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Filename : ChainAdapter.php
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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\Component\Cache\Adapter;

use Psr\Cache\CacheItemInterface;
use Psr\Cache\CacheItemPoolInterface;
use Symfony\Component\Cache\CacheItem;
use Symfony\Component\Cache\Exception\InvalidArgumentException;
use Symfony\Component\Cache\PruneableInterface;
use Symfony\Component\Cache\ResettableInterface;
use Symfony\Component\Cache\Traits\ContractsTrait;
use Symfony\Contracts\Cache\CacheInterface;
use Symfony\Contracts\Service\ResetInterface;

/**
 * Chains several adapters together.
 *
 * Cached items are fetched from the first adapter having them in its data store.
 * They are saved and deleted in all adapters at once.
 *
 * @author Kévin Dunglas <dunglas@gmail.com>
 */
class ChainAdapter implements AdapterInterface, CacheInterface, PruneableInterface, ResettableInterface
{
    use ContractsTrait;

    private array $adapters = [];
    private int $adapterCount;

    private static \Closure $syncItem;

    /**
     * @param CacheItemPoolInterface[] $adapters        The ordered list of adapters used to fetch cached items
     * @param int                      $defaultLifetime The default lifetime of items propagated from lower adapters to upper ones
     */
    public function __construct(
        array $adapters,
        private int $defaultLifetime = 0,
    ) {
        if (!$adapters) {
            throw new InvalidArgumentException('At least one adapter must be specified.');
        }

        foreach ($adapters as $adapter) {
            if (!$adapter instanceof CacheItemPoolInterface) {
                throw new InvalidArgumentException(\sprintf('The class "%s" does not implement the "%s" interface.', get_debug_type($adapter), CacheItemPoolInterface::class));
            }
            if ('cli' === \PHP_SAPI && $adapter instanceof ApcuAdapter && !filter_var(\ini_get('apc.enable_cli'), \FILTER_VALIDATE_BOOL)) {
                continue; // skip putting APCu in the chain when the backend is disabled
            }

            if ($adapter instanceof AdapterInterface) {
                $this->adapters[] = $adapter;
            } else {
                $this->adapters[] = new ProxyAdapter($adapter);
            }
        }
        $this->adapterCount = \count($this->adapters);

        self::$syncItem ??= \Closure::bind(
            static function ($sourceItem, $item, $defaultLifetime, $sourceMetadata = null) {
                $sourceItem->isTaggable = false;
                $sourceMetadata ??= $sourceItem->metadata;

                $item->value = $sourceItem->value;
                $item->isHit = $sourceItem->isHit;
                $item->metadata = $item->newMetadata = $sourceItem->metadata = $sourceMetadata;

                if (isset($item->metadata[CacheItem::METADATA_EXPIRY])) {
                    $item->expiresAt(\DateTimeImmutable::createFromFormat('U.u', \sprintf('%.6F', $item->metadata[CacheItem::METADATA_EXPIRY])));
                } elseif (0 < $defaultLifetime) {
                    $item->expiresAfter($defaultLifetime);
                }

                return $item;
            },
            null,
            CacheItem::class
        );
    }

    public function get(string $key, callable $callback, ?float $beta = null, ?array &$metadata = null): mixed
    {
        $doSave = true;
        $callback = static function (CacheItem $item, bool &$save) use ($callback, &$doSave) {
            $value = $callback($item, $save);
            $doSave = $save;

            return $value;
        };

