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<?php
/* Copyright (c) 2012, Geert Bergman (geert@scrivo.nl)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of "Scrivo" nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* $Id: NoCache.php 629 2013-05-20 23:02:09Z geert $
*/
/**
* Implementation of the \Scrivo\NoCache class.
*/
namespace Scrivo\Cache;
/**
* No-cache implementation of the Cache interface.
*
* This is an implementation of the Cache interface that you can use when
* you don't want any caching to take place. No data will be stored and
* null is returned on all fetches.
*/
class NoCache implements \Scrivo\Cache {
/**
* Create an APC cache wrapper.
*/
public function __construct() {
}
/**
* Pretend to store a variable in the cache.
*
* @param \Scrivo\String $key A cache unique name for the key.
* @param mixed $val The (serializable) variabele to strore.
* @param int $ttl Time to live in seconds.
*
* @return int DATA_STORED although no data will be stored.
*
* @throws \Scrivo\SystemException When trying to store a NULL value.
*/
public function store(\Scrivo\String $key, $val, $ttl=3600) {
if ($val === null) {
throw new \Scrivo\SystemException(
"Can't store null values in the cache");
}
return self::DATA_STORED;
}
/**
* Pretend to overwrite a variable in the cache.
*
* @param \Scrivo\String $key A cache unique name for the key.
* @param mixed $val The (serializable) variabele to strore.
* @param int $ttl Time to live in seconds.
*
* @return int DATA_STORED although no data will be stored.
*
* @throws \Scrivo\SystemException When trying to store a NULL value.
*/
public function overwrite(\Scrivo\String $key, $val, $ttl=3600) {
if ($val === null) {
throw new \Scrivo\SystemException(
"Can't store null values in the cache");
}
return self::DATA_STORED;
}
/**
* Pretend to delete/remove a cache entry.
*
* @param \Scrivo\String $key A cache unique name for the key.
*/
public function delete(\Scrivo\String $key) {
}
/**
* Perform a failed fetch from the cache.
*
* @param \Scrivo\String $key The key for which to retrieve the value.
*
* @return mixed The value of the stored variable or NULL if the key
* does not exists or is expired.
*/
public function fetch(\Scrivo\String $key) {
null;
}
/**
* List all (=none) entries in the cache.
*
* @return object[] An empty array.
*/
public function entryList() {
return array();
}
}