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();
    }
}