<?php



/**

 *    基础缓存类接口

 *

 *    @author    Garbin

 *    @usage    none

 */

class CacheServer extends Object

{

    var $_options = null;

    function __construct($options = null)

    {

        $this->CacheServer($options);

    }

    function CacheServer($options = null)

    {

        $this->_options = $options;

    }



    /**

     *    获取缓存的数据

     *

     *    @author    Garbin

     *    @param     string $key

     *    @return    mixed

     */

    function &get($key){}

    /**

     *    设置缓存

     *

     *    @author    Garbin

     *    @param     string $key

     *    @param     mixed  $value

     *    @param     int    $ttl

     *    @return    bool

     */

    function set($key, $value, $ttl = 0){}

    /**

     *    清空缓存

     *

     *    @author    Garbin

     *    @return    bool

     */

    function clear(){}



    /**

     *    删除一个缓存

     *

     *    @author    Garbin

     *    @param     string $key

     *    @return    bool

     */

    function delete($key){}

}



/**

 *    普通PHP文件缓存

 *

 *    @author    Garbin

 *    @usage    none

 */

class PhpCacheServer extends CacheServer

{

    /* 缓存目录 */

    var $_cache_dir = './';

    function set($key, $value, $ttl = 0)

    {

        if (!$key)

        {

            return false;

        }

        $cache_file = $this->_get_cache_path($key);

        $cache_data = "<?php\r\n/**\r\n *  @Created By ECMall PhpCacheServer\r\n *  @Time:" . date('Y-m-d H:i:s') . "\r\n */";

        $cache_data .= $this->_get_expire_condition(intval($ttl));

        $cache_data .= "\r\nreturn " . var_export($value, true) .  ";\r\n";

        $cache_data .= "\r\n?>";



        return file_put_contents($cache_file, $cache_data, LOCK_EX);

    }

    function &get($key)

    {

        $cache_file = $this->_get_cache_path($key);

        if (!is_file($cache_file))

        {

            return false;

        }

        $data = include($cache_file);



        return $data;

    }

    function clear()

    {

        $dir = dir($this->_cache_dir);

        while (false !== ($item = $dir->read()))

        {

            if ($item == '.' || $item == '..' || substr($item, 0, 1) == '.')

            {

                continue;

            }

            $item_path = $this->_cache_dir . '/' . $item;

            if (is_dir($item_path))

            {

                ecm_rmdir($item_path);

            }

            else

            {

                @unlink($item_path);

            }

        }



        return true;

    }

    function delete($key)

    {

        $cache_file = $this->_get_cache_path($key);



        return @unlink($cache_file);

    }

    function set_cache_dir($path)

    {

        $this->_cache_dir = $path;

    }

    function _get_expire_condition($ttl = 0)

    {

        if (!$ttl)

        {

            return '';

        }



        return "\r\n\r\n" . 'if(filemtime(__FILE__) + ' . $ttl . ' < time())return false;' . "\r\n";

    }

    function _get_cache_path($key)

    {

        return $this->_cache_dir . '/' . $this->_get_file_name($key);

    }

    function _get_file_name($key)

    {

        return md5($key) . '.cache.php';

    }

}



/**

 *    Memcached

 *

 *    @author    Garbin

 *    @usage    none

 */

class MemcacheServer extends CacheServer

{

    var $_memcache = null;

    function __construct($options)

    {

        $this->MemcacheServer($options);

    }

    function MemcacheServer($options)

    {

        parent::__construct($options);



        /* 连接到缓存服务器 */

        $this->connect($this->_options);

    }



    /**

     *    连接到缓存服务器

     *

     *    @author    Garbin

     *    @param     array $options

     *    @return    bool

     */

    function connect($options)

    {

        if (empty($options))

        {

            return false;

        }

        $this->_memcache = new Memcache;



        return $this->_memcache->connect($options['host'], $options['port']);

    }



    /**

     *    写入缓存

     *

     *    @author    Garbin

     *    @param    none

     *    @return    void

     */

    function set($key, $value, $ttl = null)

    {

        return $this->_memcache->set($key, $value, $ttl);

    }



    /**

     *    获取缓存

     *

     *    @author    Garbin

     *    @param     string $key

     *    @return    mixed

     */

    function &get($key)

    {

        return $this->_memcache->get($key);

    }



    /**

     *    清空缓存

     *

     *    @author    Garbin

     *    @return    bool

     */

    function clear()

    {

        return $this->_memcache->flush();

    }



    function delete($key)

    {

        return $this->_memcache->delete($key);

    }

}



?>