class MessageManager
{
    private Message lastMessage = null;

    void send(Message m)
    {
        try
        {
            Network.sendMessage(m);
            lastMessage = null;
        }
        catch(IOException e)
        {
            lastMessage = m;
        }
    }

    void run()
    {
        if (lastMessage != null)
        {
            send(lastMessage);
            if (lastMessage != null)
                return;
        }

        while (Network.hasMessageAvailable())
        {
            send(Network.readNextMessage());
            if (lastMessage != null)
                return;
        }
    }
}