question: synchronized public static void unregisterAll ( final Class < ? extends EventBusListener > listenerClass ) { for ( final List < EventBusListener > list : map . values ( ) ) { for ( final EventBusListener listener : list ) { if ( listenerClass . isAssignableFrom ( listener . getClass ( ) ) ) { list . remove ( listener ) ; } } } }
target:  Removes all listener of the specified class from all events.