Question

EventLoopGroup bossGroup = new NioEventLoopGroup(); // (1)
EventLoopGroup workerGroup = new NioEventLoopGroup();
try {
    ServerBootstrap b = new ServerBootstrap(); // (2)
    b.group(bossGroup, workerGroup)
            .channel(NioServerSocketChannel.class) // (3)
            .childHandler(new ChannelInitializer<SocketChannel>() { // (4)
                @Override
                public void initChannel(SocketChannel ch) throws Exception {
                    ch.pipeline().addLast(
                            new 6MessageDecoder(),
                            new LoginHandler());
                }
            })
            .option(ChannelOption.SO_BACKLOG, 128
            )          // (5)
            .childOption(ChannelOption.SO_KEEPALIVE, true); // (6)

    // Bind and start to accept incoming connections.
    ChannelFuture f = b.bind(port).sync(); // (7)

    // Wait until the server socket is closed.
    // In this example, this does not happen, but you can do that to gracefully
    // shut down your server.
    f.channel().closeFuture().sync();
} finally {
    workerGroup.shutdownGracefully();
    bossGroup.shutdownGracefully();
}

我在clojure中写道：

(let [bossGroup (NioEventLoopGroup.)
      workerGroup (NioEventLoopGroup.)
      bootstrap (ServerBootstrap.)]
  (.. bootstrap
      (group bossGroup workerGroup)
      (channel NioServerSocketChannel)
      (childHandler
        (proxy [ChannelInitializer] []
             (initChannel [ch]
               (.. ch
                   (pipeline)
                   (addLast
                     (MessageDecoder.)
                     (LoginHandler.)
                     ))
               )))
      (option ChannelOption/SO_BACKLOG, (int 128))
      (childOption ChannelOption/SO_KEEPALIVE, true)
      (bind (int 8080))
      (sync)
      (channel)
      (closeFuture)
      (sync)
      ;(childHandler (ChannelInitializer<SocketChannel>.))
      )
  )

用clojure编写的代码可以运行，但是当我测试它时：

telnet 127.0.0.1 8080
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
Connection closed by foreign host.

它不起作用。但是，Java代码可以工作。它有什么问题？

Answer 1

有原因：在clojure中，java的变量参数不受支持。（从我的观点来看。）所以，（addlast仅（MessageDecoder。）（LoginHandler。））调用

的语法不正确

addLast(ChannelHandler... handlers) `

netty投诉＆＃34;找不到方法＆＃34;但它捕获异常并使用log4j打印警告。由于未配置log4j，我之前没有看到此警告。

输出：

Escape character is '^]'.

表示绑定和听力有效。

现在它使用了这段代码：

(.addLast
                 (.pipeline ch)
                 (doto (make-array  ChannelHandler 2)
                   (aset 0 (MessageDecoder.))
                   (aset 2 (ServerHandler.))
                   )
                 )

Java和Clojure代码之间的区别是什么？

1 个答案: