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 2005-2012, 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 2005-2012, 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: App::uses('CakeSessionHandlerInterface', 'Model/Datasource/Session');
 22: 
 23: /**
 24:  * CacheSession provides method for saving sessions into a Cache engine. Used with CakeSession
 25:  *
 26:  * @package       Cake.Model.Datasource.Session
 27:  * @see CakeSession for configuration information.
 28:  */
 29: class CacheSession implements CakeSessionHandlerInterface {
 30: 
 31: /**
 32:  * Method called on open of a database session.
 33:  *
 34:  * @return boolean Success
 35:  */
 36:     public function open() {
 37:         return true;
 38:     }
 39: 
 40: /**
 41:  * Method called on close of a database session.
 42:  *
 43:  * @return boolean Success
 44:  */
 45:     public function close() {
 46:         $probability = mt_rand(1, 150);
 47:         if ($probability <= 3) {
 48:             Cache::gc();
 49:         }
 50:         return true;
 51:     }
 52: 
 53: /**
 54:  * Method used to read from a database session.
 55:  *
 56:  * @param mixed $id The key of the value to read
 57:  * @return mixed The value of the key or false if it does not exist
 58:  */
 59:     public function read($id) {
 60:         return Cache::read($id, Configure::read('Session.handler.config'));
 61:     }
 62: 
 63: /**
 64:  * Helper function called on write for database sessions.
 65:  *
 66:  * @param integer $id ID that uniquely identifies session in database
 67:  * @param mixed $data The value of the data to be saved.
 68:  * @return boolean True for successful write, false otherwise.
 69:  */
 70:     public function write($id, $data) {
 71:         return Cache::write($id, $data, Configure::read('Session.handler.config'));
 72:     }
 73: 
 74: /**
 75:  * Method called on the destruction of a database session.
 76:  *
 77:  * @param integer $id ID that uniquely identifies session in database
 78:  * @return boolean True for successful delete, false otherwise.
 79:  */
 80:     public function destroy($id) {
 81:         return Cache::delete($id, Configure::read('Session.handler.config'));
 82:     }
 83: 
 84: /**
 85:  * Helper function called on gc for database sessions.
 86:  *
 87:  * @param integer $expires Timestamp (defaults to current time)
 88:  * @return boolean Success
 89:  */
 90:     public function gc($expires = null) {
 91:         return Cache::gc();
 92:     }
 93: 
 94: /**
 95:  * Closes the session before the objects handling it become unavailable
 96:  *
 97:  * @return void
 98:  */
 99:     public function __destruct() {
100:         session_write_close();
101:     }
102: 
103: }
104: