6:56 a.m.
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>:
>
> Edson,
>
> As you said i used inline eval. But am getting erroe message like this
> can't be used in static 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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