Using the Transaction Script pattern - POJOs in Action: Developing Enterprise Applications with Lightweight Frameworks - page 334

B Finds or creates
pending order

PendingOrderDTO pendingOrder =
findOrCreatePendingOrder(pendingOrderId);

Calendar earliestDeliveryTime = Calendar
.getInstance();
earliestDeliveryTime
.add(Calendar.HOUR, 1);

C Checks
delivery time

if (deliveryTime
.before(earliestDeliveryTime
.getTime())) {
return new UpdateDeliveryInfoResult(
UpdateDeliveryInfoResult.
bbbbbb b ➥ INVALID_DELIVERY_INFO,
pendingOrder, null);
}

List availableRestaurants =
restaurantDAO
.findAvailableRestaurants(
deliveryAddress, deliveryTime);
if (availableRestaurants.isEmpty()) {
return new UpdateDeliveryInfoResult (
UpdateDeliveryInfoResult.
bbbbbbb b ➥ NO_RESTAURANT_AVAILABLE,
pendingOrder, null);
}
pendingOrder
.setDeliveryAddress(deliveryAddress);
pendingOrder
.setDeliveryTime(deliveryTime);
pendingOrder
.setState(PendingOrder.
bbbbbbbb b ➥ DELIVERY_INFO_SPECIFIED);
pendingOrderDAO
.savePendingOrder(pendingOrder);
return new UpdateDeliveryInfoResult(
UpdateDeliveryInfoResult.
bbbbbb ➥ SELECT_RESTAURANT,
pendingOrder,
availableRestaurants);
}

D Finds available
restaurants

E Returns error code
if there are none

F Updates
PendingOrderDTO

G Saves PendingOrderDTO
back to database

H Creates
result object

private PendingOrderDTO findOrCreatePendingOrder(
String pendingOrderId) {
if (pendingOrderId == null)