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Is Eventbus more a Mediator or an Observer? According to Google,
“eventbus mediator” gets 2.430 hits and
“eventbus observer” gets 3.850 hits.
From the description, they would both match what I was trying to do (the mediator even a little more).
So does eventbus implement a specific pattern or is it up to me which I say it is?
Often, a given piece of code isn’t intrinsically an example of one pattern or another. This is why they’re called “patterns” (rather than, say, “implementation techniques”). A lot of software kinda looks like one pattern, but also resembles another — this is good. It’s best not to adhere to patterns for patterns’ sake, but to use them as a shared vocabulary for discussing architecture.
EventBus is one such tool. I wrote it with Observer-like situations in mind, but if you structure your application appropriately it can play a Mediator-like role.