||Implementation of EventInterface.
||A dispatcher delegating its methods to an other dispatcher.
||Implementation of a DispatcherInterface supporting prioritized listeners.
||Default Event class.
||Implementation of an immutable Event. An immutable event cannot be modified
after instanciation :
||A class containing an inner listeners priority queue that can be iterated
multiple times. One instance of ListenersPriorityQueue is used per Event in the
||An enumeration of priorities for event listeners, that you are encouraged to use
when adding them in the Dispatcher.