Re: [rules-users] Searching a list - Is Drools the answer?
by Drools User
> Wolfgang, Thanks for the reply. The N threads means I need to be able to
> query/check the list very often. The through put is undetermined, but could
> be as high as several hundred lookups per second. It seems you agree that
> using a stateful session would require me to process each request serially,
> unless I wanted to spin up several copies of my facts. That would seem
> inefficient.
>
> Date: Mon, 18 Apr 2011 10:05:29 +0200
>> From: Wolfgang Laun <wolfgang.laun(a)gmail.com>
>> Subject: Re: [rules-users] Searching a list - Is Drools the answer?
>> To: Rules Users List <rules-users(a)lists.jboss.org>
>>
>> It's possible that putting the "constants" into rules will result in a
>> rule
>> building process that's more complex than what you need to do if this data
>> is in facts. Notice that your Object_1 has to participate in (at least)
>> three different matching scenarios, which is a simple thing for a fact,
>> but
>> may need three rules if FirstName and LastName are literals in rules.
>>
>> A (serially) reusable Stateful Session would need to be set up with the
>> 10k
>> facts. A search request enters an object, produces results, and retracts
>> the
>> request; then the session is ready for the next request. (The N threads
>> you
>> are talking about results from some overall application context?)
>>
>> Regards
>> Wolfgang
>>
>> 2011/4/18 Drools User <drools2030(a)gmail.com>
>>
>> > I have been using Drools for several years, but just with constraints
>> > (rules) on 1 set of objects at a time. Think many rules, few facts in a
>> > stateless session. I have been given a new project at the office which
>> > requires having about 10-100k facts and few rules. These 10k facts would
>> be
>> > basically constants, a list of things I need to search on each request.
>> I
>> > would then need to load a single object, based on a request to see if my
>> > request object matched the list. It is somewhat a simple search, but I
>> need
>> > to be able to inject aliases and search partial matches in addition to
>> exact
>> > matches. A generic example:
>> >
>> > List:
>> > Object 1 (FirstName=John, LastName=Smith)
>> > Object 2 (FirstName=Will, LastName=Smith)
>> > Object 3 (FirstName=Jon, LastName=Smith)
>> >
>> > Request/Use Case:
>> > LastName=Smith, would return all 3 objects, but marked as single match
>> > LastName=Smith, Firstname =John, Would return object 1, as exact double
>> > match, and Object 3 a nickname double match
>> > LastName=Smith, Firstname =J, Would return object 1 and 3, as partial
>> match
>> >
>> > In the second request, I need to run all names through a nickname
>> DB/list
>> > to explode the name into multiple search patterns. Possibly using (
>> > http://code.google.com/p/nickname-and-diminutive-names-lookup/)
>> >
>> > Hopefully that explains a bit about the problem.
>> >
>> > So to the question, there are a few ways to solve this. The simplest is
>> > just SQL from a DB, but this proves to be slow to search all the ways I
>> > need. I need sub second response times. An in memory DB is another
>> possible
>> > solution we are looking at. Not to think of Drools as the golden hammer,
>> but
>> > this smells like something I can use Drools for. My first thought was to
>> > load the "List" as facts into a stateful session. My concern is wouldn't
>> I
>> > need N copies of the list loaded to have N threads? This would be
>> > inefficient if so. I know rules aren't copied per working memory, but is
>> > there a way to create a master working memory for facts to use?
>> >
>> > So my second thought is to convert my List into rules so they would only
>> be
>> > stored once in the system, regardless of number of threads using the
>> engine.
>> >
>> > What do you guys think, am I on the right track with this? Is Drools a
>> good
>> > way to do this or is there something better I have overlooked?
>> >
>> > Thank you for taking the time.
>> > -Drools user
>>
>
>
15 years
Re: [rules-users] rules-users Digest, Vol 53, Issue 62
by Drools User
Wolfgang, Thanks for the reply. The N threads means I need to be able to
query/check the list very often. The through put is undetermined, but could
be as high as several hundred lookups per second. It seems you agree that
using a stateful session would require me to process each request serially,
unless I wanted to spin up several copies of my facts. That would seem
inefficient.
