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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