使用zend framework 搭建网站(六)--为Zend_Session 添加一个Memcache_ SaveHandler

使用zend framework 搭建网站(六)--为Zend_Session 添加一个Memcache_ SaveHandler

2008/11/25 10:05 A.M.

在zend framework中，已经可以将session存储在数据库中了，不过还不支持memcache，我简单得实现了一下。           下面是SaveHandler，文件名为 ：Memcached.php ，将其放在 /Zend/Session/SaveHandler 目录下，代码如下( 需要有php_memcache支持,因为字符长度限制,我把部分注释去掉了): <?php require_once 'Zend/Session.php'; require_once 'Zend/Config.php'; class Zend_Session_SaveHandler_Memcached implements Zend_Session_SaveHandler_Interface {     const LIFETIME          = 'lifetime';     const OVERRIDE_LIFETIME = 'overrideLifetime';     const MEMCACHED            = 'memcached';     protected $_lifetime = false;     protected $_overrideLifetime = false;     protected $_sessionSavePath;     protected $_sessionName;     protected $_memcached;     /**      * Constructor      *      * $config is an instance of Zend_Config or an array of key/value pairs containing configuration options for      * Zend_Session_SaveHandler_Memcached . These are the configuration options for      * Zend_Session_SaveHandler_Memcached:      *      *      *      sessionId       => The id of the current session      *      sessionName     => The name of the current session      *      sessionSavePath => The save path of the current session      *      * modified            => (string) Session last modification time column      *      * lifetime          => (integer) Session lifetime (optional; default: ini_get('session.gc_maxlifetime'))      *      * overrideLifetime => (boolean) Whether or not the lifetime of an existing session should be overridden      *      (optional; default: false)      *      * @param Zend_Config|array $config      User-provided configuration      * @return void      * @throws Zend_Session_SaveHandler_Exception      */     public function __construct($config)     {         if ($config instanceof Zend_Config) {             $config = $config->toArray();         } else if (!is_array($config)) {             /**              * @see Zend_Session_SaveHandler_Exception              */             require_once 'Zend/Session/SaveHandler/Exception.php';             throw new Zend_Session_SaveHandler_Exception(                 '$config must be an instance of Zend_Config or array of key/value pairs containing '               . 'configuration options for Zend_Session_SaveHandler_Memcached .');         }         foreach ($config as $key => $value) {             do {                 switch ($key) {                     case self::MEMCACHED:                         $this->createMemcached($value);                         break;                     case self::LIFETIME:                         $this->setLifetime($value);                         break;                     case self::OVERRIDE_LIFETIME:                         $this->setOverrideLifetime($value);                         break;                     default:                         // unrecognized options passed to parent::__construct()                         break 2;                 }                 unset($config[$key]);             } while (false);         }     }         /**      * 创建memcached连接对象      *       * @return void      */     public function createMemcached($config){       $mc = new Memcache;       foreach ($config as $value){         $mc->addServer($value['ip'], $value['port']);       }       $this->_memcached = $mc;     }     public function __destruct()     {         Zend_Session::writeClose();     }    /**      * Set session lifetime and optional whether or not the lifetime of an existing session should be overridden      *      * $lifetime === false resets lifetime to session.gc_maxlifetime      *      * @param int $lifetime      * @param boolean $overrideLifetime (optional)      * @return Zend_Session_SaveHandler_Memcached      */     public function setLifetime($lifetime, $overrideLifetime = null)     {         if ($lifetime < 0) {             /**              * @see Zend_Session_SaveHandler_Exception              */             require_once 'Zend/Session/SaveHandler/Exception.php';             throw new Zend_Session_SaveHandler_Exception();         } else if (empty($lifetime)) {             $this->_lifetime = (int) ini_get('session.gc_maxlifetime');         } else {             $this->_lifetime = (int) $lifetime;         }         if ($overrideLifetime != null) {             $this->setOverrideLifetime($overrideLifetime);         }         return $this;     }     /**      * Retrieve session lifetime      *      * @return int      */     public function getLifetime()     {         return $this->_lifetime;     }     /**      * Set whether or not the lifetime of an existing session should be overridden      *      * @param boolean $overrideLifetime      * @return Zend_Session_SaveHandler_Memcached      */     public function setOverrideLifetime($overrideLifetime)     {         $this->_overrideLifetime = (boolean) $overrideLifetime;         return $this;     }     public function getOverrideLifetime()     {         return $this->_overrideLifetime;     }     /**      * Retrieve session lifetime considering       *      * @param array $value      * @return int      */     public function open($save_path, $name)     {         $this->_sessionSavePath = $save_path;         $this->_sessionName     = $name;         return true;     }     /**      * Retrieve session expiration time      *      * @param * @param array $value      * @return int      */     public function close()     {         return true;     }     public function read($id)     {         $return = '';         $value = $this->_memcached->get($id);                        //获取数据         if ($value) {             if ($this->_getExpirationTime($value) > time()) {                 $return = $value['data'];             } else {                 $this->destroy($id);             }         }         return $return;     }     public function write($id, $data)     {         $return = false;                                 $insertDate = array('modified' => time(),                               'data'     => (string) $data);                                           $value = $this->_memcached->get($id);                        //获取数据         if ($value) {             $insertDate['lifetime'] = $this->_getLifetime($value);                          if ($this->_memcached->replace($id,$insertDate)) {                 $return = true;             }         } else {             $insertDate['lifetime'] = $this->_lifetime;             if ($this->_memcached->add($id, $insertDate,false,$this->_lifetime)) {                 $return = true;             }         }                  return $return;     }     public function destroy($id)     {         $return = false;         if ($this->_memcached->delete($id)) {             $return = true;         }         return $return;     }     public function gc($maxlifetime)     {         return true;     }     protected function _getLifetime($value)     {         $return = $this->_lifetime;         if (!$this->_overrideLifetime) {             $return = (int) $value['lifetime'];         }         return $return;     }     protected function _getExpirationTime($value)     {         return (int) $value['modified'] + $this->_getLifetime($value);     }        } 配置（可以添加多台memcache服务器，做分布式）: $config = array(     'memcached'=> array(         array(             'ip'=>'192.168.0.1',               'port'=>11211         )     ),     'lifetime' =>123334 ); //create your  Zend_Session_SaveHandler_Memcached //set the save handler for Zend_Session  Zend_Session::setSaveHandler(new Zend_Session_SaveHandler_Memcached($config)); //start your session! Zend_Session::start();  配置好后，session的使用方法和以前一样，不用管底层是怎么实现的！ 冷锋:   http://hi.baidu.com/billdkj/blog/item/049d04f0b2a896c47831aa1c.html