<?php

/**

 * MyBB 1.6

 * Copyright 2010 MyBB Group, All Rights Reserved

 *

 * Website: http://mybb.com

 * License: http://mybb.com/about/license

 *

 * $Id$

 */



/**

 * Memcache Cache Handler

 */

class memcacheCacheHandler

{

	/**

	 * The memcache server resource

	 */

	public $memcache;



	/**

	 * Unique identifier representing this copy of MyBB

	 */

	public $unique_id;



	function memcacheCacheHandler($silent=false)

	{

		global $mybb;



		if(!function_exists("memcache_connect"))

		{

			// Check if our DB engine is loaded

			if(!extension_loaded("Memcache"))

			{

				// Throw our super awesome cache loading error

				$mybb->trigger_generic_error("memcache_load_error");

				die;

			}

		}

	}



	/**

	 * Connect and initialize this handler.

	 *

	 * @return boolean True if successful, false on failure

	 */

	function connect()

	{

		global $mybb, $error_handler;



		$this->memcache = new Memcache;



		if($mybb->config['memcache']['host'])

		{

			$mybb->config['memcache'][0] = $mybb->config['memcache'];

			unset($mybb->config['memcache']['host']);

			unset($mybb->config['memcache']['port']);

		}



		foreach($mybb->config['memcache'] as $memcache)

		{

			if(!$memcache['host'])

			{

				$message = "Please configure the memcache settings in inc/config.php before attempting to use this cache handler";

				$error_handler->trigger($message, MYBB_CACHEHANDLER_LOAD_ERROR);

				die;

			}



			if(!isset($memcache['port']))

			{

				$memcache['port'] = "11211";

			}



			$this->memcache->addServer($memcache['host'], $memcache['port']);



			if(!$this->memcache)

			{

				$message = "Unable to connect to the memcache server on {$memcache['memcache_host']}:{$memcache['memcache_port']}. Are you sure it is running?";

				$error_handler->trigger($message, MYBB_CACHEHANDLER_LOAD_ERROR);

				die;

			}

		}



		// Set a unique identifier for all queries in case other forums are using the same memcache server

		$this->unique_id = md5(MYBB_ROOT);



		return true;

	}



	/**

	 * Retrieve an item from the cache.

	 *

	 * @param string The name of the cache

	 * @param boolean True if we should do a hard refresh

	 * @return mixed Cache data if successful, false if failure

	 */



	function fetch($name, $hard_refresh=false)

	{

		$data = $this->memcache->get($this->unique_id."_".$name);



		if($data === false)

		{

			return false;

		}

		else

		{

			return $data;

		}

	}



	/**

	 * Write an item to the cache.

	 *

	 * @param string The name of the cache

	 * @param mixed The data to write to the cache item

	 * @return boolean True on success, false on failure

	 */

	function put($name, $contents)

	{

		return $this->memcache->set($this->unique_id."_".$name, $contents);

	}



	/**

	 * Delete a cache

	 *

	 * @param string The name of the cache

	 * @return boolean True on success, false on failure

	 */

	function delete($name)

	{

		return $this->memcache->delete($this->unique_id."_".$name);

	}



	/**

	 * Disconnect from the cache

	 */

	function disconnect()

	{

		@$this->memcache->close();

	}



	function size_of($name)

	{

		global $lang;



		return $lang->na;

	}

}



?>