RE: [rules-users] rule using sliding window
Thanks Edson
I read about "from" CE and understand that it can call any external method.
In the external method I can write the code to extract the data from
database.
I googled and found this, where its using hibernate session and that way
giving complete flexibility in writing rule on any data set. Do you think
it's a good idea?
global org.hibernate.Session hibernateSession;
rule "hibernate_from"
when
game:Game() from
hibernateSession.createQuery("select games from Player p where p.age >=
:age").setProperties( {"age" : 18 }).list()
then
System.out.println("The game "+game.getName() +"is
owned by "+game.getPlayers());
end
-Original Message-
From: rules-users-boun...@lists.jboss.org
[mailto:rules-users-boun...@lists.jboss.org] On Behalf Of Edson Tirelli
Sent: Monday, June 01, 2009 6:48 PM
To: Rules Users List
Subject: Re: [rules-users] rule using sliding window
Hi
The description you have bellow is ambiguous, so I can't give you a
definitive answer. But it seems to be that you don't need sliding windows
for that. Simple temporal operators will do.
> Secondly if the window is large and number of records coming in is high
then could there be a memory issue?
Yes, Drools does not manages persistence by itself. So, if your design
must support more data than it would fit in your running environment memory,
you need to design a solution that comprises persistence.
> Also since every record is getting stored in database, can I not use the
database directly instead of sliding window?
Yes, you can fetch data on demand from external sources, be it databases
or anything else. Look at the "from" CE.
[]s
Edson
2009/6/1 Bhushan Bhangale
I am using Drools 5. I am struggling to write rule for this logic -
If a stock price changes more than 10% within an hour then report the
change.
I understand I have to use sliding window feature but unable to write the
rule.
For example I got an update for IBM stock @ 12:30 for price 100 and then
another update IBM stock @ 12:35 for price 111. Since the time difference is
within an hour and the change is also greater than 10% I want to report this
price change.
Stock class -
Public class Stock {
Private String stock;
Private double price;
Private Date time;
Private double priceChange;
Private Boolean highlight;
}
rule "Stock Price change more than 10% within an hour"
when
then
set the priceChange attribute of Stock object
set highlight to true
end
Secondly if the window is large and number of records coming in is high then
could there be a memory issue?
Also since every record is getting stored in database, can I not use the
database directly instead of sliding window?
Thanks
Mr. Bhangale Bhushan
Associate Manager
Kale Consultants Ltd.
bhushan_bhang...@kaleconsultants.com
tel:
+91 (0)206 608
3777
http://www.kaleconsultants.com
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[rules-users] The Eclipse JDT Core jar is not in the classpath error
Hello, I am using netbeans and ivy with Drools 5. I have successfully named, published the jars from drools to and could build my port of the stock ticker application in netbeans, but when I try to run it, I get the following error: java.lang.NoClassDefFoundError: org/antlr/runtime/tree/TreeNodeStream I have the antlr-runtime jar from the bin/lib on my classpath where I added all the others, but it always fails at this line In loadRuleBase() in Broker.java of the stock ticker sample builder.add( ResourceFactory.newInputStreamResource( Broker.class.getResourceAsStream( RULES_FILE ) ), ResourceType.DRL);. Does anyone have any ideas what jar I might be missing if it's not the antlr-runtime? Thanks, Chris ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] questions on guvnor and drools 5.0
I was wondering if somebody can help me with some questions:
1) Is there any more detail on how to setup Guvnor with a database?
2) How do you use the test scenarios with complex object structures?
-eg Create a fact in working memory that has another Object in it which
in turn has a list of Objects in it.
-Seems like any Fact in working memory is assumed to only have only
primitive values like Strings or numbers.
-We would like a more depth of objects where objects have a deep
relationship to other objects at least 2-4 levels deep.
3) Why add ruleflow-group to the rule definition instead of adding the rule to
a ruleflow-group? If the ruleflow-group is part of the rule then you can't use
the same rule in multiple ruleflow-groups and leads to copy and maintaining the
rule in two different spots.
4) DSL seems to be very inconvenient to edit in a text box especially when it
wraps. Why not a table where you can add rows and each row is a translation.
Also there are no examples how to do translation into Drools syntax that is
multiple lines long and not just a single line.
5) Is Java 5 Type Enumerations supported? I was assuming I'd get a list of
values if a field was an Enumeration.
6) There seems to be a vast functionality difference between the Guvnor
decision tables and examples that use spreadsheets.
7) Guvnor lost the ability to select variables for use in other statements.
Functionality was in BRMS of drools 4.0.7
8) I was not able to insert a fact using a constructor that needed parameter
values. Seems like it assumes everything is a bean but I couldn't find this
requirement stated in the documentation anywhere. Examples in documentation
show inserting facts with constructor parameters.
9) It would be nice when you upload a domain model jar that you could explore
the objects and fields somehow.
10) When you write a rule using one particular editor it would be nice if you
could switch to another editor. Switch between Guided, DSL, Technical, etc.
11) It seems hard to reorder the statements in a when or then block. If I put
them in the wrong order I have to delete them all. Would be nice if a
statement could be moved up or down.
12) When calling a method on an object the choices only showed me public
methods that take in one parameter. I had a method with two parameters and it
wouldn't show me the method. I had to do a DSL or custom drools statement to
get around it.
13) Guvnor seems to limit the drools syntax. I couldn't do a "from
$collection" statement without a custom drools statement line.
14) It would be nice if I could declare a global dialect "java" for all the
rules.
15) It would be nice to define an existing agenda-group as part of a
ruleflow-group without adding the ruleflow-group on the rules in that
agenda-group.
Thanks,
SG
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Re: [rules-users] Clarification regarding the use of Guvnor
Andrew, Looks like you are looking for drools-server to expose the rule engine via JSON. I'm not an expert on the subject by any means, but try reading the documentation (embedded in the Guvnor documents http://downloads.jboss.com/drools/docs/5.0.1.26597.FINAL/drools-guvnor/html_single/index.html#d0e1095 ) and see if anyone else on the mail group knows more about it. Good luck, Steve Ronderos From: Andrew Nguyen To: rules-users@lists.jboss.org Date: 06/01/2009 10:27 AM Subject: [rules-users] Clarification regarding the use of Guvnor Sent by: rules-users-boun...@lists.jboss.org Hello all, I am a very new Drools user and am trying to expose it as a web- service. Due to my experience with Spring, I went ahead and implemented a basic rule engine and exposed it as a web service via Spring. I am now looking at integrating it with Guvnor to allow non- computer people, who are domain experts, to modify the rules. From what I have read in the v5 documentation, it sounds like Guvnor is intended as a complete solution to what I am trying to accomplish - i.e. it will handle the rule management as well as exposing the rule engine via JSON (or other interface). But, when I have searched around the internet, Guvnor sounds like just a rule management component. So, I pretty much have 3 questions: * Is my current setup of Drools + Spring the best way to expose my rule engine to other applications? (Specifically, a .NET/C# app...) * Is Guvnor suitable for integrating into my system as only a rule management system? Thanks! --Andrew -- Andrew Nguyen Nguyen & Associates Custom Software Development & IT Services http://www.na-consulting.net and...@na-consulting.net 858-225-7575 ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] String comparison question
Yes, comma in this case is cleaner, but && should work too. What error do
you see? What version of Drools are you using?
