Netty IdleStateHandler出现问题-我是否以错误的方式对其进行了测试? [英] Trouble with Netty IdleStateHandler - am I testing it the wrong way?
问题描述
我有一个玩具Netty服务器,当客户的频道未发生任何事件时,我正尝试向他们发送心跳消息.我正在通过远程登录服务器,编写消息然后不发送任何内容来对此进行测试,但是我听不到任何声音!
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
您错过了将HeartbeatHandler添加到ChannelPipeline中的操作.您需要将IdleStateHandler AND HeartbeatHandler添加到ChannelPipeline才能使其正常工作.
You missed to add the HeartbeatHandler in the ChannelPipeline. You need to add IdleStateHandler AND HeartbeatHandler to the ChannelPipeline to have it work.
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