Understanding J2EE Components
You saw yesterday that modern software architecture design utilizes an n-tier model where each tier (or layer) implements one aspect of the overall solution. There are many ways to slice and dice the n-tier model, but the following list identifies the most common layers:
Presentation— The display of information back to the client
Application— Flow control logic for accessing and using the system
Business— Encapsulation of business rules
Data storage— Persistent data storage
Each layer is as loosely coupled as possible from the adjacent layers and should be completely unaware of any other layers. Put simply, a business logic component may have some knowledge of the application and data storage layers but no knowledge ...
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