friendica/src/Core/Cache/MemcacheCacheDriver.php

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<?php
namespace Friendica\Core\Cache;
use Friendica\BaseObject;
use Friendica\Core\Cache;
/**
* Memcache Cache Driver
*
* @author Hypolite Petovan <mrpetovan@gmail.com>
*/
class MemcacheCacheDriver extends BaseObject implements IMemoryCacheDriver
{
use TraitCompareSet;
use TraitCompareDelete;
/**
* @var \Memcache
*/
private $memcache;
public function __construct($memcache_host, $memcache_port)
{
if (!class_exists('Memcache', false)) {
throw new \Exception('Memcache class isn\'t available');
}
$this->memcache = new \Memcache();
if (!$this->memcache->connect($memcache_host, $memcache_port)) {
throw new \Exception('Expected Memcache server at ' . $memcache_host . ':' . $memcache_port . ' isn\'t available');
}
}
/**
* (@inheritdoc)
*/
public function get($key)
{
$return = null;
// We fetch with the hostname as key to avoid problems with other applications
$cached = $this->memcache->get(self::getApp()->get_hostname() . ':' . $key);
// @see http://php.net/manual/en/memcache.get.php#84275
if (is_bool($cached) || is_double($cached) || is_long($cached)) {
return $return;
}
$value = @unserialize($cached);
// Only return a value if the serialized value is valid.
// We also check if the db entry is a serialized
// boolean 'false' value (which we want to return).
if ($cached === serialize(false) || $value !== false) {
$return = $value;
}
return $return;
}
/**
* (@inheritdoc)
*/
public function set($key, $value, $ttl = Cache::FIVE_MINUTES)
{
// We store with the hostname as key to avoid problems with other applications
if ($ttl > 0) {
return $this->memcache->set(
self::getApp()->get_hostname() . ":" . $key,
serialize($value),
MEMCACHE_COMPRESSED,
time() + $ttl
);
} else {
return $this->memcache->set(
self::getApp()->get_hostname() . ":" . $key,
serialize($value),
MEMCACHE_COMPRESSED
);
}
}
/**
* (@inheritdoc)
*/
public function delete($key)
{
return $this->memcache->delete($key);
}
public function clear()
{
return $this->memcache->flush();
}
/**
* (@inheritdoc)
*/
public function add($key, $value, $ttl = Cache::FIVE_MINUTES)
{
return $this->memcache->add(self::getApp()->get_hostname() . ":" . $key, $value, $ttl);
}
}