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So far in our 5 part series we've dug into the details of Events, Dispatchers, and Providers. An awful lot of flexibility can be had from just three simple methods. But how does it work out in practice?

In today's installment I want to start showing examples of real-world (ish) use cases that can benefit from this design. For these examples I will be using Tukio, my stand-alone PSR-14 implementation, but all will work just as well with any PSR-14 implementation, by design.

Voting based access control

A common "extension point" in many systems is access control, especially in a configurable CMS. You want to limit access to various operations, but which users should have access to what operations could vary based on a wide variety of special-case conditions that you want to allow individual site owners to control.