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