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scope.go
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scope.go
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package injector
import (
"fmt"
"reflect"
"strings"
"sync/atomic"
"unsafe"
"github.com/leor-w/utils"
)
type Scope struct {
// name 当前 Scope 的名称
name string
// 存储所有实例的桶
buckets map[reflect.Type]*bucket
// 实例数量
count uint32
// parentScope 当前 Scope 的父 Scope
parentScope *Scope
// childScopes 当前 Scope 的子 Scope
childScopes []*Scope
}
func (scope *Scope) Scope(name string) *Scope {
var child = &Scope{
name: name,
buckets: make(map[reflect.Type]*bucket),
childScopes: make([]*Scope, 0),
}
if scope != nil {
scope.childScopes = append(scope.childScopes, child)
}
child.parentScope = scope
return child
}
// rootScope 返回当前 Scope 的根 Scope
func (scope *Scope) rootScope() *Scope {
if scope.parentScope == nil {
return scope
}
return scope.parentScope.rootScope()
}
func (scope *Scope) getScope(name string) *Scope {
if scope.name == name {
return scope
}
for _, child := range scope.childScopes {
if child.name == name {
return child
}
s := child.getScope(name)
if s != nil {
return s
}
}
return nil
}
func (scope *Scope) Provide(provider IProvider, option ...Option) error {
var options = &Options{}
for _, o := range option {
o(options)
}
return scope.provide(provider, options)
}
func (scope *Scope) provide(provider IProvider, options *Options) error {
e := newEntity(provider, options)
if utils.IsNilPointer(e.instance) {
return fmt.Errorf("container.Provide: 实例为无效的空指针")
}
scope.setValue(e.t, e)
return nil
}
func (scope *Scope) invoke(fn interface{}, options *Options) ([]reflect.Value, error) {
v := reflect.ValueOf(fn)
if v.Kind() != reflect.Func {
return nil, fmt.Errorf("container.Invoke: 必须是一个函数")
}
t := v.Type()
in := make([]reflect.Value, t.NumIn())
for i := 0; i < t.NumIn(); i++ {
it := t.In(i)
e, err := scope.get(it, nil)
if err != nil {
return nil, err
}
if !e.isComplete() {
return nil, fmt.Errorf(InjectionUnfinishedError, it)
}
if !e.v.IsValid() {
return nil, fmt.Errorf(InvalidInjectionFiledError, it, e.alias)
}
in[i] = e.v
}
return v.Call(in), nil
}
func (scope *Scope) getPopulateChan() chan *entity {
popChan := make(chan *entity, scope.count)
for _, bucket := range scope.buckets {
for _, e := range bucket.hasAlias {
popChan <- e
}
for _, e := range bucket.noAlias {
popChan <- e
}
}
return popChan
}
func (scope *Scope) Populate() error {
return scope.populate()
}
// populate 依赖注入
func (scope *Scope) populate() error {
popChan := scope.getPopulateChan()
for {
if len(popChan) == 0 {
break
}
select {
case e := <-popChan:
if err := scope.popEntity(e); err != nil {
return err
}
if !e.isComplete() {
e.printEntityDependy()
popChan <- e
continue
}
default:
break
}
}
if len(scope.childScopes) > 0 {
for _, child := range scope.childScopes {
if err := child.populate(); err != nil {
return fmt.Errorf("[%s] %w", child.name, err)
}
}
}
return nil
}
func (scope *Scope) popEntity(e *entity) error {
v := e.v
for v.Kind() == reflect.Ptr {
v = v.Elem()
}
if v.Kind() != reflect.Struct {
return fmt.Errorf(NonPointerError, v)
}
t := v.Type()
for i := 0; i < v.NumField(); i++ {
f := v.Field(i)
field := t.Field(i)
//if e.isDependency(field) {
// continue
//}
// 检查是否有注入标签
tag, ok := field.Tag.Lookup(injectTag)
if !ok {
continue
}
// 通过注入标签获取对应类型的注入实例
ft := f.Type()
tm := parseTag(tag)
fe, err := scope.get(ft, tm)
if err != nil {
return fmt.Errorf(NotFoundEntityError, v.Type(), ft, scope.name, tm.getAlias())
}
if !fe.v.IsValid() {
return fmt.Errorf(InvalidInjectionFiledError, ft, e.alias)
}
if !f.CanSet() {
f = reflect.NewAt(f.Type(), unsafe.Pointer(f.UnsafeAddr())).Elem()
}
f.Set(fe.v)
e.setDependency(field)
}
return nil
}
func (scope *Scope) getRecursive(t reflect.Type, tm tagMapper) (*entity, error) {
e, err := scope.get(t, tm)
if err != nil || !e.isComplete() || !e.v.IsValid() {
if len(scope.childScopes) <= 0 {
return nil, err
}
for _, child := range scope.childScopes {
e, err = child.getRecursive(t, tm)
if err != nil || e == nil || !e.isComplete() || !e.v.IsValid() {
continue
}
return e, nil
}
}
return e, nil
}
func (scope *Scope) get(t reflect.Type, it tagMapper) (*entity, error) {
tagScope := scope
if it.hasScope() {
tagScope = scope.rootScope().getScope(it.getScope())
}
bt, b, err := tagScope.tryGetBucket(t)
if err != nil || b == nil {
// 找不到到, 检查是否标记为可选 如果是则返回 nil
if strings.Contains(it.getOptional(), TagOptionNotRequired) {
return nil, nil
}
return nil, err
}
if bt != nil {
t = bt
}
// 获取对应的 entity
e := b.get(t, it.getAlias())
if e == nil {
return nil, fmt.Errorf("未找到对应的 entity 类型为: [%v] 别名为: [%s]", t, it.getAlias())
}
return e, nil
}
// tryGetBucket 尝试获取对应的 bucket
func (scope *Scope) tryGetBucket(t reflect.Type) (reflect.Type, *bucket, error) {
// 直接找对应的 bucket
b, exist := scope.buckets[t]
if exist {
return t, b, nil
}
bt, b, err := scope.findAssignableBucket(t)
if err != nil {
return scope.findParentScopeBucket(t)
}
return bt, b, nil
}
// findAssignableBucket 查找可赋值或为接口实现的 bucket
func (scope *Scope) findAssignableBucket(t reflect.Type) (reflect.Type, *bucket, error) {
for k, v := range scope.buckets {
if k.AssignableTo(t) || t.AssignableTo(k) {
return k, v, nil
}
}
return nil, nil, fmt.Errorf(NotFoundBucketError, t)
}
// findParentScopeBucket 从父容器中查找可赋值或为接口实现的 bucket
func (scope *Scope) findParentScopeBucket(t reflect.Type) (reflect.Type, *bucket, error) {
if scope.parentScope == nil {
return nil, nil, fmt.Errorf(NotFoundBucketError, t)
}
pt, pb, _ := scope.parentScope.tryGetBucket(t)
if pb != nil {
if pt != nil {
t = pt
}
return pt, pb, nil
}
return nil, nil, fmt.Errorf(NotFoundBucketError, t)
}
// setValue 设置实例
func (scope *Scope) setValue(k reflect.Type, e *entity) {
bucket, exist := scope.buckets[k]
if !exist {
bucket = newBucket()
scope.buckets[k] = bucket
}
bucket.set(e)
atomic.AddUint32(&scope.count, 1)
}