[]s
Edson
2009/6/1 Greg Barton
>
> Try a comma instead of &&
>
> WrapperClass( sentence matches ".*Alpha.*", sentence2 matches ".*Beta*.")
>
> --- On Mon, 6/1/09, Armaghan Mahmud wrote:
>
> > From: Armaghan Mahmud
> > Subject: Re: [rules-users] String comparison question
> > To: "Rules Users List"
> > Date: Monday, June 1, 2009, 11:12 AM
> > Thanks for your reply Edson. What
> > if I want to test for multiple substrings in different
> > strings?
> >
> > For example, how can I find beta in sentence2?
> >
> > I tried to combine WrapperClass( sentence matches
> > ".*Alpha.*" && sentence2 matches
> > ".*Beta*.") but I got errors.
> >
> > Thanks,
> > Armaghan
> >
> > 2009/5/31 Edson Tirelli
> >
> >
> >If the string you are looking for is a substring of
> > your sentence, you need to either use a regexp or an eval to
> > call for an indexOf-like method:
> >
> >
> > WrapperClass( sentence matches ".*Alpha.*" )
> >
> >[]s
> >Edson
> >
> >
> > 2009/5/31 Armaghan Mahmud
> >
> >
> >
> >
> >
> > Hey guys,
> >
> > I read in a previous post that == in Drools 4.0.7 maps
> > to .equals() automatically. My situation required me to put
> > a String object into the working memory and do a comparison
> > on it to see if a particular word is in the passed String
> > sentence. Could anybody please guide me as to how to
> > approach this problem? Thanks in advance. Here's my
> > original code:
> >
> >
> >
> > rule "Find Alpha in a
> > sentence"
> > salience100
> > wrap: WrapperClass(Sentence == "Alpha")
> > then
> > System.out.println("Aha found
> > ya!");
> > end
> >
> >
> > ___
> > rules-users mailing list
> > rules-users@lists.jboss.org
> > https://lists.jboss.org/mailman/listinfo/rules-users
> >
> >
> >
> >
> >
> > --
> > Edson Tirelli
> > JBoss Drools Core Development
> > JBoss, a division of Red Hat @ www.jboss.com
> >
> >
> > ___
> > rules-users mailing list
> > rules-users@lists.jboss.org
> > https://lists.jboss.org/mailman/listinfo/rules-users
> >
> >
> >
> >
> >
> > -Inline Attachment Follows-
> >
> > ___
> > rules-users mailing list
> > rules-users@lists.jboss.org
> > https://lists.jboss.org/mailman/listinfo/rules-users
> >
>
>
>
>
> ___
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>
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JBoss Drools Core Development
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[rules-users] ClassCastException for Hibernate entity when rule is fired
hi, can someone please help with the below issue? Any tips or hints on what could be causing this would be very helpful. We are using Drools 4.0.7 and have a rule which uses a Hibernate entity (SaleEventItem) and its related entity (Inventory). Some times, the SaleEventItem passed as the fact has the Inventory lazy loaded and hence its type is the Hibernate proxy - Inventory_$$_javassist_93. In this case, the rule runs fine. But at times, the SaleEventItem which is passed has the Inventory attribute set explicitly and hence its type is Inventory itself. When the rule fires in this case, it tries to assign the Inventory into Inventory_$$_javassist_93 which causes this ClassCastException. java.lang.ClassCastException: com.crom.data.pojo.Inventory incompatible with com.crom.data.pojo.Inventory_$$_javassist_93 at ASMAccessorImpl_14985690421242774005070.getValue(Unknown Source) at org.mvel.ast.VariableDeepPropertyNode.getReducedValueAccelerated(VariableDeepPropertyNode.java:22) at org.mvel.ast.PropertyASTNode.getReducedValueAccelerated(PropertyASTNode.java:21) at org.mvel.ast.BinaryOperation.getReducedValueAccelerated(BinaryOperation.java:21) at org.mvel.MVELRuntime.execute(MVELRuntime.java:90) at org.mvel.CompiledExpression.getValue(CompiledExpression.java:111) at org.mvel.MVEL.executeExpression(MVEL.java:235) at org.drools.base.mvel.MVELPredicateExpression.evaluate(MVELPredicateExpression.java:45) at org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:209) How do we prevent this? Is it possible to somehow enforce that the type of the variable in the rule should be Inventory and not Inventory_$$_javassist_93? The rule is as follows. dialect "java" when $sale:SaleEventItem(inventory != null, $leaseInfo:inventory.leaseInformation != null, $saleEventPrize:inventory.leaseInformation.residualPayAmount != null) then $sale.setStartPrice((Double)$sale.getInventory().getLeaseInformation().getResidualPayAmount()); Thanks, Sobhana -- View this message in context: http://www.nabble.com/ClassCastException-for-Hibernate-entity-when-rule-is-fired-tp23767583p23767583.html Sent from the drools - user mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] String comparison question
Try a comma instead of &&
WrapperClass( sentence matches ".*Alpha.*", sentence2 matches ".*Beta*.")
--- On Mon, 6/1/09, Armaghan Mahmud wrote:
> From: Armaghan Mahmud
> Subject: Re: [rules-users] String comparison question
> To: "Rules Users List"
> Date: Monday, June 1, 2009, 11:12 AM
> Thanks for your reply Edson. What
> if I want to test for multiple substrings in different
> strings?
>
> For example, how can I find beta in sentence2?
>
> I tried to combine WrapperClass( sentence matches
> ".*Alpha.*" && sentence2 matches
> ".*Beta*.") but I got errors.
