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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\Traits;
use Psr\Cache\CacheItemInterface;
use Symfony\Component\Cache\CacheItem;
use Symfony\Component\Cache\Exception\InvalidArgumentException;
/**
* @author Nicolas Grekas <p@tchwork.com>
*
* @internal
*/
trait AbstractAdapterTrait
{
use AbstractTrait;
/**
* @var \Closure needs to be set by class, signature is function(string <key>, mixed <value>, bool <isHit>)
*/
private $createCacheItem;
/**
* @var \Closure needs to be set by class, signature is function(array <deferred>, string <namespace>, array <&expiredIds>)
*/
private $mergeByLifetime;
/**
* {@inheritdoc}
*/
public function getItem($key)
{
$id = $this->getId($key);
if (isset($this->deferred[$key])) {
$this->commit();
}
$f = $this->createCacheItem;
$isHit = false;
$value = null;
try {
foreach ($this->doFetch([$id]) as $value) {
$isHit = true;
}
return $f($key, $value, $isHit);
} catch (\Exception $e) {
CacheItem::log($this->logger, 'Failed to fetch key "{key}": '.$e->getMessage(), ['key' => $key, 'exception' => $e]);
}
return $f($key, null, false);
}
/**
* {@inheritdoc}
*/
public function getItems(array $keys = [])
{
$ids = [];
$commit = false;
foreach ($keys as $key) {
$ids[] = $this->getId($key);
$commit = $commit || isset($this->deferred[$key]);
}
if ($commit) {
$this->commit();
}
try {
$items = $this->doFetch($ids);
} catch (\Exception $e) {
CacheItem::log($this->logger, 'Failed to fetch items: '.$e->getMessage(), ['keys' => $keys, 'exception' => $e]);
$items = [];
}
$ids = array_combine($ids, $keys);
return $this->generateItems($items, $ids);
}
/**
* {@inheritdoc}
*
* @return bool
*/
public function save(CacheItemInterface $item)
{
if (!$item instanceof CacheItem) {
return false;
}
$this->deferred[$item->getKey()] = $item;
return $this->commit();
}
/**
* {@inheritdoc}
*
* @return bool
*/
public function saveDeferred(CacheItemInterface $item)
{
if (!$item instanceof CacheItem) {
return false;
}
$this->deferred[$item->getKey()] = $item;
return true;
}
/**
* @return array
*/
public function __sleep()
{
throw new \BadMethodCallException('Cannot serialize '.__CLASS__);
}
public function __wakeup()
{
throw new \BadMethodCallException('Cannot unserialize '.__CLASS__);
}
public function __destruct()
{
if ($this->deferred) {
$this->commit();
}
}
private function generateItems(iterable $items, array &$keys): iterable
{
$f = $this->createCacheItem;
try {
foreach ($items as $id => $value) {
if (!isset($keys[$id])) {
throw new InvalidArgumentException(sprintf('Could not match value id "%s" to keys "%s".', $id, implode('", "', $keys)));
}
$key = $keys[$id];
unset($keys[$id]);
yield $key => $f($key, $value, true);
}
} catch (\Exception $e) {
CacheItem::log($this->logger, 'Failed to fetch items: '.$e->getMessage(), ['keys' => array_values($keys), 'exception' => $e]);
}
foreach ($keys as $key) {
yield $key => $f($key, null, false);
}
}
}
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