B
Bronco
Guest
I guess that the line is where a concrete application calls generic functionality. For example, you have a CachingManager class, and this CachingManager is programmed against the ICaching interface. The implementation of ICaching is injected. So this could be a DbCaching class or a MemoryCaching class or whatever caching you can come up with.The concrete implementation of ICaching is injected into the CachingManager by the application which uses the CachingManager (iow: who has the need for caching). This is sound because the application (read: the programmer) should know on the application level which type of cache works best at the particular situation. As far as instantiation goes, the application could bluntly istantiate a cache type (class) and inject it or instantiate it via a factory which get it's information from a configuration file (in which case the used caching strategy is externalized). I hope this makes sense.
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