[rules-users] modify and update is not working in the rule file

[Davide Sottara]

*DISCLAIMER: PLEASE NOTICE THAT THIS IS NOT RECOMMENDED, AND IN ANY CASE
SHOULD BE DONE WITH ***EXTREME*** CARE.*

This said, you need to create a KnowledgeBase passing a
RuleBaseConfiguration. 
Take a look at RuleBaseConfiguration.getComponentFactory(), which returns a
ReteooComponentFactory.
This class controls the sub-factories used to build parts of the RETE
network. In particular, you will
need to hack the NodeFactory (guess what it does :))

So, in reverse order: 

- Create a KnowledgeBase using a custom configuration
/KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase( rbc );/

- When you create the configuration, do not use the interface, but the
actual implementation
/RuleBaseConfiguration rbc = (RuleBaseConfiguration)
KnowledgeBaseFactory.newKnowledgeBaseConfiguration();/

- Set a custom NodeFactory in the configuration
/rbc.getComponentFactory().setNodeFactoryProvider( myNodeFactory );/

- The nodefactory should extend the appropriate methods and returned
customized nodes.
For example, to hack the alpha nodes:
/org.drools.reteoo.builder.NodeFactory myNodeFactory = new
DefaultNodeFactory() {
  public AlphaNode buildAlphaNode(int id, AlphaNodeFieldConstraint
constraint, ObjectSource objectSource, BuildContext context) {
    return new MyAlphaNode( /* args from super constructor here */ );
  }
};/

- Your custom nodes should add the desired behaviour. For example, the
custom AlphaNode
could override the "assertObject" method
( see :
https://github.com/droolsjbpm/drools/blob/master/drools-core/src/main/java/org/drools/reteoo/AlphaNode.java
)

/
...
if ( isAllowed(...) ) {
  ...
} else {
  // not present in the original
  // here, a particular object failed to satisfy a given constraint
}
/





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