Using an exposed domain model - POJOs in Action: Developing Enterprise Applications with Lightweight Frameworks - page 302

Retrying transactions
Transactions that are rolled back because of a recoverable error such as an optimis-
tic locking failure should be retried. A convenient way to automatically retry a trans-
action is to use an AOP interceptor that catches exceptions that indicate recoverable
errors and then retries the transaction. Figure 8.7 shows what happens when a trans-
action is retried. In this design, the PlaceOrderService is wrapped with the Trans-
actionRetryInterceptor , which is a custom AOP interceptor that is described in
more detail in chapter 12, and the regular Spring TransactionInterceptor .

: Transaction
RetryInterceptor

: Transaction
I nterceptor

: PlaceOrder
Service

: Persistence
Framework

: Servlet

service()

updateDeliveryInfo()

updateDeliveryInfo()

beginTxn()

serviceMethod()

rollbackTxn()

updateDeliveryInfo( )

beginTxn()

serviceMethod()

commitTxn()

Figure 8.7 Retrying a transaction with an AOP interceptor