>
> Thanks,
> Armaghan
>
> 2009/5/31 Edson Tirelli
>
>
> If the string you are looking for is a substring of
> your sentence, you need to either use a regexp or an eval to
> call for an indexOf-like method:
>
>
> WrapperClass( sentence matches ".*Alpha.*" )
>
> []s
> Edson
>
>
> 2009/5/31 Armaghan Mahmud
>
>
>
>
>
> Hey guys,
>
> I read in a previous post that == in Drools 4.0.7 maps
> to .equals() automatically. My situation required me to put
> a String object into the working memory and do a comparison
> on it to see if a particular word is in the passed String
> sentence. Could anybody please guide me as to how to
> approach this problem? Thanks in advance. Here's my
> original code:
>
>
>
> rule "Find Alpha in a
> sentence"
> salience100
> wrap: WrapperClass(Sentence == "Alpha")
> then
> System.out.println("Aha found
> ya!");
> end
>
>
> ___
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> https://lists.jboss.org/mailman/listinfo/rules-users
>
>
>
>
>
> --
> Edson Tirelli
> JBoss Drools Core Development
> JBoss, a division of Red Hat @ www.jboss.com
>
>
> ___
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> https://lists.jboss.org/mailman/listinfo/rules-users
>
>
>
>
>
> -Inline Attachment Follows-
>
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Re: [rules-users] String comparison question
Thanks for your reply Edson. What if I want to test for multiple substrings
in different strings?
For example, how can I find beta in sentence2?
I tried to combine WrapperClass( sentence matches ".*Alpha.*" && sentence2
matches ".*Beta*.") but I got errors.
Thanks,
Armaghan
2009/5/31 Edson Tirelli
>
>If the string you are looking for is a substring of your sentence, you
> need to either use a regexp or an eval to call for an indexOf-like method:
>
> WrapperClass( sentence matches ".*Alpha.*" )
>
>[]s
>Edson
>
> 2009/5/31 Armaghan Mahmud
>
>> Hey guys,
>>
>> I read in a previous post that == in Drools 4.0.7 maps to .equals()
>> automatically. My situation required me to put a String object into the
>> working memory and do a comparison on it to see if a particular word is in
>> the passed String sentence. Could anybody please guide me as to how to
>> approach this problem? Thanks in advance. Here's my original code:
>>
>>
>> rule "Find Alpha in a sentence"
>> *
>>
>> salience
>> *100
>>
>> wrap: WrapperClass(Sentence == "Alpha")
>>
>> then
>>
>> System.out.*println*("Aha found ya!");
>>
>> end
>>
>>
>>
>>
>>
>> ___
>> rules-users mailing list
>> rules-users@lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>>
>
>
> --
> Edson Tirelli
> JBoss Drools Core Development
> JBoss, a division of Red Hat @ www.jboss.com
>
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>
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Re: Re: Re: [rules-users] Re: Drools performance issue
It's happening because the problem is hard. :) It's quadratic on the average
number of assignments per driver. i.e. for each driver, you compare all of the
assignments to each other, and you must do that for all drivers. So you have (
(num drivers) * (average num assignments)^2 ) firings in the BEST case. (The
rule you originally presented was pretty much the worst case, as you were
matching ( (num drivers)^2 *(num trips)^2 ) )
That's also why the processing happens when you insert the second set: before
that the rule doesn't trigger.
Now, if you don't need to compare trip assignments between drivers, you could
just insert one driver plus their trips and fire the rules.
But if you do want to throw everything in WM at once, you may be able to use
this trick: to detect overlap, you can cut the number of conditions you've got
in half, making things slightly better. You only need to detect that the start
or end of one of the trips is contained in another. Also, is it possible to
have a driverId attribute in your trip object? That would eliminate the need
to match on the driver object. Using both you'd have this:
rule "Assignment Check"
when
$ta1: TripVO();
$ta2: TripVO(
ta1.driverId == driverId,
ta1.startDtmUtc < startDtmUtc,
ta1.endDtmUtc >= startDtmUtc
);
then
Note the "ta1.startDtmUtc < startDtmUtc" instead of ta1.startDtmUtc <=
startDtmUtc". This ensures that you don't test the same two TripVOs twice.
Give this a try.
--- On Mon, 6/1/09, jayadeva...@gmail.com wrote:
> From: jayadeva...@gmail.com
> Subject: Re: Re: Re: [rules-users] Re: Drools performance issue
> To: "Wolfgang Laun"
> Cc: rules-users@lists.jboss.org
> Date: Monday, June 1, 2009, 8:34 AM
> Hi,
>
>
>
> I noticed something interesting. The issue with
> memory is happening always while inserting the second set of
> objects into working memory!
>
> Earlier, I was insering the DriverVO's into WM
> and then inserting the AssignmentsVO, and the system was
> hanging while inserting the AssignmentsVO. Then I reversed
> the order of insertion and then the machine was hit while
> inserting the DriverVO's.
>
>
>
> Does anyone know why this issue might be happening
> and how to overcome this?
>
>
>
> Thanks in advance,
>
> Jayadevan.
>
>
>
> On Jun 1, 2009 6:51pm, jayadeva...@gmail.com wrote:
>
> > Thanks W,
>
> >
>
> >
>
> >
>
> >
>
> >
>
> > I tried it out ,But didn't get any
> performance improvement :(
>
> >
>
> >
>
> > The issue might be that I am inserting too many
> objects into working memory
>
> >
>
> >
>
> >
>
> >
>
> >
>
> > jayadevan
>
> >
>
> >
>
> >
>
> >
>
> >
>
> > On Jun 1, 2009 3:36pm, Wolfgang Laun
> wolfgang.l...@gmail.com> wrote:
>
> >
>
> >
>
> > > The first two patterns pair each driver
> assignment with each trip -
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > > which is quite a lot of work to do. (The
> infix "and" between the 2nd
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > > and 3rd pattern doesn't change this.)
> Also, the field restriction
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > > "tripId in ($tid)" is not the
> most efficient way.
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > > Try this:
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > > rule "Assignment Check"
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > > when
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > > $creVo: DriverAssignVO($drId: driverId,
> $tid1: tripId)
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > > $creVo: DriverAssignVO(driverId ==
> $drId, $tid2: tripId != $tid1)
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > > $trAsgn1: TripVO( tripId == $tid1,
> $startDtmUtc: startDtmUtc,
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > > $endDtmUtc: endDtmUtc)
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > > $trAsgn2: TripVO( tripId == $tid2,
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > > ((startDtmUtc
> >= $startDtmUtc && startDtmUtc
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > > (endDtmUtc >=
> $startDtmUtc && endDtmUtc
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > > then
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > > System.out.println("TRIP ID: "
> + $crvo.getTripId());
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > > end
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > >
>
> >
>
> >
>
> > >
>
> >
>
> >
>
[rules-users] Web services integration for Drools Flow
Hello,
I am evaluating a few workflow engines for an up coming project. Drools flow is
the first one I am looking at.
