[jboss-jira] [JBoss JIRA] Created: (JBRULES-2541) KnowledgeAgent: Add the possibility to add custom KnowledgeBuilderConfiguration

[Esteban Aliverti (JIRA)]

KnowledgeAgent: Add the possibility to add custom KnowledgeBuilderConfiguration  
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                 Key: JBRULES-2541
                 URL: https://jira.jboss.org/browse/JBRULES-2541
             Project: Drools
          Issue Type: Feature Request
      Security Level: Public (Everyone can see)
          Components: drools-api, drools-core
    Affects Versions: 5.1.0.M2
            Reporter: Esteban Aliverti
            Assignee: Esteban Aliverti


KnowledgeAgentImpl works in two ways according to newInstance config parameter:

When newInstance = true:
   Every time the agent detects a modification in a monitored resuorce, a new KBase is created, and all the modifications are applied there. If a previous KBase exists (If a KBase was passed to the constructor), the KnowledgeBaseConfiguration object of the original KBase is reused when the new KBase is created.

When newInstance = false:
   The KnowledgeBase is never recreated. If no KBase was supplied on constructor, a new KBase is created and reused thereafter. If a KBase is passed, it is used every time the KAgent processes a change set. 

Whether newInstance = true or newInstance = false, the KBase used by the Kagent could have custom ClassLoaders, and that's fine. The problem is that if the KBase is using custom ClassLoaders is because the contained resources use classes defined outside the current ClassLoader. So, when one of this resources changes, the KAgent needs to compile it (if it is not already a PKG). The problem here is that the KBuilder used for compilation is a "fresh" KnowledgeBuilder without any custom ClassLoader thus, a Rule Compilation error occurs.
This problem also arise when newInstance=true and the modified resource is compiled previous to perform a binary diff.

So, the KnowledgeAgent needs to receive a KnowledgeBuilderConfiguration object that needs to be used in every internal builder the KAgent uses.

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