Netty IdleStateHandler的麻烦 - 我是以错误的方式测试的吗？

Question

我有一个玩具Netty服务器,我试图在他们的频道上没有发生任何事情时向客户发送心跳消息.我通过telnet到服务器,写一条消息然后不发送任何东西来测试这个,但我没有听到任何声音!

安慰:

>>telnet localhost 6969
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
>>foo
Did you say 'foo'?

MyPipelineFactory.java

public class MyPipelineFactory implements ChannelPipelineFactory {
    private final Timer timer;
    private static final ChannelHandler stringDecoder = new StringDecoder();
    private static final ChannelHandler stringEncoder = new StringEncoder();
    private final ChannelHandler idleStateHandler;

    public MyPipelineFactory(Timer t) {
        this.timer = t;
        this.idleStateHandler = new IdleStateHandler(timer, 5, 5, 5);
    }

    public ChannelPipeline getPipeline() {
        // create default pipeline from static method
        ChannelPipeline pipeline = Channels.pipeline();
        pipeline.addLast("idleStateHandler", this.idleStateHandler); // heartbeat
        pipeline.addLast("framer", new DelimiterBasedFrameDecoder(1024, Delimiters.lineDelimiter()));
        //pipeline.addLast("frameDecoder", new LengthFieldBasedFrameDecoder(1024,0,1)); // get header from message
        pipeline.addLast("stringDecoder", stringDecoder);
        pipeline.addLast("stringEncoder", stringEncoder);
        pipeline.addLast("ServerHandler", new ServerHandler()); // goes at the end

        return pipeline;
    }
}

HeartbeatHandler.java

public class HeartbeatHandler extends IdleStateAwareChannelHandler {

    @Override
    public void channelIdle(ChannelHandlerContext ctx, IdleStateEvent e) {
        if (e.getState() == IdleState.READER_IDLE) {
            System.out.println("Reader idle, closing channel");
            //e.getChannel().close();
            e.getChannel().write("heartbeat-reader_idle");
        }
        else if (e.getState() == IdleState.WRITER_IDLE) {
            System.out.println("Writer idle, sending heartbeat");
            e.getChannel().write("heartbeat-writer_idle");
        }
        else if (e.getState() == IdleState.ALL_IDLE) {
            System.out.println("All idle, sending heartbeat");
            e.getChannel().write("heartbeat-all_idle");
        }
    }
}

---

固定:

我忘了拥有HeartbeatHandler,它需要IdleStateHandler(这部分对我来说并不明显).这样可行.

public class MyPipelineFactory implements ChannelPipelineFactory {
    private final Timer timer;
    private static final ChannelHandler stringDecoder = new StringDecoder();
    private static final ChannelHandler stringEncoder = new StringEncoder();
    private final ChannelHandler idleStateHandler;
    private final ChannelHandler heartbeatHandler;

    public MyPipelineFactory(Timer t) {
        this.timer = t;
        this.idleStateHandler = new IdleStateHandler(timer, 5, 5, 5);
        this.heartbeatHandler = new HeartbeatHandler();
    }

    public ChannelPipeline getPipeline() {
        // create default pipeline from static method
        ChannelPipeline pipeline = Channels.pipeline();
        pipeline.addLast("idleStateHandler", this.idleStateHandler);
        pipeline.addLast("heartbeatHandler", this.heartbeatHandler); // heartbeat
        pipeline.addLast("framer", new DelimiterBasedFrameDecoder(1024, Delimiters.lineDelimiter()));
        //pipeline.addLast("frameDecoder", new LengthFieldBasedFrameDecoder(1024,0,1)); // get header from message
        pipeline.addLast("stringDecoder", stringDecoder);
        pipeline.addLast("stringEncoder", stringEncoder);
        pipeline.addLast("ServerHandler", new ServerHandler()); // goes at the end

        return pipeline;
    }
}

Answer 1

您错过了在ChannelPipeline中添加HeartbeatHandler.您需要将IdleStateHandler 和 HeartbeatHandler 添加到ChannelPipeline才能使其正常工作.