[rules-users] Activation-group and salience

[Wolfgang Laun]

The full reason why the second one fires, although it is in the same
activation group:

. insert Transaction with amount < 100
. there are activations for both rules
. rule 1 fires, cancelling the actication for rule 2 (due to AG "Group1"
. rule 1 updates the matched transaction, causing another activation
of rule 2 (no-loop prohibits this for rule 1)

Advice:
  * Do not rely on salience, no-loop, activation groups. This is
obfuscating your mind, distracting you from the basics, i.e., logic.
  * Add constraints, clearly outlining the case when 1 and when 2 should fire.

rule 1:
  $tx:Transaction(amount < 100, ! status)

rule 2:
   $tx:Transaction(amount >= 100 )

-W

On 28/03/2014, Nicolas Héron <nicolas.heron.java at gmail.com> wrote:
> Hi
> why should rule2 be ignored ?
> when            $tx:Transaction();
> So it is true whatever is in transaction.
> Cheers
> Nicolas
>
>
> 2014-03-28 16:37 GMT+01:00 007reader [via Drools] <
> ml-node+s46999n4029009h12 at n3.nabble.com>:
>
>> I have a group of rules marked with "activation-group" where I want only
>> one rule to fire and ignore the rest. I also want to evaluate rules in
>> particular order, so I use salience to prioritize the rules within the
>> group. Here are my rules:
>>
>> rule "rule1"
>>         no-loop
>>         salience 100
>>         activation-group "Group1"
>>         when
>>         $tx:Transaction(amount < 100);
>>     then
>>         $tx.setStatus(true);
>>         update($tx);
>> end
>>
>> rule "rule2"
>>         salience -50
>>         activation-group "Group1"
>>         when
>>                 $tx:Transaction();
>>         then
>>                 System.out.println("catch all: "+$tx.toString());
>> end
>>
>> I expect that if Transaction amount<100, then rule1 will fire, and rule2
>> ignored. However both rules get executed. What am I doing wrong?
>>
>> Thx
>>
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> -----
> Nicolas Héron
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