[Proposal] Add aliases to the interface(Serivce) by adding annotations to simplify development

[photowey]

At present, if you want to declare a specific implementation of an interface, you have to write a long fully qualified package name, which is very cumbersome. for example:

+ioc:autowire:implements=github.com/alibaba/ioc-golang/example/autowire/autowire_active_profile_implements/service.Service

// +ioc:autowire=true
// +ioc:autowire:type=singleton
// +ioc:autowire:implements=github.com/alibaba/ioc-golang/example/autowire/autowire_active_profile_implements/service.Service

type serviceDefaultImpl struct {
}

func (s *serviceDefaultImpl) GetHelloString(name string) string {
	return fmt.Sprintf("This is serviceDefaultImpl, hello %s", name)
}

It is expected that aliases are added to interfaces through annotations, and then development is simplified by specifying aliases directly where needed.

Among them, it should be noted that:

• Aliases are globally unique
• When parsing aliases through CLI and then initiating alias registration, you need to pay attention to the timing of registration and use (sequence)

---

The effect achieved is as follows:

// +ioc:autowire:service:alias=HelloService
type Service interface {
	GetHelloString(string) string
}

// Notes:
// HelloService == github.com/alibaba/ioc-golang/example/autowire/autowire_active_profile_implements/service.Service

// +ioc:autowire=true
// +ioc:autowire:type=singleton
// +ioc:autowire:implements=HelloService
type serviceDefaultImpl struct {
}

func (s *serviceDefaultImpl) GetHelloString(name string) string {
	return fmt.Sprintf("This is serviceDefaultImpl, hello %s", name)
}

// alias == "HelloService"

[LaurenceLiZhixin]

Thanks for your proposal @photowey , I have a question that, can we change ioc:autowire:service:alias to ioc:autowire:alias ? Like struct alias that already supported?

[photowey]

I think this is achievable, however, there are a few things to keep in mind:

• Are aliases for interfaces and aliases for instances allowed to be duplicated?

• How to distinguish whether an alias is an interface alias or an instance alias?

Suggest:

When registering an interface(Service) alias, we can add a special token, such as: "&"

  // +ioc:autowire:alias=HelloService
  type Service interface {
  	GetHelloString(string) string
  }
  
  // HelloService == github.com/alibaba/ioc-golang/example/autowire/autowire_active_profile_implements/service.Service
  
  // aliasMap
  // aliasMap["&HelloService"] = github.com/alibaba/ioc-golang/example/autowire/autowire_active_profile_implements/service.Service
  
  // Notes:
  // KEYs starting with "&" default to the KEY of the interface alias

  // +ioc:autowire=true
  // +ioc:autowire:type=singleton
  // +ioc:autowire:alias=HelloService
  type ServiceImpl interface {
  
  }
  
  func(impl *ServiceImpl)GetHelloString(string) string {
      
  }
  
  // aliasMap
  // aliasMap["HelloService"] = github.com/alibaba/ioc-golang/example/autowire/autowire_active_profile_implements/service.ServiceImpl

[LaurenceLiZhixin]

I think it's ok to add a special token to interface alias @photowey