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singleton.go
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singleton.go
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package factory
import (
"context"
"fmt"
"github.com/expgo/sync"
"reflect"
"strings"
"time"
)
type singleton struct {
once sync.Once
obj any
initFunc func() any
option Option
_name string
lock sync.Mutex
cci *contextCachedItem
}
func _singletonWithType(vt reflect.Type) *singleton {
result := &singleton{
once: sync.NewOnce(),
lock: sync.NewMutex(),
option: Option{
lock: sync.NewMutex(),
},
}
result.cci = &contextCachedItem{}
result.cci._type = vt
result.obj = reflect.New(vt.Elem()).Interface()
result.cci.getter = func(ctx context.Context) any {
return result.getWithContext(ctx)
}
return result
}
func Singleton[T any]() *singleton {
return _singletonWithType(reflect.TypeOf((*T)(nil))).setType()
}
func NamedSingleton[T any](name string) *singleton {
return _singletonWithType(reflect.TypeOf((*T)(nil))).Name(name)
}
func (s *singleton) setType() *singleton {
_context.setByType(s.cci._type, s.cci)
return s
}
func (s *singleton) Name(name string) *singleton {
s.lock.Lock()
defer s.lock.Unlock()
name = strings.TrimSpace(name)
if len(name) == 0 {
panic("name must not be empty")
}
if len(s._name) == 0 {
_context.setByName(name, s.cci)
s._name = name
} else {
panic("name already set")
}
return s
}
func (s *singleton) WithOption(option *Option) *singleton {
s.lock.Lock()
defer s.lock.Unlock()
if option != nil {
s.option.lock.Lock()
defer s.option.lock.Unlock()
s.option.useConstructor = option.useConstructor
s.option.initMethodName = option.initMethodName
s.option.initParams = option.initParams
}
return s
}
func (s *singleton) SetInitFunc(initFunc func() any) *singleton {
s.lock.Lock()
defer s.lock.Unlock()
s.initFunc = initFunc
return s
}
func (s *singleton) UseConstructor(useConstructor bool) *singleton {
s.option.UseConstructor(useConstructor)
return s
}
func (s *singleton) InitMethodName(initMethodName string) *singleton {
s.option.InitMethodName(initMethodName)
return s
}
func (s *singleton) InitParams(initParams ...string) *singleton {
s.option.InitParams(initParams...)
return s
}
func (s *singleton) getWithContext(ctx context.Context) any {
timeout := getContextTimeout(ctx)
err := s.once.DoTimeout(timeout, func() error {
if s.initFunc != nil {
s.obj = s.initFunc()
} else {
s.obj = initWithOptionContext(s.obj, getNextTimeoutContext(ctx), &s.option)
}
return nil
})
if err != nil {
panic(fmt.Errorf("[%s]init singleton %s, timeout: %s err: %+v", time.Now(), s.cci._type.String(), timeout, err))
}
return s.obj
}
func Getter[T any](s *singleton) func() *T {
return func() *T {
return s.getWithContext(getTimeoutContext(Opts.Timeout)).(*T)
}
}