8.5. ShipOrder Message-Driven Bean

Asynchronous messages are useful for instigating tasks that take a long time to complete. The sender doesn't have to wait for a message to be delivered or for a receiver to carry out the subsequent request. Furthermore, loose coupling between senders and receivers makes systems more flexible as requirements change.

In this section we'll show you a JMS client producer that uses PTP messaging to interact with our online Music Collection Order processing system. This client, OrderApp, sends a message to a ShipOrder message-driven bean (ShipOrderBean). Upon receipt, the message-driven bean invokes a business method (shipOrdersByDate()) in our CustomerSession EJB. Recall that this method ships all orders with an ...

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