firing rules twice in single session on single object
by Sai Nadh
hi ,
I am able to fire the rules in drools...But i want to fire the rules
after modification of same data
ie.., i want to fire the rules twice in the same session
for example: i have some stock of different items, if the particular stock
item quantity is less than minimum quantity i want fire a rule that order
that quantity
after that the stock is added to that previous count(stock), i want to
recheck the stock positions and again need to fire rules
is it possible to fire the rules twice or more in Drools
if, please provide me some sample code....
I want to know that Drools can fire a rule multiple times in one session or
not????
please let me know if possible and guide me in this scenario
thanks in advance
13 years, 8 months
How to Use functions in Web-Guided Editor
by ayonchak
Hi All,
I am facing some problem when migrating from excel-based drools to Drools
Guvnor. Suppose we are using some function in the Conditions and Actions of
excel. But how to write them in Guvnor as in Guvnor I can only get the value
of the condition and set the value of the variable in action. Then I can
manipulate the value in code. But is there any option of doing that in Rule?
Like I am using this in an action of excel based Drools -
long mnthlyBnft=$1*1L;
if(planRule.getMonthlyBnftList().size() == 0)
{
do
{
planRule.getMonthlyBnftList().add(mnthlyBnft);
mnthlyBnft = mnthlyBnft + $3;
}while(mnthlyBnft<=$2);
}
In the values I am giving 3 comma-separated values for $1, $2 and $3.
How to do the same in Guvnor? I saw the new function option in Guvnor but
didn't find anywhere how to use that in Web-Guide based decision table rule.
Please help me. Thanks!
Ayon
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13 years, 8 months
what is best way to deal with db access in rules?
by mpgong
Hello,
I have some rules that go out to a database to pull values for conditions in
my rules, is this something that isn't wise to do? Problem is that with
even a small set of facts about ~5500, things take a while to run with about
100 rules. Most of the time, we are thinking is from the db access. It
would take several hours to finish. We want to see if we can get this down
to under 30mins or better.
So the question is what is the best way handle these conditions, should we
make the queries before running the rules and loading them as facts in the
engine or is there some other means to do this more efficiently?
Thanks
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13 years, 8 months
Rule not working with Change_set.xml
by anniejoseph
Hi,
I'm trying to use change-set.xml, which pionts to a drl file.My code is
try {
url =new URL("file:config/change-set.xml");
} catch (MalformedURLException e) {
e.printStackTrace();
}
kagent = KnowledgeAgentFactory.newKnowledgeAgent( "MyAgent" );
kagent.applyChangeSet( ResourceFactory.newUrlResource( url ) );
kbase = kagent.getKnowledgeBase();
ksession= kbase.newStatefulKnowledgeSession();
sconf
=ResourceFactory.getResourceChangeScannerService().newResourceChangeScannerConfiguration();
sconf.setProperty( "drools.resource.scanner.interval", "10" );
ResourceFactory.getResourceChangeScannerService().configure( sconf );
ResourceFactory.getResourceChangeNotifierService().start();
ResourceFactory.getResourceChangeScannerService().start();
ksession.insert(object);
ksession.fireAllRules();
and my change-set.xml is:-
<?xml version="1.0" encoding="UTF-8"?>
<change-set xmlns='http://drools.org/drools-5.0/change-set'
xmlns:xs='http://www.w3.org/2001/XMLSchema-instance'
xs:schemaLocation='http://drools.org/drools-5.0/change-set
http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-api/src/...'
>
<add>
<resource source ='file:config/Rule.drl' type='DRL'
basicAuthentication='enabled' username='admin' password='admin'></resource>
</add>
</change-set>
This code worked without any exception, but the rule is not executing. I
tried without changeset.xml and rule worked properly.
What is wrong?
Thanks
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13 years, 8 months
Not able to upload POJO model jar in Oracle DB.
by Manasi
Hi,
Currently I am using Oracle 11g DB for Guvnor repository for storing my
rules and POJO model jar.
After guvnor instance is started following 11 tables are created in Oracle
11g DB schema.
