friendica/src/Core/Cache/APCuCache.php

157 lines
2.9 KiB
PHP

<?php
namespace Friendica\Core\Cache;
use Exception;
use Friendica\Core\Cache;
/**
* APCu Cache Driver.
*
* @author Philipp Holzer <admin@philipp.info>
*/
class APCuCache extends AbstractCacheDriver implements IMemoryCacheDriver
{
use TraitCompareSet;
use TraitCompareDelete;
/**
* @throws Exception
*/
public function __construct(string $hostname)
{
if (!self::isAvailable()) {
throw new Exception('APCu is not available.');
}
parent::__construct($hostname);
}
/**
* (@inheritdoc)
*/
public function getAllKeys($prefix = null)
{
$ns = $this->getCacheKey($prefix);
$ns = preg_quote($ns, '/');
if (class_exists('\APCIterator')) {
$iterator = new \APCIterator('user', '/^' . $ns. '/', APC_ITER_KEY);
} else {
$iterator = new \APCUIterator('/^' . $ns . '/', APC_ITER_KEY);
}
$keys = [];
foreach ($iterator as $item) {
array_push($keys, $item['key']);
}
return $this->getOriginalKeys($keys);
}
/**
* (@inheritdoc)
*/
public function get($key)
{
$return = null;
$cachekey = $this->getCacheKey($key);
$cached = apcu_fetch($cachekey, $success);
if (!$success) {
return null;
}
$value = unserialize($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);
$cached = serialize($value);
if ($ttl > 0) {
return apcu_store(
$cachekey,
$cached,
$ttl
);
} else {
return apcu_store(
$cachekey,
$cached
);
}
}
/**
* (@inheritdoc)
*/
public function delete($key)
{
$cachekey = $this->getCacheKey($key);
return apcu_delete($cachekey);
}
/**
* (@inheritdoc)
*/
public function clear($outdated = true)
{
if ($outdated) {
return true;
} else {
$prefix = $this->getPrefix();
$prefix = preg_quote($prefix, '/');
if (class_exists('\APCIterator')) {
$iterator = new \APCIterator('user', '/^' . $prefix . '/', APC_ITER_KEY);
} else {
$iterator = new \APCUIterator('/^' . $prefix . '/', APC_ITER_KEY);
}
return apcu_delete($iterator);
}
}
/**
* (@inheritdoc)
*/
public function add($key, $value, $ttl = Cache::FIVE_MINUTES)
{
$cachekey = $this->getCacheKey($key);
$cached = serialize($value);
return apcu_add($cachekey, $cached);
}
public static function isAvailable()
{
if (!extension_loaded('apcu')) {
return false;
} elseif (!ini_get('apc.enabled') && !ini_get('apc.enable_cli')) {
return false;
} elseif (
version_compare(phpversion('apc') ?: '0.0.0', '4.0.6') === -1 &&
version_compare(phpversion('apcu') ?: '0.0.0', '5.1.0') === -1
) {
return false;
}
return true;
}
}