com.l2jfree.gameserver.idfactory.StackIDFactory.java Source code

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Here is the source code for com.l2jfree.gameserver.idfactory.StackIDFactory.java

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/*
 * 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 3 of the License, 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, see <http://www.gnu.org/licenses/>.
 */
package com.l2jfree.gameserver.idfactory;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Stack;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.l2jfree.Config;
import com.l2jfree.L2DatabaseFactory;

/**
 * This class ...
 * 
 * @version $Revision: 1.3.2.1.2.7 $ $Date: 2005/04/11 10:06:12 $
 */
public class StackIDFactory extends IdFactory {
    private final static Log _log = LogFactory.getLog(IdFactory.class);

    private int _curOID;
    private int _tempOID;

    private final Stack<Integer> _freeOIDStack = new Stack<Integer>();

    protected StackIDFactory() {
        super();
        _curOID = FIRST_OID;
        _tempOID = FIRST_OID;

        Connection con = null;
        try {
            con = L2DatabaseFactory.getInstance().getConnection(con);
            //con.createStatement().execute("drop table if exists tmp_obj_id");

            int[] tmp_obj_ids = extractUsedObjectIDTable();
            if (tmp_obj_ids.length > 0) {
                _curOID = tmp_obj_ids[tmp_obj_ids.length - 1];
            }
            _log.debug("Max Id = " + _curOID);

            int N = tmp_obj_ids.length;
            for (int idx = 0; idx < N; idx++) {
                N = insertUntil(tmp_obj_ids, idx, N, con);
            }

            _curOID++;
            _log.info("IdFactory: Next usable Object ID is: " + _curOID);
            _initialized = true;
        } catch (Exception e1) {
            _log.fatal("ID Factory could not be initialized correctly:" + e1, e1);
        } finally {
            L2DatabaseFactory.close(con);
        }
    }

    private int insertUntil(int[] tmp_obj_ids, int idx, int N, Connection con) throws SQLException {
        int id = tmp_obj_ids[idx];
        if (id == _tempOID) {
            _tempOID++;
            return N;
        }
        // Check these IDs not present in DB
        if (Config.BAD_ID_CHECKING) {
            for (String check : ID_CHECKS) {
                PreparedStatement ps = con.prepareStatement(check);
                ps.setInt(1, _tempOID);
                //ps.setInt(1, _curOID);
                ps.setInt(2, id);
                ResultSet rs = ps.executeQuery();
                if (rs.next()) {
                    int badId = rs.getInt(1);
                    _log.fatal("Bad ID " + badId + " in DB found by: " + check);
                    throw new RuntimeException();
                }
                rs.close();
                ps.close();
            }
        }

        //int hole = id - _curOID;
        int hole = id - _tempOID;
        if (hole > N - idx)
            hole = N - idx;
        for (int i = 1; i <= hole; i++) {
            //_log.debugr("Free ID added " + (_tempOID));
            _freeOIDStack.push(_tempOID);
            _tempOID++;
            //_curOID++;
        }
        if (hole < N - idx)
            _tempOID++;
        return N - hole;
    }

    public static IdFactory getInstance() {
        return _instance;
    }

    @Override
    public synchronized int getNextId() {
        int id;
        if (!_freeOIDStack.empty())
            id = _freeOIDStack.pop();
        else {
            id = _curOID;
            _curOID = _curOID + 1;
        }
        return id;
    }

    /**
     * return a used Object ID back to the pool
     * @param id
     */
    @Override
    public synchronized void releaseId(int id) {
        _freeOIDStack.push(id);
    }

    @Override
    public int size() {
        return FREE_OBJECT_ID_SIZE - _curOID + FIRST_OID + _freeOIDStack.size();
    }

    @Override
    public int getCurrentId() {
        return 0;
    }
}