Question: Is there any existing web services integration with Drools Flow?
Specifically:
1. ability to call a service (Similar to "Email" work item)
2. ability to trigger a flow based on web services input (listener)
I could write a web services wrapper around Drools Flow, but am wondering if
there is an existing solution for it. A quick Google search did not reveal
anything much.
PS: Not looking at jBPM - don't want to get into deploying and maintaining a
J2EE container. For our (simple) purposes, something like tomcat would suffice.
Any pointers in the right direction would be greatly appreciated.
Thanks
Ajay
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[rules-users] Clarification regarding the use of Guvnor
Hello all, I am a very new Drools user and am trying to expose it as a web- service. Due to my experience with Spring, I went ahead and implemented a basic rule engine and exposed it as a web service via Spring. I am now looking at integrating it with Guvnor to allow non- computer people, who are domain experts, to modify the rules. From what I have read in the v5 documentation, it sounds like Guvnor is intended as a complete solution to what I am trying to accomplish - i.e. it will handle the rule management as well as exposing the rule engine via JSON (or other interface). But, when I have searched around the internet, Guvnor sounds like just a rule management component. So, I pretty much have 3 questions: * Is my current setup of Drools + Spring the best way to expose my rule engine to other applications? (Specifically, a .NET/C# app...) * Is Guvnor suitable for integrating into my system as only a rule management system? Thanks! --Andrew -- Andrew Nguyen Nguyen & Associates Custom Software Development & IT Services http://www.na-consulting.net and...@na-consulting.net 858-225-7575 ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: re[rules-users] move hardcoded values in DRL or have constants inside drl
Wolfgang makes a good point. However, given the requirement that the value
changes and is not truly static, I would recommend something like the following
which, if your SearchParm loads the data from a persisted source you could
change it's value without any code change.
Earnie!
package com.sample
rule "Test Rule"
when
SearchParam($searchName : searchName)
$person : Person(name == $searchName)
then
System.out.println(drools.getRule().getName() + " [" + $searchName + "]
[" + $person.getName() + "]");
$person.setActivation(true);
end
package com.sample;
public class Person {
private String name;
private Boolean activation;
public Person(String name, Boolean activation) {
this.name = name;
this.activation = activation;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Boolean getActivation() {
return activation;
}
public void setActivation(Boolean activation) {
this.activation = activation;
}
}
package com.sample;
public class SearchParam {
private String searchName;
public SearchParam(String searchName) {
super();
this.searchName = searchName;
}
public String getSearchName() {
return searchName;
}
public void setSearchName(String searchName) {
this.searchName = searchName;
}
}
package com.sample;
import java.io.InputStreamReader;
import java.io.Reader;
import java.util.Properties;
import org.drools.RuleBase;
import org.drools.RuleBaseFactory;
import org.drools.StatefulSession;
import org.drools.compiler.PackageBuilder;
import org.drools.compiler.PackageBuilderConfiguration;
import org.drools.rule.Package;
import org.drools.rule.builder.dialect.java.JavaDialectConfiguration;
import org.junit.Before;
import org.junit.Test;
import static org.junit.Assert.*;
public class GlobalTest {
private RuleBase ruleBase;
@Test
public void testWithGlobal() {
StatefulSession ss = ruleBase.newStatefulSession();
Person p = new Person("John",false);
ss.insert(p);
SearchParam sp = new SearchParam("John");
ss.insert(sp);
ss.fireAllRules();
assertTrue(p.getActivation().equals(true));
}
@Before
public void buildRules() throws Exception {
Reader source = new InputStreamReader(this.getClass()
.getResourceAsStream("/test.drl"));
Properties props = new Properties();
props.setProperty("drools.dialect.java.compiler", "JANINO");
PackageBuilderConfiguration cfg = new
PackageBuilderConfiguration(props);
JavaDialectConfiguration javaConf = (JavaDialectConfiguration) cfg
.getDialectConfiguration("java");
javaConf.setCompiler(JavaDialectConfiguration.JANINO);
PackageBuilder builder = new PackageBuilder(cfg);
builder.addPackageFromDrl(source);
Package pkg = builder.getPackage();
ruleBase = RuleBaseFactory.newRuleBase();
ruleBase.addPackage(pkg);
}
}
From: Wolfgang Laun
To: Rules Users List
Sent: Monday, June 1, 2009 7:57:36 AM
Subject: Re: re[rules-users] move hardcoded values in DRL or have constants
inside drl
But assigning a value to a global isn't straightforward - you can't do
it in the declaration. You'll have to do it from the application (or
use some dirty hack, in a start-up rule); either way it's separate
from the declaration.
IMHO, using a Java class with public static final is definitely cleaner.
-W
2009/6/1 Earnest Dyke :
> How about adding them as Globals and referencing them that way? You should
> be able to put them in a map as well in a Global and reference them.
>
> Earnie!
>
>
> From: karthizap
> To: rules-users@lists.jboss.org
> Sent: Monday, June 1, 2009 7:14:56 AM
> Subject: re[rules-users] move hardcoded values in DRL or have constants
> inside drl
>
> Is there is anyway i can remove hardcoded values in the DRL file? Can I have
> the constants file(like data dictionary) inside drl/functions. I don't want
> to refer java constants class directly in drl file and would like to declare
> and refer those constants inside drl file.
>
> View this message in context: remove hardcoded values in DRL or have
> constants inside drl
> Sent from the drools - user mailing list archive at Nabble.com.
>
> ___
> rules-users mailing list
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>
>
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Re: Re: Re: [rules-users] Re: Drools performance issue
Hi,
I noticed something interesting. The issue with memory is happening always
while inserting the second set of objects into working memory!
Earlier, I was insering the DriverVO's into WM and then inserting the
AssignmentsVO, and the system was hanging while inserting the
AssignmentsVO. Then I reversed the order of insertion and then the machine
was hit while inserting the DriverVO's.
Does anyone know why this issue might be happening and how to overcome this?
Thanks in advance,
Jayadevan.
On Jun 1, 2009 6:51pm, jayadeva...@gmail.com wrote:
Thanks W,
I tried it out ,But didn't get any performance improvement :(
The issue might be that I am inserting too many objects into working
memory
jayadevan
On Jun 1, 2009 3:36pm, Wolfgang Laun wolfgang.l...@gmail.com> wrote:
> The first two patterns pair each driver assignment with each trip -
>
>
> which is quite a lot of work to do. (The infix "and" between the 2nd
>
>
> and 3rd pattern doesn't change this.) Also, the field restriction
>
>
> "tripId in ($tid)" is not the most efficient way.
