[rules-users] Urgent..Dynamic nature of rules

[rouvas at di.uoa.gr]

Hi,

Assuming you can have your rules in a byte[], you can use something along
the lines of:

  bytes[] KB = ... your rules ...
  KnowledgeBuilderConfiguration builderConf =
KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration();
    KnowledgeBuilder kbuilder =
KnowledgeBuilderFactory.newKnowledgeBuilder(builderConf);
    kbuilder.add(ResourceFactory.newByteArrayResource(KB), ResourceType.DRL);
    KnowledgeBuilderErrors errors = kbuilder.getErrors();
    if (errors.size() > 0) {
      for (KnowledgeBuilderError error : errors) {
        System.err.println(error);
      }
      throw new IllegalArgumentException("Could not parse knowledge.");
    }
    KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
    kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
    StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
    try {
      ksession.fireAllRules();
    } finally {
      ksession.dispose();
    }

The above snippet can easily be modified for String representation of rules.

Hope it helps,
-Stathis

nkumar wrote:
>
> Hi,
>
> Is there any way to get the rules from external source rather than loading
> this from .drl file every time? because of changing behavior of the rules,
> rule file has to be changed if a user introduces a new rule in the system.
> Please help me out how can we solve this. i am new to drools and even i
> don't know how to write rules properly. Can we store this in a database or
> can we save rules somewhere so that next time rather than loading this
> from
> direct rule file, we load this from that data source. User of this
> application is non technical and i also need to make an interface to get
> the
> rules in plane English which will convert those into rules accordingly.
> Guvnor is not much user friendly. Can anyone please help me out. My
> deadline
> is near.
>
> this is the structure of the rule which i need to make after loading the
> data.
>
>         when
>                         b:Feature(featureClass.name=="FrontSuspension")
>                         c:Feature(featureClass.name=="FrontAxle")
>                         eval(b.attributes.Capacity>=c.attributes.Capacity)
>         then
>                         AvailabilityRuleState s = new
> AvailabilityRuleState();
>                         s.setValue("A");//Available
>                         s.setReason("");
>                         s.setReference("FA-FS:1");
>                         resultState.add(s);
>         end
>
>
> Please help me out. i will really appreciate your help.
>
> Thanks
>
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