lock.lock();
        try {
            return idleTimer.getElapsedMillis() / 1000.0 / 60.0;
        } finally {
            lock.unlock();
        }
    }

    public long getIdleMillis() {
        if (state == State.Idle) {
            return idleTimer.getElapsedMillis();
        } else {
            return 0L;
        }
    }

    boolean isWillRefuseNewCommands() {