friendica/src/Core/Cache/MemcacheCache.php

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<?php
namespace Friendica\Core\Cache;
use Exception;
use Friendica\Core\Config\IConfiguration;
use Memcache;
/**
* Memcache Cache
*
* @author Hypolite Petovan <hypolite@mrpetovan.com>
*/
class MemcacheCache extends Cache implements IMemoryCache
{
use TraitCompareSet;
use TraitCompareDelete;
use TraitMemcacheCommand;
/**
* @var Memcache
*/
private $memcache;
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/**
* @throws Exception
*/
public function __construct(string $hostname, IConfiguration $config)
{
if (!class_exists('Memcache', false)) {
throw new Exception('Memcache class isn\'t available');
}
parent::__construct($hostname);
$this->memcache = new Memcache();
$this->server = $config->get('system', 'memcache_host');;
$this->port = $config->get('system', 'memcache_port');
if (!@$this->memcache->connect($this->server, $this->port)) {
throw new Exception('Expected Memcache server at ' . $this->server . ':' . $this->port . ' isn\'t available');
}
}
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/**
* (@inheritdoc)
*/
public function getAllKeys($prefix = null)
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{
$keys = $this->getOriginalKeys($this->getMemcacheKeys());
return $this->filterArrayKeysByPrefix($keys, $prefix);
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}
/**
* (@inheritdoc)
*/
public function get($key)
{
$return = null;
$cachekey = $this->getCacheKey($key);
// We fetch with the hostname as key to avoid problems with other applications
$cached = $this->memcache->get($cachekey);
// @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)
{
$cachekey = $this->getCacheKey($key);
// We store with the hostname as key to avoid problems with other applications
if ($ttl > 0) {
return $this->memcache->set(
$cachekey,
serialize($value),
MEMCACHE_COMPRESSED,
time() + $ttl
);
} else {
return $this->memcache->set(
$cachekey,
serialize($value),
MEMCACHE_COMPRESSED
);
}
}
/**
* (@inheritdoc)
*/
public function delete($key)
{
$cachekey = $this->getCacheKey($key);
return $this->memcache->delete($cachekey);
}
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/**
* (@inheritdoc)
*/
public function clear($outdated = true)
{
if ($outdated) {
return true;
} else {
return $this->memcache->flush();
}
}
/**
* (@inheritdoc)
*/
public function add($key, $value, $ttl = Cache::FIVE_MINUTES)
{
$cachekey = $this->getCacheKey($key);
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return $this->memcache->add($cachekey, serialize($value), MEMCACHE_COMPRESSED, $ttl);
}
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/**
* {@inheritDoc}
*/
public function getName()
{
return self::TYPE_MEMCACHE;
}
}