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

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<?php
/**
 * This factory returns you the data store that are the best for your requirements.
 * @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: 2015 06 29
 * @since       PHPBoost 3.0 - 2009 12 09
 * @contributor Loic ROUCHON <horn@phpboost.com>
 * @contributor Julien BRISWALTER <j1.seth@phpboost.com>
*/

class DataStoreFactory
{
    private static $apc_available = null;
    private static $apc_enabled = null;

    /**
     * Returns an efficient data store whose life span can be not infinite.
     * @param string $id Identifier of the data store.
     * @return DataStore The best data store you can use with the current configuration
     */
    public static function get_ram_store($id)
    {
        if (self::is_apc_available() && self::is_apc_enabled())
        {
            return new APCDataStore($id);
        }
        return new RAMDataStore();
    }

    /**
     * Returns an infinite-life span data store that can be not very efficient.
     * @param string $id Identifier of the data store.
     * @return DataStore The best data store you can use with the current configuration
     */
    public static function get_filesystem_store($id)
    {
        if (self::is_apc_available() && self::is_apc_enabled())
        {
            return new APCDataStore($id);
        }
        return new FileSystemDataStore($id);
    }

    public static function is_apc_available()
    {
        if (self::$apc_available === null)
        {
            if (function_exists('apc_cache_info') && (extension_loaded('apc') || extension_loaded('apcu')) && ini_get('apc.enabled'))
            {
                self::$apc_available = true;
            }
            else
            {
                self::$apc_available = false;
            }
        }
        return self::$apc_available;
    }

    public static function is_apc_enabled()
    {
        if (self::$apc_available !== null && self::$apc_enabled === null)
        {
            $file = new File(PATH_TO_ROOT . '/cache/apc.php');
            if ($file->exists())
            {
                include $file->get_path();
                if (isset($enable_apc))
                {
                    return $enable_apc;
                }
            }
        }
        return false;
    }

    /**
     * Enables or disables APC. Writes in the file /cache/apc.php
     * @param bool $enabled
     * @throws IOException If the file cannot be written
     */
    public static function set_apc_enabled($enabled)
    {
        $file = new File(PATH_TO_ROOT . '/cache/apc.php');
        $file->write('<?php $enable_apc = ' . ($enabled ?  'true' : 'false') . ';');
        $file->close();
    }
}
?>