J2EE™ and Beyond: Design, Develop, and Deploy World-Class Java™ Software

Using RMI Callbacks

Most remote object invocations use one-way invocation; the client obtains a remote object reference and makes calls on the methods of that remote reference. But sometimes it is convenient to provide two-way communication with a server object, allowing a client to make a call on a server object and having the server object respond to the client using a callback method. An efficient implementation of such a remote server would use internal multithreading to manage the clients. The following example demonstrates such an approach.

In this example we have a client application that would like to monitor orders as they are shipped. To implement this solution, we will register the client applications with the server to receive status ...