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We now illustrate the joinpoint-introspection mechanism with a third version of the trace aspect, which is named TraceAspect3. In comparison to TraceAspect2, TraceAspect3 now displays the following for each joinpoint: The name of the intercepted method call The parameters of the call The current object in other words, the calling object The target object in other words, the called object The code of the TraceAspect3 aspect that performs this introspection and displays these four pieces of information is shown in Listing 3-8.

public class MessageBean implements MessageDrivenBean, MessageListener { private MessageDrivenContext ctx; public void ejbRemove() { } public void ejbPassivate() { }

To recap from chapter 5, in such cases the message is acknowledged as soon as it is successfully delivered and the MDB has no capability or apparent need to support rolling back message delivery NEVER In a CMT, NEVER really means never In other words, this attribute means that the EJB method can never be invoked from a transactional client If such an attempt is made, a javaxejbEJBException is thrown This is probably the least-used transaction attribute value It could be used if your method is changing a nontransactional resource (such as a text file) and you want to make sure the client knows about the nontransactional nature of the method..

Transaction attributes and MDBs As we mentioned in chapter 4, MDBs don t support all of the six transaction attributes we just discussed. Although you can apply any of the attributes to a stateful or stateless session bean, MDBs only support the REQUIRED and NOT_SUPPORTED attributes. This relates to the fact that no client ever invokes MDB methods directly; it is the container that invokes MDB methods when it receives an incoming message. Since there is no existing client transaction to suspend or join, REQUIRES_NEW, SUPPORTS, and MANDATORY make no sense (refer to table 6.2). NEVER makes no sense either, since we don t need that strong a guard against the container. In effect, depending on message acknowledgment on method return, we need only tell the container of two conditions: we need a transaction (REQUIRED) that encapsulates the message listener method, or we do not need transaction support (NOT_SUPPORTED). So far, we ve taken a detailed look at how transactions are created and managed by the container. We know that the successful return of a CMT method causes the container to commit a method or at least not roll it back if it is a joined transaction. We ve explained how a CMT method can mark an available transaction as rolled back, but we ve not yet discussed the actual mechanics. Let s dig into the underpinnings next.

public void setMessageDrivenContext(MessageDrivenContext ctx) { this.ctx = ctx; } public void ejbCreate () throws CreateException { public void ejbActivate() { } }

6.2.4 Marking a CMT for rollback If the appropriate business conditions arise, a CMT method can ask the container to roll back a transaction as soon as possible. The important thing to note here is that the transaction is not rolled back immediately, but a flag is set for the container to do the actual rollback when it is time to end the transaction. Let s go back to a snippet of our scenario in listing 6.1 to see exactly how this is done:

Listing 3-8. An AspectJ Program for Joinpoint Introspection package aop.aspectj; public aspect TraceAspect3 { pointcut toBeTraced(): call(* aop.aspectj.Order.*(..)); Object around(): toBeTraced() { String methodName = thisJoinPoint.getSignature().getName(); Object[] args = thisJoinPoint.getArgs(); Object caller = thisJoinPoint.getThis(); Object callee = thisJoinPoint.getTarget(); System.out.println("-> Method "+methodName+" begins"); System.out.print("-> "+args.length+" parameter(s) "); for (int i = 0; i < args.length; i++) System.out.print( args[i]+" " ); System.out.println(); System.out.println("-> "+caller+" to "+callee); Object ret = proceed(); System.out.println("<- Method "+methodName+"ends"); return ret; } } The output of the order-management application with the TraceAspect3 aspect is shown in Listing 3-9. Before each call to a method from class Order, three lines display respectively: the name of the called method, the parameters of the call, and the caller and the called object. Listing 3-9. The Output of the AspectJ Program for Joinpoint Introspection -> Method addItem begins -> 2 parameter(s) CD 2 -> aop.aspectj.Customer@1cd2e5f to aop.aspectj.Order@19f953d 2 item(s) CD added to the order -> Method addItem ends -> Method addItem begins -> 2 parameter(s) DVD 1 -> aop.aspectj.Customer@1cd2e5f to aop.aspectj.Order@19f953d 1 item(s) DVD added to the order -> Method addItem ends -> Method computeAmount begins -> 0 parameter(s) -> aop.aspectj.Customer@1cd2e5f to aop.aspectj.Order@19f953d -> Method computeAmount ends Order amount: US$50.0

@Resource private SessionContext context; ... public void placeSnagItOrder(Item item, Customer customer){ try { ... validateCredit(customer); ... } catch (CreditValidationException cve) { context.setRollbackOnly(); ...