>
>
>
>
>
> Try this:
>
>
>
>
>
> rule "Assignment Check"
>
>
> when
>
>
> $creVo: DriverAssignVO($drId: driverId, $tid1: tripId)
>
>
> $creVo: DriverAssignVO(driverId == $drId, $tid2: tripId != $tid1)
>
>
> $trAsgn1: TripVO( tripId == $tid1, $startDtmUtc: startDtmUtc,
>
>
> $endDtmUtc: endDtmUtc)
>
>
> $trAsgn2: TripVO( tripId == $tid2,
>
>
> ((startDtmUtc >= $startDtmUtc && startDtmUtc
>
> (endDtmUtc >= $startDtmUtc && endDtmUtc
>
> then
>
>
> System.out.println("TRIP ID: " + $crvo.getTripId());
>
>
> end
>
>
>
>
>
> Here the first two patterns produce all pairs of assignments of a
>
>
> single driver, and the remainder checks for overlaps.
>
>
>
>
>
> You'll also find that this produces two symmetric firings for each
>
>
> overlap. It might be possible to avoid this by using "$tid2: tripId >
>
>
> $tid1" in the second pattern, the id's data type permitting.
>
>
>
>
>
> -W
>
>
>
>
>
>
>
>
> 2009/6/1 Mark Proctor mproc...@redhat.com>:
>
>
> > Please send these emails to the user list (in cc) so everyone can
help, not
>
>
> > directly to me.
>
>
> >
>
>
> > Mark
>
>
> > jayadevan m wrote:
>
>
> >
>
>
> > Hi
>
>
> >
>
>
> > We have one performance(memory) issue in drools-5
>
>
> >
>
>
> > Our Scenario
>
>
> >
>
>
> > We have 3 entities
>
>
> >
>
>
> > Trip - Entity representing details about trip
>
>
> >
>
>
> > Driver - Entity for driver , it contain details about driver
>
>
> >
>
>
> > Assignments - details about each assignments (one driver may assigned
to
>
>
> > many trip)
>
>
> >
>
>
> > The rule is to find ,"Find overlapping between trip assignments"
>
>
> >
>
>
> > For Implementing this we take the Trip ,Driver And Assignments
entities
>
>
> > from Data base and put it into working memory
>
>
> >
>
>
> > For Small number of records this rule work well ,
>
>
> >
>
>
> > But we want to check it against 15000 driver ,331176 assignments and
12745
>
>
> > trips
>
>
> >
>
>
> > In that case it take huge amount of time for execution (rule firing )
>
>
> >
>
>
> >
>
>
> >
>
>
> > Rule is
>
>
> >
>
>
> > rule "Assignment Check"
>
>
> >
>
>
> > when
>
>
> >
>
>
> > $creVo: DriverAssignVO($drId: driverId ,$tid: tripId);
>
>
> >
>
>
> > $tripAssignment: TripVO(
>
>
> >
>
>
> > $tpid: tripId,
>
>
> >
>
>
> > $startDtmUtc: startDtmUtc,
>
>
> >
>
>
> > $endDtmUtc: endDtmUtc)
>
>
> >
>
>
> > and
>
>
> >
>
>
> > $trvo: TripVO(
>
>
> >
>
>
> > tripId != $tpid,
>
>
> >
>
>
> > tripId in ($tid),
>
>
> >
>
>
> > ((startDtmUtc >= $startDtmUtc && startDtmUtc
>
> > $endDtmUtc) ||
>
>
> >
>
>
> > (endDtmUtc >= $startDtmUtc && endDtmUtc
>
> > $endDtmUtc)));
>
>
> >
>
>
> > $crvo: DriverAssignVO($drvrId: driverId , driverId == $drId ,
>
>
> > tripId != $tid, tripId == $tpid)
>
>
> >
>
>
> > then
>
Re: Re: [rules-users] Re: Drools performance issue
Thanks W,
I tried it out ,But didn't get any performance improvement :(
The issue might be that I am inserting too many objects into working memory
jayadevan
On Jun 1, 2009 3:36pm, Wolfgang Laun wrote:
The first two patterns pair each driver assignment with each trip -
which is quite a lot of work to do. (The infix "and" between the 2nd
and 3rd pattern doesn't change this.) Also, the field restriction
"tripId in ($tid)" is not the most efficient way.
Try this:
rule "Assignment Check"
when
$creVo: DriverAssignVO($drId: driverId, $tid1: tripId)
$creVo: DriverAssignVO(driverId == $drId, $tid2: tripId != $tid1)
$trAsgn1: TripVO( tripId == $tid1, $startDtmUtc: startDtmUtc,
$endDtmUtc: endDtmUtc)
$trAsgn2: TripVO( tripId == $tid2,
((startDtmUtc >= $startDtmUtc && startDtmUtc
(endDtmUtc >= $startDtmUtc && endDtmUtc
then
System.out.println("TRIP ID: " + $crvo.getTripId());
end
Here the first two patterns produce all pairs of assignments of a
single driver, and the remainder checks for overlaps.
You'll also find that this produces two symmetric firings for each
overlap. It might be possible to avoid this by using "$tid2: tripId >
$tid1" in the second pattern, the id's data type permitting.
-W
2009/6/1 Mark Proctor mproc...@redhat.com>:
> Please send these emails to the user list (in cc) so everyone can help,
not
> directly to me.
>
> Mark
> jayadevan m wrote:
>
> Hi
>
> We have one performance(memory) issue in drools-5
>
> Our Scenario
>
> We have 3 entities
>
> Trip - Entity representing details about trip
>
> Driver - Entity for driver , it contain details about driver
>
> Assignments - details about each assignments (one driver may assigned to
> many trip)
>
> The rule is to find ,"Find overlapping between trip assignments"
>
> For Implementing this we take the Trip ,Driver And Assignments entities
> from Data base and put it into working memory
>
> For Small number of records this rule work well ,
>
> But we want to check it against 15000 driver ,331176 assignments and
12745
> trips
>
> In that case it take huge amount of time for execution (rule firing )
>
>
>
> Rule is
>
> rule "Assignment Check"
>
> when
>
> $creVo: DriverAssignVO($drId: driverId ,$tid: tripId);
>
> $tripAssignment: TripVO(
>
> $tpid: tripId,
>
> $startDtmUtc: startDtmUtc,
>
> $endDtmUtc: endDtmUtc)
>
> and
>
> $trvo: TripVO(
>
> tripId != $tpid,
>
> tripId in ($tid),
>
> ((startDtmUtc >= $startDtmUtc && startDtmUtc
> $endDtmUtc) ||
>
> (endDtmUtc >= $startDtmUtc && endDtmUtc
> $endDtmUtc)));
>
> $crvo: DriverAssignVO($drvrId: driverId , driverId == $drId ,
> tripId != $tid, tripId == $tpid)
>
> then
>
> System.out.println("TRIP ID: " + $crvo.getTripId());
>
> end
>
>
>
> thanks and regards
>
> ___
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>
>
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Re: [rules-users] rule using sliding window
Hi
The description you have bellow is ambiguous, so I can't give you a
definitive answer. But it seems to be that you don't need sliding windows
for that. Simple temporal operators will do.
