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19.2. HelloWorld Example: Event Logging and Auditing


// setup the debug listeners
ksession.addEventListener( new DebugAgendaEventListener() );
ksession.addEventListener( new DebugWorkingMemoryEventListener() );
        
// setup the audit logging
KnowledgeRuntimeLogger logger =
  KnowledgeRuntimeLoggerFactory.newFileLogger(ksession, "log/helloworld");
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  • Two default debug listeners are supplied: DebugAgendaEventListener and DebugWorkingMemoryEventListener. These print out debug event information to the System.err stream displayed in the Console window.
  • The KnowledgeRuntimeLogger provides execution auditing which can be viewed in a graphical viewer. This logger is a specialised implementation built on the Agenda and Working Memory listeners.
  • When the engine has finished executing, logger.close() must be called.
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