APC Datastore Class For vBulletin
Posted on February 25th, 2008
On one of my ultra-high traffic web servers, I switched from eAccelerator to APC today (an opcode/caching system for PHP). So far it seems pretty nice… Especially the ability to disable stat for each PHP request.
I ended up making a datastore class for vBulletin also so I could use it for the forum, so if anyone else is using vBulletin on a server with APC, here you go (if you know what this is for, you will know where it goes 
).
// #############################################################################// APC/*** Class for fetching and initializing the vBulletin datastore from APC** @package vBulletin* @version $Revision: 0.0.0.1 $* @date $Date: 2006/05/08 16:51:06 $*/class vB_Datastore_APC extends vB_Datastore{/** * Fetches the contents of the datastore from APC * * @param array Array of items to fetch from the datastore * * @return void */function fetch($itemarray){if(!function_exists(‘apc_fetch’)){trigger_error(‘APC not installed’, E_USER_ERROR);}foreach($this->defaultitemsAS$item){$this->do_fetch($item);}if(is_array($itemarray)){foreach($itemarrayAS$item){$this->do_fetch($item);}}$this->check_options();// set the version number variable$this->registry->versionnumber =& $this->registry->options[‘templateversion’];}/** * Fetches the data from shared memory and detects errors * * @param string title of the datastore item * * @return void */function do_fetch($title){$ptitle = $this->prefix . $title;if(($data = apc_fetch($ptitle)) === false){// appears its not there, lets grab the data and put it in memory$data = ”;if($dataitem = $this->dbobject->query_first(” SELECT title, data FROM “ . TABLE_PREFIX . “datastore WHERE title = ‘” . $this->dbobject->escape_string($title) .“‘”)){$data =& $dataitem[‘data’];}$this->build($title, $data);}$this->register($title, $data);}/** * Updates the appropriate cache file * * @param string title of the datastore item * * @return void */function build($title, $data){$title = $this->prefix . $title;if(!function_exists(‘apc_store’)){trigger_error(‘APC not installed’, E_USER_ERROR);}$check = apc_store($title, $data);}}
Filed under: traffic