1) FS_FSENTRY
2) FS_WS_DEFAULT_FSENTRY
3) PM_WS_DEFAULT_BINVAL
4) PM_WS_DEFAULT_BUNDLE
5) PM_WS_DEFAULT_NAMES
6) PM_WS_DEFAULT_REFS
7) VERSIONING_FS_FSENTRY
8) VERSIONING_PM_BINVAL
9) VERSIONING_PM_BUNDLE
10) VERSIONING_PM_NAMES
11) VERSIONING_PM_REFS
I have copied *"ojdbc6.jar"* jar in my tomcat 7's lib folder. I am using jdk
1.7.
I am able to create packages in oracle but not able to uplaod my model jar
in DB.
Please find attach file Oracle_Error.txt
<http://drools.46999.n3.nabble.com/file/n4020187/Oracle_Error.txt> for
error log:
In MySQL DB uploading of jar works fine.
Please let me know if there is any issue in Oracle version?
Thanks,
Manasi
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13 years, 8 months
Egg Planning: number of facts is also a planning variable
by Paul Adams
Hi everyone,
I'm new to Drools, so apologies if I'm missing something obvious or mixing up my terms here. Hopefully the subject line got someone's attention!
My problem is this (somewhat contrived and simplified):
Facts:
1. A person would like to eat 3 eggs per day, of each of several different breeds (Legbar, Rhode Island Red, Dorking)
2. A hen takes 45 days to get to egg-laying stage (varies by breed)
3. At maturity, each hen lays 2 eggs every 10 days (also varies by breed)
4. A hen house has 30 available roosts
5. Each hen can lay 5 times before they give up (luckily for us this isn't really true!)
My planning problem is to figure out how many chicks I need to buy, when I need to buy them, and to allocate them to a particular roost for their entire egg-laying life. Basically what I would like the solution to contain is an allocation of a particular hen to a roost for a particular period, when the eggs will appear, and when a roost will become free to plan more hens.
Hard Constraint:
No hen can share the same roost
The problem feels like the hospital bed problem in the examples, but where the number of patients is both a planning variable and a fact, and the planning period is undefined. As I said, the problem is paraphrased and simplified - there are a number of soft constraints - some hens like it hot :-)
I would appreciate any guidance as to how I might model this problem, or any simplifications I could make.
Many thanks,
Paul.
13 years, 8 months
1 Week Until Intellifest - Register soon to learn about Drools & jBPM
by Mark Proctor
http://blog.athico.com/2012/10/1-week-until-intellifest-register-soon.html
----
Only 1 week to go for IntelliFest 2012, in San Diego, start Monday 22nd of October.
Program Overview ( detailed agenda for Monday and Tuesday below ):
Monday - Healthcare focus for Rules, Workflow, Ontologies and Events (Free)
Tuesday - General Drools&jBPM session (Free)
Tuesday - Rule Design Patterns in Production Rule Systems
Wed - Fri - General IntelliFest Sessions
There are limited spaces, so register soon here.
Monday - Healthcare focus for Rules, Workflow, Ontologies and Events (free)
0830-0920 Captain Emory Fry, MD
Socratic Grid : Open Source Distributed Decision Support for Healthcare
0930-1020 Dr Robert Greenes, Department of Biomedical Informatics, Arizona State University
Key Note : Embedding Decision Support in Clinical Systems
1030-1120 Dr Aziz Boxwala, Division of Biomedical Informatics, University of California
Clinical Decision Support Consortium
1130-1200 Dr Seong Ki Mun, President and CEO of OSEHRA
Open Source Electronic Health Record Agent
1200:1300 Lunch
1300-1350 Dr Davide Sottara, Department of Biomedical Informatics, Arizona State University
Knowledge Representation Standards For Building Executable Clinical Processes Models
1400-1450 David Shields, Health ITS, University of Utah
OpenCDS: a Clinical Decision Support Infrastructure Based on Drools
1500-1520 Harold Solbring, Division of Biomedical Informatics, Mayo Clinic
Semantic Wiki
1530-1655 Conor Dowling, Caregraf
Semantic Terminology Services
1600-1620 Dr Xiao Hu, Department of Neurosurgery, University of California
Clinical Decision Support Driven Alarms
1630-1700
Panel Discussion - Collaboration Opportunities
Tuesday - General Drools&jBPM Workshop (free)
8.00 AM: Breakfast Social – pre-laptop setup, and QA time with solution Architects.
-Key will be provided to setup your laptop, so you can view and run the examples used during the talks.
