11.3. Migration to EJB: First Steps
As a first step in the migration to the EJB component model, one of the simpler CBOs was re-implemented as an EJB component.
The Currency CBO was chosen because it is a self-contained bean with a simple interface, without dependencies on other parts of EDH, and is based on a single table.
The Currency CBO is defined according to Figure 11.5
Figure 11.5. The Currency Business Object Interface
All the CBOs are defined as interfaces with an underlying implementation class. It was designed this way so that the implementation could be replaced at a later date, without having to change any client code.
The Currency ...
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