11:12 p.m.
Edson,
With this code it is firing. But it is firing 2 times(u also got same 2 time output). why
is that? how we can avoid?
Thanks and Regss,
Basha
Sorry, my mistake. "this" is a reserved word in java (duh!!), and so you need
to use your own binding:
m : Message( $message1 : message )
mdup : Message($message2:message==$message1,eval(mdup != m) )
You can't use mvel dialect, because in MVEL the operators "==" and
"!=" will call the equals() method anyway.
Other than that, it is working just fine for me:
rule "Find duplicates"
salience 10
when
$f1 : Message( $m1 : message )
$f2 : Message( $m2 : message == $m1, eval( $f1 != $f2 ) )
then
System.out.println( "FIRED DUPLICATE:" );
System.out.println( " $f1 = "+$f1+" [
message="+$m1+" ]" );
System.out.println( " $f2 = "+$f2+" [
message="+$m2+" ]" );
end
rule "Find differents"
when
$f1 : Message( $m1 : message )
$f2 : Message( $m2 : message != $m1 )
then
System.out.println( "FIRED DIFFERENT:" );
System.out.println( " $f1 = "+$f1+" [
message="+$m1+" ]" );
System.out.println( " $f2 = "+$f2+" [
message="+$m2+" ]" );
end
The code to insert facts is:
Message message1 = new Message();
message1.setMessage( "Hello World" );
workingMemory.insert( message1 );
Message message2 = new Message();
message2.setMessage( "Hello World" );
workingMemory.insert( message2 );
Message message3 = new Message();
message3.setMessage( "Hello Bob" );
workingMemory.insert( message3 );
workingMemory.fireAllRules();
And the result is:
FIRED DUPLICATE:
$f1 = com.sample.DroolsTest$Message@1b06041 [ message=Hello World ]
$f2 = com.sample.DroolsTest$Message@1a001ff [ message=Hello World ]
FIRED DUPLICATE:
$f1 = com.sample.DroolsTest$Message@1a001ff [ message=Hello World ]
$f2 = com.sample.DroolsTest$Message@1b06041 [ message=Hello World ]
FIRED DIFFERENT:
$f1 = com.sample.DroolsTest$Message@1c6572b [ message=Hello Bob ]
$f2 = com.sample.DroolsTest$Message@1b06041 [ message=Hello World ]
FIRED DIFFERENT:
$f1 = com.sample.DroolsTest$Message@1b06041 [ message=Hello World ]
$f2 = com.sample.DroolsTest$Message@1c6572b [ message=Hello Bob ]
FIRED DIFFERENT:
$f1 = com.sample.DroolsTest$Message@1c6572b [ message=Hello Bob ]
$f2 = com.sample.DroolsTest$Message@1a001ff [ message=Hello World ]
FIRED DIFFERENT:
$f1 = com.sample.DroolsTest$Message@1a001ff [ message=Hello World ]
$f2 = com.sample.DroolsTest$Message@1c6572b [ message=Hello Bob ]
[]s
Edson
2007/11/14, Sikkandar Nawabjan <Sikkandar.Nawabjan(a)ust-global.com>:
i just use this sort of rule
rule "Hello World"
dialect "mvel"
when
m : Message( $message1 : message )
mdup : Message($message2:message==$message1,eval(this!=m) )
then
System.out.println("Rule Fired1111"+m +"::"+mdup );
System.out.println ("Rule Fired"+$message1 +"::"+$message2 );
end
if i put rule parameter dialect "MVEL" the error "this should be used in
static context" is gone. But now the rule is firing whatever may be the data
i assert 2 objects with message Hello and Hello11111.
still the rule is firing(2 times).
Thanks and regs,
basha
Message: 1
Date: Wed, 14 Nov 2007 09:48:02 -0200
From: "Edson Tirelli" < tirelli(a)post.com>
Subject: Re: [rules-users] RE: how to find duplicate inlineeval
To: "Rules Users List" <rules-users(a)lists.jboss.org >
Message-ID:
<e6dd5ba30711140348p6da77e64kdac90cd313b5aa80(a)mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Sorry, you lost me. What is the error message?
Can you send us a self contained test showing the problem you are having?
[]s
Edson
2007/11/14, Sikkandar Nawabjan < Sikkandar.Nawabjan(a)ust-global.com
<mailto:Sikkandar.Nawabjan@ust-global.com> >:
Edson,
As you said i used inline eval. But am getting erroe message like this
can't be used in static context.am <http://context.am/> using statelesssession
to assert my
objects.
i also put eval(this!=obj1) as follows.
$obj1:Object1($id:id,$name:name)
$obj2:Object1(id==$id,$name:name==$name, eval( this!=$obj1
)) eval($obj2!= $obj1)
Though my references are different the rule is not firing
Thanks and Regs
Basha
From: rules-users-bounces(a)lists.jboss.org on behalf of Edson Tirelli
Sent: Tue 11/13/2007 9:35 PM
To: Rules Users List
Subject: Re: [rules-users] RE: how to find duplicate
Sikkandar,
The only way to check for identity is to use an inline eval and use
java code to check that:
when
$obj1:Object1($id:id,$name:name)
$obj2:Object1(id==$id,$name:name==$name, eval( this!=$obj1 ))
then
Another option is to configure your rulebase to not allow the same
object to be matched by more than one pattern in your rules. To do that you
can either set a system property:
drools.removeIdentities = true
Or you can use drools API:
RuleBaseConfiguration conf = new RuleBaseConfiguration();
conf.setRemoveIdentities( true );
RuleBase rulebase = RuleBaseFactory.newRuleBase( conf );
If you do that, your rule can be written as this:
when
$obj1:Object1($id:id,$name:name)
$obj2:Object1(id==$id,$name:name==$name)
then
Since the engine will never allow the same fact to simultaneously match
both patterns.
[]s
Edson
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Edson Tirelli
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