Constructing Non-Persistent Dynamic Rules › Facilities for Constructing Non-Persistent Dynamic Rules

Facilities for Constructing Non-Persistent Dynamic Rules

The facilities required by Aion for building non-persistent dynamic rules are:

• The library DynRLib. This library provides the basic mechanisms for defining and posting non-persistent dynamic rules. These mechanisms include:
  • The DIMember class. The instances of this class are individual domain interface member objects that are referenced in a dynamic rule.
  • The XXXRule_Defn_Interface interface, where XXX represents a type of dynamic rule supported by Aion. These interfaces provide the methods by which a dynamic rule can be defined to the inference engine.
  • Posting facilities provided by XXXRule_Services, where 'XXX' represents a type of dynamic rule supported by Aion. Posting facilities provide the PostRule( ) method.

    Note: Currently Aion supports only dynamic decision tables. The only Rule Services provided by DynRLib is DecisionTableRule_Services and the only interface is DecisionTableRule_Defn_Interface.

• An application class that implements the methods specified in the XXXRule_Defn_Interface interface for the type of non-persistent rule that will be created in the application.
  • A non-persistent rule is created as an instance of the class that implements the XXXRule_Defn_Interface interface.
  • The methods of XXXRule_Defn_Interface are used by the posting facility to parse the values for the conditions and actions (DIMembers) comprising the non-persistent rule.
• Any additional application structures that may be necessary to implement the methods of the XXXRule_Defn_Interface interface.

  These structures provide the condition and action values that comprise the non-persistent rule and are used to associate these values with the domain interface members (instances of DIMember class) that are referenced in the rule.

• An agent (class) that has responsibility for constructing the non-persistent rule. This class, defined by the Aion application developer, typically also posts and inferences over rules.