Netty连接超时处理方法

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以下处理方法都是基于netty3.5.13版本。

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官方给出的处理方法：

// An example that sends a ping message when there is no outbound traffic
 // for 30 seconds.  The connection is closed when there is no inbound traffic
 // for 60 seconds.

 public class MyPipelineFactory implements ChannelPipelineFactory {

     private final Timer timer;
     private final ChannelHandler idleStateHandler;

     public MyPipelineFactory(Timer timer) {
         this.timer = timer;
         this.idleStateHandler = new IdleStateHandler(timer, 60, 30, 0), // timer must be shared.
     }

     public ChannelPipeline getPipeline() {
         return Channels.pipeline(
             idleStateHandler,
             new MyHandler());
     }
 }

 // Handler should handle the IdleStateEvent triggered by IdleStateHandler.
 public class MyHandler extends IdleStateAwareChannelHandler {

     @Override
     public void channelIdle(ChannelHandlerContext ctx, IdleStateEvent e) {
         if (e.getState() == IdleState.READER_IDLE) {
             e.getChannel().close();
         } else if (e.getState() == IdleState.WRITER_IDLE) {
             e.getChannel().write(new PingMessage());
         }
     }
 }

 ServerBootstrap bootstrap = ...;
 Timer timer = new HashedWheelTimer();
 ...
 bootstrap.setPipelineFactory(new MyPipelineFactory(timer));

需要注意的两点：

1、IdleStateHandler构造函数参数含义

   构造函数体


   public IdleStateHandler(Timer timer,
                        int readerIdleTimeSeconds,
                        int writerIdleTimeSeconds,
                        int allIdleTimeSeconds)

      这里的timer是org.jboss.netty.util.Timer，而不是java.util.Timer

   readerIdleTimeSeconds、固定时间（单位为秒）检测一下是否有接收到消息。指定0时，禁用

      writerIdleTimeSeconds、固定时间（单位为秒）写一次消息。指定0时，禁用

allIdleTimeSeconds、无论是读还是写都在指定时间内进行。指定0时，禁用

2、pipeline在执行事件回调的时候，是后进先出规则的，所有在加载idleStathandler和MyHandler一定要注意顺序

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