[rules-users] multi-factor rule

[Vincent Legendre]

Or you can use Guvnor tables and "otherwise" special value (see doc on 
tables under guvnor)


Le 23/11/2011 17:14, FrankVhh a écrit :
> Hi,
>
> If you do not want to check for all alternative cases, you might need a
> showstopper to stop the firings of unwanted rules.
>
> This can be achieved by executing insert(new ShowStopper() ); in your RHS.
> All LHS of the rules will check for not( ShowStopper() )
>
> Alternatively, you can use the new -experimental - feature of drools called
> "declarative agenda". You could use this to block activations of rules
> directly.
>
> Also, be aware that relying on salience alone is very hard to maintain over
> time.
>
> Regards,
> Frank
>
>
> ronalbury wrote
>> Hi - I am a Drools newbie and I apologize in advance if the answer to my
>> question is intuitively obvious to the casual user.
>>
>> I have an object that has two fields: location(there are more than 50
>> locations) and age.  I am having difficulty building clean rules for the
>> following pseudo-code
>>
>>
>> // Rule One
>> if(location == "A") {
>>     if(age>  60)
>>        do_something();
>> }
>> // Rule Two
>> else if(location == "B") {
>>      if(age>  70)
>>          do_something();
>> }
>> // Rule Three
>> else if(location == "C") {
>>      if(age>  80)
>>          do_something();
>> }
>> // Rule Four
>> else {
>>      if(age>  65)
>>          do_something();
>> }
>>
>> The issue comes with Rule Four.  How do I avoid writing the rule so that I
>> don't have to say (location!="A"&&location!="B"&&location!="C") ?  I also
>> don't want to have to write an explicit rule for every possible location.
>>
>> I considered an activation-group with salience to have the rules executed
>> in order, but the problem is that if rules 1-3 do not fire, then rule 4
>> fires for all locations - I can get a hit if location=="C" and age==70.
>>
>> Is it possible to have a 'Map' and do something like
>> (age>map.get(location)) ?  I could live with creating a map with all
>> possible locations for key, although I'd rather not go this route.
>>
>> This problem is typical for the types of rules I'll be writing ... there
>> can be completely different sets of rule criteria depending on location.
>>
>>
>> Thanks in advance for your suggestions and your patience.
>>
>> _______________________________________________
>> rules-users mailing list
>> rules-users at .jboss
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>
> --
> View this message in context: http://drools.46999.n3.nabble.com/rules-users-multi-factor-rule-tp3531130p3531237.html
> Sent from the Drools: User forum mailing list archive at Nabble.com.
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users