import net.sf.freecol.common.networking.UpdateServerMessage; //导入依赖的package包/类
/**
 * Send a message to the meta-server.
 *
 * @param type The {@code MetaMessageType} to send.
 * @param si The associated {@code ServerInfo}.
 * @return True if the operation succeeds.
 */
private static boolean metaMessage(MetaMessageType type, ServerInfo si) {
    try (Connection mc = getMetaServerConnection(null)) {
        if (mc == null) return false;
        si.setConnection(mc.getName(), mc.getHostAddress(), mc.getPort());
        switch (type) {
        case REGISTER:
            mc.sendMessage(new RegisterServerMessage(si));
            return startTimer(si);
        case REMOVE:
            mc.sendMessage(new RemoveServerMessage(si));
            return stopTimer(si);
        case UPDATE:
            mc.sendMessage(new UpdateServerMessage(si));
            return updateTimer(si);
        default:
            logger.log(Level.WARNING, "Wrong metaMessage type: " + type);
            return false;
        }
    } catch (Exception ex) {
        logger.log(Level.WARNING, "Meta-server " + type.toString()
            + " failed: " + FreeCol.getMetaServerAddress()
            + ":" + FreeCol.getMetaServerPort(), ex);
    }
    return false;
}
 

import net.sf.freecol.common.networking.UpdateServerMessage; //导入依赖的package包/类
/**
 * {@inheritDoc}
 */
@Override
public Message handle(Connection connection, Message message)
    throws FreeColException {
    if (message == null) return null;
    Message reply = null;
    final String tag = message.getType();
    switch (tag) {
    case DisconnectMessage.TAG:
        disconnect(connection);
        break;
    case RegisterServerMessage.TAG:
        RegisterServerMessage rsm = (RegisterServerMessage)message;
        rsm.setAddress(connection.getHostAddress()); // Trust the connection
        register(rsm);
        break;
    case RemoveServerMessage.TAG:
        remove((RemoveServerMessage)message);
        break;
    case ServerListMessage.TAG:
        reply = serverList();
        break;
    case UpdateServerMessage.TAG:
        UpdateServerMessage usm = (UpdateServerMessage)message;
        usm.setAddress(connection.getHostAddress()); // Trust the connection
        update(usm);
        break;
    default:
        logger.warning("Unknown request: " + tag);
        break;
    }
    return reply;
}
 

import net.sf.freecol.common.networking.UpdateServerMessage; //导入依赖的package包/类
/**
 * Handle an "update"-request.
 * 
 * @param message The {@code UpdateServerMessage} to process.
 */
private void update(UpdateServerMessage message) {
    final ServerInfo si = message.getServerInfo();

    metaRegister.updateServer(si);
}