netty超时

参考

Netty 超时机制的介绍

Netty 的超时类型 IdleState 主要分为：

  • ALL_IDLE : 一段时间内没有数据接收或者发送
  • READER_IDLE ： 一段时间内没有数据接收
  • WRITER_IDLE ： 一段时间内没有数据发送

在 Netty 的 timeout 包下，主要类有：

  • IdleStateEvent ： 超时的事件

  • IdleStateHandler ： 超时状态处理

  • ReadTimeoutHandler ： 读超时状态处理

  • WriteTimeoutHandler ： 写超时状态处理

    VSEchoServer.java 启动netty

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    package netty;





    public class VSEchoServer {
    	private int port;
    	public VSEchoServer(int port){
    	  this.port = port;
    	}
    	
    	public void do_startServer(){
    	    //System.out.println("do_startServer");
    		new Thread(){
    		  @Override
    		  public void run(){
    			  //System.out.println("start..");
    			  VSEchoServerCls esc = new VSEchoServerCls();
    			  //System.out.println("start..2");
    			  try{
    			     esc.do_start(port);
    			     //System.out.println("start..3");
    			  }catch(Exception e){
    				  
    			  }
    			  //System.out.println("end..");
    		  }
    		}.start();
    	
    	}
    	
    	public static void main(String[] args) throws InterruptedException {
    		
    		new VSEchoServer(8001).do_startServer();
    		
    		
    	}

    }

    VSEchoServerCls.java 启动

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    /*
     * Copyright 2012 The Netty Project
     *
     * The Netty Project licenses this file to you under the Apache License,
     * version 2.0 (the "License"); you may not use this file except in compliance
     * with the License. You may obtain a copy of the License at:
     *
     *   http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
     * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
     * License for the specific language governing permissions and limitations
     * under the License.
     */
    package netty;



    import io.netty.bootstrap.ServerBootstrap;
    import io.netty.channel.ChannelFuture;
    import io.netty.channel.ChannelInitializer;
    import io.netty.channel.ChannelOption;
    import io.netty.channel.ChannelPipeline;
    import io.netty.channel.EventLoopGroup;
    import io.netty.channel.nio.NioEventLoopGroup;
    import io.netty.channel.socket.SocketChannel;
    import io.netty.channel.socket.nio.NioServerSocketChannel;

    import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
    import io.netty.handler.codec.LengthFieldPrepender;
    import io.netty.handler.codec.string.StringDecoder;
    import io.netty.handler.codec.string.StringEncoder;
    import io.netty.handler.logging.LogLevel;
    import io.netty.handler.logging.LoggingHandler;
    import io.netty.handler.ssl.SslContext;
    import io.netty.handler.ssl.SslContextBuilder;
    import io.netty.handler.ssl.util.SelfSignedCertificate;
    import io.netty.util.CharsetUtil;



    /**
     * Echoes back any received data from a client.
     */
      class VSEchoServerCls {

        static final boolean SSL = System.getProperty("ssl") != null;
       
        public static boolean flag=true;
        public  void do_start(int port) throws Exception {
        	 System.out.println("do_start..1");
            // Configure SSL.
            final SslContext sslCtx;
            if (SSL) {
                SelfSignedCertificate ssc = new SelfSignedCertificate();
                sslCtx = SslContextBuilder.forServer(ssc.certificate(), ssc.privateKey()).build();
            } else {
                sslCtx = null;
            }
            //System.out.println("do_start..2");
            // Configure the server.
            EventLoopGroup bossGroup = new NioEventLoopGroup(1);
            EventLoopGroup workerGroup = new NioEventLoopGroup();
            try {
                ServerBootstrap b = new ServerBootstrap();
                b.group(bossGroup, workerGroup)
                 .channel(NioServerSocketChannel.class)
                 .option(ChannelOption.SO_BACKLOG, 100)
                  .handler(new LoggingHandler(LogLevel.INFO)).childHandler(new VSServerInitializer());

                // Start the server.
                ChannelFuture f = b.bind(port).sync();
                
                // Wait until the server socket is closed.
             
                f.channel().closeFuture().sync();
                
            } catch (Exception e) {
    			e.printStackTrace();
    		}
            finally {
                // Shut down all event loops to terminate all threads.
            
                bossGroup.shutdownGracefully();
                workerGroup.shutdownGracefully();
            }
        }
       
    }

VSEchoServerHandler.java

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/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package netty;



import java.text.SimpleDateFormat;
import java.util.Date;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.handler.timeout.IdleState;
import io.netty.handler.timeout.IdleStateEvent;
import io.netty.util.CharsetUtil;

@Sharable
public class VSEchoServerHandler extends ChannelInboundHandlerAdapter {
	private final static SimpleDateFormat sdfTime = new SimpleDateFormat(
			"yyyy-MM-dd HH:mm:ss");
	// Return a unreleasable view on the given ByteBuf
		// which will just ignore release and retain calls.
		private static final ByteBuf HEARTBEAT_SEQUENCE = Unpooled
				.unreleasableBuffer(Unpooled.copiedBuffer("Heartbeat",
						CharsetUtil.UTF_8));  // 1

		@Override
		public void userEventTriggered(ChannelHandlerContext ctx, Object evt)
				throws Exception {
			sendmsg(ctx);	
			if (evt instanceof IdleStateEvent) {  // 2
				IdleStateEvent event = (IdleStateEvent) evt;  
				String type = "";
				if (event.state() == IdleState.READER_IDLE) {
					type = "read idle";
				} else if (event.state() == IdleState.WRITER_IDLE) {
					type = "write idle";
				} else if (event.state() == IdleState.ALL_IDLE) {
					type = "all idle";
				}

				ctx.writeAndFlush(HEARTBEAT_SEQUENCE.duplicate()).addListener(
						ChannelFutureListener.CLOSE_ON_FAILURE);  // 3
	 
				System.out.println( ctx.channel().remoteAddress()+"超时类型：" + type);
				
			} else {
				super.userEventTriggered(ctx, evt);
			}
		}
		//发送消息
		public void sendmsg(ChannelHandlerContext ctx){

			
						System.out.println("测试发送"+sdfTime.format(new Date()));
						try {
							 ctx.writeAndFlush("测试发送"+sdfTime.format(new Date()));
				
							 //pingMessage.release();
							 
						} catch (Exception e) {
							e.printStackTrace();
						}
						
					

		
		}
}

VSServerInitializer.java

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package netty;

 
import java.util.concurrent.TimeUnit;

import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.DelimiterBasedFrameDecoder;
import io.netty.handler.codec.LineBasedFrameDecoder;
import io.netty.handler.codec.http.HttpRequestDecoder;
import io.netty.handler.codec.http.HttpResponseEncoder;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
import io.netty.handler.timeout.IdleStateHandler;

 

 

public class VSServerInitializer extends ChannelInitializer<SocketChannel> { 

    @Override
    protected void initChannel(SocketChannel channel) throws Exception {
        ChannelPipeline pipeline = channel.pipeline();
 
        System.out.println("initChannel:"); 

        
        pipeline.addLast("idleStateHandler", new IdleStateHandler(60,5,30, TimeUnit.SECONDS));//读超时 写超时 写超时
        pipeline.addLast("handler", new VSEchoServerHandler());

        
    }
    

 
}

模拟读超时可以用telnet

netty
netty

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