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<?php | |
/** | |
* @file | |
* Contains \Drupal\Core\Cache\MemoryBackend. | |
*/ | |
namespace Drupal\Core\Cache; | |
/** | |
* Defines a memory cache implementation. | |
* | |
* Stores cache items in memory using a PHP array. | |
* | |
* Should be used for unit tests and specialist use-cases only, does not | |
* store cached items between requests. | |
* | |
* @ingroup cache | |
*/ | |
class MemoryBackend implements CacheBackendInterface, CacheTagsInvalidatorInterface { | |
/** | |
* Array to store cache objects. | |
*/ | |
protected $cache = array(); | |
/** | |
* Constructs a MemoryBackend object. | |
* | |
* @param string $bin | |
* The cache bin for which the object is created. | |
*/ | |
public function __construct($bin) { | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function get($cid, $allow_invalid = FALSE) { | |
if (isset($this->cache[$cid])) { | |
return $this->prepareItem($this->cache[$cid], $allow_invalid); | |
} | |
else { | |
return FALSE; | |
} | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function getMultiple(&$cids, $allow_invalid = FALSE) { | |
$ret = array(); | |
$items = array_intersect_key($this->cache, array_flip($cids)); | |
foreach ($items as $item) { | |
$item = $this->prepareItem($item, $allow_invalid); | |
if ($item) { | |
$ret[$item->cid] = $item; | |
} | |
} | |
$cids = array_diff($cids, array_keys($ret)); | |
return $ret; | |
} | |
/** | |
* Prepares a cached item. | |
* | |
* Checks that items are either permanent or did not expire, and returns data | |
* as appropriate. | |
* | |
* @param object $cache | |
* An item loaded from cache_get() or cache_get_multiple(). | |
* @param bool $allow_invalid | |
* (optional) If TRUE, cache items may be returned even if they have expired | |
* or been invalidated. | |
* | |
* @return mixed | |
* The item with data as appropriate or FALSE if there is no | |
* valid item to load. | |
*/ | |
protected function prepareItem($cache, $allow_invalid) { | |
if (!isset($cache->data)) { | |
return FALSE; | |
} | |
// The object passed into this function is the one stored in $this->cache. | |
// We must clone it as part of the preparation step so that the actual | |
// cache object is not affected by the unserialize() call or other | |
// manipulations of the returned object. | |
$prepared = clone $cache; | |
$prepared->data = unserialize($prepared->data); | |
// Check expire time. | |
$prepared->valid = $prepared->expire == Cache::PERMANENT || $prepared->expire >= $this->getRequestTime(); | |
if (!$allow_invalid && !$prepared->valid) { | |
return FALSE; | |
} | |
return $prepared; | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function set($cid, $data, $expire = Cache::PERMANENT, array $tags = array()) { | |
assert('\Drupal\Component\Assertion\Inspector::assertAllStrings($tags)', 'Cache Tags must be strings.'); | |
$tags = array_unique($tags); | |
// Sort the cache tags so that they are stored consistently in the database. | |
sort($tags); | |
$this->cache[$cid] = (object) array( | |
'cid' => $cid, | |
'data' => serialize($data), | |
'created' => $this->getRequestTime(), | |
'expire' => $expire, | |
'tags' => $tags, | |
); | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function setMultiple(array $items = array()) { | |
foreach ($items as $cid => $item) { | |
$this->set($cid, $item['data'], isset($item['expire']) ? $item['expire'] : CacheBackendInterface::CACHE_PERMANENT, isset($item['tags']) ? $item['tags'] : array()); | |
} | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function delete($cid) { | |
unset($this->cache[$cid]); | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function deleteMultiple(array $cids) { | |
$this->cache = array_diff_key($this->cache, array_flip($cids)); | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function deleteAll() { | |
$this->cache = array(); | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function invalidate($cid) { | |
if (isset($this->cache[$cid])) { | |
$this->cache[$cid]->expire = $this->getRequestTime() - 1; | |
} | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function invalidateMultiple(array $cids) { | |
foreach ($cids as $cid) { | |
$this->cache[$cid]->expire = $this->getRequestTime() - 1; | |
} | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function invalidateTags(array $tags) { | |
foreach ($this->cache as $cid => $item) { | |
if (array_intersect($tags, $item->tags)) { | |
$this->cache[$cid]->expire = $this->getRequestTime() - 1; | |
} | |
} | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function invalidateAll() { | |
foreach ($this->cache as $cid => $item) { | |
$this->cache[$cid]->expire = $this->getRequestTime() - 1; | |
} | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function garbageCollection() { | |
} | |
/** | |
* {@inheritdoc} | |
*/ | |
public function removeBin() { | |
$this->cache = []; | |
} | |
/** | |
* Wrapper method for REQUEST_TIME constant. | |
* | |
* @return int | |
*/ | |
protected function getRequestTime() { | |
return defined('REQUEST_TIME') ? REQUEST_TIME : (int) $_SERVER['REQUEST_TIME']; | |
} | |
/** | |
* Prevents data stored in memory backends from being serialized. | |
*/ | |
public function __sleep() { | |
return []; | |
} | |
/** | |
* Reset statically cached variables. | |
* | |
* This is only used by tests. | |
*/ | |
public function reset() { | |
$this->cache = []; | |
} | |
} |