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<?php
/*
* $Id: Memcache.php 10831 2013-05-29 19:32:17Z btowles $
*
* 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
* OWNER 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.
*
* This software consists of voluntary contributions made by many individuals
* and is licensed under the LGPL. For more information, see
* <http://www.doctrine-project.org>.
*/
/**
* Memcache cache driver
*
* @package Doctrine
* @subpackage Cache
* @license http://www.opensource.org/licenses/lgpl-license.php LGPL
* @link www.doctrine-project.org
* @since 1.0
* @version $Revision: 7490 $
* @author Konsta Vesterinen <kvesteri@cc.hut.fi>
* @author Jonathan H. Wage <jonwage@gmail.com>
*/
class Doctrine_Cache_Memcache extends Doctrine_Cache_Driver
{
/**
* @var Memcache $_memcache memcache object
*/
protected $_memcache = null;
/**
* constructor
*
* @param array $options associative array of cache driver options
*/
public function __construct($options = array())
{
if ( ! extension_loaded('memcache')) {
throw new Doctrine_Cache_Exception('In order to use Memcache driver, the memcache extension must be loaded.');
}
parent::__construct($options);
if (isset($options['servers'])) {
$value= $options['servers'];
if (isset($value['host'])) {
// in this case, $value seems to be a simple associative array (one server only)
$value = array(0 => $value); // let's transform it into a classical array of associative arrays
}
$this->setOption('servers', $value);
}
$this->_memcache = new Memcache;
foreach ($this->_options['servers'] as $server) {
if ( ! array_key_exists('persistent', $server)) {
$server['persistent'] = true;
}
if ( ! array_key_exists('port', $server)) {
$server['port'] = 11211;
}
$this->_memcache->addServer($server['host'], $server['port'], $server['persistent']);
}
}
/**
* Test if a cache record exists for the passed id
*
* @param string $id cache id
* @return mixed Returns either the cached data or false
*/
protected function _doFetch($id, $testCacheValidity = true)
{
return $this->_memcache->get($id);
}
/**
* Test if a cache is available or not (for the given id)
*
* @param string $id cache id
* @return mixed false (a cache is not available) or "last modified" timestamp (int) of the available cache record
*/
protected function _doContains($id)
{
return (bool) $this->_memcache->get($id);
}
/**
* Save a cache record directly. This method is implemented by the cache
* drivers and used in Doctrine_Cache_Driver::save()
*
* @param string $id cache id
* @param string $data data to cache
* @param int $lifeTime if != false, set a specific lifetime for this cache record (null => infinite lifeTime)
* @return boolean true if no problem
*/
protected function _doSave($id, $data, $lifeTime = false)
{
if ($this->_options['compression']) {
$flag = MEMCACHE_COMPRESSED;
} else {
$flag = 0;
}
return $this->_memcache->set($id, $data, $flag, $lifeTime);
}
/**
* Remove a cache record directly. This method is implemented by the cache
* drivers and used in Doctrine_Cache_Driver::delete()
*
* @param string $id cache id
* @return boolean true if no problem
*/
protected function _doDelete($id)
{
return $this->_memcache->delete($id);
}
/**
* Fetch an array of all keys stored in cache
*
* @return array Returns the array of cache keys
*/
protected function _getCacheKeys()
{
$keys = array();
$allSlabs = $this->_memcache->getExtendedStats('slabs');
foreach ($allSlabs as $server => $slabs) {
foreach (array_keys($slabs) as $slabId) {
$dump = $this->_memcache->getExtendedStats('cachedump', (int) $slabId);
foreach ($dump as $entries) {
if ($entries) {
$keys = array_merge($keys, array_keys($entries));
}
}
}
}
return $keys;
}
}