in what situation should we use eventbus directly?
if we do not need use it directly,then i think the design of the
structure of the map object in eventBus is too complex:
Map<Event.Type<?>, Map<Object, List<?>>>
actually,if we design it as Map<Event.Type<?>, List<?>>,then it can
satisfy the requirement of eventManger.because the "Object" key is
assigned with null in eventManager.
sorry for my poor english ..

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