friendica/src/Core/Cache/MemcachedCacheDriver.php
2018-07-16 19:38:16 -04:00

118 lines
2.5 KiB
PHP

<?php
namespace Friendica\Core\Cache;
use Friendica\Core\Cache;
use Exception;
use Memcached;
/**
* Memcached Cache Driver
*
* @author Hypolite Petovan <mrpetovan@gmail.com>
*/
class MemcachedCacheDriver extends AbstractCacheDriver implements IMemoryCacheDriver
{
use TraitCompareSet;
use TraitCompareDelete;
/**
* @var \Memcached
*/
private $memcached;
/**
* Due to limitations of the INI format, the expected configuration for Memcached servers is the following:
* array {
* 0 => "hostname, port(, weight)",
* 1 => ...
* }
*
* @param array $memcached_hosts
* @throws \Exception
*/
public function __construct(array $memcached_hosts)
{
if (!class_exists('Memcached', false)) {
throw new Exception('Memcached class isn\'t available');
}
$this->memcached = new Memcached();
array_walk($memcached_hosts, function (&$value) {
$value = array_map('trim', explode(',', $value));
});
$this->memcached->addServers($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,
$ttl
);
} else {
return $this->memcached->set(
$cachekey,
$value
);
}
}
public function delete($key)
{
$cachekey = $this->getCacheKey($key);
return $this->memcached->delete($cachekey);
}
public function clear($outdated = true)
{
if ($outdated) {
return true;
} else {
return $this->memcached->flush();
}
}
/**
* @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);
}
}