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252 lines
6.3 KiB
PHP
252 lines
6.3 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\Simple;
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use Psr\SimpleCache\CacheInterface;
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use Symfony\Component\Cache\Exception\InvalidArgumentException;
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use Symfony\Component\Cache\PruneableInterface;
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use Symfony\Component\Cache\ResettableInterface;
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/**
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* Chains several caches together.
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*
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* Cached items are fetched from the first cache having them in its data store.
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* They are saved and deleted in all caches at once.
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*
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* @author Nicolas Grekas <p@tchwork.com>
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*/
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class ChainCache implements CacheInterface, PruneableInterface, ResettableInterface
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{
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private $miss;
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private $caches = array();
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private $defaultLifetime;
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private $cacheCount;
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/**
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* @param CacheInterface[] $caches The ordered list of caches used to fetch cached items
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* @param int $defaultLifetime The lifetime of items propagated from lower caches to upper ones
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*/
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public function __construct(array $caches, $defaultLifetime = 0)
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{
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if (!$caches) {
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throw new InvalidArgumentException('At least one cache must be specified.');
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}
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foreach ($caches as $cache) {
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if (!$cache instanceof CacheInterface) {
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throw new InvalidArgumentException(sprintf('The class "%s" does not implement the "%s" interface.', get_class($cache), CacheInterface::class));
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}
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}
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$this->miss = new \stdClass();
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$this->caches = array_values($caches);
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$this->cacheCount = count($this->caches);
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$this->defaultLifetime = 0 < $defaultLifetime ? (int) $defaultLifetime : null;
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}
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/**
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* {@inheritdoc}
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*/
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public function get($key, $default = null)
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{
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$miss = null !== $default && is_object($default) ? $default : $this->miss;
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foreach ($this->caches as $i => $cache) {
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$value = $cache->get($key, $miss);
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if ($miss !== $value) {
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while (0 <= --$i) {
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$this->caches[$i]->set($key, $value, $this->defaultLifetime);
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}
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return $value;
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}
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}
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return $default;
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}
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/**
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* {@inheritdoc}
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*/
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public function getMultiple($keys, $default = null)
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{
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$miss = null !== $default && is_object($default) ? $default : $this->miss;
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return $this->generateItems($this->caches[0]->getMultiple($keys, $miss), 0, $miss, $default);
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}
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private function generateItems($values, $cacheIndex, $miss, $default)
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{
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$missing = array();
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$nextCacheIndex = $cacheIndex + 1;
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$nextCache = isset($this->caches[$nextCacheIndex]) ? $this->caches[$nextCacheIndex] : null;
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foreach ($values as $k => $value) {
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if ($miss !== $value) {
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yield $k => $value;
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} elseif (!$nextCache) {
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yield $k => $default;
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} else {
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$missing[] = $k;
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}
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}
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if ($missing) {
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$cache = $this->caches[$cacheIndex];
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$values = $this->generateItems($nextCache->getMultiple($missing, $miss), $nextCacheIndex, $miss, $default);
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foreach ($values as $k => $value) {
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if ($miss !== $value) {
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$cache->set($k, $value, $this->defaultLifetime);
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yield $k => $value;
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} else {
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yield $k => $default;
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}
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}
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}
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}
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/**
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* {@inheritdoc}
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*/
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public function has($key)
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{
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foreach ($this->caches as $cache) {
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if ($cache->has($key)) {
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return true;
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}
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}
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return false;
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}
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/**
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* {@inheritdoc}
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*/
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public function clear()
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{
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$cleared = true;
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$i = $this->cacheCount;
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while ($i--) {
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$cleared = $this->caches[$i]->clear() && $cleared;
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}
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return $cleared;
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}
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/**
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* {@inheritdoc}
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*/
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public function delete($key)
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{
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$deleted = true;
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$i = $this->cacheCount;
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while ($i--) {
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$deleted = $this->caches[$i]->delete($key) && $deleted;
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}
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return $deleted;
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}
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/**
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* {@inheritdoc}
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*/
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public function deleteMultiple($keys)
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{
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if ($keys instanceof \Traversable) {
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$keys = iterator_to_array($keys, false);
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}
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$deleted = true;
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$i = $this->cacheCount;
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while ($i--) {
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$deleted = $this->caches[$i]->deleteMultiple($keys) && $deleted;
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}
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return $deleted;
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}
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/**
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* {@inheritdoc}
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*/
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public function set($key, $value, $ttl = null)
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{
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$saved = true;
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$i = $this->cacheCount;
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while ($i--) {
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$saved = $this->caches[$i]->set($key, $value, $ttl) && $saved;
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}
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return $saved;
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}
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/**
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* {@inheritdoc}
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*/
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public function setMultiple($values, $ttl = null)
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{
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if ($values instanceof \Traversable) {
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$valuesIterator = $values;
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$values = function () use ($valuesIterator, &$values) {
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$generatedValues = array();
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foreach ($valuesIterator as $key => $value) {
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yield $key => $value;
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$generatedValues[$key] = $value;
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}
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$values = $generatedValues;
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};
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$values = $values();
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}
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$saved = true;
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$i = $this->cacheCount;
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while ($i--) {
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$saved = $this->caches[$i]->setMultiple($values, $ttl) && $saved;
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}
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return $saved;
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}
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/**
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* {@inheritdoc}
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*/
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public function prune()
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{
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$pruned = true;
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foreach ($this->caches as $cache) {
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if ($cache instanceof PruneableInterface) {
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$pruned = $cache->prune() && $pruned;
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}
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}
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return $pruned;
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}
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/**
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* {@inheritdoc}
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*/
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public function reset()
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{
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foreach ($this->caches as $cache) {
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if ($cache instanceof ResettableInterface) {
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$cache->reset();
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}
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}
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}
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}
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