Netty源码解析与剖析入门课程

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资源摘要信息:"Netty源码剖析简介" Netty是一个高性能的网络应用程序框架,它简化了网络编程,使得快速开发可扩展的网络服务器和客户端变得容易。Netty被广泛应用于大型分布式系统,如物联网、游戏服务器、大数据处理等领域的后端服务器开发。本资源文件主要针对Netty的源码进行深入剖析,试图帮助开发者理解和掌握Netty框架内部工作机制以及代码实现的精妙之处。 Netty框架提供了以下几个核心组件和概念: 1. **Channel(通道)**:通道是网络通信的主体,它代表了一个连接。Netty的Channel接口定义了许多与I/O操作和事件处理相关的方法。在Netty中,一个连接对应一个Channel实例。 2. **EventLoop(事件循环)**:事件循环是Netty实现异步非阻塞的核心组件,它处理通道的I/O操作。EventLoop负责监听和处理事件,比如连接、读写、心跳等,保证了事件的及时处理和高效的资源分配。 3. **ChannelPipeline(通道管道)**:通道管道是处理网络事件的拦截处理器链。当一个事件被触发时,它会在管道中传播,由不同的Handler进行相应的处理。 4. **ChannelHandler(通道处理器)**:通道处理器是处理通道事件的接口。在Netty中,自定义的业务逻辑处理器需要继承ChannelHandler,通过重写其方法来实现具体逻辑。 5. **ByteBuf(字节缓冲区)**:Netty使用ByteBuf作为其主要的字节序列容器,它比传统的java.io.ByteBuffer更灵活、性能更优越,支持引用计数、自动扩容等。 6. **BootStrap(引导)**:BootStrap是Netty用于配置和初始化Channel的工具类。在服务器端,ServerBootStrap用于设置服务器参数,并帮助Channel监听端口;在客户端,BootStrap用于建立与服务器的连接。 7. **Future和Promise(未来和承诺)**:在Netty中,Future用来表示异步操作的结果,Promise可以视为Future的一个特例,它不仅可以返回结果,还可以主动设置结果。 8. **Netty的零拷贝**:Netty实现了高效的零拷贝机制,减少不必要的数据复制,优化I/O操作的性能。Netty的零拷贝特性包括了内存映射文件、CompositeByteBuf、slice和直接内存的使用等技术。 9. **TCP参数优化**:Netty提供了丰富的TCP参数设置,包括TCP_NODELAY(禁用Nagle算法)、SO_BACKLOG(连接队列大小)、SO_RCVBUF和SO_SNDBUF(接收和发送缓冲区大小)等。 本资源的压缩包中的课时文件"课时02:Netty源码剖析简介.avi",可能包含如下内容: - Netty的设计哲学和核心架构分析。 - Netty的源码结构和关键模块的详细解读。 - Netty的组件如何协同工作,实现高效网络通信的原理。 - Netty的异常处理机制和资源回收策略。 - Netty的并发模型和内存管理机制。 - Netty在实际项目中的应用案例和最佳实践。 通过对这些资源的学习,开发者不仅能够深入理解Netty的内部实现,还可以在实际工作中更高效地利用Netty解决网络编程中遇到的问题,设计出更为稳定和高性能的应用程序。

com.fmall58.wechatsub.business.bizs.UException at com.fmall58.wechatsub.business.service.PubService.isBindWeChatSub(PubService.java:76) at com.fmall58.wechatsub.business.bizs.PubHelper.isBindWeChatSub(PubHelper.java:125) at com.fmall58.wechatsub.business.bizs.PubHelper.execute(PubHelper.java:38) at com.fmall58.wechatsub.server.handlers.ServerHandler.channelRead(ServerHandler.java:103) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:323) at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:297) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340) at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348) at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965) at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163) at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:656) at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:591) at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:508) at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:470) at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:909) at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)

