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Inversion of Control
Inversion of control goes back to a very old idea where in the mid seventies, if you were writing an application on the eunich system that needed to handle multiple different connections. And so it's inverted in the sense that rather than expressing your code, as i want to do, one damned thing after another, you essentially write it in terms of event handler. We don't take advantage of using multiple threads because we still have to process every message one at a time. The testability story talked about race conditions and how they are easy to simulate. That is purely because you are able to control precisely what goes into the system and when to pause,. To start looking to examine the