[rules-users] RE: Duplicate check using dialect(firing multiple times)

[Sikkandar Nawabjan]

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 at 1b06041 [ message=Hello World ] 
      $f2 = com.sample.DroolsTest$Message at 1a001ff [ message=Hello World ]
FIRED DUPLICATE:
      $f1 = com.sample.DroolsTest$Message at 1a001ff [ message=Hello World ]
      $f2 = com.sample.DroolsTest$Message at 1b06041 [ message=Hello World ]
FIRED DIFFERENT:
      $f1 = com.sample.DroolsTest$Message at 1c6572b [ message=Hello Bob ]
      $f2 = com.sample.DroolsTest$Message at 1b06041 [ message=Hello World ]
FIRED DIFFERENT:
      $f1 = com.sample.DroolsTest$Message at 1b06041 [ message=Hello World ]
      $f2 = com.sample.DroolsTest$Message at 1c6572b [ message=Hello Bob ]
FIRED DIFFERENT:
      $f1 = com.sample.DroolsTest$Message at 1c6572b [ message=Hello Bob ] 
      $f2 = com.sample.DroolsTest$Message at 1a001ff [ message=Hello World ]
FIRED DIFFERENT:
      $f1 = com.sample.DroolsTest$Message at 1a001ff [ message=Hello World ]
      $f2 = com.sample.DroolsTest$Message at 1c6572b [ message=Hello Bob ]

    []s
    Edson



2007/11/14, Sikkandar Nawabjan <Sikkandar.Nawabjan at 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 at post.com>
	Subject: Re: [rules-users] RE: how to find duplicate inlineeval
	To: "Rules Users List" <rules-users at lists.jboss.org >
	Message-ID:
	        <e6dd5ba30711140348p6da77e64kdac90cd313b5aa80 at 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 at ust-global.com <mailto:Sikkandar.Nawabjan at 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 at 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
  Mobile: +55 11 9287-5646
  JBoss, a division of Red

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