值选项模式
最后更新于：2022-04-02 02:35:39
[TOC]
## 值选项模式
> [参考](https://segmentfault.com/a/1190000013653494)
main.go
```
type IComponent interface {
Mount(...IComponent)
Remove(IComponent)
Do(ctx context.Context) error
SubDo(ctx context.Context) error
}
type BaseComponent struct {
Components []IComponent
}
func (b *BaseComponent) Mount(component ...IComponent) {
for _, v := range component {
b.Components = append(b.Components, v)
}
}
func (b *BaseComponent) Remove(component IComponent) {
for k, v := range b.Components {
if v == component {
fmt.Printf("move %+v\n", reflect.TypeOf(v))
b.Components = append(b.Components[:k], b.Components[k+1:]...)
}
}
}
func (b *BaseComponent) Do(ctx context.Context) (err error) {
// code
return
}
func (b *BaseComponent) SubDo(ctx context.Context) error {
for _, v := range b.Components {
if err := v.Do(ctx); err != nil {
return err
}
}
return nil
}
type All struct {
BaseComponent
}
func (a *All) Do(ctx context.Context) (err error) {
fmt.Printf("%+v\n", runFuncName())
return a.SubDo(ctx)
}
type A1 struct {
BaseComponent
}
func (a *A1) Do(ctx context.Context) (err error) {
fmt.Printf("%+v\n", runFuncName())
return a.SubDo(ctx)
}
type A12 struct {
BaseComponent
}
func (a *A12) Do(ctx context.Context) (err error) {
fmt.Printf("%+v\n", runFuncName())
return a.SubDo(ctx)
}
type A11 struct {
BaseComponent
}
func (a *A11) Do(ctx context.Context) (err error) {
fmt.Printf("%+v\n", runFuncName())
return a.SubDo(ctx)
}
type B1 struct {
BaseComponent
}
func (a *B1) Do(ctx context.Context) (err error) {
fmt.Printf("%+v\n", runFuncName())
return a.SubDo(ctx)
}
type C1 struct {
BaseComponent
}
func (a *C1) Do(ctx context.Context) (err error) {
fmt.Printf("%+v\n", runFuncName())
return a.SubDo(ctx)
}
func main() {
// 初始化订单结算页面 这个大组件
all := &All{}
a1 := &A1{}
a1.Mount(&A11{}, &A12{})
b1 := &B1{}
all.Mount(a1, b1, &C1{})
// 只能删除本身的子组件
all.Remove(b1)
// 开始构建页面组件数据
ctx := context.WithValue(context.Background(), "a", "b")
all.SubDo(ctx)
//output
//move *main.B1
//main.(*A1).Do
//main.(*A11).Do
//main.(*A12).Do
//main.(*C1).Do
}
// 获取正在运行的函数名
func runFuncName() string {
pc := make([]uintptr, 1)
runtime.Callers(2, pc)
f := runtime.FuncForPC(pc[0])
return f.Name()
}
```
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