}

    /**
     * Finalizes and removes the preauth integrity context for a session.
     *
     * @param sessionId the session identifier
     */
    public void finalizeSession(String sessionId) {
        PreauthIntegrityContext context = sessionContexts.remove(sessionId);
        if (context != null) {
            context.invalidate();

                    throw new DictionaryException("Failed to write: " + item, e);
                }
            }
            return null;
        }

        /**
         * Closes the updater and finalizes the file update operation.
         * If changes were committed, the temporary file replaces the original.
         * Otherwise, the temporary file is deleted.
         */
        @Override
        public void close() {

        score += localInterface.getScore() / 100;
        score += remoteInterface.getScore() / 100;

        // Prefer primary channel slightly
        if (isPrimary)
            score += 10;

        // Penalize channels with many pending operations
        score -= (int) getRequestsPending();

        return Math.max(0, score);
    }

    @Override
    public String toString() {