[1.12.2] Sides issue

[dreemlees]

I am trying to create a mod that writes some player data into file.
I want the file to be updated only when logical server is starting up.
As I can see, @SidedProxy affects physical side only, and the file is not created on local server.
I've tried to use this way:
 

public static CommonProxy _proxy;

@EventHandler
public void preInit(FMLPreInitializationEvent event)
{
if(FMLCommonHandler.instance().getEffectiveSide() == Side.CLIENT) _proxy = new ClientProxy();
else _proxy = new ServerProxy();
_proxy.preInit(event);
}

...
//Other handlers
...

There ServerProxy.preInit() is:

public void init(FMLInitializationEvent e) 
	{
		System.out.println("init server!");
		ServerRegisterer.init(e);
		PlayerData.load();
	}

But now I don't know what to do with registering things: as I understand, I don't have to register anything on logical server when it is physically a client. (Because init methods of ServerProxy aren't called at all on the logical server)

So, what should I do?
I would be happy if there is a way of programming my mod, with only logical server-client separation.

 

[dreemlees]

18 minutes ago, diesieben07 said:

What kind of data are you trying to store? Usually writing your own files is unnecessarily complicated most of the time.

Thank you for your reply!
Multiplayer class system. I have to save some player lvls somewhere...