13.40. Convenience Methods using the Kcontext Variable

  • The call kcontext.getKnowledgeRuntime().halt() terminates rule execution immediately.
  • The accessor getAgenda() returns a reference to the session's Agenda, which in turn provides access to the various rule groups: activation groups, agenda groups, and rule flow groups. A fairly common paradigm is the activation of some agenda group, which could be done with the lengthy call: 
    // give focus to the agenda group CleanUp
kcontext.getKnowledgeRuntime().getAgenda().getAgendaGroup( "CleanUp" ).setFocus();
    (You can achieve the same using drools.setFocus( "CleanUp" ).)
  • To run a query, you call getQueryResults(String query), whereupon you may process the results.
  • A set of methods dealing with event management lets you add and remove event listeners for the Working Memory and the Agenda.
  • MethodgetKnowledgeBase() returns the KnowledgeBase object, the backbone of all the Knowledge in your system, and the originator of the current session.
  • You can manage globals with setGlobal(...), getGlobal(...) and getGlobals().
  • Method getEnvironment() returns the runtime's Environment.
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