ObjectCacheSessionHandler.php

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<?php
class ObjectCacheSessionHandler {
        static function install() {
                session_set_save_handler(
                        array( __CLASS__, 'open' ),
                        array( __CLASS__, 'close' ),
                        array( __CLASS__, 'read' ),
                        array( __CLASS__, 'write' ),
                        array( __CLASS__, 'destroy' ),
                        array( __CLASS__, 'gc' ) );

                // It's necessary to register a shutdown function to call session_write_close(),
                // because by the time the request shutdown function for the session module is
                // called, $wgMemc has already been destroyed. Shutdown functions registered
                // this way are called before object destruction.
                register_shutdown_function( array( __CLASS__, 'handleShutdown' ) );
        }

        static function getCache() {
                global $wgSessionCacheType;
                return ObjectCache::getInstance( $wgSessionCacheType );
        }

        static function getKey( $id ) {
                return wfMemcKey( 'session', $id );
        }

        static function open( $save_path, $session_name ) {
                return true;
        }

        static function close() {
                return true;
        }

        static function read( $id ) {
                $data = self::getCache()->get( self::getKey( $id ) );
                if( $data === false ) {
                        return '';
                }
                return $data;
        }

        static function write( $id, $data ) {
                global $wgObjectCacheSessionExpiry;
                self::getCache()->set( self::getKey( $id ), $data, $wgObjectCacheSessionExpiry );
                return true;
        }

        static function destroy( $id ) {
                self::getCache()->delete( self::getKey( $id ) );
                return true;
        }

        static function gc( $maxlifetime ) {
                return true;
        }

        static function handleShutdown() {
                session_write_close();
        }
}