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simple-netty-threading-model's Introduction

模仿Netty的NIO实现

这个Demo旨在利用Java原生API模仿 Netty 的NIO线程模型的设计, 以及相关的类架构. 目前只有Acceptor, EventLoop的部分.

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结构讲解

概述

___Acceptor___是用于接收客户连接请求的线程. 在接收到客户端连接后, 将连接注册到单线程EventLoop的selector中. 然后在EventLoop中对于各种异步IO事件进行响应. 响应行为由EventLoop委托ConnectionWrapper执行. 对应关系:

Netty Demo
EventLoop EventLoop
(io.netty.channel)Channel ConnectionWrapper
AbstractUnsafe.outboundBuffer ConnectionWrapper.outbound

EventLoop

每个EventLoop都是单独的一个线程, 在这个线程中, EventLoop负责用Selector轮询可响应的IO事件. Acceptor获取到的客户端连接都由EventLoop管理, 并且一个连接只注册一个EventLoop. 这样这条连接的所有IO事件都会由注册的EventLoop单线程进行处理, 实现了每条连接的IO串行化, 一定程度上减小了编程难度.

ConnectionWrapper

连接包装器将IO操作屏蔽, 便于在EventLoop中调用. 主要是实现read, write等操作. 用专门的容器存储读入或要写出的数据, 在适当的时机进行操作.

inbound & outbound

读入或写出数据的缓存容器, 这里是简单用List存储ByteBuffer. 在Netty中, 借助Netty的ByteBuf, 会有更高效的实现.

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