Beispiel #1
0
func getStateMachine() *transition.StateMachine {
	var orderStateMachine = transition.New(&Order{})

	orderStateMachine.Initial("draft")
	orderStateMachine.State("checkout")
	orderStateMachine.State("paid")
	orderStateMachine.State("processed")
	orderStateMachine.State("delivered")
	orderStateMachine.State("cancelled")
	orderStateMachine.State("paid_cancelled")

	orderStateMachine.Event("checkout").To("checkout").From("draft")
	orderStateMachine.Event("pay").To("paid").From("checkout")

	return orderStateMachine
}
Beispiel #2
0
	transition.Transition
}

func (order Order) Amount() (amount float32) {
	for _, orderItem := range order.OrderItems {
		amount += orderItem.Amount()
	}
	return
}

func (item OrderItem) Amount() float32 {
	return item.Price * float32(item.Quantity) * float32(100-item.DiscountRate) / 100
}

var (
	OrderState = transition.New(&Order{})
	ItemState  = transition.New(&OrderItem{})
)

func init() {
	// Define Order's States
	OrderState.Initial("draft")
	OrderState.State("checkout")
	OrderState.State("cancelled").Enter(func(value interface{}, tx *gorm.DB) error {
		tx.Model(value).UpdateColumn("cancelled_at", time.Now())
		return nil
	})
	OrderState.State("paid").Enter(func(value interface{}, tx *gorm.DB) error {
		// freeze stock, change items's state
		return nil
	})