        $wrap = function (?CacheItem $item = null, bool &$save = true) use ($key, $callback, $beta, &$wrap, &$doSave, &$metadata) {
            static $lastItem;
            static $i = 0;
            $adapter = $this->adapters[$i];
            if (isset($this->adapters[++$i])) {
                $callback = $wrap;
                $beta = \INF === $beta ? \INF : 0;
            }
            if ($adapter instanceof CacheInterface) {
                $value = $adapter->get($key, $callback, $beta, $metadata);
            } else {
                $value = $this->doGet($adapter, $key, $callback, $beta, $metadata);
            }
            if (null !== $item) {
                (self::$syncItem)($lastItem ??= $item, $item, $this->defaultLifetime, $metadata);
            }
            $save = $doSave;

            return $value;
        };

        return $wrap();
    }

    public function getItem(mixed $key): CacheItem
    {
        $syncItem = self::$syncItem;
        $misses = [];

        foreach ($this->adapters as $i => $adapter) {
            $item = $adapter->getItem($key);

            if ($item->isHit()) {
                while (0 <= --$i) {
                    $this->adapters[$i]->save($syncItem($item, $misses[$i], $this->defaultLifetime));
                }

                return $item;
            }

            $misses[$i] = $item;
        }

        return $item;
    }

    public function getItems(array $keys = []): iterable
    {
        return $this->generateItems($this->adapters[0]->getItems($keys), 0);
    }

    private function generateItems(iterable $items, int $adapterIndex): \Generator
    {
        $missing = [];
        $misses = [];
        $nextAdapterIndex = $adapterIndex + 1;
        $nextAdapter = $this->adapters[$nextAdapterIndex] ?? null;

        foreach ($items as $k => $item) {
            if (!$nextAdapter || $item->isHit()) {
                yield $k => $item;
            } else {
                $missing[] = $k;
                $misses[$k] = $item;
            }
        }

        if ($missing) {
            $syncItem = self::$syncItem;
            $adapter = $this->adapters[$adapterIndex];
            $items = $this->generateItems($nextAdapter->getItems($missing), $nextAdapterIndex);

            foreach ($items as $k => $item) {
                if ($item->isHit()) {
                    $adapter->save($syncItem($item, $misses[$k], $this->defaultLifetime));
                }

                yield $k => $item;
            }
        }
    }

    public function hasItem(mixed $key): bool
    {
        foreach ($this->adapters as $adapter) {
            if ($adapter->hasItem($key)) {
                return true;
            }
        }

        return false;
    }

    public function clear(string $prefix = ''): bool
    {
        $cleared = true;
        $i = $this->adapterCount;

        while ($i--) {
            if ($this->adapters[$i] instanceof AdapterInterface) {
                $cleared = $this->adapters[$i]->clear($prefix) && $cleared;
            } else {
                $cleared = $this->adapters[$i]->clear() && $cleared;
            }
        }

        return $cleared;
    }

    public function deleteItem(mixed $key): bool
    {
        $deleted = true;
        $i = $this->adapterCount;

        while ($i--) {
            $deleted = $this->adapters[$i]->deleteItem($key) && $deleted;
        }

        return $deleted;
    }

    public function deleteItems(array $keys): bool
    {
        $deleted = true;
        $i = $this->adapterCount;

        while ($i--) {
            $deleted = $this->adapters[$i]->deleteItems($keys) && $deleted;
        }

        return $deleted;
    }

    public function save(CacheItemInterface $item): bool
    {
        $saved = true;
        $i = $this->adapterCount;

        while ($i--) {
            $saved = $this->adapters[$i]->save($item) && $saved;
        }

        return $saved;
    }

    public function saveDeferred(CacheItemInterface $item): bool
    {
        $saved = true;
        $i = $this->adapterCount;

        while ($i--) {
            $saved = $this->adapters[$i]->saveDeferred($item) && $saved;
        }

        return $saved;
    }

    public function commit(): bool
    {
        $committed = true;
        $i = $this->adapterCount;

        while ($i--) {
            $committed = $this->adapters[$i]->commit() && $committed;
        }

        return $committed;
    }

    public function prune(): bool
    {
        $pruned = true;

        foreach ($this->adapters as $adapter) {
            if ($adapter instanceof PruneableInterface) {
                $pruned = $adapter->prune() && $pruned;
            }
        }

        return $pruned;
    }

    public function reset(): void
    {
        foreach ($this->adapters as $adapter) {
            if ($adapter instanceof ResetInterface) {
                $adapter->reset();
            }
        }
    }
}