I have this project that looks like the JDO API. The API defines very complex object that have relatively simple interfaces (those complex objects manage a storage source like a DB and simply provide CRUD access). Now I want those objects to be created through a Singleton Factory that accepts an ‘order’ object, which looks like Command Pattern. The problem is that every order should map to exactly one implementation/concrete product… But in this project should be only be the API. Other project I or other API users make should be able to add their implementations to the factory mapping.
I could solve this using Reflection, but I think Reflection is not actually a well designed solution to this problem. I also think Reflection is much harder to implement.
What would be a good way to implement this? I am thinking of some configuration file and the start of the program simply adding some entries to some map the factory has.
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