/
type_builder.go
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/
type_builder.go
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// MIT License
//
// Copyright (c) 2021 Xiantu Li
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package json
import (
"fmt"
"reflect"
"sync"
"unsafe"
)
// 构造器
type TypeBuilder struct {
// 用于存储属性字段
fields []reflect.StructField
Type reflect.Type
lazyOffsets []*uintptr
goType *GoType
size int
pool sync.Pool
}
func NewTypeBuilder() *TypeBuilder {
return &TypeBuilder{}
}
// 根据预先添加的字段构建出结构体
func (b *TypeBuilder) New() unsafe.Pointer {
v := reflect.New(b.Type)
p := reflectValueToPointer(&v)
return p
}
// 根据预先添加的字段构建出结构体
func (b *TypeBuilder) NewSlice() unsafe.Pointer {
p := unsafe_NewArray(b.goType, 1024)
return p
}
func (b *TypeBuilder) Interface() interface{} {
v := reflect.New(b.Type)
return v.Interface()
}
func (b *TypeBuilder) PInterface() (unsafe.Pointer, interface{}) {
v := reflect.New(b.Type)
return reflectValueToPointer(&v), v.Interface()
}
// 根据预先添加的字段构建出结构体
func (b *TypeBuilder) Build() reflect.Type {
if len(b.fields) == 0 {
return nil
}
typ := b.Type
if b.Type == nil {
typ = reflect.StructOf(b.fields)
b.Type = typ
b.goType = UnpackType(typ)
}
for i := 0; i < typ.NumField(); i++ {
if len(b.lazyOffsets) > i && b.lazyOffsets[i] != nil {
*b.lazyOffsets[i] = typ.Field(i).Offset
}
}
return typ
}
//Init 调用 Build() 并初始化缓存
func (b *TypeBuilder) Init() {
b.Build()
// 处理缓存
if len(b.fields) == 0 {
return
}
goType := b.goType
b.size = int(goType.Size)
N := (8 * 1024 / b.size) + 1
l := N * b.size
b.pool.New = func() any {
// reflect.MakeSlice()
ps := unsafe_NewArray(goType, N)
pH := &SliceHeader{
Data: ps,
Len: l,
Cap: l,
}
return (*[]uint8)(unsafe.Pointer(pH))
}
}
// TODO: 此处也可以使用 NewBatch 来提高性能? 提升 10ns ?
func (b *TypeBuilder) NewFromPool() unsafe.Pointer {
if len(b.fields) == 0 {
return nil
}
s := b.pool.Get().(*[]uint8)
pp := unsafe.Pointer(&(*s)[0])
if cap(*s) >= b.size*2 {
*s = (*s)[b.size:]
b.pool.Put(s)
}
return pp
}
/*
针对 slice,要添加一个 [4]type 的空间作为预分配的资源
*/
func (b *TypeBuilder) AppendTagField(typ reflect.Type, lazyOffset *uintptr) *TypeBuilder {
name := fmt.Sprintf("F_%d", len(b.fields))
b.fields = append(b.fields, reflect.StructField{Name: name, Type: typ})
b.lazyOffsets = append(b.lazyOffsets, lazyOffset)
return b
}
func (b *TypeBuilder) AppendField(name string, typ reflect.Type, lazyOffset *uintptr) *TypeBuilder {
b.fields = append(b.fields, reflect.StructField{Name: name, Type: typ})
b.lazyOffsets = append(b.lazyOffsets, lazyOffset)
return b
}
func (b *TypeBuilder) AppendPointer(name string, lazyOffset *uintptr) *TypeBuilder {
var p unsafe.Pointer
return b.AppendField(name, reflect.TypeOf(p), lazyOffset)
}
func (b *TypeBuilder) AppendIntSlice(name string, lazyOffset *uintptr) *TypeBuilder {
var s []int
return b.AppendField(name, reflect.TypeOf(s), lazyOffset)
}
func (b *TypeBuilder) AppendString(name string, lazyOffset *uintptr) *TypeBuilder {
return b.AppendField(name, reflect.TypeOf(""), lazyOffset)
}
func (b *TypeBuilder) AppendBool(name string, lazyOffset *uintptr) *TypeBuilder {
return b.AppendField(name, reflect.TypeOf(true), lazyOffset)
}
func (b *TypeBuilder) AppendInt64(name string, lazyOffset *uintptr) *TypeBuilder {
return b.AppendField(name, reflect.TypeOf(int64(0)), lazyOffset)
}
func (b *TypeBuilder) AppendFloat64(name string, lazyOffset *uintptr) *TypeBuilder {
return b.AppendField(name, reflect.TypeOf(float64(1.2)), lazyOffset)
}
// 添加字段
func (b *TypeBuilder) AddField(field string, typ reflect.Type) *TypeBuilder {
b.fields = append(b.fields, reflect.StructField{Name: field, Type: typ})
return b
}
func (b *TypeBuilder) AddString(name string) *TypeBuilder {
return b.AddField(name, reflect.TypeOf(""))
}
func (b *TypeBuilder) AddBool(name string) *TypeBuilder {
return b.AddField(name, reflect.TypeOf(true))
}
func (b *TypeBuilder) AddInt64(name string) *TypeBuilder {
return b.AddField(name, reflect.TypeOf(int64(0)))
}
func (b *TypeBuilder) AddFloat64(name string) *TypeBuilder {
return b.AddField(name, reflect.TypeOf(float64(1.2)))
}
func main() {
b := NewTypeBuilder().
AddString("Name").
AddInt64("Age")
p := b.New()
i := b.Interface()
pp := reflect.ValueOf(i).Elem().Addr().Interface()
fmt.Printf("typ:%T, value:%+v, ponter1:%d,ponter1:%v\n", p, i, p, pp)
}