System Patterns - Applied Java Patterns - page 141

A Session component diagram for a client-matching session is shown in Figure 4.2 .
Figure 4.2. Session component for a client-matching session
A second Session component diagram, this time for server-maintained sessions, is shown in Figure 4.3 .
Figure 4.3. Session component for server-maintained sessions
A Session tracker diagram is shown in Figure 4.4 .
Figure 4.4. Session tracker
In this example, the client requester uses the server to perform a series of operations for updating contact
information in a shared address book. A user can perform four operations:
Add a contact
Add an address (associated with the current contact)
Remove an address (associated with the current contact)
Save the contact and address changes
These operations are defined in the class SessionClient .
Example 4.6 SessionClient.java
1. import java.net.MalformedURLException;
2. import java.rmi.Naming;