The code on the client side is fairly straightforward. The servlet only knows about the Directory interface, and all the code dealing with the data storage & retrieval is hidden behind that interface. The RMI service implementation, server.AddressBook is a simple example, using a HashMap to store the data. A more robust Directory implementation data would store its data in a database or LDAP server. For the servlet (RMI client), it doesn't matter where the data is coming from; it's happy as long as the service implementing the directory.Directory interface is available from the RMI registry.
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