Jetserver开源项目学习（七）—— ChannelFutureListener的用法

用法一：给通道添加异步接口

public void close()
    {
        LOG.debug("Going to close tcp connection in class: {}", this
                .getClass().getName());
        Event event = Events.event(null, Events.DISCONNECT);
        if (channel.isConnected())
        {
            channel.write(event).addListener(ChannelFutureListener.CLOSE);
        }
        else
        {
            channel.close();
            LOG.trace("Unable to write the Event {} with type {} to socket",
                    event, event.getType());
        }
    }

public void handleGameRoomJoin(Player player, Channel channel, String refKey)
    {
        GameRoom gameRoom = lookupService.gameRoomLookup(refKey);
        if (null != gameRoom)
        {
            PlayerSession playerSession = gameRoom.createPlayerSession(player);
            gameRoom.onLogin(playerSession);
            String reconnectKey = (String)idGeneratorService
                    .generateFor(playerSession.getClass());
            playerSession.setAttribute(JetConfig.RECONNECT_KEY, reconnectKey);
            playerSession.setAttribute(JetConfig.RECONNECT_REGISTRY, reconnectRegistry);
            LOG.trace("Sending GAME_ROOM_JOIN_SUCCESS to channel {}",
                    channel.getId());
            ChannelFuture future = channel.write(eventToFrame(
                    Events.GAME_ROOM_JOIN_SUCCESS, reconnectKey));
            connectToGameRoom(gameRoom, playerSession, future);
        }
        else
        {
            // Write failure and close channel.
            ChannelFuture future = channel.write(eventToFrame(
                    Events.GAME_ROOM_JOIN_FAILURE, null));
            future.addListener(ChannelFutureListener.CLOSE);
            LOG.error(
                    "Invalid ref key provided by client: {}. Channel {} will be closed",
                    refKey, channel.getId());
        }
    }

public void connectToGameRoom(final GameRoom gameRoom,
            final PlayerSession playerSession, ChannelFuture future)
    {
        future.addListener(new ChannelFutureListener()
        {
            @Override
            public void operationComplete(ChannelFuture future)
                    throws Exception
            {
                Channel channel = future.getChannel();
                LOG.trace(
                        "Sending GAME_ROOM_JOIN_SUCCESS to channel {} completed",
                        channel.getId());
                if (future.isSuccess())
                {
                    // Set the tcp channel on the session.
                    NettyTCPMessageSender sender = new NettyTCPMessageSender(
                            channel);
                    playerSession.setTcpSender(sender);
                    // Connect the pipeline to the game room.
                    gameRoom.connectSession(playerSession);
                    // Send the connect event so that it will in turn send the
                    // START event.
                    playerSession.onEvent(Events.connectEvent(sender));
                }
                else
                {
                    LOG.error("Sending GAME_ROOM_JOIN_SUCCESS message to client was failure, channel will be closed");
                    channel.close();
                }
            }
        });
    }