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<?php |
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/** |
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* Util |
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* |
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* @copyright Copyright (c) Gjero Krsteski (http://krsteski.de) |
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* @license http://opensource.org/licenses/MIT MIT License |
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*/ |
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namespace Pimf\Util; |
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/** |
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* The identity map pattern is a database access design pattern used to improve performance |
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* by providing a context-specific, in-memory cache to prevent duplicate retrieval of the |
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* same object data from the database. |
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* |
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* @package Util |
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* @author Gjero Krsteski <[email protected]> |
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*/ |
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class IdentityMap |
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{ |
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/** |
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* @var \ArrayObject |
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*/ |
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protected $idToObject; |
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/** |
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* @var \SplObjectStorage |
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*/ |
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protected $objectToId; |
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public function __construct() |
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{ |
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$this->objectToId = new \SplObjectStorage(); |
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$this->idToObject = new \ArrayObject(); |
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} |
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/** |
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* @param integer $key |
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* @param mixed $object |
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*/ |
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public function set($key, $object) |
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{ |
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$this->idToObject[$key] = $object; |
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$this->objectToId[$object] = $key; |
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} |
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/** |
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* @param mixed $object |
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* |
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* @throws \OutOfBoundsException |
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* @return integer |
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*/ |
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public function getId($object) |
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{ |
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if (false === $this->hasObject($object)) { |
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throw new \OutOfBoundsException('no object=' . get_class($object) . ' at the identity-map'); |
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} |
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return $this->objectToId[$object]; |
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} |
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/** |
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* @param integer $key |
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* |
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* @return boolean |
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*/ |
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public function hasId($key) |
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{ |
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return isset($this->idToObject[$key]); |
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} |
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/** |
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* @param mixed $object |
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* |
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* @return boolean |
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*/ |
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public function hasObject($object) |
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{ |
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return isset($this->objectToId[$object]); |
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} |
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/** |
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* @param integer $key |
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* |
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* @throws \OutOfBoundsException |
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* @return object |
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*/ |
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public function getObject($key) |
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{ |
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if (false === $this->hasId($key)) { |
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throw new \OutOfBoundsException('no id=' . $key . ' at the identity-map'); |
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} |
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return $this->idToObject[$key]; |
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} |
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} |
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gjerokrsteski /
pimf-framework
