friendica/src/Core/Cache/MemcachedCacheDriver.php
2018-07-05 21:54:20 +02:00

97 lines
2.0 KiB
PHP

<?php
namespace Friendica\Core\Cache;
use Friendica\Core\Cache;
/**
* Memcached Cache Driver
*
* @author Hypolite Petovan <mrpetovan@gmail.com>
*/
class MemcachedCacheDriver extends AbstractCacheDriver implements IMemoryCacheDriver
{
use TraitCompareSet;
use TraitCompareDelete;
/**
* @var \Memcached
*/
private $memcached;
public function __construct(array $memcached_hosts)
{
if (!class_exists('Memcached', false)) {
throw new \Exception('Memcached class isn\'t available');
}
$this->memcached = new \Memcached();
$this->memcached->addServers($memcached_hosts);
if (count($this->memcached->getServerList()) == 0) {
throw new \Exception('Expected Memcached servers aren\'t available, config:' . var_export($memcached_hosts, true));
}
}
public function get($key)
{
$return = null;
$cachekey = $this->getCacheKey($key);
// We fetch with the hostname as key to avoid problems with other applications
$value = $this->memcached->get($cachekey);
if ($this->memcached->getResultCode() === \Memcached::RES_SUCCESS) {
$return = $value;
}
return $return;
}
public function set($key, $value, $ttl = Cache::FIVE_MINUTES)
{
$cachekey = $this->getCacheKey($key);
// We store with the hostname as key to avoid problems with other applications
if ($ttl > 0) {
return $this->memcached->set(
$cachekey,
$value,
time() + $ttl
);
} else {
return $this->memcached->set(
$cachekey,
$value
);
}
}
public function delete($key)
{
$cachekey = $this->getCacheKey($key);
return $this->memcached->delete($cachekey);
}
public function clear()
{
return true;
}
/**
* @brief Sets a value if it's not already stored
*
* @param string $key The cache key
* @param mixed $value The old value we know from the cache
* @param int $ttl The cache lifespan, must be one of the Cache constants
* @return bool
*/
public function add($key, $value, $ttl = Cache::FIVE_MINUTES)
{
$cachekey = $this->getCacheKey($key);
return $this->memcached->add($cachekey, $value, $ttl);
}
}