1.don't create new client bootstrap in the channelActive, create a client
bootstrap at the application level, as same as the server bootstrap;
2.add the SomeOtherHandler to the client bootstrap pipeline;
3.after the client bootstrap connected to the remote server, save the
ChannelHandlerContext in somewhere such as a global object;
4.when you want to send something to the remote server, use the
ChannelHandlerContext you save in the global object
On Wednesday, May 17, 2017 at 11:16:03 PM UTC+8, crunc...@gmail.com wrote:
>
> Looking at Netty in Action and some SO posts, I saw that in order to talk
> to another system, you can use Bootstrap() to create a new client and
> attach it to the current eventLoop. Looking at the proxy example, it's
> done when the initial server is bootstrapped as well. So I tried
>
>
> public void start(final ApplicationContext applicationContext) throws
> Exception {
> NioEventLoopGroup bossGroup = new NioEventLoopGroup(1);
> NioEventLoopGroup workerGroup = new NioEventLoopGroup();
>
> try {
> bootstrap.group(bossGroup,
> workerGroup).channel(NioServerSocketChannel.class)
> .handler(new
> LoggingHandler(LogLevel.INFO)).childHandler(new
> ChannelInitializer<SocketChannel>() {
> @Override
> protected void initChannel(SocketChannel ch)
> throws Exception {
> ch.pipeline().addLast(new ServerHandlerImpl());
> ch.pipeline().addLast(new SomeOtherHandler());
> }
>
> @Override
> protected void channelActive(ChannelHandlerContext
> ctx) throws Exception {
> Bootstrap clientBootstrap = new Bootstrap();
> clientBootstrap.channel(NioSocketChannel.class)
> .handler(new
> ChannelInitializer<SocketChannel>() {
> @Override
> protected void
> initChannel(SocketChannel ch) throws Exception {
> ch.pipeline().addLast(new
> CredentialsClientHandler());
> }
> });
>
> clientBootstrap.group(ctx.channel().eventLoop());
> ChannelFuture future =
> clientBootstrap.connect(host, port);
> }
> });
>
> So when a message comes in and it reaches the ServerHandlerImpl, I want it
> to then route its message to CredentialsClientHandler that would send a
> message to another server, check the credentials, and then resume the rest
> of the pipeline. In ServerHandlerImpl, how do I "send a message" down the
> other handler and not down SomeOtherHandler?
>
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