idfactory.java

网络游戏天堂1的java源代码。。。。。

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 *
 * http://www.gnu.org/copyleft/gpl.html
 */
package l1j.server.server;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.logging.Level;
import java.util.logging.Logger;

import l1j.server.L1DatabaseFactory;
import l1j.server.server.utils.SQLUtil;

public class IdFactory {
	private static l1j.eric.EricLogger _log =  l1j.eric.EricLogger.getLogger2(IdFactory.class.getName());

	private int _curId;

	private Object _monitor = new Object();

	private static final int FIRST_ID = 0x10000000;

	private static IdFactory _instance = new IdFactory();

	private IdFactory() {
		loadState();
	}

	public static IdFactory getInstance() {
		return _instance;
	}

	public int nextId() {
		synchronized (_monitor) {
			return _curId++;
		}
	}

	private void loadState() {
		// DBからMAXIDを求める
		Connection con = null;
		PreparedStatement pstm = null;
		ResultSet rs = null;

		try {
			con = L1DatabaseFactory.getInstance().getConnection();
			pstm = con
					.prepareStatement("select max(id)+1 as nextid from (select id from character_items union all select id from character_teleport union all select id from character_warehouse union all select id from character_elf_warehouse union all select objid as id from characters union all select clan_id as id from clan_data union all select id from clan_warehouse union all select objid as id from pets) t");
			rs = pstm.executeQuery();

			int id = 0;
			if (rs.next()) {
				id = rs.getInt("nextid");
			}
			if (id < FIRST_ID) {
				id = FIRST_ID;
			}
			_curId = id;
			_log.info("現在的對象ID："  + _curId);
		} catch (SQLException e) {
			_log.log(Level.SEVERE, e.getLocalizedMessage(), e);
		} finally {
			SQLUtil.close(rs);
			SQLUtil.close(pstm);
			SQLUtil.close(con);
		}
	}
}