Xou_cfg_mgr.java

/*
XOWA: the XOWA Offline Wiki Application
Copyright (C) 2012-2017 gnosygnu@gmail.com

XOWA is licensed under the terms of the General Public License (GPL) Version 3,
or alternatively under the terms of the Apache License Version 2.0.

You may use XOWA according to either of these licenses as is most appropriate
for your project on a case-by-case basis.

The terms of each license can be found in the source code repository:

GPLv3 License: https://github.com/gnosygnu/xowa/blob/master/LICENSE-GPLv3.txt
Apache License: https://github.com/gnosygnu/xowa/blob/master/LICENSE-APACHE2.txt
*/
package gplx.xowa.users.cfgs; import gplx.*; import gplx.xowa.*; import gplx.xowa.users.*;
import gplx.dbs.*;
public class Xou_cfg_mgr {
	private Xou_cfg_tbl tbl;
	private final    Hash_adp hash = Hash_adp_.New();
	private final    Bry_bfr tmp_bfr = Bry_bfr_.New();
	public void Init_by_app(Db_conn conn) {
		tbl = new Xou_cfg_tbl(conn);
		tbl.Conn().Meta_tbl_assert(tbl);
		this.Reg(tbl.Select_by_usr_ctx(Usr__anonymous, Ctx__app));
	}
	public String Get_app_str_or(String key, String or) {	// NOTE: app-level is always loaded at start; don't check db
		synchronized (hash) {	// LOCK:app-level
			String uid = Bld_uid(tmp_bfr, Usr__anonymous, Ctx__app, key);
			Xou_cfg_itm itm = (Xou_cfg_itm)hash.Get_by(uid);
			return itm == null ? or : itm.Val();
		}
	}
	public void Set_app_bry(String key, byte[] val) {this.Set_app_str(key, String_.new_u8(val));}
	public void Set_app_str(String key, String val) {
		synchronized (hash) {	// LOCK:app-level
			// update val in reg
			String uid = Bld_uid(tmp_bfr, Usr__anonymous, Ctx__app, key);
			boolean insert = false;
			Xou_cfg_itm itm = (Xou_cfg_itm)hash.Get_by(uid);
			if (itm == null) {
				itm = new Xou_cfg_itm(Usr__anonymous, Ctx__app, key, val);
				hash.Add(uid, itm);
				insert = true;
			}
			itm.Val_(val);

			// save to db
			tbl.Upsert(insert, itm.Usr(), itm.Ctx(), itm.Key(), itm.Val());
		}
	}

	private void Reg(Xou_cfg_itm[] itms) {
		synchronized (hash) {	// LOCK:app-level
			for (Xou_cfg_itm itm : itms)
				hash.Add(itm.Uid(), itm);
		}
	}

	private static final int Usr__anonymous = 1;
	private static final String Ctx__app = "app";
	public static String Bld_uid(int usr, String ctx, String key) {
		return String_.Concat(Int_.To_str(usr), "|", ctx, "|", key);
	}
	private static String Bld_uid(Bry_bfr tmp_bfr, int usr, String ctx, String key) {
		tmp_bfr.Add_int_variable(usr).Add_byte_pipe();
		tmp_bfr.Add_str_a7(ctx).Add_byte_pipe();
		tmp_bfr.Add_str_u8(key);
		return tmp_bfr.To_str_and_clear();
	}
}