Netty ClientBootstrap重新连接到另一台服务器

Question

我有一个关于ClientBootstrap的问题。下面是场景；

null

    @Override
public void messageReceived(ChannelHandlerContext ctx, MessageEvent e)throws Exception  {
    if(e.getMessage() instanceof SomePacket){
    ....
    }else if(e.getMessage() instanceof Reconnect){ //Server_A has sent a RECONNECT Message.(Redirection)
        Reconnect theReconnectPacket = (Reconnect)e.getMessage();
        String hostname = theReconnectPacket.getHostname();
        int port = theReconnectPacket.getPort();

        this.reconnectHost  = hostname;
    this.reconnectPort  = port;
    this.currentState   = 1;

    ctx.getChannel().disconnect();    //DISCONNECT FROM SERVER_A

     }
}

@Override
public void channelDisconnected(ChannelHandlerContext ctx,ChannelStateEvent e) throws Exception {

     if(this.currentState == 1){

        Channel disconnectedChannel = ctx.getChannel();

    if (!disconnectedChannel.isConnected()){

    SocketAddress destinationAddress = new InetSocketAddress(this.reconnectHost, this.reconnectPort);
           //TRYING TO RECONNECT SERVER_B
    disconnectedChannel.connect(destinationAddress);    //**Error Line:java.nio.channels.ClosedChannelException**

    }

      }


    super.channelDisconnected(ctx, e);
}

正如您在错误行中看到的，我得到了这个异常：java.nio.channels.ClosedChannelException。我们不能在断开后使用相同的频道吗？。一旦断开，就完成了吗？。我们如何在SimpleChannelHandler中重新创建连接？

感谢进一步的评论：）

<<<<<<新方法>>>>>

在SimpleChannledHandler中，我使用ClientBootStrap连接一个不同的端口。

 @Override
public void channelDisconnected(ChannelHandlerContext ctx,ChannelStateEvent e) throws Exception {

       Channel disconnectedChannel = ctx.getChannel();
    final ClientDataObject oldObject = ClientDataState.clientObject.get(disconnectedChannel);

    if(oldObject.getClientState() == 1){

        if (!disconnectedChannel.isConnected()){

SocketAddress destinationAddress = new InetSocketAddress(this.reconnectHost, this.reconnectPort);

ChannelFuture connectFuture = bootstrap.connect(destinationAddress);

connectFuture.addListener(new ChannelFutureListener() {
    @Override
    public void operationComplete(ChannelFuture channelFuture) throws Exception {

        Channel newChannel = channelFuture.getChannel();
    ClientDataObject newObject =  ClientDataState.clientObject.get(newChannel);
                      newObject.setClientID(oldObject.getClientID());


                     newObject.setClientState(oldObject.getClientState());
                    newObject.setRoomId(oldObject.getRoomId());
                    newObject.setClientState(1);

                    ClientDataState.clientObject.set(newChannel, newObject);

                    Channels.write(newChannel, new Login(newObject.getClientID()));
               }});             

        }else{
                     //Channled connected
            }

    }

    super.channelDisconnected(ctx, e);

}

处理这个问题的方法我们应该这样实现ChannelPipelineFactory吗？

   public class GameClientPipelineFactory implements ChannelPipelineFactory{

      private static final ClientStaticHandler SHARED = new ClientStaticHandler();  

           private Someobject o;
public GameClientPipelineFactory(Someobject refTOSomeObject) {
    super();
    this.o = refToSomeObject;
}

@Override
public ChannelPipeline getPipeline() throws Exception {
    // TODO Auto-generated method stub
    ChannelPipeline pipeline = Channels.pipeline();

    //pipeline.addLast("delimiter", new DelimiterBasedFrameDecoder(256, Delimiters.lineDelimiter()));
    pipeline.addLast("decoder", new GameClientDecoder());
    pipeline.addLast("encoder", new GameClientEncoder());
    pipeline.addLast("shared", SHARED); //I added this line

    pipeline.addLast("logicHandler", new GameClientLogicHandler(this.o));

    return pipeline;

}

但我该如何使用这个“共享”处理程序呢？每次当我需要一个全局对象时，我是否应该请求管道来获得这个处理程序，并从“共享”处理程序中获得任何对象？这不是很远吗？

Answer 1

与其尝试重新打开已关闭的通道，不如尝试创建一个新通道。

您可能希望实现一个回调来启动新通道的创建。