/**
* Constructs a new cache.
*
* This constructor requires a storage engine and the cache size as parameters.
*
* Only storage engines with enabled timestamps are accepted.
*
* Size determines the maximum number of items this cache can hold. If the provided size differs
* from the size of the stored data, this cache will be resized automatically.
*
* @param StorageEngine the storage engine
* @param int $site the size of the cache
* @throws InvalidArgumentException if the storage engine doesn't use timestamps
*/
public function __construct(StorageEngine $engine, $size)
{
if (!$engine->getUseTimestamps()) {
throw new InvalidArgumentException(__CLASS__ . ' requires a storage engine with enabled timestamps');
}
$this->engine = $engine;
$this->size = $size;
$this->resize();
}
public function size()
{
return $this->engine->size();
}
