July 2006
Intermediate to advanced
768 pages
16h 43m
English
Content preview from Agile Principles, Patterns, and Practices in C#
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23. Facade and Mediator
© Jennifer M. Kohnke
Symbolism erects a facade of respectability to hide the indecency of dreams.
—Mason Cooley
The two patterns discussed in this chapter have a common purpose: imposing some kind of policy on another group of objects. FACADE imposes policy from above; MEDIATOR, from below. The use of FACADE is visible and constraining; that of MEDIATOR, invisible and enabling.
Facade
The FACADE pattern is used when you want to provide a simple and specific interface onto a group of objects that have a complex and general interface. Consider, for example, DB.cs in Listing 34-9. This class imposes a very simple interface, ...
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