I have an abstract class that's following the singleton pattern, then I have a few concrete classes that extend it:
At startup, based on the current system, I'm setting a concrete instance as the instance of the singleton like this:
LicenseFactory.setInstance(new SystemALicenseFactory())
With that, at any point in the code, I can consume the abstract method like this: LicenseFactory.getInstance().isUserValid()
Because my concrete classes aren't creating a product, I'm not sure whether I can call this the Abstract Factory pattern or something else. Is it common to use a pattern like this, and is there anything I should have done better?
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