1: <?php
  2: /**
  3:  * Cache Session save handler.  Allows saving session information into Cache.
  4:  *
  5:  * PHP 5
  6:  *
  7:  * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
  8:  * Copyright 2005-2011, Cake Software Foundation, Inc. (http://cakefoundation.org)
  9:  *
 10:  * Licensed under The MIT License
 11:  * Redistributions of files must retain the above copyright notice.
 12:  *
 13:  * @copyright     Copyright 2005-2011, Cake Software Foundation, Inc. (http://cakefoundation.org)
 14:  * @link          http://cakephp.org CakePHP(tm) Project
 15:  * @package       Cake.Model.Datasource.Session
 16:  * @since         CakePHP(tm) v 2.0
 17:  * @license       MIT License (http://www.opensource.org/licenses/mit-license.php)
 18:  */
 19: 
 20: App::uses('Cache', 'Cache');
 21: 
 22: /**
 23:  * CacheSession provides method for saving sessions into a Cache engine. Used with CakeSession
 24:  *
 25:  * @package       Cake.Model.Datasource.Session
 26:  * @see CakeSession for configuration information.
 27:  */
 28: class CacheSession implements CakeSessionHandlerInterface {
 29: /**
 30:  * Method called on open of a database session.
 31:  *
 32:  * @return boolean Success
 33:  */
 34:     public function open() {
 35:         return true;
 36:     }
 37: 
 38: /**
 39:  * Method called on close of a database session.
 40:  *
 41:  * @return boolean Success
 42:  */
 43:     public function close() {
 44:         $probability = mt_rand(1, 150);
 45:         if ($probability <= 3) {
 46:             Cache::gc();
 47:         }
 48:         return true;
 49:     }
 50: 
 51: /**
 52:  * Method used to read from a database session.
 53:  *
 54:  * @param mixed $id The key of the value to read
 55:  * @return mixed The value of the key or false if it does not exist
 56:  */
 57:     public function read($id) {
 58:         return Cache::read($id, Configure::read('Session.handler.config'));
 59:     }
 60: 
 61: /**
 62:  * Helper function called on write for database sessions.
 63:  *
 64:  * @param integer $id ID that uniquely identifies session in database
 65:  * @param mixed $data The value of the data to be saved.
 66:  * @return boolean True for successful write, false otherwise.
 67:  */
 68:     public function write($id, $data) {
 69:         return Cache::write($id, $data, Configure::read('Session.handler.config'));
 70:     }
 71: 
 72: /**
 73:  * Method called on the destruction of a database session.
 74:  *
 75:  * @param integer $id ID that uniquely identifies session in database
 76:  * @return boolean True for successful delete, false otherwise.
 77:  */
 78:     public function destroy($id) {
 79:         return Cache::delete($id, Configure::read('Session.handler.config'));
 80:     }
 81: 
 82: /**
 83:  * Helper function called on gc for database sessions.
 84:  *
 85:  * @param integer $expires Timestamp (defaults to current time)
 86:  * @return boolean Success
 87:  */
 88:     public function gc($expires = null) {
 89:         return Cache::gc();
 90:     }
 91: 
 92: /**
 93:  * Closes the session before the objects handling it become unavailable
 94:  *
 95:  * @return void
 96:  */
 97:     public function __destruct() {
 98:         session_write_close();
 99:     }
100: }