本文介绍了Netty IdleStateHandler 出现问题 - 我是否以错误的方式测试它?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我有一个玩具 Netty 服务器,当他们的频道没有发生任何事情时,我正在尝试向客户端发送心跳消息.我正在通过 telnet 到服务器进行测试,写一条消息然后不发送任何东西,但我没有听到任何声音!

I have a toy Netty server and am trying to send heartbeat messages to clients when nothing has happened on their channels. I am testing this by telnetting to the server, writing a message and then not sending anything, but I get no hearbeat!

控制台:

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

MyPipelineFactory.java

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

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");
        }
    }
}

已修复:


Fixed:

我忘记了 HeartbeatHandler,它需要 IdleStateHandler(这部分对我来说并不明显).那行得通.

I forgot to have the HeartbeatHandler, which requires the IdleStateHandler (this part wasn't obvious to me). That works.

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;
    }
}

推荐答案

您没有在 ChannelPipeline 中添加 HeartbeatHandler.您需要将 IdleStateHandler AND HeartbeatHandler 添加到 ChannelPipeline 以使其工作.

You missed to add the HeartbeatHandler in the ChannelPipeline. You need to add IdleStateHandler AND HeartbeatHandler to the ChannelPipeline to have it work.

这篇关于Netty IdleStateHandler 出现问题 - 我是否以错误的方式测试它?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

05-18 15:05