Decision table problem
by Alex Esmann
Hey
I am using drools with a decision table (XLS). One of the conditions in
the table is a call to a java method, c.checkFoo($1,$2)), where c is of
type Foo. When I first created this method it took 2 integers and that
worked fine, now I need to update it to take to strings instead. I have
updated the method but when trying to it I get some errors.
Some examples of values in the cells for this condition are
[ 901, 910 ]
[ 90AAA, 90ABC]
For the first value I get this error:
The method checkFoo(String, String) in the type Foo is not applicable
for the arguments (int, int)
For the second value I get this error:
The method checkFoo(String, String) in the type Foo is not applicable
for the arguments (int, int)
Syntax error on token "AAA", delete this token
Syntax error on token "AAC", delete this token
How do I convince drools that the values in the cells should be read as
strings and not integers?
Kind Regards
Alex
16 years, 10 months
Collecting / sorting by the number of matches
by KDR
Hi, ta very much everyone for the help so far.
Another question - how to sort by number of matches please?
Say I have objects A, B, C and D and rules 1 to 5. Each object can match
each rule independently e.g. A can match rule 1 and 2, B might match all
rules 1 to 5, C might match none, D rules 3 and 4 etc.
I need to rank them and then print out info about them in order of number of
matches, with an indication of which rules matched, i.e. print info on B
before A but nothing at all on C, etc.
In Java I'd probably do it by having, as a global variable, a map where the
key is the name or ID field of the object and the value is an arraylist
which gets added to in the consequence (with a string about what kind of
match it was i.e. which rule was matched) whenever there's a match on a rule
for that object. Then sort it by descending length of the arraylists.
There has to be a better and more elegant way of doing it in Drools,
probably involving collecting info on the matches and then sorting them, but
I can't think what or how.
Does anyone have any thoughts or suggestions please?
Many thanks in advance.
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16 years, 10 months
(no subject)
by Nilima R
Hi,
I am new to Drools. Can anyone help me with an example of Drools in
jsp/servlets.
Thanks,
Nilima Rajendra Raichandani
Tata Consultancy Services
Mailto: nilima.r(a)tcs.com
Website: http://www.tcs.com
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16 years, 10 months
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16 years, 10 months
Unique events / facts in working memory
by Justin King
I'm building an application that will over time record changes in a certain
component (not at any set interval, could occur any time). The component can
possibly be uniquely identified via some kind of id. Is there a way that
when I insert an event / fact recording a change of state in this component
I can remove the previous one, so as there is only ever one fact / event
recording the current state of the component. If the previous one existed it
may cause rules to fire which should not.
Cheers,
Justin
16 years, 10 months
Is "emptieness" supported in Drools 5 (LHS)
by Pegram, Macon
According to MVEL they've added a convenience for checking the
"emptiness" of a value (see: http://mvel.codehaus.org/Value+Tests )
In MVEL you'd simply write: myMap == empty
This seemed like a MUCH cleaner way to write some of the LHS of the
rules, so I thought I'd try it out.
Given the following rule:
rule "Check Empties - Original"
when
$grabBag : MyGrabBag(someMap != null)
eval ($grabBag.getSomeMap().size() == 0)
then
end
This could be rewritten:
rule "Check Empties - Simple"
when
MyGrabBag(someMap == empty)
then
end
The IDE (Eclipse 3.4.2 w/ Drools plugin) seems to recognize "empty" is
a keyword (it makes it bold), but the drools compiler in the IDE
reports:
BuildError: Unable to create restriction '[VariableRestriction: == empty
]' for field 'someMap' in the rule 'Check Empties - Simple'
BuildError: Unable to return Declaration for identifier 'empty'
Am I assuming incorrectly that the LHS is fully MVEL compliant?
16 years, 10 months
Re: [rules-users] Collect from
by Greg Barton
Try this:
rule "FindMismatchedBars"
when
f : Foo(fooId : id)
bars : ArrayList() from collect( Bar(id != fooId) )
then
System.out.println( "For " + f + " got " + bars );
end
And see attached project.
--- On Tue, 8/18/09, techy <techluver007(a)gmail.com> wrote:
> From: techy <techluver007(a)gmail.com>
> Subject: Re: [rules-users] Collect from
> To: rules-users(a)lists.jboss.org
> Date: Tuesday, August 18, 2009, 12:07 PM
>
> Please someone help me on this.
>
> techy wrote:
> >
> > I would like to collect All Foo() for which there is
> no Bar() as given
> > below.Please help me on this.
> > Thanks.
> >
> > //psedo rule
> > rule 'test'
> > list : from collect( Foo(fooId: id) and not Bar(id
> !=fooId))
> > then
> > //do conseq
> > end
> >
>
> --
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> Sent from the drools - user mailing list archive at
> Nabble.com.
>
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16 years, 10 months
How to change default Persistence Manager , Hibernate in Drools Flow to OFBiz entityengine persistence manager
by Pardeep.Ruhil＠lntinfotech.com
Hi Users,
I have a doubt regarding the persistance mechnanism in Drools Flow.
By default drools flow supports Hibernate as persistence manager.</DIV><DIV>Now I am integrating Drools Flow with OFBiz and OFBiz uses entityengine as a persistence manager.
"http://ofbiz.apache.org/docs/entity.html"
Now I have seen in the docs that persistence manager can be changed by changing the
default setting in persistence.xml.
So can you please tell me what are the things I have to do to use my persistence manager and use Mysql database instead of file-based H2database.
Also is this possible to use OFBiz pesistence manager here?
Please help me to achieve this as it is very urgent.
Thanks & Regards
Pardeep Ruhil
L&T Infotech Ltd
Mumbai
Ph: +919820283884
Larsen & Toubro Infotech Ltd.
www.Lntinfotech.com
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16 years, 10 months
