code: @Override
  	protected void append(ILoggingEvent event) {
  		// Render the event according to layout
  		String formattedEvent = layout.doLayout(event);
  		// Prepare to be queued
  		this.le_async.addLineToQueue(formattedEvent);
  	}
docs: Implements AppenderSkeleton Append method, handles time and format
  
  @event event to log