Mapping handler to events
RailsEventStore client provides an API that helps you find all subscribers (also called event handlers) for specified event type.
This method is also useful when you have to answer the question if the handler subscribed to an event properly.
Use following method to find all handlers for event of specific type.
event_store.subscribers_for(AccountUpdated) # => [...]
This method returns array of all subscribers that subscribe to specified type of event.