By Kevin Mukhar; Chris Zelenak
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Extra info for Beginning Java EE 5
The same registry service is used by the client application, which requests a named object from the registry. Once it receives a local reference to the remote object, it can call the methods of the object; however, rather than executing the method on the client’s computer, the method call is passed across the network and executed on the machine where the remote object resides. What RMI provides is a bare-bones client/server implementation. It provides the basic stuff: a registry for lookup, the guts of network communication for invoking operations and passing parameters to and from remote objects, and a basic mechanism for managing access to system resources as a safeguard against malicious code running on a remote computer.
One example of using a message queue is an automated stock trading system. Stock prices are sent as messages to a message queue, and components that are interested in stock prices consume those messages. With messagedriven EJBs, it is possible to create an EJB that responds to messages concerning stock prices and makes automatic trading decisions based on those messages. Figure 1-13. A message queue allows senders and receivers of messages to remain unaware of each other. Senders of messages can send the message to a queue, knowing that something will get the message, but not knowing exactly what receives the message or when it will be received.
When you deploy an EJB to an application server, the EJB is associated with a name in a registry. Clients can look up the EJB in the registry, and then remotely call the methods of the EJB. Since the EJB container provides all of the enterprise plumbing, you get to spend more time building your application and less time messing around with trying to shoehorn in services like security and transaction support. EJBs come in a few different flavors: session beans, entity beans, and message beans. Session beans, as the name implies, live only as long as the conversation, or session, between the client application and the bean lasts.