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尚硅谷 Netty 核心技术及源码剖析

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第 1 章 NETTY 介绍和应用场景....................................................................................................................................................................... 1

1.1 本课程学习要求........................................................................................................................................................................................... 1

1.2 NETTY 的介绍.................................................................................................................................................................................................1

1.3 NETTY 的应用场景........................................................................................................................................................................................ 2

1.3.1 互联网行业............................................................................................................................................................................2

1.3.2 游戏行业................................................................................................................................................................................2

1.3.3 大数据领域............................................................................................................................................................................3

1.3.4 其它开源项目使用到 Netty..................................................................................................................................................4

1.4 NETTY 的学习参考资料................................................................................................................................................................................ 4

第 2 章 JAVA BIO 编程.......................................................................................................................................................................................6

2.1 I/O 模型..........................................................................................................................................................................................................6

2.1.1 I/O 模型基本说明................................................................................................................................................................. 6

2.2 BIO、NIO、AIO 适用场景分析..................................................................................................................................................................7

2.3 JAVA BIO 基本介绍.......................................................................................................................................................................................8

2.4 JAVA BIO 工作机制.......................................................................................................................................................................................8

2.5 JAVA BIO 应用实例.......................................................................................................................................................................................9

2.6 JAVA BIO 问题分析.....................................................................................................................................................................................12

第 3 章 JAVA NIO 编程.....................................................................................................................................................................................14

3.1 JAVA NIO 基本介绍.................................................................................................................................................................................... 14

3.2 NIO 和 BIO 的比较..................................................................................................................................................................................16

3.3 NIO 三大核心原理示意图.........................................................................................................................................................................16

3.3.1 Selector 、 Channel 和 Buffer 的关系图(简单版).........................................................................................................16

3.4 缓冲区(BUFFER)..........................................................................................................................................................................................17

3.4.1 基本介绍..............................................................................................................................................................................17

3.4.2 Buffer 类及其子类.............................................................................................................................................................. 18

3.4.3 ByteBuffer.............................................................................................................................................................................19

3.5 通道(CHANNEL)...........................................................................................................................................................................................20

3.6 基本介绍..................................................................................................................................................................................................... 20

3.6.1 FileChannel 类..................................................................................................................................................................... 21

3.6.2 应用实例 1-本地文件写数据............................................................................................................................................. 21

3.6.3 应用实例 2-本地文件读数据............................................................................................................................................. 23

3.6.4 应用实例 3-使用一个 Buffer 完成文件读取、写入.........................................................................................................25

3.6.5 应用实例 4-拷贝文件 transferFrom 方法......................................................................................................................... 27

3.6.6 关于 Buffer 和 Channel 的注意事项和细节....................................................................................................................28

3.7 SELECTOR(选择器)....................................................................................................................................................................................... 35

3.7.1 基本介绍..............................................................................................................................................................................36

3.7.2 Selector 示意图和特点说明.................................................................................................................................................36

尚硅谷 Netty 核心技术及源码剖析

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3.7.3 Selector 类相关方法.............................................................................................................................................................37

3.7.4 注意事项..............................................................................................................................................................................37

3.8 NIO 非阻塞网络编程原理分析图...........................................................................................................................................................38

3.9 NIO 非阻塞网络编程快速入门...............................................................................................................................................................39

3.10 SELECTIONKEY........................................................................................................................................................................................... 44

3.11 SERVERSOCKETCHANNEL........................................................................................................................................................................... 45

3.12 SOCKETCHANNEL....................................................................................................................................................................................... 45

3.13 NIO 网络编程应用实例-群聊系统......................................................................................................................................................... 46

3.14 NIO 与零拷贝............................................................................................................................................................................................58

3.14.1 零拷贝基本介绍................................................................................................................................................................58

3.14.2 传统 IO 数据读写..............................................................................................................................................................58

3.14.3 传统 IO 模型.....................................................................................................................................................................59

3.14.4 mmap 优化.........................................................................................................................................................................59

3.14.5 sendFile 优化..................................................................................................................................................................... 60

3.14.6 零拷贝的再次理解............................................................................................................................................................62

3.14.7 mmap 和 sendFile 的区别...............................................................................................................................................62

3.14.8 NIO 零拷贝案例................................................................................................................................................................63

3.15 JAVA AIO 基本介绍...................................................................................................................................................................................66

3.16 BIO、NIO、AIO 对比表..........................................................................................................................................................................67

第 4 章 NETTY 概述.........................................................................................................................................................................................68

4.1 原生 NIO 存在的问题................................................................................................................................................................................68

