(Информация о версии неизвестна, возможно, только в SVN)
Yaf_Dispatcher purpose is to initialize the request environment, route the incoming request, and then dispatch any discovered actions; it aggregates any responses and returns them when the process is complete.
Yaf_Dispatcher also implements the Singleton pattern, meaning only a single instance of it may be available at any given time. This allows it to also act as a registry on which the other objects in the dispatch process may draw.