Encapsulating the business logic with a POJO façade - POJOs in Action: Developing Enterprise Applications with Lightweight Frameworks - page 246

Presentation Tier

POJO Façade

Spring TransactionInterceptor

<<interface>>
PlaceOrderFacade

updateDeliveryInfo()
updateRestaurant()
...

PlaceOrderFacadeImpl

updateDeliveryInfo()
updateRestaurant()
...

Domain Model

<<interface>>
PlaceOrderService

updateDeliveryInfo()
updateRestaurant()
...

PendingOrder

Restaurant
Repository

Restaurant

Figure 7.1 The structure of a typical POJO façade

The POJO façade consists of the following types:

PlaceOrderFacade is the interface that specifies the methods that can be
called by the presentation tier.

■

PlaceOrderFacadeImpl implements the PlaceOrderFacade interface by call-
ing the PlaceOrderService and other domain objects such as Restaurant-
Repository

■

Spring TransactionInterceptor is an AOP interceptor that manages trans-
actions and persistence framework connections.

■