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As shown in listing 2.5, the container looks up the JMS resources specified through the name parameter and injects them into the connectionFactory and billingQueue instance variables. The name parameter values specify what resources are bound to the EJB s environment naming context. Then the PlaceOrderBean establishes a connection to the JMS provider, and creates a session and a message producer C. Secondly, it is important to realize that the MessageProducer.send method D doesn t wait for a receiver to receive the message on the other end. Because the messaging server guarantees that the message will be delivered to anyone interested in the message, this is just fine. In fact, this is exactly what enables the billing process to start in parallel to the ordering process, which continues on its merry way as soon as the message is sent. You should also note how loosely coupled the ordering and billing processes are. The ordering bean doesn t even know who picks up and processes its message; it simply knows the message destination! Finally, PlaceOrderBean cleans up all resources used by it E. As we know from our solution schematic in section 2.2, the OrderBillingMDB processes the request to bill the order. It continuously listens for messages sent to the jms/OrderBillingQueue messaging destination, picks up the messages from the queue, inspects the Order object embedded in the message, and attempts to bill the user. We ll depict this scheme in figure 2.6 to reinforce the concept.

Figure 2.6 Asynchronously billing orders using MDBs. The stateful session bean processing the order sends a message to the order-billing queue. The billing MDB picks up this message and processes it asynchronously.

The OrderBillingMDB s sole purpose is to attempt to bill the bidder for the total cost of an order, including the price of the items in the order, shipping, handling, insurance costs, and the like. Listing 2.6 shows the abbreviated code for the order billing MDB. Recall that the Order object passed inside the message sent by the PlaceOrder EJB contains a BillingInfo object. The BillingInfo object tells OrderBillingMDB how to bill the customer perhaps by charging a credit card or

Note The Configuration Editor provides helpful configuration support for several of the WS- specifications, as you can tell from the additional tabs in Figure 5-3. We will discuss the additional support that the Configuration Editor provides in the relevant chapters.

crediting against an online bank account. However the user is supposed to be charged, after attempting to bill the user the MDB notifies both the bidder and seller of the results of the billing attempt. If billing is successful, the seller ships to the address specified in the order. If the billing attempt fails, the bidder must correct and resubmit the billing information attached to the order. Last but not least, the MDB must also update the order record to reflect what happened during the billing attempt. Feel free to explore the complete code sample and deployment descriptor entries containing the JMS resource configuration in the zip containing code examples.

In addition to exception-safe resource management, managed wrapper libraries must also care about mapping C++ exceptions thrown by the native library to managed exceptions. For example, let s assume that the SampleCipher algorithm supports only 128-bit and 256-bit key sizes. The constructor of NativeLib::SampleCipher could throw a NativeLib::CipherException when a key of the wrong size is passed. As discussed in 9, C++ exceptions are mapped to System::Runtime::InteropServices::SEHExceptions, which are not useful for the user of a wrapper library. Therefore it is necessary to catch native exceptions and rethrow managed exceptions with equivalent information. To map exceptions in constructors, the function-try block can be used as shown in the following code. As discussed in 6, this allows you to catch exceptions thrown during member initialization as well as exceptions thrown in the constructor s body. SampleCipher::SampleCipher(array<Byte>^ key) try : pKey(0), pWrappedObject(0) { ..// same implementation as before } catch(NativeLib::CipherException& ex) { throw gcnew CipherException(gcnew String(ex.what())); }

package ejb3inaction.example.buslogic; import import import import import import import javax.ejb.MessageDriven; javax.ejb.ActivationConfigProperty; javax.jms.Message; javax.jms.MessageListener; javax.jms.ObjectMessage; ejb3inaction.example.persistence.Order; ejb3inaction.example.persistence.OrderStatus;

Marks POJO as MDB @MessageDriven( activationConfig = { Specifies JMS @ActivationConfigProperty( destination to get propertyName="destinationName", messages from propertyValue="jms/OrderBillingQueue") } ) public class OrderBillingMDB implements MessageListener { ... Implements javax.jms. public void onMessage(Message message) { MessageListener interface try { ObjectMessage objectMessage = (ObjectMessage) message; Order order = (Order) objectMessage.getObject();

try { bill(order); notifyBillingSuccess(order); order.setStatus(OrderStatus.COMPLETE); } catch (BillingException be) { notifyBillingFailure(be, order); order.setStatus(OrderStatus.BILLING_FAILED); } finally { update(order); }

Even though no exceptions are expected from the member initialization list in the preceding code, it uses a function-try block. This ensures that exceptions are caught when you extend the member initialization by adding a member variable to the class or by deriving SampleCipher from another class.

} catch (Exception e) { e.printStackTrace(); } } ... }