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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\Simple;
use Psr\SimpleCache\CacheInterface as Psr16CacheInterface;
use Symfony\Component\Cache\Adapter\ChainAdapter;
use Symfony\Component\Cache\Exception\InvalidArgumentException;
use Symfony\Component\Cache\PruneableInterface;
use Symfony\Component\Cache\ResettableInterface;
use Symfony\Contracts\Cache\CacheInterface;
use Symfony\Contracts\Service\ResetInterface;
@trigger_error(sprintf('The "%s" class is deprecated since Symfony 4.3, use "%s" and type-hint for "%s" instead.', ChainCache::class, ChainAdapter::class, CacheInterface::class), E_USER_DEPRECATED);
/**
* Chains several caches together.
*
* Cached items are fetched from the first cache having them in its data store.
* They are saved and deleted in all caches at once.
*
* @deprecated since Symfony 4.3, use ChainAdapter and type-hint for CacheInterface instead.
*/
class ChainCache implements Psr16CacheInterface, PruneableInterface, ResettableInterface
{
private $miss;
private $caches = [];
private $defaultLifetime;
private $cacheCount;
/**
* @param Psr16CacheInterface[] $caches The ordered list of caches used to fetch cached items
* @param int $defaultLifetime The lifetime of items propagated from lower caches to upper ones
*/
public function __construct(array $caches, int $defaultLifetime = 0)
{
if (!$caches) {
throw new InvalidArgumentException('At least one cache must be specified.');
}
foreach ($caches as $cache) {
if (!$cache instanceof Psr16CacheInterface) {
throw new InvalidArgumentException(sprintf('The class "%s" does not implement the "%s" interface.', \get_class($cache), Psr16CacheInterface::class));
}
}
$this->miss = new \stdClass();
$this->caches = array_values($caches);
$this->cacheCount = \count($this->caches);
$this->defaultLifetime = 0 < $defaultLifetime ? $defaultLifetime : null;
}
/**
* {@inheritdoc}
*/
public function get($key, $default = null)
{
$miss = null !== $default && \is_object($default) ? $default : $this->miss;
foreach ($this->caches as $i => $cache) {
$value = $cache->get($key, $miss);
if ($miss !== $value) {
while (0 <= --$i) {
$this->caches[$i]->set($key, $value, $this->defaultLifetime);
}
return $value;
}
}
return $default;
}
/**
* {@inheritdoc}
*/
public function getMultiple($keys, $default = null)
{
$miss = null !== $default && \is_object($default) ? $default : $this->miss;
return $this->generateItems($this->caches[0]->getMultiple($keys, $miss), 0, $miss, $default);
}
private function generateItems($values, $cacheIndex, $miss, $default)
{
$missing = [];
$nextCacheIndex = $cacheIndex + 1;
$nextCache = isset($this->caches[$nextCacheIndex]) ? $this->caches[$nextCacheIndex] : null;
foreach ($values as $k => $value) {
if ($miss !== $value) {
yield $k => $value;
} elseif (!$nextCache) {
yield $k => $default;
} else {
$missing[] = $k;
}
}
if ($missing) {
$cache = $this->caches[$cacheIndex];
$values = $this->generateItems($nextCache->getMultiple($missing, $miss), $nextCacheIndex, $miss, $default);
foreach ($values as $k => $value) {
if ($miss !== $value) {
$cache->set($k, $value, $this->defaultLifetime);
yield $k => $value;
} else {
yield $k => $default;
}
}
}
}
/**
* {@inheritdoc}
*/
public function has($key)
{
foreach ($this->caches as $cache) {
if ($cache->has($key)) {
return true;
}
}
return false;
}
/**
* {@inheritdoc}
*/
public function clear()
{
$cleared = true;
$i = $this->cacheCount;
while ($i--) {
$cleared = $this->caches[$i]->clear() && $cleared;
}
return $cleared;
}
/**
* {@inheritdoc}
*/
public function delete($key)
{
$deleted = true;
$i = $this->cacheCount;
while ($i--) {
$deleted = $this->caches[$i]->delete($key) && $deleted;
}
return $deleted;
}
/**
* {@inheritdoc}
*/
public function deleteMultiple($keys)
{
if ($keys instanceof \Traversable) {
$keys = iterator_to_array($keys, false);
}
$deleted = true;
$i = $this->cacheCount;
while ($i--) {
$deleted = $this->caches[$i]->deleteMultiple($keys) && $deleted;
}
return $deleted;
}
/**
* {@inheritdoc}
*/
public function set($key, $value, $ttl = null)
{
$saved = true;
$i = $this->cacheCount;
while ($i--) {
$saved = $this->caches[$i]->set($key, $value, $ttl) && $saved;
}
return $saved;
}
/**
* {@inheritdoc}
*/
public function setMultiple($values, $ttl = null)
{
if ($values instanceof \Traversable) {
$valuesIterator = $values;
$values = function () use ($valuesIterator, &$values) {
$generatedValues = [];
foreach ($valuesIterator as $key => $value) {
yield $key => $value;
$generatedValues[$key] = $value;
}
$values = $generatedValues;
};
$values = $values();
}
$saved = true;
$i = $this->cacheCount;
while ($i--) {
$saved = $this->caches[$i]->setMultiple($values, $ttl) && $saved;
}
return $saved;
}
/**
* {@inheritdoc}
*/
public function prune()
{
$pruned = true;
foreach ($this->caches as $cache) {
if ($cache instanceof PruneableInterface) {
$pruned = $cache->prune() && $pruned;
}
}
return $pruned;
}
/**
* {@inheritdoc}
*/
public function reset()
{
foreach ($this->caches as $cache) {
if ($cache instanceof ResetInterface) {
$cache->reset();
}
}
}
}
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