/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source 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 of the License, or
* (at your option) any later version.
*
* Resin Open Source 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, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.amber.idgen;
import com.caucho.amber.manager.AmberConnection;
import com.caucho.amber.manager.AmberPersistenceUnit;
import com.caucho.config.ConfigException;
import com.caucho.jdbc.JdbcMetaData;
import com.caucho.util.L10N;
import com.caucho.util.Log;
import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Generator table.
*/
public class SequenceIdGenerator extends IdGenerator {
private static final L10N L = new L10N(SequenceIdGenerator.class);
private static final Logger log = Log.open(SequenceIdGenerator.class);
private AmberPersistenceUnit _manager;
private String _name;
private int _size;
private String _selectSQL;
private boolean _isInit;
/**
* Creates the table generator.
*/
public SequenceIdGenerator(AmberPersistenceUnit manager,
String name,
int size)
throws ConfigException
{
_manager = manager;
_name = name;
_size = size;
}
/**
* Allocates the next group of ids.
*/
public long allocateGroup(AmberConnection aConn)
throws SQLException
{
// XXX: should use non-XA
Connection conn = aConn.getConnection();
PreparedStatement selectStmt = conn.prepareStatement(_selectSQL);
long value = -1;
ResultSet rs = selectStmt.executeQuery();
if (rs.next())
value = rs.getLong(1);
rs.close();
return value;
}
/**
* Initialize the table.
*/
public void init(AmberPersistenceUnit amberPersistenceUnit)
throws SQLException
{
if (_isInit)
return;
_isInit = true;
DataSource ds = amberPersistenceUnit.getDataSource();
Connection conn = ds.getConnection();
try {
JdbcMetaData metaData = amberPersistenceUnit.getMetaData();
_selectSQL = metaData.selectSequenceSQL(_name);
if (amberPersistenceUnit.getCreateDatabaseTables()) {
String sql = metaData.createSequenceSQL(_name, getGroupSize());
try {
Statement stmt = conn.createStatement();
stmt.executeUpdate(sql);
stmt.close();
} catch (Exception e) {
log.log(Level.FINER, e.toString(), e);
}
}
} finally {
conn.close();
}
}
}