Date: Mon, 18 Apr 2011 10:05:29 +0200
> From: Wolfgang Laun <wolfgang.laun(a)gmail.com>
> Subject: Re: [rules-users] Searching a list - Is Drools the answer?
> To: Rules Users List <rules-users(a)lists.jboss.org>
>
> It's possible that putting the "constants" into rules will result in a rule
> building process that's more complex than what you need to do if this data
> is in facts. Notice that your Object_1 has to participate in (at least)
> three different matching scenarios, which is a simple thing for a fact, but
> may need three rules if FirstName and LastName are literals in rules.
>
> A (serially) reusable Stateful Session would need to be set up with the 10k
> facts. A search request enters an object, produces results, and retracts
> the
> request; then the session is ready for the next request. (The N threads you
> are talking about results from some overall application context?)
>
> Regards
> Wolfgang
>
> 2011/4/18 Drools User <drools2030(a)gmail.com>
>
> > I have been using Drools for several years, but just with constraints
> > (rules) on 1 set of objects at a time. Think many rules, few facts in a
> > stateless session. I have been given a new project at the office which
> > requires having about 10-100k facts and few rules. These 10k facts would
> be
> > basically constants, a list of things I need to search on each request. I
> > would then need to load a single object, based on a request to see if my
> > request object matched the list. It is somewhat a simple search, but I
> need
> > to be able to inject aliases and search partial matches in addition to
> exact
> > matches. A generic example:
> >
> > List:
> > Object 1 (FirstName=John, LastName=Smith)
> > Object 2 (FirstName=Will, LastName=Smith)
> > Object 3 (FirstName=Jon, LastName=Smith)
> >
> > Request/Use Case:
> > LastName=Smith, would return all 3 objects, but marked as single match
> > LastName=Smith, Firstname =John, Would return object 1, as exact double
> > match, and Object 3 a nickname double match
> > LastName=Smith, Firstname =J, Would return object 1 and 3, as partial
> match
> >
> > In the second request, I need to run all names through a nickname DB/list
> > to explode the name into multiple search patterns. Possibly using (
> > http://code.google.com/p/nickname-and-diminutive-names-lookup/)
> >
> > Hopefully that explains a bit about the problem.
> >
> > So to the question, there are a few ways to solve this. The simplest is
> > just SQL from a DB, but this proves to be slow to search all the ways I
> > need. I need sub second response times. An in memory DB is another
> possible
> > solution we are looking at. Not to think of Drools as the golden hammer,
> but
> > this smells like something I can use Drools for. My first thought was to
> > load the "List" as facts into a stateful session. My concern is wouldn't
> I
> > need N copies of the list loaded to have N threads? This would be
> > inefficient if so. I know rules aren't copied per working memory, but is
> > there a way to create a master working memory for facts to use?
> >
> > So my second thought is to convert my List into rules so they would only
> be
> > stored once in the system, regardless of number of threads using the
> engine.
> >
> > What do you guys think, am I on the right track with this? Is Drools a
> good
> > way to do this or is there something better I have overlooked?
> >
> > Thank you for taking the time.
> > -Drools user
>
15 years
Drools Decision trees
by saihegde
Is there a reference implementation towards Decision Trees (knowing what
Rules that were executed). I know we can have listeners to working memory to
log rule events. But what we have been thinking is that there should be a
better way of knowing why a certain rule failed than writing negative
condition/'s for every positive rule that exists in your BRMS.
Thanks!
Sai
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15 years
Some Querries on Drools
by Sumeet Karawal
Hello All,
I have some queries regarding use of drools as rule engine for my
Application. It would be very helpful if I get some guidance regarding
these:
1) I have an application in which a user logs in, and according to his
profile he is provided with some benefits, and rule engine check for the
eligibility criteria. But if hundreds of thousands of user will log in at
same time, then what will be the performance accordingly. Like, these
concurrent users hitting the server, and so many threads will be generated
and many number of rules will be fired in the session. Will this hamper the
performance of Rule Engine.
