实现依赖注入demo
使用 ioc-golang 实现依赖注入demo
教程
依赖注入和调试教程演示
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
- 注册代码生成
- 接口注入
- 对象指针注入
- API 获取对象
- 调试能力，查看运行中的接口、方法；以及实时监听参数值、返回值。
用户所需编写的全部代码：main.go
package main
import (
"fmt"
"time"
"github.com/alibaba/ioc-golang"
)
// +ioc:autowire=true
// +ioc:autowire:type=singleton
type App struct {
// 将封装了代理层的 main.ServiceImpl1 指针注入到 Service 接口，单例模型，需要在标签中指定被注入结构
ServiceImpl1 Service `singleton:"main.ServiceImpl1"`
// 将封装了代理层的 main.ServiceImpl2 指针注入到 Service 接口，单例模型，需要在标签中指定被注入结构
ServiceImpl2 Service `singleton:"main.ServiceImpl2"`
// 将封装了代理层的 main.ServiceImpl1 指针注入到它的专属接口 'ServiceImpl1IOCInterface'
// 注入专属接口的命名规则是 '${结构名}IOCInterface'，注入专属接口无需指定被注入结构，标签值为空即可。
Service1OwnInterface ServiceImpl1IOCInterface `singleton:""`
// 将结构体指针注入当前字段
ServiceStruct *ServiceStruct `singleton:""`
}
func (a *App) Run() {
for {
time.Sleep(time.Second * 3)
fmt.Println(a.ServiceImpl1.GetHelloString("laurence"))
fmt.Println(a.ServiceImpl2.GetHelloString("laurence"))
fmt.Println(a.Service1OwnInterface.GetHelloString("laurence"))
fmt.Println(a.ServiceStruct.GetString("laurence"))
}
}
type Service interface {
GetHelloString(string) string
}
// +ioc:autowire=true
// +ioc:autowire:type=singleton
type ServiceImpl1 struct {
}
func (s *ServiceImpl1) GetHelloString(name string) string {
return fmt.Sprintf("This is ServiceImpl1, hello %s", name)
}
// +ioc:autowire=true
// +ioc:autowire:type=singleton
type ServiceImpl2 struct {
}
func (s *ServiceImpl2) GetHelloString(name string) string {
return fmt.Sprintf("This is ServiceImpl2, hello %s", name)
}
// +ioc:autowire=true
// +ioc:autowire:type=singleton
type ServiceStruct struct {
}
func (s *ServiceStruct) GetString(name string) string {
return fmt.Sprintf("This is ServiceStruct, hello %s", name)
}
func main() {
// 加载所有结构
if err := ioc.Load(); err != nil {
panic(err)
}
// 获取结构
app, err := GetAppSingleton()
if err != nil {
panic(err)
}
app.Run()
}
上述所说的“代理层”，是框架为“以接口形式注入/获取”的结构体，默认封装的代理，可以扩展一系列运维操作，参考代理对象。我们推荐开发者在编写代码的过程中基于接口编程，则所有对象都可拥有运维能力。
编写完毕后，当前目录执行以下命令，初始化 go mod ，拉取最新代码，生成结构注册代码。（mac 环境可能因权限原因需要sudo）：
% go mod init ioc-golang-demo
% export GOPROXY="https://goproxy.cn"
% go mod tidy
% go get github.com/alibaba/ioc-golang@master
% sudo iocli gen
会在当前目录生成：zz_generated.ioc.go，开发者无需关心这一文件，这一文件中就包含了上面使用的 GetAppSingleton 方法
//go:build !ignore_autogenerated
// +build !ignore_autogenerated
// Code generated by iocli
package main
import (
autowire "github.com/alibaba/ioc-golang/autowire"
normal "github.com/alibaba/ioc-golang/autowire/normal"
"github.com/alibaba/ioc-golang/autowire/singleton"
util "github.com/alibaba/ioc-golang/autowire/util"
)
func init() {
normal.RegisterStructDescriptor(&autowire.StructDescriptor{
Factory: func() interface{} {
return &app_{}
},
})
singleton.RegisterStructDescriptor(&autowire.StructDescriptor{
Factory: func() interface{} {
return &App{}
},
})
...
func GetServiceStructIOCInterface() (ServiceStructIOCInterface, error) {
i, err := singleton.GetImplWithProxy(util.GetSDIDByStructPtr(new(ServiceStruct)), nil)
if err != nil {
return nil, err
}
impl := i.(ServiceStructIOCInterface)
return impl, nil
}
查看当前目录文件
% tree
.
├── go.mod
├── go.sum
├── main.go
└── zz_generated.ioc.go
0 directories, 4 files
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 default config file from ../conf/ioc_golang.yaml
[Config] Load ioc-golang config file failed. open .../Desktop/workplace/alibaba/conf/ioc_golang.yaml: no such file or directory
The load procedure is continue
[Boot] Start to load debug
[Debug] Debug port is set to default :1999
[Boot] Start to load autowire
[Autowire Type] Found registered autowire type normal
[Autowire Struct Descriptor] Found type normal registered SD main.serviceStruct_
[Autowire Struct Descriptor] Found type normal registered SD main.app_
[Autowire Struct Descriptor] Found type normal registered SD main.serviceImpl1_
[Autowire Struct Descriptor] Found type normal registered SD main.serviceImpl2_
[Autowire Type] Found registered autowire type singleton
[Autowire Struct Descriptor] Found type singleton registered SD main.App
[Autowire Struct Descriptor] Found type singleton registered SD main.ServiceImpl1
[Autowire Struct Descriptor] Found type singleton registered SD main.ServiceImpl2
[Autowire Struct Descriptor] Found type singleton registered SD main.ServiceStruct
[Debug] Debug server listening at :1999
This is ServiceImpl1, hello laurence
This is ServiceImpl2, hello laurence
This is ServiceImpl1, hello laurence
This is ServiceStruct, hello laurence
...
可看到，依赖注入成功，程序正常运行。
调试程序
可看到打印出的日志中包含，说明 Debug 服务已经启动。
[Debug] Debug server listening at :1999
新开一个终端，使用 iocli 的调试功能，查看所有拥有代理层的结构和方法。默认端口为 1999。
% iocli list
main.ServiceImpl1
[GetHelloString]
main.ServiceImpl2
[GetHelloString]
监听方法的参数和返回值。以监听 main.ServiceImpl 结构的 GetHelloString 方法为例，每隔三秒钟，函数被调用两次，打印参数和返回值。
% iocli watch main.ServiceImpl1 GetHelloString
========== On Call ==========
main.ServiceImpl1.GetHelloString()
Param 1: (string) (len=8) "laurence"
========== On Response ==========
main.ServiceImpl1.GetHelloString()
Response 1: (string) (len=36) "This is ServiceImpl1, hello laurence"
========== On Call ==========
main.ServiceImpl1.GetHelloString()
Param 1: (string) (len=8) "laurence"
========== On Response ==========
main.ServiceImpl1.GetHelloString()
Response 1: (string) (len=36) "This is ServiceImpl1, hello laurence"
,,,
注解分析
// +ioc:autowire=true
代码生成工具会识别到标有 +ioc:autowire=true 注解的对象
// +ioc:autowire:type=singleton
标记注入模型为 singleton 单例模型，还有 normal 多例模型等扩展
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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February 1, 2023: Update env.md (9848a53)