9.00 BRMS Product Overview (Prakash Aradhya 15min)
How we turn the Drools and jBPM communtiy parts into a world class product. Supporting and harvesting all the innovation done in the open community, Red Hat delivers reliable, dependable and integrated solutions for enterprise customers.
9.15 Introduction to Drools Expert (Mark Proctor 45min)
Drools Expert covers the business rule engine. A gentle, example driven, dive into the Drools technical rule language and engine features.
10.10 Introduction to Drools Fusion (Edson Tirelli 45min)
Learn how Drools does CEP differently. Our unified approach extends Drools Expert with a series of language and sub-engine extensions to provide temporal reasoning and event correlation.
11.05 Introduction to jBPM and BPMN2 (Tihomir Surdilovic 45min)
jBPM is a BPM engine designed for flexible processes, implementing and extending the BPMN2 spec. Built form the ground up to be part of a unified strategy for business automation and decision management. jBPM fully integrates with Drools Expert and Fusion.
11.45 Decision Modelling with Graphical Editors (Edson Tirelli 30min)
Drools Expert provides sophisticated web based tooling, around decision tables, guided editors and templates. Our decision modelling approach draws from the very best research found at Dr Jan Vanthienien school of Decision Modelling.
12.30 Working Lunch – Experience Drools and jBPM – Hands on labs (Optional) (1hour)
13.30 Human Tasks up Close and Personal (Tihomir Surdilovic 40min)
Human tasks are a central component of BPM. This example driven talk will build an example live, demonstrating what jBPM’s Human Task technology can do for you.
14.20 Building Games with Drools – Pong, Snake and Wumpus (Mark Proctor 40min)
Time for some hard play, learn how to build classic computer games with Drools. These also provide interesting exercises in BA requirements gathering.
15.10 Drools Planner a Quick Overview (Geoffrey De Smet 40min)
Whether it’s employee rostering, task scheduling, vehicle routing, bin packing or another planning problem: all organizations try to optimize their limited resources under constraints. Drools Planner optimizes business resources for normal Java programmers.
15.50 Drools Chance for Imperfect Reasoning (Davide Sottara 40min)
Sometimes data quality is not perfect, so facts may not be known with precision and certainty. Likewise, crisp constraints such as hard thresholds might not be able to capture the complexity of a business policy. Drools Chance allows to apply gradual and/or probabilistic constraints to uncertain or vague data.
16.40 UberFire – Drools&jBPM Workbench framework (Mark Proctor 30min)
UberFire is a new project that forms the foundation of our 6.0 web tooling. It’s standalone framework that provides a sophisticated workbench framework for the web; where everything is a plugin. Come learn about the Uberfire, and how you can use the workbench to build your own web applications.
17.10 Drools&jBPM 6.0 and Beyond (Optional : open as long as people remain)
An open presentation and discussion about the design ideas, principles and goals that are driving the development of Drools & jBPM version 6.0. This will be an optional and informal session where attendees will have the opportunity to learn about what is coming, contribute ideas and provide feedback that will be taken in consideration by the development team.
17.10 Hands on Lab
Run at the same time as "Drools&jBPM and Beyond" and Beyond. Solution Architects are on hand to help you with your coding problems, and running examples.
Tuesday - Rule Design Patterns in Production Systems
Rule Design Patterns
What is a “Rule Design Pattern”?
Basic Rule Formats
Fact Classification
Handling Failure to Match
Extending Rules
Reasoning with Interfaces
Active Facts
Marker Facts
Fact Proxies
Application Design Patterns
Short-Term Sessions
Permanent Sessions
13 years, 8 months
