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<?php
namespace Studip\Cache;
use DateTime;
use Psr\Cache\CacheItemInterface;
/**
* The php memory implementation of the StudipCache interface.
*
* @author Jan-Hendrik Willms <tleilax+studip@gmail.com>
* @license GPL2 or any later version
* @since Stud.IP 5.0
*/
class MemoryCache extends Cache
{
protected array $memory_cache = [];
/**
* Expires just a single key.
*
* @param string $arg the key
*/
public function expire($arg)
{
unset($this->memory_cache[$arg]);
}
/**
* Expire all items from the cache.
*/
public function flush()
{
$this->memory_cache = [];
}
public static function getDisplayName(): string
{
return 'Memory cache';
}
public function getStats(): array
{
return [];
}
public static function getConfig(): array
{
return [];
}
/**
* @inheritDoc
*/
public function getItem(string $key): CacheItemInterface
{
$item = new Item($key);
if (!isset($this->memory_cache[$key])) {
return $item;
}
if ($this->memory_cache[$key]['expires'] < time()) {
$this->expire($key);
return $item;
}
$item->setHit();
$item->set($this->memory_cache[$key]['data']);
if (!empty($this->memory_cache[$key]['expires'])) {
$expiration = new DateTime();
$expiration->setTimestamp($this->memory_cache[$key]['expires']);
$item->expiresAt($expiration);
}
return $item;
}
/**
* @inheritDoc
*/
public function hasItem(string $key): bool
{
return isset($this->memory_cache[$key])
&& $this->memory_cache[$key]['expires'] < time();
}
/**
* @inheritDoc
*/
public function save(CacheItemInterface $item): bool
{
$expiration = $this->getExpiration($item);
$this->memory_cache[$item->getKey()] = [
'expires' => $expiration + time(),
'data' => $item->get(),
];
return true;
}
}
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