https://vacua.dev/tags/interfaces/Recent content in Interfaces on Brian FaustHugoen-USMon, 01 Jan 0001 00:00:00 +0000https://vacua.dev/thoughts/the-type-a-caller-receives-defines-the-role/Sun, 01 Nov 2020 00:00:00 +0000https://vacua.dev/thoughts/the-type-a-caller-receives-defines-the-role/<p>A payment driver received a client through a factory. The factory promised a five-operation interface. The concrete client had nine additional public methods.</p> <p>Those extra methods covered token charging, status checks, settlement, cancellation, token management, payment-method lookup, and refund cancellation. None of the retained callers used them. When the transport was replaced, all nine disappeared along with more than a hundred lines of concrete client code.</p> <p>The driver did not change. Its interface did not change. Its factory interface did not change.</p>