Guava EventBus dispatching

Question

I\'m using Guava\'s EventBus to kick off some processing and report results. Here\'s a very simple compilable example:

import com.google.common.eventbus.EventBu         


        

Answer 1

I try to summarize Guava's EventBus event delivery behaviour:

If an event E1 is posted at moment t1, all subscribers are notified. If one of the subscribers posts an event itself in it's @Subscribe-method (a tiny moment later), the "new" event E2 is enqueued and delivered afterwards. Afterwards means here: after all @Subscribe-methods for E1 from t1 did return.

Compare this kind of "cascaded" event posting to breadth first tree traversal.

It seems to be the explicit choosen design of EventBus.