Subversion Repositories SmartDukaan

<?php

/**

 * APC storage engine for cache.

 *

 * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)

 * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)

 *

 * Licensed under The MIT License

 * For full copyright and license information, please see the LICENSE.txt

 * Redistributions of files must retain the above copyright notice.

 *

 * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)

 * @link          http://cakephp.org CakePHP(tm) Project

 * @package       Cake.Cache.Engine

 * @since         CakePHP(tm) v 1.2.0.4933

 * @license       http://www.opensource.org/licenses/mit-license.php MIT License

 */

/**

 * APC storage engine for cache

 *

 * @package       Cake.Cache.Engine

 */

class ApcEngine extends CacheEngine {

/**

 * Contains the compiled group names

 * (prefixed with the global configuration prefix)

 *

 * @var array

 */

	protected $_compiledGroupNames = array();

/**

 * Initialize the Cache Engine

 *

 * Called automatically by the cache frontend

 * To reinitialize the settings call Cache::engine('EngineName', [optional] settings = array());

 *

 * @param array $settings array of setting for the engine

 * @return bool True if the engine has been successfully initialized, false if not

 * @see CacheEngine::__defaults

 */

	public function init($settings = array()) {

		if (!isset($settings['prefix'])) {

			$settings['prefix'] = Inflector::slug(APP_DIR) . '_';

		}

		$settings += array('engine' => 'Apc');

		parent::init($settings);

		return function_exists('apc_dec');

	}

/**

 * Write data for key into cache

 *

 * @param string $key Identifier for the data

 * @param mixed $value Data to be cached

 * @param int $duration How long to cache the data, in seconds

 * @return bool True if the data was successfully cached, false on failure

 */

	public function write($key, $value, $duration) {

		$expires = 0;

		if ($duration) {

			$expires = time() + $duration;

		}

		apc_store($key . '_expires', $expires, $duration);

		return apc_store($key, $value, $duration);

	}

/**

 * Read a key from the cache

 *

 * @param string $key Identifier for the data

 * @return mixed The cached data, or false if the data doesn't exist, has expired, or if there was an error fetching it

 */

	public function read($key) {

		$time = time();

		$cachetime = (int)apc_fetch($key . '_expires');

		if ($cachetime !== 0 && ($cachetime < $time || ($time + $this->settings['duration']) < $cachetime)) {

			return false;

		}

		return apc_fetch($key);

	}

/**

 * Increments the value of an integer cached key

 *

 * @param string $key Identifier for the data

 * @param int $offset How much to increment

 * @return New incremented value, false otherwise

 */

	public function increment($key, $offset = 1) {

		return apc_inc($key, $offset);

	}

/**

 * Decrements the value of an integer cached key

 *

 * @param string $key Identifier for the data

 * @param int $offset How much to subtract

 * @return New decremented value, false otherwise

 */

	public function decrement($key, $offset = 1) {

		return apc_dec($key, $offset);

	}

/**

 * Delete a key from the cache

 *

 * @param string $key Identifier for the data

 * @return bool True if the value was successfully deleted, false if it didn't exist or couldn't be removed

 */

	public function delete($key) {

		return apc_delete($key);

	}

/**

 * Delete all keys from the cache. This will clear every cache config using APC.

 *

 * @param bool $check If true, nothing will be cleared, as entries are removed

 *    from APC as they expired. This flag is really only used by FileEngine.

 * @return bool True Returns true.

 */

	public function clear($check) {

		if ($check) {

			return true;

		}

		if (class_exists('APCIterator', false)) {

			$iterator = new APCIterator(

				'user',

				'/^' . preg_quote($this->settings['prefix'], '/') . '/',

				APC_ITER_NONE

			);

			apc_delete($iterator);

			return true;

		}

		$cache = apc_cache_info('user');

		foreach ($cache['cache_list'] as $key) {

			if (strpos($key['info'], $this->settings['prefix']) === 0) {

				apc_delete($key['info']);

			}

		}

		return true;

	}

/**

 * Returns the `group value` for each of the configured groups

 * If the group initial value was not found, then it initializes

 * the group accordingly.

 *

 * @return array

 */

	public function groups() {

		if (empty($this->_compiledGroupNames)) {

			foreach ($this->settings['groups'] as $group) {

				$this->_compiledGroupNames[] = $this->settings['prefix'] . $group;

			}

		}

		$groups = apc_fetch($this->_compiledGroupNames);

		if (count($groups) !== count($this->settings['groups'])) {

			foreach ($this->_compiledGroupNames as $group) {

				if (!isset($groups[$group])) {

					apc_store($group, 1);

					$groups[$group] = 1;

				}

			}

			ksort($groups);

		}

		$result = array();

		$groups = array_values($groups);

		foreach ($this->settings['groups'] as $i => $group) {

			$result[] = $group . $groups[$i];

		}

		return $result;

	}

/**

 * Increments the group value to simulate deletion of all keys under a group

 * old values will remain in storage until they expire.

 *

 * @param string $group The group to clear.

 * @return bool success

 */

	public function clearGroup($group) {

		apc_inc($this->settings['prefix'] . $group, 1, $success);

		return $success;

	}

}