Application Servers
The application server was not entirely a new concept—just an old one rehashed from other, not so popular, architectures. An application server environment is typically implemented using three different tiers: presentation, business logic, and persistence (see Figure 21.2). These tiers have specific responsibilities, and seldom do the lines of these responsibilities blur.
Figure 21.2. Sample implementation of an application server based on three-tiered architecture.
In this environment, the client usually executes business methods on the application server and uses the server mostly for persistence and enforcing data integrity. ...
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