Basha,
This is the correct behavior since both facts match both patterns (one
at a time). If you don't want them to fire 2 times, you need a way to tell
the engine there is an order on the facts. I.e., (A,B) is a valid tuple for
you, but (B,A) is not.
One way of doing that is if the facts have some ID attribute that can be
ordered:
$f1 : Message( $id1 : id, $m1 : message )
$f2 : Message( id $id1, $m2 : message == $m1, eval( $f1 != $f2 ) )
If your facts have no attribute that allow a user to establish an order
between them, then the only way is to use java system id to do that:
$f1 : Message( $m1 : message )
$f2 : Message( $m2 : message == $m1, eval( System.identityHashCode(
$f1 ) System.identityHashCode( $f2 ) ) )
[]s
Edson
2007/11/15, Sikkandar Nawabjan [EMAIL PROTECTED]:
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 = [EMAIL PROTECTED] [ message=Hello World ]
$f2 = [EMAIL PROTECTED] [ message=Hello World ]
FIRED DUPLICATE:
$f1 = [EMAIL PROTECTED] [ message=Hello World ]
$f2 = [EMAIL PROTECTED] [ message=Hello World ]
FIRED DIFFERENT:
$f1 = [EMAIL PROTECTED] [ message=Hello Bob ]
$f2 = [EMAIL PROTECTED] [ message=Hello World ]
FIRED DIFFERENT:
$f1 = [EMAIL PROTECTED] [ message=Hello World ]
$f2 = [EMAIL PROTECTED] [ message=Hello Bob ]
FIRED DIFFERENT:
$f1 = [EMAIL PROTECTED] [ message=Hello Bob ]
$f2 = [EMAIL PROTECTED] [ message=Hello World ]
FIRED DIFFERENT:
$f1 = [EMAIL PROTECTED] [ message=Hello World ]
$f2 = [EMAIL PROTECTED] [ message=Hello Bob ]
[]s
Edson
2007/11/14, Sikkandar Nawabjan [EMAIL PROTECTED]:
i just use this sort of rule
rule Hello World
dialect mvel
when
m : Message( $message1 : message )
mdup : Message($message2:message==$message1,eval(this!=m) )
then
System.out.println(Rule Fired+m +::+mdup );
System.out.println (Rule Fired+$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 Hello1.
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 [EMAIL PROTECTED]
Subject: Re: [rules-users] RE: how to find duplicate inlineeval
To: Rules Users List rules-users@lists.jboss.org
Message-ID:
[EMAIL PROTECTED]
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 [EMAIL PROTECTED]mailto:
[EMAIL PROTECTED] :
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.
