<?php
/**
* This file is part of the PHP Video Toolkit v2 package.
*
* @author Oliver Lillie (aka buggedcom) <publicmail@buggedcom.co.uk>
* @license Dual licensed under MIT and GPLv2
* @copyright Copyright (c) 2008-2014 Oliver Lillie <http://www.buggedcom.co.uk>
* @package PHPVideoToolkit V2
* @version 2.1.7-beta
* @uses ffmpeg http://ffmpeg.sourceforge.net/
*/
namespace PHPVideoToolkit;
/**
* PHPVideoToolkit's caching driver for a blackhole cache driver. Meaning that the cache functionality can be used but nothing ever stored.
*
* @author Oliver Lillie
*/
class Cache_Null extends CacheAbstract
{
/**
* Determines if this caching driver is available on the current system.
* Returns true.
*
* @access public
* @author Oliver Lillie
* @return boolean Returns true.
*/
public function isAvailable()
{
return true;
}
/**
* Returns null.
*
* @access protected
* @author Oliver Lillie
* @param string $key The cache key string.
* @return mixed Returns null if the key does not exist, otherwise returns a mixed value depending on what has been stored.
*/
protected function _get($key)
{
return null;
}
/**
* Returns true.
*
* @access protected
* @author Oliver Lillie
* @param string $key The cache key string.
* @return boolean Returns true.
*/
protected function _isMiss($key)
{
return true;
}
/**
* Returns null.
*
* @access protected
* @author Oliver Lillie
* @param string $key The cache key string.
* @param mixed $value The data to be stored by the cache driver.
* @param mixed $expiration Integer timestamp if the data is too expire, otherwise null as the cache defaults to expire in 1 hour.
* @return boolean Returns null.
*/
protected function _set($key, $value, $expiration=null)
{
return null;
}
}
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