Classes

File io/data/store/APCDataStore.class.php

File io/data/store/APCDataStore.class.php

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<?php
/**
 * This data store is not already available, the APC PHP extension must be enabled for you yo use it.
 * When it's available, it provides a memory area that is persistent (its life span is no the page execution) and
 * shared by all simultaneous page executions.
 * This is very efficient and has an infinite life span (in fact it's the Web server's one).
 * @package     IO
 * @subpackage  Data\store
 * @copyright   &copy; 2005-2019 PHPBoost
 * @license     https://www.gnu.org/licenses/gpl-3.0.html GNU/GPL-3.0
 * @author      Benoit SAUTEL <ben.popeye@phpboost.com>
 * @version     PHPBoost 5.2 - last update: 2016 10 28
 * @since       PHPBoost 3.0 - 2009 09 16
 * @contributor Loic ROUCHON <horn@phpboost.com>
 * @contributor Julien BRISWALTER <j1.seth@phpboost.com>
 * @contributor Arnaud GENET <elenwii@phpboost.com>
*/

class APCDataStore implements DataStore
{
    private static $website_id = false;

    private $cache_id;

    private static $apc_fields_id = '_apc_fields';

    private $apc_fields = array();

    public function __construct($cache_id)
    {
        $this->cache_id = self::get_website_id() . '-' . $cache_id;
        $this->retrieve_apc_fields();
    }

    /**
     * {@inheritdoc}
     */
    public function get($id)
    {
        $id = $this->get_full_object_id($id);
        $found = false;
        $object = apc_fetch($id, $found);
        if (!$found)
        {
            throw new DataStoreException($id);
        }
        return $object;
    }

    /**
     * {@inheritdoc}
     */
    public function contains($id)
    {
        $id = $this->get_full_object_id($id);
        $found = false;
        apc_fetch($id, $found);
        return $found;
    }

    /**
     * {@inheritdoc}
     */
    public function store($id, $object)
    {
        $this->add_apc_field($id);
        $id = $this->get_full_object_id($id);
        return (bool) apc_store($id, $object);
    }

    /**
     * {@inheritdoc}
     */
    public function delete($id)
    {
        $this->delete_apc_field($id);
        $id = $this->get_full_object_id($id);
        return apc_delete($id);
    }

    private function get_full_object_id($tiny_id)
    {
        return $this->cache_id . '-' . $tiny_id;
    }

    private static function get_website_id()
    {
        if (self::$website_id === false)
        {
            $website_id_cache_file = PATH_TO_ROOT . '/cache/website_id.cfg';
            if (file_exists($website_id_cache_file))
            {
                self::$website_id = @file_get_contents($website_id_cache_file);
            }
            if (self::$website_id === false)
            {
                self::$website_id = TextHelper::substr(md5(realpath(PATH_TO_ROOT)), 0, 10);
                $file = new File($website_id_cache_file);
                $file->write(self::$website_id);
                $file->close();
            }
        }
        return self::$website_id;
    }

    /**
     * {@inheritdoc}
     */
    public function clear()
    {
        // Copy the apc_fields array to avoid exceptions due to elements removed during foreach
        $apc_fields = $this->apc_fields;
        foreach ($apc_fields as $apc_field)
        {
            $this->delete($apc_field);
        }
    }

    private function retrieve_apc_fields()
    {
        if ($this->contains(self::$apc_fields_id))
        {
            $this->apc_fields = $this->get(self::$apc_fields_id);
        }
        else
        {
            $this->apc_fields = array();
        }
    }

    private function add_apc_field($field_name)
    {
        if (!in_array($field_name, $this->apc_fields))
        {
            $this->apc_fields[] = $field_name;
            $this->store(self::$apc_fields_id, $this->apc_fields);
        }
    }

    private function delete_apc_field($field_name)
    {
        $value_index = array_search($field_name, $this->apc_fields);
        if ($value_index !== false)
        {
            unset($this->apc_fields[$value_index]);
            $this->store(self::$apc_fields_id, $this->apc_fields);
        }
    }
}
?>
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