code: public void removeWriter(String logService, LogWriter writer)
  	{
  		if (logService != null && logService.length() > 0) {
  			final LogService l = (LogService) loggers.get(logService);
  			if (l != null)
  				l.removeWriter(writer);
  		}
  		else
  			synchronized (loggers) {
  				if (writers.remove(writer))
  					for (final Iterator i = loggers.values().iterator(); i.hasNext();)
  						((LogService) i.next()).removeWriter(writer);
  			}
  	}
docs: Removes a log writer, either global or from a particular <code>logService</code>.
  <p>
  Note that for a writer to be removed global, it had to be added global before.
  
  @param logService name of the log service of which the writer will be removed; to
  remove the writer global, use an empty string or <code>null</code>
  @param writer log writer to remove
  @see LogService#removeWriter(LogWriter)