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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Contracts\Cache;
use Psr\Cache\CacheItemPoolInterface;
use Psr\Cache\InvalidArgumentException;
use Psr\Log\LoggerInterface;
/**
* An implementation of CacheInterface for PSR-6 CacheItemPoolInterface classes.
*
* @author Nicolas Grekas <p@tchwork.com>
*/
trait CacheTrait
{
/**
* {@inheritdoc}
*/
public function get(string $key, callable $callback, float $beta = null, array &$metadata = null)
{
return $this->doGet($this, $key, $callback, $beta, $metadata);
}
/**
* {@inheritdoc}
*/
public function delete(string $key): bool
{
return $this->deleteItem($key);
}
private function doGet(CacheItemPoolInterface $pool, string $key, callable $callback, ?float $beta, array &$metadata = null, LoggerInterface $logger = null)
{
if (0 > $beta = $beta ?? 1.0) {
throw new class(sprintf('Argument "$beta" provided to "%s::get()" must be a positive number, %f given.', \get_class($this), $beta)) extends \InvalidArgumentException implements InvalidArgumentException {
};
}
$item = $pool->getItem($key);
$recompute = !$item->isHit() || INF === $beta;
$metadata = $item instanceof ItemInterface ? $item->getMetadata() : [];
if (!$recompute && $metadata) {
$expiry = $metadata[ItemInterface::METADATA_EXPIRY] ?? false;
$ctime = $metadata[ItemInterface::METADATA_CTIME] ?? false;
if ($recompute = $ctime && $expiry && $expiry <= ($now = microtime(true)) - $ctime / 1000 * $beta * log(random_int(1, PHP_INT_MAX) / PHP_INT_MAX)) {
// force applying defaultLifetime to expiry
$item->expiresAt(null);
$logger && $logger->info('Item "{key}" elected for early recomputation {delta}s before its expiration', [
'key' => $key,
'delta' => sprintf('%.1f', $expiry - $now),
]);
}
}
if ($recompute) {
$save = true;
$item->set($callback($item, $save));
if ($save) {
$pool->save($item);
}
}
return $item->get();
}
}