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src/
└── example/
    ├── main.go
    └── adaptor/
        ├── init.go          ← 接口定义 + 注册表
        ├── standard/
        │   └── imports.go   ← 统一导入所有插件
        ├── cls1/
        │   └── base.go      ← 插件 1
        └── cls2/
            └── base.go      ← 插件 2

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package adaptor

type Adaptors interface {
    CreateUser(user string) (bool, error)
    DeleteUser(user string) (bool, error)
    Policies() (bool, error)
}

var FactoryByName = make(map[string]func() Adaptors)

func Register(name string, factory func() Adaptors) {
    FactoryByName[name] = factory
}

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package cls1

import "example/adaptor"

type Cls1 struct{ Name string }

func (g *Cls1) CreateUser(user string) (bool, error) {
    return true, nil
}
func (g *Cls1) DeleteUser(user string) (bool, error) {
    return true, nil
}
func (g *Cls1) Policies() (bool, error) {
    return true, nil
}

// init() 在包被导入时自动执行，将插件注册到全局表
func init() {
    adaptor.Register("Cls1", func() adaptor.Adaptors {
        return new(Cls1)
    })
}

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package standard

import (
    _ "example/adaptor/cls1"
    _ "example/adaptor/cls2"
)

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package main

import (
    _ "example/adaptor/standard" // 触发所有插件的 init()
)

func main() {
    // FactoryByName 中已有 cls1、cls2
    plugin := adaptor.FactoryByName["Cls1"]()
    plugin.CreateUser("test")
}