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/*
 * This file is part of the symfony package.
 * (c) 2004-2006 Fabien Potencier <fabien.potencier@symfony-project.com>
 * (c) 2004-2006 Sean Kerr <sean@code-box.org>
 * 
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

/**
 * Base class for all sfStorage that uses a sfDatabase object as a storage.
 *
 * @package    symfony
 * @subpackage storage
 * @author     Fabien Potencier <fabien.potencier@symfony-project.com>
 * @author     Sean Kerr <sean@code-box.org>
 * @version    SVN: $Id: sfDatabaseSessionStorage.class.php 22037 2009-09-15 11:00:20Z fabien $
 */
abstract class sfDatabaseSessionStorage extends sfSessionStorage
{
  protected
    $db = null,
    $con = null;

  /**
   * Available options:
   *
   *   * db_table:    The database table in which session data will be stored
   *   * database:    The sfDatabase object to use
   *   * db_id_col:   The database column in which the session id will be stored (sess_id by default)
   *   * db_data_col: The database column in which the session data will be stored (sess_data by default)
   *   * db_time_col: The database column in which the session timestamp will be stored (sess_time by default)
   *
   * @param  array $options  An associative array of options
   *
   * @see sfSessionStorage
   */
  public function initialize($options = array())
  {
    $options = array_merge(array(
      'db_id_col'   => 'sess_id',
      'db_data_col' => 'sess_data',
      'db_time_col' => 'sess_time',
    ), $options);

    // disable auto_start
    $options['auto_start'] = false;

    // initialize the parent
    parent::initialize($options);

    if (!isset($this->options['db_table']))
    {
      throw new sfInitializationException('You must provide a "db_table" option to sfDatabaseSessionStorage.');
    }

    if (!isset($this->options['database']))
    {
      throw new sfInitializationException('You must provide a "database" option to sfDatabaseSessionStorage.');
    }

    // use this object as the session handler
    session_set_save_handler(array($this, 'sessionOpen'),
                             array($this, 'sessionClose'),
                             array($this, 'sessionRead'),
                             array($this, 'sessionWrite'),
                             array($this, 'sessionDestroy'),
                             array($this, 'sessionGC'));

    // start our session
    session_start();
  }

  /**
   * Closes a session.
   *
   * @return boolean true, if the session was closed, otherwise false
   */
  public function sessionClose()
  {
    // do nothing
    return true;
  }

  /**
   * Opens a session.
   *
   * @param  string $path  (ignored)
   * @param  string $name  (ignored)
   *
   * @return boolean true, if the session was opened, otherwise an exception is thrown
   *
   * @throws <b>DatabaseException</b> If a connection with the database does not exist or cannot be created
   */
  public function sessionOpen($path = null, $name = null)
  {
    // what database are we using?
    $database = $this->options['database'];

    // get the database and connection
    $databaseClass = get_class($database);
    if($databaseClass == 'sfPropelDatabase')
    {
      $this->db = Propel::getConnection($database->getParameter('name'));
    }
    elseif($databaseClass == 'sfDoctrineDatabase')
    {
      $this->db = $database->getConnection();
    }
    else
    {
      $this->db = $database->getResource();
    }
    
    $this->con = $database->getConnection();

    if (null === $this->db && null === $this->con)
    {
      throw new sfDatabaseException('Database connection does not exist. Unable to open session.');
    }

    return true;
  }

  /**
   * Destroys a session.
   *
   * @param  string $id  A session ID
   *
   * @return bool true, if the session was destroyed, otherwise an exception is thrown
   *
   * @throws <b>DatabaseException</b> If the session cannot be destroyed
   */
  abstract public function sessionDestroy($id);

  /**
   * Cleans up old sessions.
   *
   * @param  int $lifetime  The lifetime of a session
   *
   * @return bool true, if old sessions have been cleaned, otherwise an exception is thrown
   *
   * @throws <b>DatabaseException</b> If any old sessions cannot be cleaned
   */
  abstract public function sessionGC($lifetime);

  /**
   * Reads a session.
   *
   * @param  string $id  A session ID
   *
   * @return bool true, if the session was read, otherwise an exception is thrown
   *
   * @throws <b>DatabaseException</b> If the session cannot be read
   */
  abstract public function sessionRead($id);

  /**
   * Writes session data.
   *
   * @param  string $id    A session ID
   * @param  string $data  A serialized chunk of session data
   *
   * @return bool true, if the session was written, otherwise an exception is thrown
   *
   * @throws <b>DatabaseException</b> If the session data cannot be written
   */
  abstract public function sessionWrite($id, $data);

  /**
   * Regenerates id that represents this storage.
   *
   * @param  boolean $destroy Destroy session when regenerating?
   *
   * @return boolean True if session regenerated, false if error
   *
   */
  public function regenerate($destroy = false)
  {
    if (self::$sessionIdRegenerated)
    {
      return;
    }

    $currentId = session_id();

    parent::regenerate($destroy);

    $newId = session_id();
    $this->sessionRead($newId);

    return $this->sessionWrite($newId, $this->sessionRead($currentId));
  }

  /**
   * Executes the shutdown procedure.
   *
   */
  public function shutdown()
  {
    parent::shutdown();
  }
}