Method RegisterSingleton

component/container.go:195–214

RegisterSingleton registers a singleton instance with the given name. Returns an error if a singleton with the same name already exists.

(name string, instance any)

// RegisterSingleton registers a singleton instance with the given name.
// Returns an error if a singleton with the same name already exists.
func (d *DefaultContainer) RegisterSingleton(name string, instance any) error {
	if name == "" {
		return errors.New("empty name")
	}

	if instance == nil {
		return errors.New("nil instance")
	}

	d.muSingletons.Lock()
	defer d.muSingletons.Unlock()

	if _, exists := d.singletons[name]; exists {
		return ErrInstanceAlreadyExists
	}

	d.singletons[name] = instance
	d.typesOfSingletons[name] = reflect.TypeOf(instance)
	return nil
}

// ContainsSingleton checks whether a singleton with the specified name exists.
func (d *DefaultContainer) ContainsSingleton(name string) bool {