Database transactions and concurrency - POJOs in Action: Developing Enterprise Applications with Lightweight Frameworks - page 473

■ Scheduler , which periodically calls DomainRestaurantNotificationService
■ DomainRestaurantNotificationService , the domain model-based imple-
mentation of the RestaurantNotificationService
■ TransactionInterceptor , the Spring AOP interceptor that manages transac-
tions and the Hibernate Session or JDO PersistenceManager
■ Order , which represents an order and defines a noteSent() method that
updates the order with the notification details
■ RestaurantNotificationGateway , which sends the order to the restaurant
■ NotificationDetails , which contains a messageId and timeSent

OrderRepository , which uses the JDO or Hibernate query API s to find the
orders that are waiting to be sent to the restaurants.

■

Scheduler

TransactionInterceptor

Domain
RestaurantNotification
Service

<<interface>>
RestaurantNotification
Service

sendOrders()

void sendOrders()

<<interface>>
RestaurantGateway

<<interface>>
OrderRepository

sendOrder(Order)

List findOrdersToSend()

Order

JDO
OrderRepository

Hibernate
OrderRepository

noteSent(messageId, timeSent)

javax.jdo org.hibernate

Figure 12.6 Domain model version of the business logic for the Send Orders to Restaurant use case