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About: Non-virtual interface pattern     Goto   Sponge   NotDistinct   Permalink

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Type: yago:WikicatSoftwareDesignPatternsyago:Abstraction100002137yago:Cognition100023271yago:Form105930736yago:PsychologicalFeature100023100yago:Structure105726345 New Facet based on Instances of this Class

The non-virtual interface pattern (NVI) controls how methods in a base class are overridden. Such methods may be called by clients and overridable methods with core functionality. It is a pattern that is strongly related to the template method pattern. The NVI pattern recognizes the benefits of a non-abstract method invoking the subordinate abstract methods. This level of indirection allows for pre and post operations relative to the abstract operations both immediately and with future unforeseen changes. The NVI pattern can be deployed with very little software production and runtime cost. Many commercial software frameworks employ the NVI pattern.