code: public void handlerAppears( IMonitoringHandler handler ) {
  
  		if( handler != null ) {
  			this.logger.info( "Monitoring handler '" + handler.getName() + "' is now available." );
  			this.handlers.add( handler );
  			listHandlers( this.handlers, this.logger );
  		}
  	}
docs: This method is invoked by iPojo every time a new monitoring handler appears.
  @param handler the appearing monitoring handler