2023-06-11 上传

2023-07-13 09:15:56,872 WARN org.apache.flink.runtime.dispatcher.DispatcherRestEndpoint [] - Unhandled exception java.io.IOException: Connection reset by peer at sun.nio.ch.FileDispatcherImpl.read0(Native Method) ~[?:1.8.0_372] at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:39) ~[?:1.8.0_372] at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223) ~[?:1.8.0_372] at sun.nio.ch.IOUtil.read(IOUtil.java:192) ~[?:1.8.0_372] at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:379) ~[?:1.8.0_372] at org.apache.flink.shaded.netty4.io.netty.buffer.PooledByteBuf.setBytes(PooledByteBuf.java:253) ~[flink-dist-1.15.3.jar:1.15.3] at org.apache.flink.shaded.netty4.io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:1132) ~[flink-dist-1.15.3.jar:1.15.3] at org.apache.flink.shaded.netty4.io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:350) ~[flink-dist-1.15.3.jar:1.15.3] at org.apache.flink.shaded.netty4.io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:151) [flink-dist-1.15.3.jar:1.15.3] at org.apache.flink.shaded.netty4.io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:719) [flink-dist-1.15.3.jar:1.15.3] at org.apache.flink.shaded.netty4.io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:655) [flink-dist-1.15.3.jar:1.15.3] at org.apache.flink.shaded.netty4.io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:581) [flink-dist-1.15.3.jar:1.15.3] at org.apache.flink.shaded.netty4.io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493) [flink-dist-1.15.3.jar:1.15.3] at org.apache.flink.shaded.netty4.io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986) [flink-dist-1.15.3.jar:1.15.3] at org.apache.flink.shaded.netty4.io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) [flink-dist-1.15.3.jar:1.15.3] at java.lang.Thread.run(Thread.java:750) [?:1.8.0_372]

2023-07-14 上传
2023-06-07 上传

2023-07-14 15:19:01.215 WARN 7308 --- [sson-netty-2-15] io.netty.util.concurrent.DefaultPromise : An exception was thrown by org.redisson.misc.RedissonPromise$$Lambda$888/0x00000008008f7440.operationComplete() java.lang.NullPointerException: null 2023-07-14 15:19:01.216 ERROR 7308 --- [sson-netty-2-15] o.r.c.SentinelConnectionManager : Can't execute SENTINEL commands on /172.24.107.11:26379 org.redisson.client.RedisException: ERR No such master with that name. channel: [id: 0x2d66827d, L:/172.23.9.103:46812 - R:/172.24.107.11:26379] command: (SENTINEL SLAVES), params: [mymaster] at org.redisson.client.handler.CommandDecoder.decode(CommandDecoder.java:365) ~[redisson-3.13.3.jar:3.13.3] at org.redisson.client.handler.CommandDecoder.decodeCommand(CommandDecoder.java:196) ~[redisson-3.13.3.jar:3.13.3] at org.redisson.client.handler.CommandDecoder.decode(CommandDecoder.java:134) ~[redisson-3.13.3.jar:3.13.3] at org.redisson.client.handler.CommandDecoder.decode(CommandDecoder.java:104) ~[redisson-3.13.3.jar:3.13.3] at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:501) ~[netty-codec-4.1.51.Final.jar:4.1.51.Final] at io.netty.handler.codec.ReplayingDecoder.callDecode(ReplayingDecoder.java:366) ~[netty-codec-4.1.51.Final.jar:4.1.51.Final] at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276) ~[netty-codec-4.1.51.Final.jar:4.1.51.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final] at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final] at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final] at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final] at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:714) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final] at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:650) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final] at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:576) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final] at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493) ~[netty-transport-4.1.51.Final.jar:4.1.51.Final] at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989) ~[netty-common-4.1.51.Final.jar:4.1.51.Final] at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.51.Final.jar:4.1.51.Final] at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[netty-common-4.1.51.Final.jar:4.1.51.Final] at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na] 解决方法

2023-07-15 上传

Caused by: io.netty.channel.AbstractChannel$AnnotatedConnectException: 拒绝连接: node01/192.168.72.110:7077 Caused by: java.net.ConnectException: 拒绝连接 at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:715) at io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:330) at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:334) at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:702) at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:650) at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:576) at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493) at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989) at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) at java.lang.Thread.run(Thread.java:748) 23/07/07 22:44:06 ERROR StandaloneSchedulerBackend: Application has been killed. Reason: All masters are unresponsive! Giving up. 23/07/07 22:44:06 WARN StandaloneSchedulerBackend: Application ID is not initialized yet. 23/07/07 22:44:06 INFO Utils: Successfully started service 'org.apache.spark.network.netty.NettyBlockTransferService' on port 45096. 23/07/07 22:44:06 INFO NettyBlockTransferService: Server created on node01:45096 23/07/07 22:44:06 INFO BlockManager: Using org.apache.spark.storage.RandomBlockReplicationPolicy for block replication policy 23/07/07 22:44:06 INFO SparkUI: Stopped Spark web UI at http://node01:4040 23/07/07 22:44:06 INFO BlockManagerMaster: Registering BlockManager BlockManagerId(driver, node01, 45096, None) 23/07/07 22:44:06 INFO StandaloneSchedulerBackend: Shutting down all executors

2023-07-11 上传