Set<String> s = disabledSubsystemsHolder.get( );
Set<String> s = data.get().disabledSubsystems;
    public static boolean addDisabled(String id)    {    	Set<String> s = disabledSubsystemsHolder.get( );    	if ( s == null )    	{    		s = new HashSet<String>();    		disabledSubsystemsHolder.set( s );    		return s.add(id);    	}    	return false;	    }