IO的netty什么都不做编解码器？

Question

我正在编写超文本传输协议-server，它将执行一些非常繁重的计算。我有一些与业务逻辑和阻塞IO相关的编码器-解码器管道。

public void initChannel(Channel ch) { 
    ch.pipeline()
         //All actions in these handlers are very heavy and involve some IO
        .addLast(logicGroup, new HttpRequestDecoder())
        .addLast(logicGroup, new HttpObjectAggregator(Int.MaxValue))
        .addLast(logicGroup, new HttpResponseEncoder())
        .addLast(logicGroup, new ChunkedWriteHandler())
        .addLast(logicGroup, new ResponseBodyDecoder())
        .addLast(logicGroup, new MyBusinessLogic())
}

所以我决定创建另一个工人

EventLoopGroup ioGroup = new NioEventLoopGroup(4)

并在最开始添加简单的处理程序:

.addLast(ioGroup, new ChannelDuplexHandler()) //<---- Only for IO
.addLast(logicGroup, new HttpRequestDecoder())
.addLast(logicGroup, new HttpObjectAggregator(Int.MaxValue))
.addLast(logicGroup, new HttpResponseEncoder())
.addLast(logicGroup, new ChunkedWriteHandler())
.addLast(logicGroup, new ResponseBodyDecoder())
.addLast(logicGroup, new MyBusinessLogic())

在内蒂这样做是不是很通俗？还是有更好的方法？

Answer 1

通常，如果要在 IO 线程上运行处理程序，则在向管道添加处理程序时，您不会指定执行器组。我的建议是将管道构建为：

EventExecutorGroup executorGroup = new DefaultEventExecutorGroup(numberOfThreads);

...

public void initChannel(Channel ch) { 
    ch.pipeline()
      .addLast(new HttpRequestDecoder())
      .addLast(new HttpObjectAggregator(Int.MaxValue))
      .addLast(new HttpResponseEncoder())
      .addLast(new ChunkedWriteHandler())
      .addLast(new ResponseBodyDecoder())
      .addLast(executorGroup, new MyBusinessLogic());
}

这将使您的 MyBusinessLogic 在另一个线程中运行，而不会阻塞 IO 线程。如果你的响应体解码器在cpu/或块上也非常重，你也可以在这里使用执行器组。