2) Suppose I have an application using drools. I create EAR / WAR file of
that application and deploy it on some other system. Would it be still
possible for me to change the rules on the fly. Or some dependencies might
have to be managed.
3) How can we manage sessions in drools? Suppose we are having different
stateful sessions in our application, but time consumption when we
fireAllRules() exceeds the expected time. So is there a mechanism to kill,
restart the session in drools. Could I get some help/document regarding
session Management on drools.
Thanks & Regards,
Sumeet Karawal
CEG - Open Source Technology Group
Tata Consultancy Services
Ph:- +912267782556
Cell:- +919833236440
Mailto: sumeet.karawal(a)tcs.com
Website: http://www.tcs.com
____________________________________________
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Business Solutions
Outsourcing
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15 years
Drools DB configuration mysql
by MichaelBini
Hi ,
I am using brms-standalone-5.1.0
I try to connect it into MySql DB.
My step are :
1.Run Guvnor with default,and generate the repository.xml and folder at
JBOSS_HOME\bin dictionary
2.I edit repository.xml and delete the folder.
3.install Mysql database,and create the drools database instance,and copy
mysql driver to JBOSS_HOME\server\deploy\lib
4.Restart the JBoss ,i get the exception:
ERROR 18-04 14:46:24,922 (DatabasePersistenceManager.java:store:476)
failed to write node state: deadbeef-cafe-babe-cafe-babecafebabe
com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException:
Duplicate entry 'deadbeef-cafe-babe-cafe-babecafebabe' for key
'DEFAULT_NODE_IDX'
repository.xml -
<?xml version="1.0"?>
<!DOCTYPE Repository PUBLIC "-//The Apache Software Foundation//DTD
Jackrabbit 1.4//EN"
"http://jackrabbit.apache.org/dtd/repository-1.4.dtd">
<Repository>
<FileSystem class="org.apache.jackrabbit.core.fs.local.LocalFileSystem">
</FileSystem>
<Security appName="Jackrabbit">
<AccessManager
class="org.apache.jackrabbit.core.security.SimpleAccessManager">
</AccessManager>
<LoginModule
class="org.apache.jackrabbit.core.security.SimpleLoginModule">
</LoginModule>
</Security>
<Workspaces rootPath="${rep.home}/workspaces"
defaultWorkspace="default"/>
<Workspace name="default">
<FileSystem
class="org.apache.jackrabbit.core.fs.local.LocalFileSystem">
</FileSystem>
<SearchIndex
class="org.apache.jackrabbit.core.query.lucene.SearchIndex">
</SearchIndex>
</Workspace>
<Versioning rootPath="${rep.home}/version">
<FileSystem class="org.apache.jackrabbit.core.fs.db.DbFileSystem">
</FileSystem>
<PersistenceManager
class="org.apache.jackrabbit.core.state.db.SimpleDbPersistenceManager">
</PersistenceManager>
</Versioning>
<SearchIndex
class="org.apache.jackrabbit.core.query.lucene.SearchIndex">
</SearchIndex>
</Repository>
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15 years
Test Scenarion in guvnor does not give me correct results
by navneet.singh
Hi,
I have created a decision table, using drools guvnor, which has some
condition columns, which is dependent on fact named "Feature", which has
columns defined under "Fact Field" column in below table, and its respective
values
Name Data Type Fact Field
Operator Value
Surface Area Decimal number surface_area
== 48
Flatness Deviation Decimal number flatness_deviation
== 0.8
Surface Finish min Decimal number surface_finish
>= 0.8
Surface Finish max Decimal number surface_finish
<= 0.8
Material Name Text material
== ALUMINIUM
Material Fraction Decimal number material_fraction
== 32
Action column gives an output, a fact of type "Process", as an output with
following details
Name Data Type Fact Field Value
Process Name Text Name
Magnesium Tooling Plate
I've crated a test scenario in which I insert a fact of type Feature, with
values which do not match any of the condition columns (I feed in wrong
values just to check if the test fails), but the test runs successfully.
When I click the show events button, I can see that the rule from decision
table has not been fired.
Can anyone please help me understand what is happening here.
Thanks in advance.
Navneet Singh
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15 years
Searching a list - Is Drools the answer?
by Drools User
I have been using Drools for several years, but just with constraints
(rules) on 1 set of objects at a time. Think many rules, few facts in a
stateless session. I have been given a new project at the office which
requires having about 10-100k facts and few rules. These 10k facts would be
basically constants, a list of things I need to search on each request. I
would then need to load a single object, based on a request to see if my
request object matched the list. It is somewhat a simple search, but I need
to be able to inject aliases and search partial matches in addition to exact
matches. A generic example:
List:
Object 1 (FirstName=John, LastName=Smith)
Object 2 (FirstName=Will, LastName=Smith)
Object 3 (FirstName=Jon, LastName=Smith)
Request/Use Case:
LastName=Smith, would return all 3 objects, but marked as single match
LastName=Smith, Firstname =John, Would return object 1, as exact double
match, and Object 3 a nickname double match
LastName=Smith, Firstname =J, Would return object 1 and 3, as partial match
In the second request, I need to run all names through a nickname DB/list to
explode the name into multiple search patterns. Possibly using (
http://code.google.com/p/nickname-and-diminutive-names-lookup/)
Hopefully that explains a bit about the problem.
So to the question, there are a few ways to solve this. The simplest is just
SQL from a DB, but this proves to be slow to search all the ways I need. I
need sub second response times. An in memory DB is another possible solution
we are looking at. Not to think of Drools as the golden hammer, but this
smells like something I can use Drools for. My first thought was to load the
"List" as facts into a stateful session. My concern is wouldn't I need N
copies of the list loaded to have N threads? This would be inefficient if
so. I know rules aren't copied per working memory, but is there a way to
create a master working memory for facts to use?
So my second thought is to convert my List into rules so they would only be
stored once in the system, regardless of number of threads using the engine.
What do you guys think, am I on the right track with this? Is Drools a good
way to do this or is there something better I have overlooked?
Thank you for taking the time.
-Drools user
15 years
Double Referencing
by Guy Moas
Hi,
Could you please assist me whether I can double referencing issues
Person.GetDOB().GetYear(); with Drools (Java, Guvnor)
Please try to send an exmaple
Many thanks,
Regards,
Guy Moas - Technical Project Manager
tel: +972 (73) 2608276 | mobile: +972 (52) 3624583 | X-Lite: 8276 | fax:
+972 (73) 2608205
GMoas(a)fis-software.com | http://www.fis-software.com
<http://www.fis-software.com/>
15 years
Simple rule and Query
by DECOUX Yannick
Hi,
I'am trying to use Query and i'am facing a little problem :
Given this simple rule :
package be.test.person
import be.test.person.*
query "get adult"
adult : Adult( )
end
query "get person"
person : Person( )
end
declare Adult
name : String
end
rule "A person over 18 is an adult"
when
Person( age >= 18)
then
System.out.println("Adult detected");
insert(new Adult());
end
Lets suppose one Person over 18 is inserted inside the working memory, the result of the query < get adult > is 0 (Please note the declaration of Adult type inside the rule)
If I create a Java class Adult (commenting the one in the .drl file) and then run the query again, this time the result is 1
Also, the signature of org.drools.runtime.rule.WorkingMemory.getQueryResults(String) says IllegalArgumentException when query is not found in the KnowledgeBase. This doesn't seems to be the case when I use a fake query name.
I'am using drools 5.1.1
Any idea on this ?
Thanks
15 years
Planner and optional rules
by ToTToRRo
Hello.
I'm working on a planning system and my customer is requesting to use a rule
engine. Of course, we are gonna use Drools and we are considering planner.
The customer already talked about having hard and soft constraints, however,
one request of the users is to enable them to inactivate specific
constraints for some specific one-shot calculation when required.
I've been thinking of using specific RuleFlows in order to not use the
different constraints selected by the user, but is seems a bit long and
risky as the number of selectable constraints could be high therefore
increasing the number of combination (RuleFlows) to write.
Is there any native solution to this issue knowing that performances are in
the spotlight as well?
Thanx in advance.
Nico
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15 years