4.2 NETTY 官网说明.......................................................................................................................................................................................... 68

4.3 NETTY 的优点.............................................................................................................................................................................................. 69

4.4 NETTY 版本说明.......................................................................................................................................................................................... 69

第 5 章 NETTY 高性能架构设计.................................................................................................................................................................... 71

5.1 线程模型基本介绍.....................................................................................................................................................................................71

5.2 传统阻塞 I/O 服务模型............................................................................................................................................................................71

5.2.1 工作原理图..........................................................................................................................................................................71

5.2.2 模型特点..............................................................................................................................................................................71

5.2.3 问题分析..............................................................................................................................................................................72

5.3 REACTOR 模式.............................................................................................................................................................................................72

5.3.1 针对传统阻塞 I/O 服务模型的 2 个缺点，解决方案： ...........................................................................................72

5.3.2 I/O 复用结合线程池，就是 Reactor 模式基本设计思想，如图.................................................................................. 73

5.3.3 Reactor 模式中核心组成：.............................................................................................................................................. 74

5.3.4 Reactor 模式分类：............................................................................................................................................................ 74

5.4 单 REACTOR 单线程..................................................................................................................................................................................74

5.4.1 方案说明：..........................................................................................................................................................................75

尚硅谷 Netty 核心技术及源码剖析

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5.4.2 方案优缺点分析：..............................................................................................................................................................76

5.5 单 REACTOR 多线程....................................................................................................................................................................................76

5.5.1 原理图..................................................................................................................................................................................76

5.5.2 对上图的小结......................................................................................................................................................................77

5.5.3 方案优缺点分析：..............................................................................................................................................................78

5.6 主从 REACTOR 多线程..............................................................................................................................................................................78

5.6.1 工作原理图..........................................................................................................................................................................78

5.6.2 上图的方案说明..................................................................................................................................................................79

5.6.3 Scalable IO in Java 对 Multiple Reactors 的原理图解：................................................................................................ 80

5.6.4 方案优缺点说明：..............................................................................................................................................................80

5.7 REACTOR 模式小结.....................................................................................................................................................................................80

5.7.1 3 种模式用生活案例来理解 .............................................................................................................................................80

5.7.2 Reactor 模式具有如下的优点： ...................................................................................................................................... 81

5.8 NETTY 模型...................................................................................................................................................................................................81

5.8.1 工作原理示意图 1-简单版................................................................................................................................................. 81

5.8.2 对上图说明..........................................................................................................................................................................82

5.8.3 工作原理示意图 2-进阶版................................................................................................................................................. 82

5.8.4 工作原理示意图-详细版.................................................................................................................................................... 82

5.8.5 对上图的说明小结..............................................................................................................................................................83

5.8.6 Netty 快速入门实例-TCP 服务...........................................................................................................................................84

5.8.7 任务队列中的 Task 有 3 种典型使用场景....................................................................................................................92

5.8.8 方案再说明..........................................................................................................................................................................97

5.9 异步模型..................................................................................................................................................................................................... 98

5.9.1 基本介绍..............................................................................................................................................................................98

5.9.2 Future 说明.......................................................................................................................................................................... 98

5.9.3 工作原理示意图..................................................................................................................................................................98

5.9.4 Future-Listener 机制............................................................................................................................................................99

5.10 快速入门实例-HTTP 服务.....................................................................................................................................................................101

第 6 章 NETTY 核心模块组件...................................................................................................................................................................... 107

6.1 BOOTSTRAP、SERVERBOOTSTRAP..............................................................................................................................................................107

6.2 FUTURE、CHANNELFUTURE.......................................................................................................................................................................107

6.3 CHANNEL.................................................................................................................................................................................................... 108

6.4 SELECTOR....................................................................................................................................................................................................108

6.5 CHANNELHANDLER 及其实现类.............................................................................................................................................................. 109

6.6 PIPELINE 和 CHANNELPIPELINE............................................................................................................................................................... 110

6.7 CHANNELHANDLERCONTEXT..................................................................................................................................................................... 111

6.8 CHANNELOPTION........................................................................................................................................................................................ 112

6.9 EVENTLOOPGROUP 和其实现类 NIOEVENTLOOPGROUP........................................................................................................................112

尚硅谷 Netty 核心技术及源码剖析

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6.10 UNPOOLED 类.......................................................................................................................................................................................... 113

6.11 NETTY 应用实例-群聊系统..................................................................................................................................................................... 117

6.12 NETTY 心跳检测机制案例...................................................................................................................................................................... 127

6.13 NETTY 通过 WEBSOCKET 编程实现服务器和客户端长连接.............................................................................................................. 132