> Secondly if the window is large and number of records coming in is high
then could there be a memory issue?
Yes, Drools does not manages persistence by itself. So, if your design
must support more data than it would fit in your running environment memory,
you need to design a solution that comprises persistence.
> Also since every record is getting stored in database, can I not use the
database directly instead of sliding window?
Yes, you can fetch data on demand from external sources, be it databases
or anything else. Look at the "from" CE.
[]s
Edson
2009/6/1 Bhushan Bhangale
> I am using Drools 5. I am struggling to write rule for this logic -
>
> If a stock price changes more than 10% within an hour then report the
> change.
>
> I understand I have to use sliding window feature but unable to write the
> rule.
>
> For example I got an update for IBM stock @ 12:30 for price 100 and then
> another update IBM stock @ 12:35 for price 111. Since the time difference
> is within an hour and the change is also greater than 10% I want to report
> this price change.
>
>
>
> Stock class -
>
>
>
> Public class Stock {
>
>Private String stock;
>
>Private double price;
>
>Private Date time;
>
>Private double priceChange;
>
>Private Boolean highlight;
>
> }
>
>
>
>
>
> rule "Stock Price change more than 10% within an hour"
>
>
>
> when
>
>
>
> then
>
> set the priceChange attribute of Stock object
>
> set highlight to true
>
> end
>
>
>
>
>
> Secondly if the window is large and number of records coming in is high
> then could there be a memory issue?
>
>
>
> Also since every record is getting stored in database, can I not use the
> database directly instead of sliding window?
>
>
>
> Thanks
>
>
>
> *Mr. Bhangale Bhushan*
> *Associate Manager*
> *Kale Consultants Ltd.*
> bhushan_bhang...@kaleconsultants.com
> tel: +91 (0)206 608
> 3777
> http://www.kaleconsultants.com
>
>
>
>
>
>
>
>
>
> Disclaimer: This email (including any attachments) is intended for the sole
> use of the recipient/s and may contain material that is CONFIDENTIAL. Any
> unauthorized disclosure / copying / distribution or forwarding of this message
> or part is STRICTLY PROHIBITED. If you have erroneously received this message,
> please delete it immediately and notify the sender. No liability is assumed
> for
> any errors and/or omissions in the contents of this message. Information in
> this message that does not relate to the official business of this Company
> shall be understood as neither given nor endorsed by it. If verification is
> required please request a hard-copy version.
>
> To know more about Kale Consultants, visit www.kaleconsultants.com
>
> --
>
>
>
>
>
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>
--
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Re: re[rules-users] move hardcoded values in DRL or have constants inside drl
Karthizap, The only thing I could think of for you is to use a function in the DRL to store your "name" value, but any solution where you change your DRL will require you to redeploy the DRL file (obviously). Since your "name" changes quite often, can't you make it a fact of your reasoning process? Just to keep with the "Person" theme, make a helper class called AssignedName or something like that and do: when AssignedName( $an : name ) Person( name == $an ) then end This will even prevent re-deployments of the DRL itself. Also, a join like the above has cost O(1), so extremely good perf also (better than a function call). Drools does not support constants declaration in the DRL file, as you know, but maybe this is something we could add. Do you want to open a JIRA with a feature request for that? (That would still require DRL redeployment discussed above, obviously). Edson 2009/6/1 karthizap > > Thanks for your reply Earnie. In the following example, don't want to > hardcode Person Name value like "John" in the DRL file. I want to refer it > from some other sources(If i refer it from java class file, name value is > getting changed quiet often, have to recompile the java source and deploy). > My main requirement is, if the name value is getting changed, don't want to > redeploy/restart the application. i would like to do the changes in the drl > file only without hard coding. > > > rule "Test Rule" > >when >$person : Person( name == "John") >then >$person.setActivation(true) > > end > > Karthikeyan > > Please explain, how i can refer global object in LHS? > > > Earnie D wrote: > > > > How about adding them as Globals and referencing them that way? You > should > > be able to put them in a map as well in a Global and reference them. > > > > Earnie! > > > > > > > > > > > > From: karthizap > > To: rules-users@lists.jboss.org > > Sent: Monday, June 1, 2009 7:14:56 AM > > Subject: re[rules-users] move hardcoded values in DRL or have constants > > inside drl > > > > Is there is anyway i can remove hardcoded values in the DRL file? Can I > > have the constants file(like data dictionary) inside drl/functions. I > > don't want to refer java constants class directly in drl file and would > > like to declare and refer those constants inside drl file. > > > > View this message in context: remove hardcoded values in DRL or have > > constants inside drl > > Sent from the drools - user mailing list archive at Nabble.com. > > > > ___ > > rules-users mailing list > > rules-users@lists.jboss.org > > https://lists.jboss.org/mailman/listinfo/rules-users > > > > > > -- > View this message in context: > http://www.nabble.com/remove-hardcoded-values-in-DRL-or-have-constants-inside-drl-tp23813412p23814041.html > Sent from the drools - user mailing list archive at Nabble.com. > > ___ > rules-users mailing list > rules-users@lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > -- Edson Tirelli JBoss Drools Core Development JBoss, a division of Red Hat @ www.jboss.com ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: [rules-users] DRL - Accessors that take arguments
For arbitrary method calls, the only way is to use an eval:
VO( eval( computePrice("key") < 10 ) )
Although, if you have a method that returns a map, you can use simplified
Map syntax:
class VO {
...
public Map getComputeMap() {...}
}
Then:
VO( computeMap["key"] < 10 )
[]s
Edson
2009/6/1 Vidya Chandrasekaran
>
> Hi,
>
> I am fairly new to Drools and am just getting my feet wet with writing
> rules.
>
> In my work, I have to integrate drools with classes that do not expose all
> properties via getXXX/ isXXX accessor methods but require a call of the form
> someMethod("keyvalue"). I have been using the MVEL dialect and do not see a
> way to call a function with arguments on the LHS side of a rule either in
> the documentation or the mailing list.
