Monitor Plug-in ECom interface definition. Monitor plug-in implementation needs to inherit this class and implement the pure virtual methods which exist in this interface. All monitor plug-ins are provided a reference to the Harvester server ( MMonitorPluginObserver ) which hanles the new harvesting requests, open session to MdE for DB maintenance operations, pointer to ContextEngine and a pointer Harvester plug-in factory.

Example:

// interface for notifying Monitor plug-in about new files class MMonitorNotifier { public: /** * Called when we notice a new file/item * * // Monitor plug-in implementation class CMyMonitorPlugin: public CMonitorPlugin , public MMonitorNotifier { public: TBool StartMonitoring( MMonitorPluginObserver & aObserver, CMdESession* aMdEClient, CContextEngine* aCtxEngine, CHarvesterPluginFactory* aHarvesterPluginFactory ); TBool StopMonitoring() ; TBool ResumeMonitoring( MMonitorPluginObserver & aObserver, CMdESession* aMdEClient, CContextEngine* aCtxEngine, CHarvesterPluginFactory* aHarvesterPluginFactory ); TBool PauseMonitoring() ; void NewFile( CHarvesterData* aHarvesterData );

private: MMonitorPluginObserver* iObserver; CMyActiveObjectNotifier* iNotifier; }

TBool CMyMonitorPlugin::StartMonitoring( MMonitorPluginObserver & aObserver, CMdESession* aMdEClient, CContextEngine* aCtxEngine, CHarvesterPluginFactory* aHarvesterPluginFactory ) { iObserver =

// Active object which observes the system and notices new files/items in the system iNotifier = CMyActiveObjectNotifier::NewL(*this); } TBool CMyMonitorPlugin::StopMonitoring() { iNotifier->StopNotifying(); }

TBool CMyMonitorPlugin::ResumeMonitoring( MMonitorPluginObserver & aObserver, CMdESession* aMdEClient, CContextEngine* aCtxEngine, CHarvesterPluginFactory* aHarvesterPluginFactory ) { // Do what needs to be done when operation is resumed - for example handle // events received through callback CMyMonitorPlugin::NewFile during pause. }

TBool CMyMonitorPlugin::PauseMonitoring() { // Do what needs to be done during pause - for example buffer all events coming // through callback CMyMonitorPlugin::NewFile }

void CMyMonitorPlugin::NewFile( CHarvesterData* aHarvesterData ) { // Our CMyActiveObjectNotifier notifies us about new file and we notify the Harvester server about it. // Before this CMyActiveObjectNotifier has filled the need data to aHarvesterData like: aHarvesterData->SetEventType( EHarvesterAdd ); aHarvesterData->SetOrigin( aOrigin ); iObserver->MonitorEvent( aHarvesterData ); }