libs/Yii/web/CCacheHttpSession.php

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<?php
/**
 * CCacheHttpSession class
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @link http://www.yiiframework.com/
 * @copyright Copyright &copy; 2008-2011 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */


/**
 * CCacheHttpSession implements a session component using cache as storage medium.
 *
 * The cache being used can be any cache application component implementing {@link ICache} interface.
 * The ID of the cache application component is specified via {@link cacheID}, which defaults to 'cache'.
 *
 * Beware, by definition cache storage are volatile, which means the data stored on them
 * may be swapped out and get lost. Therefore, you must make sure the cache used by this component
 * is NOT volatile. If you want to use {@link CDbCache} as storage medium, use {@link CDbHttpSession}
 * is a better choice.
 *
 * @property boolean $useCustomStorage Whether to use custom storage.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @version $Id$
 * @package system.web
 * @since 1.0
 */
class CCacheHttpSession extends CHttpSession
{
	/**
	 * Prefix to the keys for storing cached data
	 */
	const CACHE_KEY_PREFIX='Yii.CCacheHttpSession.';
	/**
	 * @var string the ID of the cache application component. Defaults to 'cache' (the primary cache application component.)
	 */
	public $cacheID='cache';

	/**
	 * @var ICache the cache component
	 */
	private $_cache;

	/**
	 * Initializes the application component.
	 * This method overrides the parent implementation by checking if cache is available.
	 */
	public function init()
	{
		$this->_cache=Yii::app()->getComponent($this->cacheID);
		if(!($this->_cache instanceof ICache))
			throw new CException(Yii::t('yii','CCacheHttpSession.cacheID is invalid. Please make sure "{id}" refers to a valid cache application component.',
				array('{id}'=>$this->cacheID)));
		parent::init();
	}

	/**
	 * Returns a value indicating whether to use custom session storage.