23.5. Conclusion of the External Services with Varying Interfaces Problem
A combination of Adapter, Factory, and Singleton patterns have been used to provide Protected Variations from the varying interfaces of external tax calculators, accounting systems, and so forth. Figure 23.7 illustrates a larger context of using these in the use-case realization.
Figure 23.7. Adapter, Factory, and Singleton patterns applied to the design.
This design may not be ideal, and there is always room for improvement. But one of the goals strived for in this case study is to illustrate that at least a design can be constructed from a set of principles or pattern ...
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