>
>
> In fact, I have been trying something like
>
> rule "rulename"
> agenda-group "evaluation"
> when
> $d: VO( computePrice("key") < 10) from entry-point "Inventory
> stream"
> then
> #
> end
>
> This fails with a 'no viable alternative at input '"key"' in rule. Is there
> a way this can be accomplished?
>
> Thanks,
> Vidya
>
> ___
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>
>
--
Edson Tirelli
JBoss Drools Core Development
JBoss, a division of Red Hat @ www.jboss.com
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[rules-users] Resend: A Question about roadmap on integration between Drools and Apache ODE
Title: Samsung Enterprise Portal mySingle Hi. I'm working for Samsung SDS in Korea as a project leader and in contemplation using Apache ODE and Drools. When I was googling I saw your mail as below (Plz see bold) then I have a question about integration between Apache ODE and Drools. I'd like to use Apache ODE as a business flow and Drools as a business rules on my project because I think BPEL is a standard tools representing business flow. In details I'd like to implement in the way some node in BPEL flow can call Drools business rules. Would you give me the information about whether and when you're planned to integrate apache ODE into Drools? Thank you in advance JongGeuk Umesh Wankhede wrote: Mark Proctor wrote: Umesh Wankhede wrote: Mark Proctor wrote: Umesh Wankhede wrote: Hi I am trying to evaluate various features (rules and workflow) of Drools 5.0. What I understand from docs (drools-docs-flow.pdf - page 5) is that the Drools flow engine is based on generic process engine that allows the execution of different process languages like RuleFlow, BPEL, OSWorkflow, etc. Although I am able to do PoC (Proof of Concept) with RuleFlow, there isn't any documentation/samples available for using BPEL as process language. Also I don't find any more information on blogs, etc. If anyone has done something similar, please let me know, or any pointers would help. There is no BPEL product, Drools COULD do BPEL, but we haven't made it do so yet. It is more likely we would look to integrate an existing BPEL product like ODE, as the execution engine is the easy bit, it's all the xml manipulations that are time consuming. So that means I would have to go with jBPM for BPEL support (and losing the advantage of tight rule engine integration provided in Drools). How far would be the BPEL support in Drools in the roadmap? If you are going to use BPEL I would recommend ODE, jBPM BPEL is not BPEL 2.0, but 1.0, which is very limited. ODE is likely to be the BPEL engine we integrated into Drools. More importantly though, have a good think on why it is you are using BPEL, as in reality it's generally too low level for end users to use effectively. The primary language would be RuleFlow or jPDL, but we are also looking at BPEL support (product requirements driven). So we have to make a choice between jBPM or Drools 5.0. The latter option looks more suitable for our requirement which provides tightly integrated rule support, but lack of BPEL support currently is making the decision tougher. If you are going to choose a BPEL product, make sure you choose one that supports BPEL 2.0, or you'll be shooting yourself in the foot, Apache ODE is the more complete BPEL 2.0 engine. Thanks Umesh Legal Notice: This transmission, including any attachments, is confidential, proprietary, and may be privileged. It is intended solely for the intended recipient. If you are not the intended recipient, you have received this transmission in error and you are hereby advised that any review, disclosure, copying, distribution, or use of this transmission, or any of the information included therein, is unauthorized and strictly prohibited. If you have received this transmission in error, please immediately notify the sender by reply and permanently delete all copies of this transmission and its attachments ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: re[rules-users] move hardcoded values in DRL or have constants inside drl
Thanks for your reply Earnie. In the following example, don't want to hardcode Person Name value like "John" in the DRL file. I want to refer it from some other sources(If i refer it from java class file, name value is getting changed quiet often, have to recompile the java source and deploy). My main requirement is, if the name value is getting changed, don't want to redeploy/restart the application. i would like to do the changes in the drl file only without hard coding. rule "Test Rule" when $person : Person( name == "John") then $person.setActivation(true) end Karthikeyan Please explain, how i can refer global object in LHS? Earnie D wrote: > > How about adding them as Globals and referencing them that way? You should > be able to put them in a map as well in a Global and reference them. > > Earnie! > > > > > > From: karthizap > To: rules-users@lists.jboss.org > Sent: Monday, June 1, 2009 7:14:56 AM > Subject: re[rules-users] move hardcoded values in DRL or have constants > inside drl > > Is there is anyway i can remove hardcoded values in the DRL file? Can I > have the constants file(like data dictionary) inside drl/functions. I > don't want to refer java constants class directly in drl file and would > like to declare and refer those constants inside drl file. > > View this message in context: remove hardcoded values in DRL or have > constants inside drl > Sent from the drools - user mailing list archive at Nabble.com. > > ___ > rules-users mailing list > rules-users@lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > -- View this message in context: http://www.nabble.com/remove-hardcoded-values-in-DRL-or-have-constants-inside-drl-tp23813412p23814041.html Sent from the drools - user mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: re[rules-users] move hardcoded values in DRL or have constants inside drl
But assigning a value to a global isn't straightforward - you can't do it in the declaration. You'll have to do it from the application (or use some dirty hack, in a start-up rule); either way it's separate from the declaration. IMHO, using a Java class with public static final is definitely cleaner. -W 2009/6/1 Earnest Dyke : > How about adding them as Globals and referencing them that way? You should > be able to put them in a map as well in a Global and reference them. > > Earnie! > > > From: karthizap > To: rules-users@lists.jboss.org > Sent: Monday, June 1, 2009 7:14:56 AM > Subject: re[rules-users] move hardcoded values in DRL or have constants > inside drl > > Is there is anyway i can remove hardcoded values in the DRL file? Can I have > the constants file(like data dictionary) inside drl/functions. I don't want > to refer java constants class directly in drl file and would like to declare > and refer those constants inside drl file. > > View this message in context: remove hardcoded values in DRL or have > constants inside drl > Sent from the drools - user mailing list archive at Nabble.com. > > ___ > rules-users mailing list > rules-users@lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
Re: re[rules-users] move hardcoded values in DRL or have constants inside drl
How about adding them as Globals and referencing them that way? You should be able to put them in a map as well in a Global and reference them. Earnie! From: karthizap To: rules-users@lists.jboss.org Sent: Monday, June 1, 2009 7:14:56 AM Subject: re[rules-users] move hardcoded values in DRL or have constants inside drl Is there is anyway i can remove hardcoded values in the DRL file? Can I have the constants file(like data dictionary) inside drl/functions. I don't want to refer java constants class directly in drl file and would like to declare and refer those constants inside drl file. View this message in context: remove hardcoded values in DRL or have constants inside drl Sent from the drools - user mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
re[rules-users] move hardcoded values in DRL or have constants inside drl
Is there is anyway i can remove hardcoded values in the DRL file? Can I have the constants file(like data dictionary) inside drl/functions. I don't want to refer java constants class directly in drl file and would like to declare and refer those constants inside drl file. -- View this message in context: http://www.nabble.com/remove-hardcoded-values-in-DRL-or-have-constants-inside-drl-tp23813412p23813412.html Sent from the drools - user mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] rule using sliding window
I am using Drools 5. I am struggling to write rule for this logic -
If a stock price changes more than 10% within an hour then report the
change.
