/**
* Confirms if the cache contains specified cache item.
*
* Note: This method MAY avoid retrieving the cached value for performance reasons.
* This could result in a race condition with CacheItemInterface::get(). To avoid
* such situation use CacheItemInterface::isHit() instead.
*
* @param string $key
* The key for which to check existence.
*
* @throws InvalidArgumentException
* If the $key string is not a legal value a \Psr\Cache\InvalidArgumentException
* MUST be thrown.
*
* @return bool
* True if item exists in the cache, false otherwise.
*/
public function hasItem($key)
{
Utility::validateKey($key);
if (isset($this->_queue[$key])) {
return true;
}
return $this->_cache->isExisting($key);
}
/**
* @return int
*/
public function filled()
{
return $this->cache->isExisting($this->key);
}