第 7 章 GOOGLE PROTOBUF..................................................................................................................................................................... 141

7.1 编码和解码的基本介绍...........................................................................................................................................................................141

7.2 NETTY 本身的编码解码的机制和问题分析...........................................................................................................................................141

7.3 PROTOBUF................................................................................................................................................................................................... 142

7.4 PROTOBUF 快速入门实例.......................................................................................................................................................................... 143

7.5 PROTOBUF 快速入门实例 2....................................................................................................................................................................... 144

第 8 章 NETTY 编解码器和 HANDLER 的调用机制.................................................................................................................................147

8.1 基本说明................................................................................................................................................................................................... 147

8.2 编码解码器............................................................................................................................................................................................... 147

8.3 解码器-BYTETOMESSAGEDECODER.........................................................................................................................................................148

8.4 NETTY 的 HANDLER 链的调用机制........................................................................................................................................................... 149

8.5 解码器-REPLAYINGDECODER....................................................................................................................................................................151

8.6 其它编解码器........................................................................................................................................................................................... 152

8.6.1 其它解码器........................................................................................................................................................................152

8.6.2 其它编码器........................................................................................................................................................................152

8.7 LOG4J 整合到 NETTY................................................................................................................................................................................153

第 9 章 TCP 粘包和拆包及解决方案..........................................................................................................................................................156

9.1 TCP 粘包和拆包基本介绍.......................................................................................................................................................................156

9.2 TCP 粘包和拆包现象实例.......................................................................................................................................................................157

9.3 TCP 粘包和拆包解决方案.......................................................................................................................................................................160

9.4 看一个具体的实例:..................................................................................................................................................................................161

第 10 章 NETTY 核心源码剖析.................................................................................................................................................................... 169

10.1 基本说明................................................................................................................................................................................................. 169

10.2 NETTY 启动过程源码剖析..................................................................................................................................................................... 169

10.2.1 源码剖析目的..................................................................................................................................................................169

10.2.2 源码剖析..........................................................................................................................................................................169

10.2.3 源码剖析过程..................................................................................................................................................................170

10.2.4 Netty 启动过程梳理.........................................................................................................................................................190

10.3 NETTY 接受请求过程源码剖析............................................................................................................................................................. 190

10.3.1 源码剖析目的..................................................................................................................................................................191

10.3.2 源码剖析..........................................................................................................................................................................191

10.3.3 Netty 接受请求过程梳理.................................................................................................................................................199

尚硅谷 Netty 核心技术及源码剖析

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10.4 PIPELINE HANDLER HANDLERCONTEXT 创建源码剖析......................................................................................................................... 199

10.4.1 源码剖析目的..................................................................................................................................................................200

10.4.2 源码剖析说明..................................................................................................................................................................200

10.4.3 源码剖析..........................................................................................................................................................................200

10.4.4 Pipeline Handler HandlerContext 创建过程梳理............................................................................................................214

10.5 CHANNELPIPELINE 调度 HANDLER 的源码剖析.................................................................................................................................. 214

10.5.1 源码剖析目的..................................................................................................................................................................214

10.5.2 源码剖析..........................................................................................................................................................................214

10.5.3 ChannelPipeline 调度 handler 梳理.............................................................................................................................. 220

10.6 NETTY 心跳(HEARTBEAT)服务源码剖析............................................................................................................................................... 221

10.6.1 源码剖析目的..................................................................................................................................................................221

10.6.2 源码剖析..........................................................................................................................................................................221

10.7 NETTY 核心组件 EVENTLOOP 源码剖析..............................................................................................................................................231

10.7.1 源码剖析目的..................................................................................................................................................................231

10.7.2 源码剖析..........................................................................................................................................................................231

10.8 HANDLER 中加入线程池和 CONTEXT 中添加线程池的源码剖析......................................................................................................245

10.8.1 源码剖析目的..................................................................................................................................................................245

10.8.2 源码剖析..........................................................................................................................................................................245

第 11 章用 NETTY 自己实现 DUBBO RPC............................................................................................................................................252

11.1 RPC 基本介绍..........................................................................................................................................................................................252

11.2 RPC 调用流程图......................................................................................................................................................................................253

11.3 PRC 调用流程说明..................................................................................................................................................................................253

11.4 自己实现 DUBBO RPC(基于 NETTY).....................................................................................................................................................254

11.4.1 需求说明.......................................................................................................................................................................... 254

11.4.2 设计说明.......................................................................................................................................................................... 254

11.4.3 代码实现.......................................................................................................................................................................... 255