dubbo 架构设计图

图内说明来源：dubbo 官网
http://dubbo.apache.org/zh-cn/docs/dev/design.html

dubbo Framework Design.jpg

Graphviz dot 源码
dubbo Framework Design.dot

digraph G{
// 设置字体防止乱码
fontname = "Microsoft YaHei"
// 默认方形
node [shape = "record", fontname = "Microsoft YaHei"]
// 默认空箭头
edge [fontname = "Microsoft YaHei"]

legend [label="{ (图例) 名称
| 说明
| 中心
| 拓展接口}"]

label="dubbo"

proxy -> cluster -> protocol -> exchange

subgraph cluster_remoting {
    label="remoting"
    exchange -> transport -> serialize
}

{
    rank = same
    config proxy
}

{
    rank = same
    registry cluster
}

{
    rank = same
    monitor protocol
}

config [label="{config 配置层
| 对外配置接口
| ServiceConfig, ReferenceConfig
| }"]

proxy [label="{proxy 服务代理层
| 服务接口透明代理，接口 Invoker 转换
| ServiceProxy
| ProxyFactory}"]

registry [label="{registry 注册中心层
| 封装服务地址的注册与发现
| URL
| RegistryFactory, Registry, RegistryService}"]

cluster [label="{cluster 路由层
| 封装多个提供者的路由及负载均衡，并桥接注册中心
| Invoker
| Cluster, Directory, Router, LoadBalance}"]

monitor [label="{monitor 监控层
| RPC 调用次数和调用时间监控
| Statistics
| MonitorFactory, Monitor, MonitorService}"]

protocol [label="{protocol 远程调用层
| 封装 RPC 调用
| Invocation, Result
| Protocol, Invoker, Exporter}" fillcolor="#FFD9CA" style=filled]

exchange [label="{exchange 信息交换层
| 封装请求响应模式，同步转异步
| Request, Response
| Exchanger, ExchangeChannel, ExchangeClient, ExchangeServer}"]

transport [label="{transport 网络传输层
| 抽象 mina 和 netty 为统一接口
| Message
| Channel, Transporter, Client, Server, Codec}"]

serialize [label="{serialize 数据序列化层
| 可复用的一些工具
|
| Serialization, ObjectInput, ObjectOutput, ThreadPool}"]

}

生成图片脚本
dubbo Framework Design.bat

echo off
SET dot=dot
if exist "C:\Program Files (x86)\Graphviz2.38\bin\dot.exe" (
    SET dot="C:\Program Files (x86)\Graphviz2.38\bin\dot.exe"
) else if exist "D:\Program Files (x86)\Graphviz2.38\bin\dot.exe" (
    SET dot="D:\Program Files (x86)\Graphviz2.38\bin\dot.exe"
)
if exist "%~n0.dot" (
    SET file=%~n0.dot
) else if exist "%~n0.gv" (
    SET file=%~n0.gv
)
%dot% "%file%" -Tsvg -o "%~n0.svg" || (
    echo need install Graphviz
    echo https://graphviz.gitlab.io/_pages/Download/Download_windows.html
    pause
    exit
)
%dot% "%file%" -Tjpg -o "%~n0.jpg"

PS：之前面试阿里没过，向面试官请教时他告诉我可以自己写个“简易dubbo”。
最近写了下，思路其实很简单，首先远程调用，所以要在服务端调起方法，调方法时反射需要接口名、方法名、参数类型、参数、那么把这些传过去就可以了，写完后果然有了更好的理解。