实现依赖注入demo
使用 ioc-golang 实现依赖注入demo
教程
我们将开发一个具有以下拓扑的工程，在本例子中，可以展示代码生成、接口注入、对象指针注入、API 获取对象能力。
用户所需编写的全部代码：main.go
package main
import (
"fmt"
"github.com/alibaba/ioc-golang"
"github.com/alibaba/ioc-golang/autowire/singleton"
)
// +ioc:autowire=true
// +ioc:autowire:type=singleton
type App struct {
ServiceImpl1 Service `singleton:"ServiceImpl1"` // 要求注入Service 的 ServiceImpl1 实现
ServiceImpl2 Service `singleton:"ServiceImpl2"` // 要求注入Service 的 ServiceImpl2 实现
ServiceStruct *ServiceStruct `singleton:"ServiceStruct"` // 要求注入 ServiceStruct 指针
}
func (a*App) Run(){
a.ServiceImpl1.Hello()
a.ServiceImpl2.Hello()
a.ServiceStruct.Hello()
}
type Service interface{
Hello()
}
// +ioc:autowire=true
// +ioc:autowire:type=singleton
// +ioc:autowire:interface=Service
type ServiceImpl1 struct {
}
func (s *ServiceImpl1) Hello(){
fmt.Println("This is ServiceImpl1, hello world")
}
// +ioc:autowire=true
// +ioc:autowire:type=singleton
// +ioc:autowire:interface=Service
type ServiceImpl2 struct {
}
func (s *ServiceImpl2) Hello(){
fmt.Println("This is ServiceImpl2, hello world")
}
// +ioc:autowire=true
// +ioc:autowire:type=singleton
type ServiceStruct struct {
}
func (s *ServiceStruct) Hello(){
fmt.Println("This is ServiceStruct, hello world")
}
func main(){
// 框架启动
if err := ioc.Load(); err != nil{
panic(err)
}
// App-App 即结构ID： '$(接口名)-$(结构名)'， 对于结构指针，接口名默认为结构名
// 可通过这一 ID 获取实例
appInterface, err := singleton.GetImpl("App-App")
if err != nil{
panic(err)
}
app := appInterface.(*App)
app.Run()
}
编写完毕后，当前目录命令行执行（mac 环境可能因为权限原因需要sudo）：
sudo ioc-go-cli gen
会在当前目录生成：zz_generated.ioc.go，开发者无需关心这一文件，该文件包含了所有接口的描述信息，
//go:build !ignore_autogenerated
// +build !ignore_autogenerated
// Code generated by ioc-go-cli
package main
import (
"github.com/alibaba/ioc-golang/autowire"
"github.com/alibaba/ioc-golang/autowire/singleton"
)
func init() {
singleton.RegisterStructDescriptor(&autowire.StructDescriptor{
Interface: &App{},
Factory: func() interface{} {
return &App{}
},
})
singleton.RegisterStructDescriptor(&autowire.StructDescriptor{
Interface: new(Service),
Factory: func() interface{} {
return &ServiceImpl1{}
},
})
singleton.RegisterStructDescriptor(&autowire.StructDescriptor{
Interface: new(Service),
Factory: func() interface{} {
return &ServiceImpl2{}
},
})
singleton.RegisterStructDescriptor(&autowire.StructDescriptor{
Interface: &ServiceStruct{},
Factory: func() interface{} {
return &ServiceStruct{}
},
})
}
初始化 go mod ，执行
% go mod init ioc-golang-demo
% go mod tidy
% tree
.
├── go.mod
├── go.sum
├── main.go
└── zz_generated.ioc.go
执行程序：
go run .
控制台打印输出：
___ ___ ____ ____ _
|_ _| / _ \ / ___| / ___| ___ | | __ _ _ __ __ _
| | | | | | | | _____ | | _ / _ \ | | / _` | | '_ \ / _` |
| | | |_| | | |___ |_____| | |_| | | (_) | | | | (_| | | | | | | (_| |
|___| \___/ \____| \____| \___/ |_| \__,_| |_| |_| \__, |
|___/
Welcome to use ioc-golang!
[Boot] Start to load ioc-golang config
[Config] Load config file from ../conf/ioc_golang.yaml
Load ioc_golang config file failed. open ../conf/ioc_golang.yaml: no such file or directory
The load procedure is continue
[Boot] Start to load debug
[Debug] Debug mod is not enabled
[Boot] Start to load autowire
[Autowire Type] Found registered autowire type singleton
[Autowire Struct Descriptor] Found type singleton registered SD App-App
[Autowire Struct Descriptor] Found type singleton registered SD Service-ServiceImpl1
[Autowire Struct Descriptor] Found type singleton registered SD Service-ServiceImpl2
[Autowire Struct Descriptor] Found type singleton registered SD ServiceStruct-ServiceStruct
This is ServiceImpl1, hello world
This is ServiceImpl2, hello world
This is ServiceStruct, hello world
可看到，注入成功，程序正常运行。
更多
您可以参阅 示例 查阅更多例子和框架高级用法
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Last modified May 19, 2022: Fix: update docs (75dddd7)