Method Resolve

component/container.go:296–345

Resolve retrieves a component instance by its name.

(ctx context.Context, name string)

// Resolve retrieves a component instance by its name.
func (d *DefaultContainer) Resolve(ctx context.Context, name string) (any, error) {
	if name == "" {
		return nil, errors.New("empty name")
	}

	ctx = withCreationState(ctx)

	candidate, ok := d.Singleton(name)
	if ok {
		return candidate, nil
	}

	def, defExists := d.Definition(name)
	if !defExists {
		return nil, ErrDefinitionNotFound
	}

	state := creationStateFromContext(ctx)

	if def.IsSingleton() {
		return d.createSingleton(ctx, def)
	} else if def.IsPrototype() {
		defer state.removeFromPreparation(name)
		if err := state.putToPreparation(name); err != nil {
			return nil, err
		}

		instance, err := d.createInstance(ctx, def)

		if err != nil {
			return nil, err
		}

		return instance, nil
	}

	scope, scopeExists := d.Scope(def.Scope())
	if !scopeExists {
		return nil, ErrScopeNotFound
	}

	return scope.Resolve(ctx, name, func(ctx context.Context) (any, error) {
		defer state.removeFromPreparation(name)
		if err := state.putToPreparation(name); err != nil {
			return nil, err
		}

		return d.createInstance(ctx, def)
	})
}

// ResolveType retrieves an instance of the specified type.
func (d *DefaultContainer) ResolveType(ctx context.Context, typ reflect.Type) (any, error) {