it is addressed. Any review, re-transmission, dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited. This e-mail and its attachments have been scanned for the presence of computer viruses. It is the responsibility of the recipient to run the virus check on e-mails and attachments before opening them. If you have received this e-mail in error, kindly delete this e-mail from desktop and server.
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17 years, 5 months
Guvnor Enumerations in Web-Based Decision tables
by Vikrant Yagnick
Hi All,
I was wondering if it is possible to use Enumerations for a column in the Web-Based decision tables?
Currently, the column configuration uses a static list of values, but it would be really cool if we could specify an Enumeration name there and the enumeration could itself come from the database thus making the columns show a list of values dynamically.
Cheers,
Vikrant Yagnick
Software Designer - CLICO
MajescoMastek Ltd | Mastek Millennium Center,Millennium Business Park, Mahape, Navi Mumbai 400-710 |
(T) 91 22 66952222 Extn - 5230 | Mobile: +919833490598 | www.mastek.com
MASTEK LTD.
Mastek is in NASSCOM's 'India Top 20' Software Service Exporters List.
In the US, we're called MAJESCOMASTEK
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Opinions expressed in this e-mail are those of the individual and not that of Mastek Limited, unless specifically indicated to that effect. Mastek Limited does not accept any responsibility or liability for it. This e-mail and attachments (if any) transmitted with it are confidential and/or privileged and solely for the use of the intended person or entity to which it is addressed. Any review, re-transmission, dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited. This e-mail and its attachments have been scanned for the presence of computer viruses. It is the responsibility of the recipient to run the virus check on e-mails and attachments before opening them. If you have received this e-mail in error, kindly delete this e-mail from desktop and server.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
17 years, 5 months
Shadow facts
by J Michael Dean
I am migrating from 4.07 to 5 and my previous DRL file does not
function correctly; I previousliy inserted facts with the dynamic
Boolean set true. I understand that this is no longer done because
shadow facts are "not needed" in Drools 5, but is it necessary to do
anything different in the RHS when modifying facts? My fact POJOs
have a method for adding text to themselves. I believe my rules are
not working properly because nothing is being modified - only the
initial activation set fires and then nothing happens.
Restated, the documentation talks about how to "avoid" shadow facts in
Drools 4.07 - are the restrictions in this part of the docs necessary
in Drools 5?
Thanks.
17 years, 5 months
InvalidRulePackage versus the number
by Hong-Qiang Gao
Hi All,
I tried to migrate Drools 2.1 to 4.0.7 using SpreadsheetCompiler.
What do these numbers mean in following exception?
org.drools.rule.InvalidRulePackage: [9,18]: unknown:9:18 mismatched token:
[@44,188:188='.',<8>,9:18]; expecting type THEN[20,18]: unknown:20:18
mismatched token: [@90,402:402='.',<8>,20:18]; expecting type THEN[31,18]:
unknown:31:18 mismatched token: [@136,606:606='.',<8>,31:18]; .
Thanks,
Hong
17 years, 5 months
