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 <?php
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category   Zend
  * @package    Zend_Cache
  * @subpackage Zend_Cache_Backend
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 
 /** @see Zend_Cache_Backend_Interface */
 // require_once 'Zend/Cache/Backend/Interface.php';
 
 /** @see Zend_Cache_Backend */
 // require_once 'Zend/Cache/Backend.php';
 
 
 /**
  * @package    Zend_Cache
  * @subpackage Zend_Cache_Backend
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 abstract class Zend_Cache_Backend_ZendServer extends Zend_Cache_Backend implements Zend_Cache_Backend_Interface
 {
     /**
      * Available options
      *
      * =====> (string) namespace :
      * Namespace to be used for chaching operations
      *
      * @var array available options
      */
     protected $_options = array(
         'namespace' => 'zendframework'
     );
 
     /**
      * Store data
      *
      * @param mixed  $data        Object to store
      * @param string $id          Cache id
      * @param int    $timeToLive  Time to live in seconds
      * @throws Zend_Cache_Exception
      */
     abstract protected function _store($data, $id, $timeToLive);
 
     /**
      * Fetch data
      *
      * @param string $id          Cache id
      * @throws Zend_Cache_Exception
      */
     abstract protected function _fetch($id);
 
     /**
      * Unset data
      *
      * @param string $id          Cache id
      */
     abstract protected function _unset($id);
 
     /**
      * Clear cache
      */
     abstract protected function _clear();
 
     /**
      * Test if a cache is available for the given id and (if yes) return it (false else)
      *
      * @param  string  $id                     cache id
      * @param  boolean $doNotTestCacheValidity if set to true, the cache validity won't be tested
      * @return string cached datas (or false)
      */
     public function load($id, $doNotTestCacheValidity = false)
     {
         $tmp = $this->_fetch($id);
         if ($tmp !== null) {
             return $tmp;
         }
         return false;
     }
 
     /**
      * Test if a cache is available or not (for the given id)
      *
      * @param  string $id cache id
      * @return mixed false (a cache is not available) or "last modified" timestamp (int) of the available cache record
      * @throws Zend_Cache_Exception
      */
     public function test($id)
     {
         $tmp = $this->_fetch('internal-metadatas---' . $id);
         if ($tmp !== false) {
             if (!is_array($tmp) || !isset($tmp['mtime'])) {
                 Zend_Cache::throwException('Cache metadata for \'' . $id . '\' id is corrupted' );
             }
             return $tmp['mtime'];
         }
         return false;
     }
 
     /**
      * Compute & return the expire time
      *
      * @return int expire time (unix timestamp)
      */
     private function _expireTime($lifetime)
     {
         if ($lifetime === null) {
             return 9999999999;
         }
         return time() + $lifetime;
     }
 
     /**
      * Save some string datas into a cache record
      *
      * Note : $data is always "string" (serialization is done by the
      * core not by the backend)
      *
      * @param string $data datas to cache
      * @param string $id cache id
      * @param array $tags array of strings, the cache record will be tagged by each string entry
      * @param int $specificLifetime if != false, set a specific lifetime for this cache record (null => infinite lifetime)
      * @return boolean true if no problem
      */
     public function save($data, $id, $tags = array(), $specificLifetime = false)
     {
         $lifetime = $this->getLifetime($specificLifetime);
         $metadatas = array(
             'mtime' => time(),
             'expire' => $this->_expireTime($lifetime),
         );
 
         if (count($tags) > 0) {
             $this->_log('Zend_Cache_Backend_ZendServer::save() : tags are unsupported by the ZendServer backends');
         }
 
         return  $this->_store($data, $id, $lifetime) &&
                 $this->_store($metadatas, 'internal-metadatas---' . $id, $lifetime);
     }
 
     /**
      * Remove a cache record
      *
      * @param  string $id cache id
      * @return boolean true if no problem
      */
     public function remove($id)
     {
         $result1 = $this->_unset($id);
         $result2 = $this->_unset('internal-metadatas---' . $id);
 
         return $result1 && $result2;
     }
 
     /**
      * Clean some cache records
      *
      * Available modes are :
      * 'all' (default)  => remove all cache entries ($tags is not used)
      * 'old'            => unsupported
      * 'matchingTag'    => unsupported
      * 'notMatchingTag' => unsupported
      * 'matchingAnyTag' => unsupported
      *
      * @param  string $mode clean mode
      * @param  array  $tags array of tags
      * @throws Zend_Cache_Exception
      * @return boolean true if no problem
      */
     public function clean($mode = Zend_Cache::CLEANING_MODE_ALL, $tags = array())
     {
         switch ($mode) {
             case Zend_Cache::CLEANING_MODE_ALL:
                 $this->_clear();
                 return true;
                 break;
             case Zend_Cache::CLEANING_MODE_OLD:
                 $this->_log("Zend_Cache_Backend_ZendServer::clean() : CLEANING_MODE_OLD is unsupported by the Zend Server backends.");
                 break;
             case Zend_Cache::CLEANING_MODE_MATCHING_TAG:
             case Zend_Cache::CLEANING_MODE_NOT_MATCHING_TAG:
             case Zend_Cache::CLEANING_MODE_MATCHING_ANY_TAG:
                 $this->_clear();
                 $this->_log('Zend_Cache_Backend_ZendServer::clean() : tags are unsupported by the Zend Server backends.');
                 break;
             default:
                 Zend_Cache::throwException('Invalid mode for clean() method');
                 break;
         }
     }
 }