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injects.go
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injects.go
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package inject
import (
"fmt"
"log"
"reflect"
)
//依赖注入
type injector struct {
services []interface{}
}
func (i *injector) injectOne(v interface{}, deps []reflect.Value) {
vrf := reflect.ValueOf(v)
trf := vrf.Type()
if vrf.Kind() != reflect.Ptr || vrf.Elem().Kind() != reflect.Struct {
panic(fmt.Sprintf("type of %s must be *struct ", trf.String()))
}
switch vrf.Kind() {
case reflect.Ptr:
vrf = vrf.Elem()
fallthrough
case reflect.Struct:
tp := vrf.Type()
for i := 0; i < vrf.NumField(); i++ {
vfi := vrf.Field(i)
switch vfi.Kind() {
case reflect.Interface:
t := vfi.Type()
for _, dep := range deps {
if dep.Type().Implements(t) && !IsNil(dep){
vfi.Set(dep)
log.Println("inject:", tp.Name(),"->", tp.Field(i).Name, "by", dep.String())
break
}
}
case reflect.Ptr:
if vfi.IsNil() {
t := vfi.Type()
for _, dep := range deps {
depT := dep.Type()
if depT == t {
vfi.Set(dep)
log.Println("inject:", tp.Name(),"->", tp.Field(i).Name, "by", dep.String())
break
}
}
}
}
}
}
}
func (i *injector) doInject(dependencies []interface{}) {
rvs := make([]reflect.Value, len(dependencies))
for i, _ := range rvs {
rvs[i] = reflect.ValueOf(dependencies[i])
}
for _, service := range i.services {
i.injectOne(service, rvs)
}
i.check()
}
// 将依赖注入到services 中
func Inject(services []interface{}, deps []interface{}) {
ij := &injector{services: services}
ij.doInject(deps)
}
func InjectOne(service interface{},deps []interface{}){
ij := &injector{[]interface{}{service}}
ij.doInject(deps)
}
func (i *injector) check() {
for _, service := range i.services {
sv := reflect.ValueOf(service)
sv = sv.Elem()
tp := sv.Type()
for i := 0; i < sv.NumField(); i++ {
fv := sv.Field(i)
switch fv.Kind() {
case reflect.Ptr,reflect.Interface:
if fv.IsNil() {
panic("value is nil after injection:" + tp.Name()+"."+tp.Field(i).Name)
}
}
}
}
}
func IsNil(v reflect.Value)bool{
switch v.Kind() {
case reflect.Ptr,reflect.Map,reflect.Slice,reflect.Interface:
if v.IsNil(){
return true
}
return false
case reflect.Struct:
return false
default:
return false
}
}