Netty 5.0架构解析:从演进到源码深度解读

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"Netty5.0架构剖析和源码解读深入探讨了Java网络编程的进化历程,特别是从传统的BIO通信模型的局限性谈起。在JDK1.4之前的Java Socket通信主要依赖于同步阻塞I/O,导致在高并发场景下性能低下且扩展性受限。BIO模型的问题在于,每个客户端连接都需要一个单独的线程处理,当并发增多时,服务器需要不断扩充硬件资源以应对,这不仅增加了成本,还使得系统维护变得复杂。 Netty 5.0作为业界主流的NIO(Non-blocking I/O)框架,引入了异步IO模型,解决了这些问题。NIO允许服务器在一个单线程或多线程环境中处理多个连接,提高了并发性能。该书详细讲解了如何通过Netty构建服务端和客户端,如ServerBootstrap的使用以及NioServerSocketChannel的注册流程。客户端连接时,通过Bootstrap辅助类进行连接并接收服务端的ACK确认,进一步简化了异步读写操作,如异步消息接收和发送,以及Flush操作的实现。 在架构层面,Netty采用了分层设计,包括逻辑架构,使代码更易于理解和维护。作者李林锋通过源码解析,让读者了解Netty内部的工作原理,如服务端是如何接受新连接、处理请求和响应,以及客户端如何与服务器交互。此外,附录部分提供了作者的个人简介和使用声明,强调了版权归属和文档的使用规范。 阅读这本书,读者不仅可以掌握Netty 5.0的架构和核心组件,还能深入理解其在高效并发网络通信中的关键作用,这对于提升Java网络应用的性能和可扩展性具有重要意义。"
2023-06-12 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