/sbweb/sbweb_logica/lib/symfony/plugins/sfCompat10Plugin/lib/cache/sfProcessCache.class.php

<?php



/*

 * This file is part of the symfony package.

 * (c) 2004-2006 Fabien Potencier <fabien.potencier@symfony-project.com>

 *

 * For the full copyright and license information, please view the LICENSE

 * file that was distributed with this source code.

 */



/**

 * sfProcessCache stores content in memory if you run a PHP accelerator.

 *

 * Current PHP accelerator supported: APC, XCache and Eaccelerator.

 *

 * @package    symfony

 * @subpackage cache

 * @author     Fabien Potencier <fabien.potencier@symfony-project.com>

 * @version    SVN: $Id$

 */

class sfProcessCache

{

  /**

   * Gets the cache engine name or false if no PHP accelerator is enabled.

   *

   * @return string The cache engine name

   */

  public static function cacher()

  {

    static $cacher = null;



    if (null === $cacher)

    {

      if (!sfConfig::get('sf_use_process_cache'))

      {

        $cacher = false;

      }

      elseif (function_exists('apc_store'))

      {

        $cacher = 'apc';

      }

      elseif (function_exists('xcache_set'))

      {

        $cacher = 'xcache';

      }

      elseif (function_exists('eaccelerator_put'))

      {

        $cacher = 'eaccelerator';

      }

      else

      {

        $cacher = false;

      }

    }



    return $cacher;

  }



  /**

   * Gets the prefix to use for all key name.

   *

   * @return string The prefix string

   */

  public static function getPrefix()

  {

    static $prefix = null;



    if (!$prefix)

    {

      $prefix = md5(sfConfig::get('sf_app_dir')).'_';

    }



    return $prefix;

  }



  /**

   * Sets a value in the cache for the specified key.

   *

   * @param string The key name

   * @param string The content to put in cache

   * @param int The life time to keep the content in the cache in seconds

   *

   * @return boolean true if ok

   */

  public static function set($key, $value, $lifeTime = 0)

  {

    switch (self::cacher())

    {

      case 'apc':

        return apc_store(self::getPrefix().$key, $value, $lifeTime);

      case 'xcache':

        return xcache_set(self::getPrefix().$key, $value, $lifeTime);

      case 'eaccelerator':

        return eaccelerator_put(self::getPrefix().$key, serialize($value), $lifeTime);

    }



    return false;

  }



  /**

   * Gets a value in the cache for the specified key.

   *

   * @param string The key name

   *

   * @return mixed The content associated with the key or null if the key does not exist

   */

  public static function get($key)

  {

    switch (self::cacher())

    {

      case 'apc':

        $value = apc_fetch(self::getPrefix().$key);

        return false === $value ? null : $value;

      case 'xcache':

        return xcache_isset(self::getPrefix().$key) ? xcache_get(self::getPrefix().$key) : null;

      case 'eaccelerator':

        return unserialize(eaccelerator_get(self::getPrefix().$key));

    }



    return null;

  }



  /**

   * Returns true if a given key exists in the cache, false otherwise.

   *

   * @param string The key name

   *

   * @return boolean true if the key exists, false otherwise

   */

  public static function has($key)

  {

    switch (self::cacher())

    {

      case 'apc':

        return false === apc_fetch(self::getPrefix().$key) ? false : true;

      case 'xcache':

        return xcache_isset(self::getPrefix().$key);

      case 'eaccelerator':

        return null === eaccelerator_get(self::getPrefix().$key) ? false : true;

    }



    return false;

  }



  /**

   * Clears the cache.

   *

   * @return boolean true if ok, false otherwise

   */

  public static function clear()

  {

    switch (self::cacher())

    {

      case 'apc':

        return apc_clear_cache('user');

      case 'xcache':

        for ($i = 0, $max = xcache_count(XC_TYPE_VAR); $i < $max; $i++)

        {

          if (!xcache_clear_cache(XC_TYPE_VAR, $i))

          {

            return false;

          }

        }

        return true;

      case 'eaccelerator':

        $infos = eaccelerator_list_keys();

        if (is_array($infos))

        {

          foreach ($infos as $info)

          {

            // eaccelerator bug (http://eaccelerator.net/ticket/287)

            $key = 0 === strpos($info['name'], ':') ? substr($info['name'], 1) : $info['name'];

            if (!eaccelerator_rm($key))

            {

              return false;

            }

          }

        }



        return true;

    }



    return false;

  }

}