235 lines
5.7 KiB
PHP
235 lines
5.7 KiB
PHP
<?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\Component\Cache\Adapter;
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use Psr\Cache\CacheItemInterface;
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use Psr\Cache\CacheItemPoolInterface;
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use Symfony\Component\Cache\CacheItem;
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use Symfony\Component\Cache\Exception\InvalidArgumentException;
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/**
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* Chains several adapters together.
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*
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* Cached items are fetched from the first adapter having them in its data store.
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* They are saved and deleted in all adapters at once.
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*
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* @author Kévin Dunglas <dunglas@gmail.com>
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*/
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class ChainAdapter implements AdapterInterface
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{
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private $adapters = array();
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private $adapterCount;
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private $saveUp;
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/**
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* @param CacheItemPoolInterface[] $adapters The ordered list of adapters used to fetch cached items
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* @param int $maxLifetime The max lifetime of items propagated from lower adapters to upper ones
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*/
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public function __construct(array $adapters, $maxLifetime = 0)
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{
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if (!$adapters) {
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throw new InvalidArgumentException('At least one adapter must be specified.');
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}
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foreach ($adapters as $adapter) {
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if (!$adapter instanceof CacheItemPoolInterface) {
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throw new InvalidArgumentException(sprintf('The class "%s" does not implement the "%s" interface.', get_class($adapter), CacheItemPoolInterface::class));
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}
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if ($adapter instanceof AdapterInterface) {
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$this->adapters[] = $adapter;
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} else {
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$this->adapters[] = new ProxyAdapter($adapter);
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}
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}
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$this->adapterCount = count($this->adapters);
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$this->saveUp = \Closure::bind(
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function ($adapter, $item) use ($maxLifetime) {
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$origDefaultLifetime = $item->defaultLifetime;
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if (0 < $maxLifetime && ($origDefaultLifetime <= 0 || $maxLifetime < $origDefaultLifetime)) {
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$item->defaultLifetime = $maxLifetime;
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}
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$adapter->save($item);
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$item->defaultLifetime = $origDefaultLifetime;
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},
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null,
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CacheItem::class
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);
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}
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/**
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* {@inheritdoc}
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*/
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public function getItem($key)
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{
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$saveUp = $this->saveUp;
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foreach ($this->adapters as $i => $adapter) {
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$item = $adapter->getItem($key);
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if ($item->isHit()) {
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while (0 <= --$i) {
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$saveUp($this->adapters[$i], $item);
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}
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return $item;
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}
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}
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return $item;
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}
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/**
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* {@inheritdoc}
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*/
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public function getItems(array $keys = array())
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{
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return $this->generateItems($this->adapters[0]->getItems($keys), 0);
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}
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private function generateItems($items, $adapterIndex)
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{
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$missing = array();
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$nextAdapterIndex = $adapterIndex + 1;
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$nextAdapter = isset($this->adapters[$nextAdapterIndex]) ? $this->adapters[$nextAdapterIndex] : null;
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foreach ($items as $k => $item) {
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if (!$nextAdapter || $item->isHit()) {
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yield $k => $item;
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} else {
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$missing[] = $k;
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}
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}
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if ($missing) {
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$saveUp = $this->saveUp;
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$adapter = $this->adapters[$adapterIndex];
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$items = $this->generateItems($nextAdapter->getItems($missing), $nextAdapterIndex);
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foreach ($items as $k => $item) {
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if ($item->isHit()) {
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$saveUp($adapter, $item);
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}
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yield $k => $item;
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}
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}
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}
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/**
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* {@inheritdoc}
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*/
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public function hasItem($key)
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{
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foreach ($this->adapters as $adapter) {
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if ($adapter->hasItem($key)) {
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return true;
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}
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}
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return false;
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}
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/**
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* {@inheritdoc}
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*/
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public function clear()
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{
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$cleared = true;
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$i = $this->adapterCount;
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while ($i--) {
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$cleared = $this->adapters[$i]->clear() && $cleared;
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}
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return $cleared;
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}
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/**
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* {@inheritdoc}
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*/
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public function deleteItem($key)
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{
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$deleted = true;
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$i = $this->adapterCount;
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while ($i--) {
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$deleted = $this->adapters[$i]->deleteItem($key) && $deleted;
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}
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return $deleted;
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}
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/**
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* {@inheritdoc}
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*/
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public function deleteItems(array $keys)
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{
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$deleted = true;
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$i = $this->adapterCount;
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while ($i--) {
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$deleted = $this->adapters[$i]->deleteItems($keys) && $deleted;
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}
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return $deleted;
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}
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/**
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* {@inheritdoc}
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*/
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public function save(CacheItemInterface $item)
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{
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$saved = true;
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$i = $this->adapterCount;
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while ($i--) {
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$saved = $this->adapters[$i]->save($item) && $saved;
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}
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return $saved;
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}
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/**
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* {@inheritdoc}
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*/
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public function saveDeferred(CacheItemInterface $item)
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{
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$saved = true;
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$i = $this->adapterCount;
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while ($i--) {
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$saved = $this->adapters[$i]->saveDeferred($item) && $saved;
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}
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return $saved;
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}
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/**
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* {@inheritdoc}
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*/
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public function commit()
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{
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$committed = true;
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$i = $this->adapterCount;
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while ($i--) {
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$committed = $this->adapters[$i]->commit() && $committed;
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}
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return $committed;
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}
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}
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