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@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@post.com>
        Subject: Re: [rules-users] RE: how to find duplicate inlineeval
        To: "Rules Users List" < rules-users@lists.jboss.org >
        Message-ID:
                <e6dd5ba30711140348p6da77e64kdac90cd313b5aa80@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@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@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
  Software Engineer - JBoss Rules Core Developer
  Office: +55 11 3529-6000
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