I understand I have to use sliding window feature but unable to write the
rule.
For example I got an update for IBM stock @ 12:30 for price 100 and then
another update IBM stock @ 12:35 for price 111. Since the time difference is
within an hour and the change is also greater than 10% I want to report this
price change.
Stock class -
Public class Stock {
Private String stock;
Private double price;
Private Date time;
Private double priceChange;
Private Boolean highlight;
}
rule "Stock Price change more than 10% within an hour"
when
then
set the priceChange attribute of Stock object
set highlight to true
end
Secondly if the window is large and number of records coming in is high then
could there be a memory issue?
Also since every record is getting stored in database, can I not use the
database directly instead of sliding window?
Thanks
Mr. Bhangale Bhushan
Associate Manager
Kale Consultants Ltd.
bhushan_bhang...@kaleconsultants.com
tel:
+91 (0)206 608
3777
http://www.kaleconsultants.com
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[rules-users] DRL - Accessors that take arguments
Hi,
I am fairly new to Drools and am just getting my feet wet with writing
rules.
In my work, I have to integrate drools with classes that do not expose all
properties via getXXX/ isXXX accessor methods but require a call of the form
someMethod("keyvalue"). I have been using the MVEL dialect and do not see a
way to call a function with arguments on the LHS side of a rule either in
the documentation or the mailing list.
In fact, I have been trying something like
rule "rulename"
agenda-group "evaluation"
when
$d: VO( computePrice("key") < 10) from entry-point "Inventory
stream"
then
#
end
This fails with a 'no viable alternative at input '"key"' in rule. Is there
a way this can be accomplished?
Thanks,
Vidya
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Re: [rules-users] Re: Drools performance issue
The first two patterns pair each driver assignment with each trip -
which is quite a lot of work to do. (The infix "and" between the 2nd
and 3rd pattern doesn't change this.) Also, the field restriction
"tripId in ($tid)" is not the most efficient way.
Try this:
rule "Assignment Check"
when
$creVo: DriverAssignVO($drId: driverId, $tid1: tripId)
$creVo: DriverAssignVO(driverId == $drId, $tid2: tripId != $tid1)
$trAsgn1: TripVO( tripId == $tid1, $startDtmUtc: startDtmUtc,
$endDtmUtc: endDtmUtc)
$trAsgn2: TripVO( tripId == $tid2,
((startDtmUtc >= $startDtmUtc && startDtmUtc <= $endDtmUtc) ||
(endDtmUtc >= $startDtmUtc && endDtmUtc <= $endDtmUtc)));
then
System.out.println("TRIP ID: " + $crvo.getTripId());
end
Here the first two patterns produce all pairs of assignments of a
single driver, and the remainder checks for overlaps.
You'll also find that this produces two symmetric firings for each
overlap. It might be possible to avoid this by using "$tid2: tripId >
$tid1" in the second pattern, the id's data type permitting.
-W
2009/6/1 Mark Proctor :
> Please send these emails to the user list (in cc) so everyone can help, not
> directly to me.
>
> Mark
> jayadevan m wrote:
>
> Hi
>
> We have one performance(memory) issue in drools-5
>
> Our Scenario
>
> We have 3 entities
>
> Trip - Entity representing details about trip
>
> Driver - Entity for driver , it contain details about driver
>
> Assignments - details about each assignments (one driver may assigned to
> many trip)
>
> The rule is to find ,"Find overlapping between trip assignments"
>
> For Implementing this we take the Trip ,Driver And Assignments entities
> from Data base and put it into working memory
>
> For Small number of records this rule work well ,
>
> But we want to check it against 15000 driver ,331176 assignments and 12745
> trips
>
> In that case it take huge amount of time for execution (rule firing )
>
>
>
> Rule is
>
> rule "Assignment Check"
>
> when
>
> $creVo: DriverAssignVO($drId: driverId ,$tid: tripId);
>
> $tripAssignment: TripVO(
>
> $tpid: tripId,
>
> $startDtmUtc: startDtmUtc,
>
> $endDtmUtc: endDtmUtc)
>
> and
>
> $trvo: TripVO(
>
> tripId != $tpid,
>
> tripId in ($tid),
>
> ((startDtmUtc >= $startDtmUtc && startDtmUtc <=
> $endDtmUtc) ||
>
> (endDtmUtc >= $startDtmUtc && endDtmUtc <=
> $endDtmUtc)));
>
> $crvo: DriverAssignVO($drvrId: driverId , driverId == $drId ,
> tripId != $tid, tripId == $tpid)
>
> then
>
> System.out.println("TRIP ID: " + $crvo.getTripId());
>
> end
>
>
>
> thanks and regards
>
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[rules-users] Re: Drools performance issue
Please send these emails to the user list (in cc) so everyone can help,
not directly to me.
Mark
jayadevan m wrote:
Hi
We have one performance(memory) issue in drools-5
Our Scenario
We have 3 entities
Trip - Entity representing details about trip
Driver - Entity for driver , it contain details about driver
Assignments - details about each assignments (one driver may assigned
to many trip)
The rule is to find ,"Find overlapping between trip assignments"
For Implementing this we take the Trip ,Driver And Assignments
entities from Data base and put it into working memory
For Small number of records this rule work well ,
But we want to check it against 15000 driver ,331176 assignments and
12745 trips
In that case it take huge amount of time for execution (rule firing )
Rule is
rule "Assignment Check"
when
$creVo: DriverAssignVO($drId: driverId ,$tid: tripId);
$tripAssignment: TripVO(
$tpid: tripId,
$startDtmUtc: startDtmUtc,
$endDtmUtc: endDtmUtc)
and
$trvo: TripVO(
tripId != $tpid,
tripId in ($tid),
((startDtmUtc >= $startDtmUtc &&
startDtmUtc <= $endDtmUtc) ||
(endDtmUtc >= $startDtmUtc && endDtmUtc <=
$endDtmUtc)));
$crvo: DriverAssignVO($drvrId: driverId , driverId ==
$drId , tripId != $tid, tripId == $tpid)
then
System.out.println("TRIP ID: " + $crvo.getTripId());
end
thanks and regards
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